add countdown settings

Readme.md

@@ -6,14 +6,24 @@ by SN74HC595 shift registers.
 ## Hardware
 Connect the shift registers like this, or adapt the pin config as needed:
 
-- Data input (DIO) to ESP GPIO19
-- Shift clock input (SCK) to ESP GPIO18
-- Latch / register clock input (RCK) to ESP GPIO5
+- Data input (DIO) to ESP:
+  - GPIO23 (first display), 
+  - GPIO19 (second display), 
+  - GPIO22 (third display),
+  - GPIO21 (fourth display)
+- Shift clock input (SCK) to ESP GPIO18 (all displays)
+- Latch / register clock input (RCK) to ESP GPIO5 (all display)
 
-Keep in mind that the ESP32 is a 3.3V device when connecting to a 5V display.
+Keep in mind that the ESP32 is a 3.3V device when connecting to a 5V display. The shift registers should handle the 3.3V
+signals from the ESP, annd in some cases, 3.3V can also be used to power the displays at a lower brightness.
 
 
 ## Setup
+
+> Note: the QSPI driver in esphome is (as of 2024-01-28) not yet in the released package.
+> Install a suitable version directly from github with:
+> `pip install "esphome @ git+https://github.com/esphome/esphome@1fef769496ed89c0062d8e70f5964b8318ba4550"`
+
 Set the board type in the YAML (default should also work on most ESP32 devices)
 Adapt the config as needed for the fallback AP and if wanted, api key.
 Create a `secrets.yaml` containing this:
@@ -35,4 +45,4 @@ The driver in `components/` is directly based on the existing MAX7219 driver in
 subject to the GPLv3 and MIT licenses, as outlined in the LICENSE document (also copied from ESPHome).
 
 ## Open Issues
-The actual segment mapping is not tested well, due to missing hardware.
+

components/qspi_74hc595_4x_display/display.py

@@ -0,0 +1,34 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components import display, spi
+from esphome.const import CONF_ID, CONF_INTENSITY, CONF_LAMBDA, CONF_NUM_CHIPS
+
+DEPENDENCIES = ["spi"]
+
+qspi_74hc595_4x_display_ns = cg.esphome_ns.namespace("qspi_74hc595_4x_display")
+QSPI_74HC595_4X_DISPLAYComponent = qspi_74hc595_4x_display_ns.class_(
+    "QSPI_74HC595_4X_DISPLAYComponent", cg.PollingComponent, spi.SPIDevice
+)
+QSPI_74HC595_4X_DISPLAYComponentRef = QSPI_74HC595_4X_DISPLAYComponent.operator("ref")
+
+CONFIG_SCHEMA = (
+    display.BASIC_DISPLAY_SCHEMA.extend(
+        {
+            cv.GenerateID(): cv.declare_id(QSPI_74HC595_4X_DISPLAYComponent),
+        }
+    )
+    .extend(cv.polling_component_schema("1s"))
+    .extend(spi.spi_device_schema(quad=True))
+)
+
+
+async def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    await spi.register_spi_device(var, config)
+    await display.register_display(var, config)
+
+    if CONF_LAMBDA in config:
+        lambda_ = await cg.process_lambda(
+            config[CONF_LAMBDA], [(QSPI_74HC595_4X_DISPLAYComponentRef, "it")], return_type=cg.void
+        )
+        cg.add(var.set_writer(lambda_))

components/qspi_74hc595_4x_display/qspi_74hc595_4x_display.cpp

@@ -0,0 +1,265 @@
+#include "qspi_74hc595_4x_display.h"
+#include "esphome/core/hal.h"
+#include "esphome/core/helpers.h"
+#include "esphome/core/log.h"
+
+namespace esphome
+{
+namespace qspi_74hc595_4x_display
+{
+
+static const char *const TAG = "qspi_74hc595_4x_display";
+
+static const uint32_t QSPI_74HC595_4X_DISPLAY_UNKNOWN_CHAR = 0x11111111;
+
+static const uint32_t QSPI_74HC595_4X_DISPLAY_ASCII_TO_RAW[95] = {
+    // BADCFE.G
+    //  0xBADCFE.G
+    0x00000000,                           // ' ', ord 0x20
+    0x10010010,                           // '!', ord 0x21
+    0x10001000,                           // '"', ord 0x22
+    0x10011100,                           // '#', ord 0x23
+    0x01111000,                           // '$', ord 0x24
+    0x01100001,                           // '%', ord 0x25
+    0x11100100,                           // '&', ord 0x26
+    0x00001000,                           // ''', ord 0x27
+    0x01101100,                           // '(', ord 0x28
+    0x11110000,                           // ')', ord 0x29
+    0x01000000,                           // '*', ord 0x2A
+    0x00000100,                           // '+', ord 0x2B
+    0x00010000,                           // ',', ord 0x2C
+    0x00000001,                           // '-', ord 0x2D
+    0x00000010,                           // '.', ord 0x2E
+    0x10000101,                           // '/', ord 0x2F
+    0x11111100,                           // '0', ord 0x30
+    0x10010000,                           // '1', ord 0x31
+    0x11100101,                           // '2', ord 0x32
+    0x11110001,                           // '3', ord 0x33
+    0x10011001,                           // '4', ord 0x34
+    0x01111001,                           // '5', ord 0x35
+    0x01111101,                           // '6', ord 0x36
+    0x11010000,                           // '7', ord 0x37
+    0x11111101,                           // '8', ord 0x38
+    0x11111001,                           // '9', ord 0x39
+    0x01100000,                           // ':', ord 0x3A
+    0x01110000,                           // ';', ord 0x3B
+    0x00100100,                           // '<', ord 0x3C
+    0x00100001,                           // '=', ord 0x3D
+    0x00110000,                           // '>', ord 0x3E
+    0x11000101,                           // '?', ord 0x3F
+    0x11101101,                           // '@', ord 0x40
+    0x11011101,                           // 'A', ord 0x41
+    0x00111101,                           // 'B', ord 0x42
+    0x01101100,                           // 'C', ord 0x43
+    0x10110101,                           // 'D', ord 0x44
+    0x01101101,                           // 'E', ord 0x45
+    0x01001101,                           // 'F', ord 0x46
+    0x01111100,                           // 'G', ord 0x47
+    0x10011101,                           // 'H', ord 0x48
+    0x10010000,                           // 'I', ord 0x49
+    0x10110100,                           // 'J', ord 0x4A
+    QSPI_74HC595_4X_DISPLAY_UNKNOWN_CHAR, // 'K', ord 0x4B
+    0x00101100,                           // 'L', ord 0x4C
+    0x11011100,                           // 'M', ord 0x4D
+    0x00010101,                           // 'N', ord 0x4E
+    0x11111100,                           // 'O', ord 0x4F
+    0x11001101,                           // 'P', ord 0x50
+    0x11111110,                           // 'Q', ord 0x51
+    0x00000101,                           // 'R', ord 0x52
+    0x01111001,                           // 'S', ord 0x53
+    0x00001101,                           // 'T', ord 0x54
+    0x10111100,                           // 'U', ord 0x55
+    0x10111100,                           // 'V', ord 0x56
+    0x10111101,                           // 'W', ord 0x57
+    QSPI_74HC595_4X_DISPLAY_UNKNOWN_CHAR, // 'X', ord 0x58
+    0x10001101,                           // 'Y', ord 0x59
+    0x11100101,                           // 'Z', ord 0x5A
+    0x01101100,                           // '[', ord 0x5B
+    0x00011001,                           // '\', ord 0x5C
+    0x11110000,                           // ']', ord 0x5D
+    0x11001000,                           // '^', ord 0x5E
+    0x00100000,                           // '_', ord 0x5F
+    0x10000000,                           // '`', ord 0x60
+    0x11011101,                           // 'a', ord 0x61
+    0x00111101,                           // 'b', ord 0x62
+    0x00100101,                           // 'c', ord 0x63
+    0x10110101,                           // 'd', ord 0x64
+    0x01101101,                           // 'e', ord 0x65
+    0x01001101,                           // 'f', ord 0x66
+    0x01111100,                           // 'g', ord 0x67
+    0x00011101,                           // 'h', ord 0x68
+    0x00010000,                           // 'i', ord 0x69
+    0x10110100,                           // 'j', ord 0x6A
+    QSPI_74HC595_4X_DISPLAY_UNKNOWN_CHAR, // 'k', ord 0x6B
+    0x00101100,                           // 'l', ord 0x6C
+    0x11011100,                           // 'm', ord 0x6D
+    0x00010101,                           // 'n', ord 0x6E
+    0x00110101,                           // 'o', ord 0x6F
+    0x11001101,                           // 'p', ord 0x70
+    0x11011001,                           // 'q', ord 0x71
+    0x00000101,                           // 'r', ord 0x72
+    0x01111001,                           // 's', ord 0x73
+    0x00001101,                           // 't', ord 0x74
+    0x00110100,                           // 'u', ord 0x75
+    0x00110100,                           // 'v', ord 0x76
+    QSPI_74HC595_4X_DISPLAY_UNKNOWN_CHAR, // 'w', ord 0x77
+    QSPI_74HC595_4X_DISPLAY_UNKNOWN_CHAR, // 'x', ord 0x78
+    0x10001101,                           // 'y', ord 0x79
+    QSPI_74HC595_4X_DISPLAY_UNKNOWN_CHAR, // 'z', ord 0x7A
+    0x10010001,                           // '{', ord 0x7B
+    0x00001100,                           // '|', ord 0x7C
+    0x00001101,                           // '}', ord 0x7D
+    0x11001001,                           // '~', ord 0x7E (degree symbol)
+};
+
+static constexpr uint8_t QSPI_74HC595_4X_DISPLAY_DIGIT_MAP[8] = {2, 3, 0, 1, 6, 7, 4, 5};
+
+static constexpr uint8_t QSPI_74HC595_4X_DISPLAY_ZEROS[32] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+                                                              0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+
+float QSPI_74HC595_4X_DISPLAYComponent::get_setup_priority() const
+{
+    return setup_priority::PROCESSOR;
+}
+
+void QSPI_74HC595_4X_DISPLAYComponent::setup()
+{
+    ESP_LOGCONFIG(TAG, "Setting up QSPI_74HC595_4X_DISPLAY...");
+    this->spi_setup();
+    memset(this->buffer_, 0xff, sizeof(this->buffer_));
+    // this->buffer_[0*2] = ~QSPI_74HC595_4X_DISPLAY_ASCII_TO_RAW['.'-' '];
+    // this->buffer_[1*2] = ~QSPI_74HC595_4X_DISPLAY_ASCII_TO_RAW['*'-' '];
+    // this->buffer_[2*2] = ~QSPI_74HC595_4X_DISPLAY_ASCII_TO_RAW['`'-' '];
+    // this->buffer_[3*2] = ~QSPI_74HC595_4X_DISPLAY_ASCII_TO_RAW[','-' '];
+    // this->buffer_[4*2] = ~QSPI_74HC595_4X_DISPLAY_ASCII_TO_RAW['_'-' '];
+    // this->buffer_[5*2] = ~QSPI_74HC595_4X_DISPLAY_ASCII_TO_RAW['+'-' '];
+    // this->buffer_[6*2] = ~QSPI_74HC595_4X_DISPLAY_ASCII_TO_RAW['\''-' '];
+    // this->buffer_[7*2] = ~QSPI_74HC595_4X_DISPLAY_ASCII_TO_RAW['-'-' '];
+    for (uint8_t i = 0; i < 8; i++)
+    {
+        this->buffer_[(i * 2) + 1] = 0xF << (QSPI_74HC595_4X_DISPLAY_DIGIT_MAP[i] * 4);
+    }
+}
+
+void QSPI_74HC595_4X_DISPLAYComponent::dump_config()
+{
+    ESP_LOGCONFIG(TAG, "QSPI_74HC595_4X_DISPLAY:");
+    LOG_PIN("  CS Pin: ", this->cs_);
+    LOG_UPDATE_INTERVAL(this);
+}
+
+void QSPI_74HC595_4X_DISPLAYComponent::display()
+{
+    uint32_t delay = static_cast<uint64_t>(this->get_update_interval()) * 1000 / 8;
+    const uint8_t *buf_ptr = reinterpret_cast<const uint8_t *>(this->buffer_);
+    for (uint8_t i = 0; i < 8; i++)
+    {
+        uint32_t start = micros();
+        this->enable();
+        this->write_cmd_addr_data(0, 0, 0, 0, buf_ptr, 8, 4);
+        buf_ptr += 8;
+        this->disable();
+        delay_microseconds_safe(delay - (micros() - start));
+    }
+    // zero out everything to have a somewhat uniform duty cycle for all digits
+    this->enable();
+    this->write_cmd_addr_data(0, 0, 0, 0, QSPI_74HC595_4X_DISPLAY_ZEROS, 32, 4);
+    this->disable();
+}
+
+void QSPI_74HC595_4X_DISPLAYComponent::update()
+{
+    for (uint8_t i = 0; i < 8; i++)
+        this->buffer_[i * 2] = 0xFFFFFFFF;
+    if (this->writer_.has_value())
+        (*this->writer_)(*this);
+    this->display();
+}
+
+uint8_t QSPI_74HC595_4X_DISPLAYComponent::print(uint8_t start_pos, const char *str)
+{
+    uint8_t pos = start_pos;
+
+    for (; *str != '\0'; str++)
+    {
+        uint32_t data = QSPI_74HC595_4X_DISPLAY_UNKNOWN_CHAR;
+        if (*str >= ' ' && *str <= '~')
+            data = QSPI_74HC595_4X_DISPLAY_ASCII_TO_RAW[*str - ' '];
+
+        if (data == QSPI_74HC595_4X_DISPLAY_UNKNOWN_CHAR)
+        {
+            ESP_LOGW(
+                TAG,
+                "Encountered character '%c' with no QSPI_74HC595_4X_DISPLAY representation while translating string!",
+                *str);
+        }
+        if (*str == '.')
+        {
+            if (pos != start_pos)
+                pos--;
+            this->buffer_[(pos % 8) * 2] &= ~(0x00000010 << (pos / 8));
+        }
+        else
+        {
+            if (pos >= 32)
+            {
+                ESP_LOGE(TAG, "QSPI_74HC595_4X_DISPLAY String is too long for the display!");
+                break;
+            }
+            this->buffer_[(pos % 8) * 2] &= ~(data << (pos / 8));
+        }
+        pos++;
+    }
+
+    return pos - start_pos;
+}
+
+uint8_t QSPI_74HC595_4X_DISPLAYComponent::print(const char *str)
+{
+    return this->print(0, str);
+}
+
+uint8_t QSPI_74HC595_4X_DISPLAYComponent::printf(uint8_t pos, const char *format, ...)
+{
+    va_list arg;
+    va_start(arg, format);
+    char buffer[64];
+    int ret = vsnprintf(buffer, sizeof(buffer), format, arg);
+    va_end(arg);
+    if (ret > 0)
+        return this->print(pos, buffer);
+    return 0;
+}
+
+uint8_t QSPI_74HC595_4X_DISPLAYComponent::printf(const char *format, ...)
+{
+    va_list arg;
+    va_start(arg, format);
+    char buffer[64];
+    int ret = vsnprintf(buffer, sizeof(buffer), format, arg);
+    va_end(arg);
+    if (ret > 0)
+        return this->print(buffer);
+    return 0;
+}
+
+void QSPI_74HC595_4X_DISPLAYComponent::set_writer(qspi_74hc595_4x_display_writer_t &&writer)
+{
+    this->writer_ = writer;
+}
+
+uint8_t QSPI_74HC595_4X_DISPLAYComponent::strftime(uint8_t pos, const char *format, ESPTime time)
+{
+    char buffer[64];
+    size_t ret = time.strftime(buffer, sizeof(buffer), format);
+    if (ret > 0)
+        return this->print(pos, buffer);
+    return 0;
+}
+uint8_t QSPI_74HC595_4X_DISPLAYComponent::strftime(const char *format, ESPTime time)
+{
+    return this->strftime(0, format, time);
+}
+
+} // namespace qspi_74hc595_4x_display
+} // namespace esphome

components/qspi_74hc595_4x_display/qspi_74hc595_4x_display.h

@@ -0,0 +1,56 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/core/time.h"
+
+#include "esphome/components/spi/spi.h"
+
+namespace esphome {
+namespace qspi_74hc595_4x_display {
+
+class QSPI_74HC595_4X_DISPLAYComponent;
+
+using qspi_74hc595_4x_display_writer_t = std::function<void(QSPI_74HC595_4X_DISPLAYComponent &)>;
+
+class QSPI_74HC595_4X_DISPLAYComponent : public PollingComponent,
+                         public spi::SPIDevice<spi::BIT_ORDER_MSB_FIRST, spi::CLOCK_POLARITY_LOW,
+                                               spi::CLOCK_PHASE_LEADING, spi::DATA_RATE_10MHZ> {
+ public:
+  void set_writer(qspi_74hc595_4x_display_writer_t &&writer);
+
+  void setup() override;
+
+  void dump_config() override;
+
+  void update() override;
+
+  float get_setup_priority() const override;
+
+  void display();
+
+  /// Evaluate the printf-format and print the result at the given position.
+  uint8_t printf(uint8_t pos, const char *format, ...) __attribute__((format(printf, 3, 4)));
+  /// Evaluate the printf-format and print the result at position 0.
+  uint8_t printf(const char *format, ...) __attribute__((format(printf, 2, 3)));
+
+  /// Print `str` at the given position.
+  uint8_t print(uint8_t pos, const char *str);
+  /// Print `str` at position 0.
+  uint8_t print(const char *str);
+
+  /// Evaluate the strftime-format and print the result at the given position.
+  uint8_t strftime(uint8_t pos, const char *format, ESPTime time) __attribute__((format(strftime, 3, 0)));
+
+  /// Evaluate the strftime-format and print the result at position 0.
+  uint8_t strftime(const char *format, ESPTime time) __attribute__((format(strftime, 2, 0)));
+
+ protected:
+  void send_byte_(uint8_t a_register, uint8_t data);
+  void send_to_all_(uint8_t a_register, uint8_t data);
+
+  uint32_t buffer_[16]; // 8* segment+digit words
+  optional<qspi_74hc595_4x_display_writer_t> writer_{};
+};
+
+}  // namespace qspi_74hc595_4x_display
+}  // namespace esphome

components/spi_74hc595_display/display.py

@@ -12,8 +12,6 @@ SPI_74HC595_DISPLAYComponent = spi_74hc595_display_ns.class_(
 SPI_74HC595_DISPLAYComponentRef = SPI_74HC595_DISPLAYComponent.operator("ref")
 
 CONF_REVERSE = "reverse"
-CONF_SEGMENT_FIRST = "segment_first"
-CONF_COMMON_CATHODE = "common_cathode"
 
 CONFIG_SCHEMA = (
     display.BASIC_DISPLAY_SCHEMA.extend(
@@ -21,8 +19,6 @@ CONFIG_SCHEMA = (
             cv.GenerateID(): cv.declare_id(SPI_74HC595_DISPLAYComponent),
             cv.Optional(CONF_NUM_CHIPS, default=1): cv.int_range(min=1, max=255),
             cv.Optional(CONF_REVERSE, default=False): cv.boolean,
-            cv.Optional(CONF_SEGMENT_FIRST, default=False): cv.boolean,
-            cv.Optional(CONF_COMMON_CATHODE, default=False): cv.boolean,
         }
     )
     .extend(cv.polling_component_schema("1s"))
@@ -37,8 +33,6 @@ async def to_code(config):
 
     cg.add(var.set_num_chips(config[CONF_NUM_CHIPS]))
     cg.add(var.set_reverse(config[CONF_REVERSE]))
-    cg.add(var.set_segment_first(config[CONF_SEGMENT_FIRST]))
-    cg.add(var.set_common_cathode(config[CONF_COMMON_CATHODE]))
 
     if CONF_LAMBDA in config:
         lambda_ = await cg.process_lambda(

components/spi_74hc595_display/spi_74hc595_display.cpp

@@ -1,10 +1,12 @@
 #include "spi_74hc595_display.h"
-#include "esphome/core/log.h"
-#include "esphome/core/helpers.h"
 #include "esphome/core/hal.h"
+#include "esphome/core/helpers.h"
+#include "esphome/core/log.h"
 
-namespace esphome {
-namespace spi_74hc595_display {
+namespace esphome
+{
+namespace spi_74hc595_display
+{
 
 static const char *const TAG = "spi_74hc595_display";
 
@@ -12,224 +14,261 @@ static const uint8_t SPI_74HC595_DISPLAY_UNKNOWN_CHAR = 0b11111111;
 
 const uint8_t SPI_74HC595_DISPLAY_ASCII_TO_RAW[95] PROGMEM = {
     //.GFEDCBA
-    0b00000000,                        // ' ', ord 0x20
-    0b10000110,                        // '!', ord 0x21
-    0b00100010,                        // '"', ord 0x22
-    0b00110110,                        // '#', ord 0x23
-    0b00101101,                        // '$', ord 0x24
-    0b01001001,                        // '%', ord 0x25
-    0b00011011,                        // '&', ord 0x26
-    0b00100000,                        // ''', ord 0x27
-    0b00111001,                        // '(', ord 0x28
-    0b00001111,                        // ')', ord 0x29
-    0b00000001,                        // '*', ord 0x2A
-    0b00010000,                        // '+', ord 0x2B
-    0b00000100,                        // ',', ord 0x2C
-    0b01000000,                        // '-', ord 0x2D
-    0b10000000,                        // '.', ord 0x2E
-    0b01010010,                        // '/', ord 0x2F
-    0b00111111,                        // '0', ord 0x30
-    0b00000110,                        // '1', ord 0x31
-    0b01011011,                        // '2', ord 0x32
-    0b01001111,                        // '3', ord 0x33
-    0b01100110,                        // '4', ord 0x34
-    0b01101101,                        // '5', ord 0x35
-    0b01111101,                        // '6', ord 0x36
-    0b00000111,                        // '7', ord 0x37
-    0b01111111,                        // '8', ord 0x38
-    0b01101111,                        // '9', ord 0x39
-    0b00001001,                        // ':', ord 0x3A
-    0b00001101,                        // ';', ord 0x3B
-    0b00011000,                        // '<', ord 0x3C
-    0b01001000,                        // '=', ord 0x3D
-    0b00001100,                        // '>', ord 0x3E
-    0b01010011,                        // '?', ord 0x3F
-    0b01111011,                        // '@', ord 0x40
-    0b01110111,                        // 'A', ord 0x41
-    0b01111100,                        // 'B', ord 0x42
-    0b00111001,                        // 'C', ord 0x43
-    0b01011110,                        // 'D', ord 0x44
-    0b01111001,                        // 'E', ord 0x45
-    0b01110001,                        // 'F', ord 0x46
-    0b00111101,                        // 'G', ord 0x47
-    0b01110110,                        // 'H', ord 0x48
-    0b00000110,                        // 'I', ord 0x49
-    0b00011110,                        // 'J', ord 0x4A
-    SPI_74HC595_DISPLAY_UNKNOWN_CHAR,  // 'K', ord 0x4B
-    0b00111000,                        // 'L', ord 0x4C
-    0b00110111,                        // 'M', ord 0x4D
-    0b01010100,                        // 'N', ord 0x4E
-    0b00111111,                        // 'O', ord 0x4F
-    0b01110011,                        // 'P', ord 0x50
-    0b10111111,                        // 'Q', ord 0x51
-    0b01010000,                        // 'R', ord 0x52
-    0b01101101,                        // 'S', ord 0x53
-    0b01110000,                        // 'T', ord 0x54
-    0b00111110,                        // 'U', ord 0x55
-    0b00111110,                        // 'V', ord 0x56
-    0b01111110,                        // 'W', ord 0x57
-    SPI_74HC595_DISPLAY_UNKNOWN_CHAR,  // 'X', ord 0x58
-    0b01110010,                        // 'Y', ord 0x59
-    0b01011011,                        // 'Z', ord 0x5A
-    0b00111001,                        // '[', ord 0x5B
-    0b01100100,                        // '\', ord 0x5C
-    0b00001111,                        // ']', ord 0x5D
-    0b00100011,                        // '^', ord 0x5E
-    0b00001000,                        // '_', ord 0x5F
-    0b00000010,                        // '`', ord 0x60
-    0b01110111,                        // 'a', ord 0x61
-    0b01111100,                        // 'b', ord 0x62
-    0b01011000,                        // 'c', ord 0x63
-    0b01011110,                        // 'd', ord 0x64
-    0b01111001,                        // 'e', ord 0x65
-    0b01110001,                        // 'f', ord 0x66
-    0b00111101,                        // 'g', ord 0x67
-    0b01110100,                        // 'h', ord 0x68
-    0b00000100,                        // 'i', ord 0x69
-    0b00011110,                        // 'j', ord 0x6A
-    SPI_74HC595_DISPLAY_UNKNOWN_CHAR,  // 'k', ord 0x6B
-    0b00111000,                        // 'l', ord 0x6C
-    0b00110111,                        // 'm', ord 0x6D
-    0b01010100,                        // 'n', ord 0x6E
-    0b01011100,                        // 'o', ord 0x6F
-    0b01110011,                        // 'p', ord 0x70
-    0b01100111,                        // 'q', ord 0x71
-    0b01010000,                        // 'r', ord 0x72
-    0b01101101,                        // 's', ord 0x73
-    0b01110000,                        // 't', ord 0x74
-    0b00011100,                        // 'u', ord 0x75
-    0b00011100,                        // 'v', ord 0x76
-    SPI_74HC595_DISPLAY_UNKNOWN_CHAR,  // 'w', ord 0x77
-    SPI_74HC595_DISPLAY_UNKNOWN_CHAR,  // 'x', ord 0x78
-    0b01110010,                        // 'y', ord 0x79
-    SPI_74HC595_DISPLAY_UNKNOWN_CHAR,  // 'z', ord 0x7A
-    0b01000110,                        // '{', ord 0x7B
-    0b00110000,                        // '|', ord 0x7C
-    0b01110000,                        // '}', ord 0x7D
-    0b01100011,                        // '~', ord 0x7E (degree symbol)
+    0b00000000,                       // ' ', ord 0x20
+    0b10000110,                       // '!', ord 0x21
+    0b00100010,                       // '"', ord 0x22
+    0b00110110,                       // '#', ord 0x23
+    0b00101101,                       // '$', ord 0x24
+    0b01001001,                       // '%', ord 0x25
+    0b00011011,                       // '&', ord 0x26
+    0b00100000,                       // ''', ord 0x27
+    0b00111001,                       // '(', ord 0x28
+    0b00001111,                       // ')', ord 0x29
+    0b00000001,                       // '*', ord 0x2A
+    0b00010000,                       // '+', ord 0x2B
+    0b00000100,                       // ',', ord 0x2C
+    0b01000000,                       // '-', ord 0x2D
+    0b10000000,                       // '.', ord 0x2E
+    0b01010010,                       // '/', ord 0x2F
+    0b00111111,                       // '0', ord 0x30
+    0b00000110,                       // '1', ord 0x31
+    0b01011011,                       // '2', ord 0x32
+    0b01001111,                       // '3', ord 0x33
+    0b01100110,                       // '4', ord 0x34
+    0b01101101,                       // '5', ord 0x35
+    0b01111101,                       // '6', ord 0x36
+    0b00000111,                       // '7', ord 0x37
+    0b01111111,                       // '8', ord 0x38
+    0b01101111,                       // '9', ord 0x39
+    0b00001001,                       // ':', ord 0x3A
+    0b00001101,                       // ';', ord 0x3B
+    0b00011000,                       // '<', ord 0x3C
+    0b01001000,                       // '=', ord 0x3D
+    0b00001100,                       // '>', ord 0x3E
+    0b01010011,                       // '?', ord 0x3F
+    0b01111011,                       // '@', ord 0x40
+    0b01110111,                       // 'A', ord 0x41
+    0b01111100,                       // 'B', ord 0x42
+    0b00111001,                       // 'C', ord 0x43
+    0b01011110,                       // 'D', ord 0x44
+    0b01111001,                       // 'E', ord 0x45
+    0b01110001,                       // 'F', ord 0x46
+    0b00111101,                       // 'G', ord 0x47
+    0b01110110,                       // 'H', ord 0x48
+    0b00000110,                       // 'I', ord 0x49
+    0b00011110,                       // 'J', ord 0x4A
+    SPI_74HC595_DISPLAY_UNKNOWN_CHAR, // 'K', ord 0x4B
+    0b00111000,                       // 'L', ord 0x4C
+    0b00110111,                       // 'M', ord 0x4D
+    0b01010100,                       // 'N', ord 0x4E
+    0b00111111,                       // 'O', ord 0x4F
+    0b01110011,                       // 'P', ord 0x50
+    0b10111111,                       // 'Q', ord 0x51
+    0b01010000,                       // 'R', ord 0x52
+    0b01101101,                       // 'S', ord 0x53
+    0b01110000,                       // 'T', ord 0x54
+    0b00111110,                       // 'U', ord 0x55
+    0b00111110,                       // 'V', ord 0x56
+    0b01111110,                       // 'W', ord 0x57
+    SPI_74HC595_DISPLAY_UNKNOWN_CHAR, // 'X', ord 0x58
+    0b01110010,                       // 'Y', ord 0x59
+    0b01011011,                       // 'Z', ord 0x5A
+    0b00111001,                       // '[', ord 0x5B
+    0b01100100,                       // '\', ord 0x5C
+    0b00001111,                       // ']', ord 0x5D
+    0b00100011,                       // '^', ord 0x5E
+    0b00001000,                       // '_', ord 0x5F
+    0b00000010,                       // '`', ord 0x60
+    0b01110111,                       // 'a', ord 0x61
+    0b01111100,                       // 'b', ord 0x62
+    0b01011000,                       // 'c', ord 0x63
+    0b01011110,                       // 'd', ord 0x64
+    0b01111001,                       // 'e', ord 0x65
+    0b01110001,                       // 'f', ord 0x66
+    0b00111101,                       // 'g', ord 0x67
+    0b01110100,                       // 'h', ord 0x68
+    0b00000100,                       // 'i', ord 0x69
+    0b00011110,                       // 'j', ord 0x6A
+    SPI_74HC595_DISPLAY_UNKNOWN_CHAR, // 'k', ord 0x6B
+    0b00111000,                       // 'l', ord 0x6C
+    0b00110111,                       // 'm', ord 0x6D
+    0b01010100,                       // 'n', ord 0x6E
+    0b01011100,                       // 'o', ord 0x6F
+    0b01110011,                       // 'p', ord 0x70
+    0b01100111,                       // 'q', ord 0x71
+    0b01010000,                       // 'r', ord 0x72
+    0b01101101,                       // 's', ord 0x73
+    0b01110000,                       // 't', ord 0x74
+    0b00011100,                       // 'u', ord 0x75
+    0b00011100,                       // 'v', ord 0x76
+    SPI_74HC595_DISPLAY_UNKNOWN_CHAR, // 'w', ord 0x77
+    SPI_74HC595_DISPLAY_UNKNOWN_CHAR, // 'x', ord 0x78
+    0b01110010,                       // 'y', ord 0x79
+    SPI_74HC595_DISPLAY_UNKNOWN_CHAR, // 'z', ord 0x7A
+    0b01000110,                       // '{', ord 0x7B
+    0b00110000,                       // '|', ord 0x7C
+    0b01110000,                       // '}', ord 0x7D
+    0b01100011,                       // '~', ord 0x7E (degree symbol)
 };
 
-float SPI_74HC595_DISPLAYComponent::get_setup_priority() const { return setup_priority::PROCESSOR; }
+const uint8_t SPI_74HC595_DISPLAY_DIGIT_MASK[8] PROGMEM = {
+    (1U << 4), (1U << 5), (1U << 6), (1U << 7), (1U << 0), (1U << 1), (1U << 2), (1U << 3),
+};
 
-void SPI_74HC595_DISPLAYComponent::setup() {
-  ESP_LOGCONFIG(TAG, "Setting up SPI_74HC595_DISPLAY...");
-  this->spi_setup();
-  this->buffer_ = new uint8_t[this->num_chips_ * 8];  // NOLINT
-  for (uint8_t i = 0; i < this->num_chips_ * 8; i++)
-    this->buffer_[i] = 0;
+float SPI_74HC595_DISPLAYComponent::get_setup_priority() const
+{
+    return setup_priority::PROCESSOR;
 }
 
-void SPI_74HC595_DISPLAYComponent::dump_config() {
-  ESP_LOGCONFIG(TAG, "SPI_74HC595_DISPLAY:");
-  ESP_LOGCONFIG(TAG, "  Number of Chips: %u", this->num_chips_);
-  LOG_PIN("  CS Pin: ", this->cs_);
-  LOG_UPDATE_INTERVAL(this);
+void SPI_74HC595_DISPLAYComponent::setup()
+{
+    ESP_LOGCONFIG(TAG, "Setting up SPI_74HC595_DISPLAY...");
+    this->spi_setup();
+    this->buffer_ = new uint8_t[this->num_chips_ * 8]; // NOLINT
+    for (uint8_t i = 0; i < this->num_chips_ * 8; i++)
+    {
+        this->buffer_[i] = 0;
+    }
 }
 
-void SPI_74HC595_DISPLAYComponent::display() {
-  uint32_t delay = static_cast<uint64_t>(this->get_update_interval())*1000 / 8;
-  uint8_t flip_digit=(this->common_cathode_)?0xFF:0x00;
-  uint8_t flip_segment = ~flip_digit;
-  for (uint8_t i = 0; i < 8; i++) {
+void SPI_74HC595_DISPLAYComponent::dump_config()
+{
+    ESP_LOGCONFIG(TAG, "SPI_74HC595_DISPLAY:");
+    ESP_LOGCONFIG(TAG, "  Number of Chips: %u", this->num_chips_);
+    LOG_PIN("  CS Pin: ", this->cs_);
+    LOG_UPDATE_INTERVAL(this);
+}
+
+void SPI_74HC595_DISPLAYComponent::display()
+{
+    uint32_t delay = static_cast<uint64_t>(this->get_update_interval()) * 1000 / 8;
+    for (uint8_t i = 0; i < 8; i++)
+    {
+        this->enable();
+        for (uint8_t j = 0; j < this->num_chips_; j++)
+        {
+            if (reverse_)
+            {
+                this->send_byte_(SPI_74HC595_DISPLAY_DIGIT_MASK[i], ~buffer_[(num_chips_ - j - 1) * 8 + i]);
+            }
+            else
+            {
+                this->send_byte_(SPI_74HC595_DISPLAY_DIGIT_MASK[i], ~buffer_[j * 8 + i]);
+            }
+        }
+        this->disable();
+        delay_microseconds_safe(delay);
+    }
+    // zero out everything to have a somewhat uniform duty cycle for all digits
     this->enable();
-    for (uint8_t j = 0; j < this->num_chips_; j++) {
-      if (reverse_) {
-        this->send_byte_((1U << i)^flip_digit, buffer_[(num_chips_ - j - 1) * 8 + i]^flip_segment);
-      } else {
-        this->send_byte_((1U << i)^flip_digit, (buffer_[j * 8 + i])^flip_segment);
-      }
+    for (uint8_t j = 0; j < this->num_chips_; j++)
+    {
+        this->send_byte_(0, 0);
     }
     this->disable();
-    delay_microseconds_safe(delay);
-  }
- // zero out everything to have a somewhat uniform duty cycle for all digits
-  this->enable();
-  for (uint8_t j = 0; j < this->num_chips_; j++) {
-    this->send_byte_(0, 0);
-  }
-  this->disable();
 }
 
-void SPI_74HC595_DISPLAYComponent::send_byte_(uint8_t a_digit, uint8_t data) {
-  if(this->segment_first_){
+void SPI_74HC595_DISPLAYComponent::send_byte_(uint8_t a_digit, uint8_t data)
+{
     this->write_byte(data);
     this->write_byte(a_digit);
-  } else {
-    this->write_byte(a_digit);
-    this->write_byte(data);
-  }
 }
 
-void SPI_74HC595_DISPLAYComponent::update() {
-  for (uint8_t i = 0; i < this->num_chips_ * 8; i++)
-    this->buffer_[i] = 0;
-  if (this->writer_.has_value())
-    (*this->writer_)(*this);
-  this->display();
+void SPI_74HC595_DISPLAYComponent::update()
+{
+    for (uint8_t i = 0; i < this->num_chips_ * 8; i++)
+        this->buffer_[i] = 0;
+    if (this->writer_.has_value())
+        (*this->writer_)(*this);
+    this->display();
 }
 
-uint8_t SPI_74HC595_DISPLAYComponent::print(uint8_t start_pos, const char *str) {
-  uint8_t pos = start_pos;
-  for (; *str != '\0'; str++) {
-    uint8_t data = SPI_74HC595_DISPLAY_UNKNOWN_CHAR;
-    if (*str >= ' ' && *str <= '~')
-      data = progmem_read_byte(&SPI_74HC595_DISPLAY_ASCII_TO_RAW[*str - ' ']);
+uint8_t SPI_74HC595_DISPLAYComponent::print(uint8_t start_pos, const char *str)
+{
+    uint8_t pos = start_pos;
+    for (; *str != '\0'; str++)
+    {
+        uint8_t data = SPI_74HC595_DISPLAY_UNKNOWN_CHAR;
+        if (*str >= ' ' && *str <= '~')
+            data = progmem_read_byte(&SPI_74HC595_DISPLAY_ASCII_TO_RAW[*str - ' ']);
 
-    if (data == SPI_74HC595_DISPLAY_UNKNOWN_CHAR) {
-      ESP_LOGW(TAG, "Encountered character '%c' with no SPI_74HC595_DISPLAY representation while translating string!", *str);
+        if (data == SPI_74HC595_DISPLAY_UNKNOWN_CHAR)
+        {
+            ESP_LOGW(TAG,
+                     "Encountered character '%c' with no SPI_74HC595_DISPLAY representation while translating string!",
+                     *str);
+        }
+        if (*str == '.')
+        {
+            if (pos != start_pos)
+                pos--;
+            this->buffer_[pos] |= 0b10000000;
+        }
+        else
+        {
+            if (pos >= this->num_chips_ * 8)
+            {
+                ESP_LOGE(TAG, "SPI_74HC595_DISPLAY String is too long for the display!");
+                break;
+            }
+            this->buffer_[pos] = data;
+        }
+        pos++;
     }
-    if (*str == '.') {
-      if (pos != start_pos)
-        pos--;
-      this->buffer_[pos] |= 0b10000000;
-    } else {
-      if (pos >= this->num_chips_ * 8) {
-        ESP_LOGE(TAG, "SPI_74HC595_DISPLAY String is too long for the display!");
-        break;
-      }
-      this->buffer_[pos] = data;
-    }
-    pos++;
-  }
-  return pos - start_pos;
+    return pos - start_pos;
 }
 
-uint8_t SPI_74HC595_DISPLAYComponent::print(const char *str) { return this->print(0, str); }
-
-uint8_t SPI_74HC595_DISPLAYComponent::printf(uint8_t pos, const char *format, ...) {
-  va_list arg;
-  va_start(arg, format);
-  char buffer[64];
-  int ret = vsnprintf(buffer, sizeof(buffer), format, arg);
-  va_end(arg);
-  if (ret > 0)
-    return this->print(pos, buffer);
-  return 0;
+uint8_t SPI_74HC595_DISPLAYComponent::print(const char *str)
+{
+    return this->print(0, str);
 }
 
-uint8_t SPI_74HC595_DISPLAYComponent::printf(const char *format, ...) {
-  va_list arg;
-  va_start(arg, format);
-  char buffer[64];
-  int ret = vsnprintf(buffer, sizeof(buffer), format, arg);
-  va_end(arg);
-  if (ret > 0)
-    return this->print(buffer);
-  return 0;
+uint8_t SPI_74HC595_DISPLAYComponent::printf(uint8_t pos, const char *format, ...)
+{
+    va_list arg;
+    va_start(arg, format);
+    char buffer[64];
+    int ret = vsnprintf(buffer, sizeof(buffer), format, arg);
+    va_end(arg);
+    if (ret > 0)
+        return this->print(pos, buffer);
+    return 0;
 }
 
-void SPI_74HC595_DISPLAYComponent::set_writer(spi_74hc595_display_writer_t &&writer) { this->writer_ = writer; }
-
-void SPI_74HC595_DISPLAYComponent::set_num_chips(uint8_t num_chips) { this->num_chips_ = num_chips; }
-
-uint8_t SPI_74HC595_DISPLAYComponent::strftime(uint8_t pos, const char *format, ESPTime time) {
-  char buffer[64];
-  size_t ret = time.strftime(buffer, sizeof(buffer), format);
-  if (ret > 0)
-    return this->print(pos, buffer);
-  return 0;
+uint8_t SPI_74HC595_DISPLAYComponent::printf(const char *format, ...)
+{
+    va_list arg;
+    va_start(arg, format);
+    char buffer[64];
+    int ret = vsnprintf(buffer, sizeof(buffer), format, arg);
+    va_end(arg);
+    if (ret > 0)
+        return this->print(buffer);
+    return 0;
 }
-uint8_t SPI_74HC595_DISPLAYComponent::strftime(const char *format, ESPTime time) { return this->strftime(0, format, time); }
 
-}  // namespace spi_74hc595_display
-}  // namespace esphome
+void SPI_74HC595_DISPLAYComponent::set_writer(spi_74hc595_display_writer_t &&writer)
+{
+    this->writer_ = writer;
+}
+
+void SPI_74HC595_DISPLAYComponent::set_num_chips(uint8_t num_chips)
+{
+    this->num_chips_ = num_chips;
+}
+
+uint8_t SPI_74HC595_DISPLAYComponent::strftime(uint8_t pos, const char *format, ESPTime time)
+{
+    char buffer[64];
+    size_t ret = time.strftime(buffer, sizeof(buffer), format);
+    if (ret > 0)
+        return this->print(pos, buffer);
+    return 0;
+}
+uint8_t SPI_74HC595_DISPLAYComponent::strftime(const char *format, ESPTime time)
+{
+    return this->strftime(0, format, time);
+}
+
+} // namespace spi_74hc595_display
+} // namespace esphome

components/spi_74hc595_display/spi_74hc595_display.h

@@ -30,8 +30,6 @@ class SPI_74HC595_DISPLAYComponent : public PollingComponent,
 
   void set_num_chips(uint8_t num_chips);
   void set_reverse(bool reverse) { this->reverse_ = reverse; };
-  void set_segment_first(bool segment_first) { this->segment_first_ = segment_first; };
-  void set_common_cathode(bool common_cathode) { this->common_cathode_ = common_cathode; };
 
   /// Evaluate the printf-format and print the result at the given position.
   uint8_t printf(uint8_t pos, const char *format, ...) __attribute__((format(printf, 3, 4)));
@@ -56,8 +54,6 @@ class SPI_74HC595_DISPLAYComponent : public PollingComponent,
   uint8_t num_chips_{1};
   uint8_t *buffer_;
   bool reverse_{false};
-  bool segment_first_{false};
-  bool common_cathode_{false};
   optional<spi_74hc595_display_writer_t> writer_{};
 };
 

esp32-clock-template.yaml

@@ -5,7 +5,7 @@ esphome:
 esp32:
   board: esp32dev
   framework:
-    type: arduino
+    type: esp-idf
 
 # Enable logging
 logger:
@@ -44,63 +44,147 @@ time:
   - platform: sntp
     id: sntp_time
     timezone: Europe/Berlin
-    on_time:
-      - seconds: /10
-        then:
-          - logger.log:
-              level: INFO
-              format: "%2d %2d %2d %2d"
-              args:
-                - 'uint32_t(id(runtime).state/3600) - uint32_t(id(runtime).state/86400)*1440'
-                - 'uint32_t(id(runtime).state/60) - uint32_t(id(runtime).state/3600)*60'
-                - 'uint32_t(id(runtime).state) - uint32_t(id(runtime).state/60)*60'
-                - 'uint32_t((id(runtime).state - uint32_t(id(runtime).state))*25)'
 
 spi:
-  clk_pin: GPIO18
-  mosi_pin: GPIO19
+  - id: quad_spi_bus
+    interface: spi3
+    clk_pin: 18
+    data_pins:
+      - 23
+      - 19
+      - 22
+      - 21
 
 sensor:
   - platform: uptime
     id: runtime
     update_interval: 100ms
 
+globals:
+  - id: countdown_end
+    type: time_t
+  - id: uptime_start
+    type: time_t
+
+number:
+  - platform: template
+    name: "Countdown set H"
+    id: cd_set_h
+    initial_value: 0
+    min_value: 0
+    max_value: 99
+    step: 1
+    optimistic: true
+    mode: box
+  - platform: template
+    name: "Countdown set M"
+    id: cd_set_m
+    initial_value: 0
+    min_value: 0
+    max_value: 59
+    step: 1
+    optimistic: true
+    mode: box
+  - platform: template
+    name: "Countdown set S"
+    id: cd_set_s
+    initial_value: 0
+    min_value: 0
+    max_value: 59
+    step: 1
+    optimistic: true
+    mode: box
+
+button:
+  - platform: template
+    name: "Countdown set"
+    on_press:
+      - lambda: |-
+          id(countdown_end) = 
+            id(sntp_time).timestamp_now()
+            + uint32_t(id(cd_set_h).state)*3600 
+            + uint32_t(id(cd_set_m).state)*60 
+            + uint32_t(id(cd_set_s).state);
+  - platform: template
+    name: "Countdown Minutes 1m"
+    on_press:
+      - lambda: |-
+          id(countdown_end) = id(sntp_time).timestamp_now() + 60;
+  - platform: template
+    name: "Countdown Minutes 5m"
+    on_press:
+      - lambda: |-
+          id(countdown_end) = id(sntp_time).timestamp_now() + 300;
+  - platform: template
+    name: "Countdown Minutes 10m"
+    on_press:
+      - lambda: |-
+          id(countdown_end) = id(sntp_time).timestamp_now() + 600;
+  - platform: template
+    name: "Countdown Hours 1h"
+    on_press:
+      - lambda: |-
+          id(countdown_end) = id(sntp_time).timestamp_now() + 3600;
+  - platform: template
+    name: "Countdown Hours 2h"
+    on_press:
+      - lambda: |-
+          id(countdown_end) = id(sntp_time).timestamp_now() + 7200;
+  - platform: template
+    name: "Runtime Reset"
+    on_press:
+      - lambda: |-
+          id(uptime_start) = id(runtime).state;
+
+
+
 display:
-  - platform: spi_74hc595_display
+  - platform: qspi_74hc595_4x_display
     cs_pin: GPIO5
-    data_rate: 1MHz #10MHz
-    num_chips: 1 #3
-    update_interval: 4s #16ms
-    common_cathode: false
-    segment_first: false
-    reverse: false
+    data_rate: 10MHz
+    update_interval: 10ms
+    spi_id: quad_spi_bus
     lambda: |-
+      static uint32_t last_micros=0;
       static uint32_t clock_frames=0;
       static uint32_t old_clock=0;
 
       if(id(sntp_time).now().second!=old_clock){
-        clock_frames=0;
+        last_micros = micros();
         old_clock=id(sntp_time).now().second;
       } else {
-        clock_frames++;
+        clock_frames = (micros()-last_micros)/10000;
       }
 
-      //it.printf(0, ".*`,_+'-");
-      it.printf(0, "88888888");
-      //it.strftime(0, "%H%M%s", id(sntp_time).now());
-      //it.printf(6, "%2d", clock_frames);
+      /////////// first display
+      it.printf(0, ".*`,_+'-");
 
-      //it.strftime(8, "%H%M%s", id(sntp_time).now());
-      //it.printf(14, "%2d", clock_frames);
-      /*it.strftime(8, "%H%M%s", id(sntp_time).now());*/
-      /*it.printf(14, "%1d", 0)*/
+      /////////// second display
+      it.strftime(8, "%H%M%S", id(sntp_time).now());
+      it.printf(14, "%02d", clock_frames%100);
 
-      /*it.printf(16, "%02d%02d%02d%02d",
-        uint32_t(id(runtime).state/3600) - uint32_t(id(runtime).state/86400)*1440,
-        uint32_t(id(runtime).state/60) - uint32_t(id(runtime).state/3600)*60,
-        uint32_t(id(runtime).state) - uint32_t(id(runtime).state/60)*60,
-        uint32_t((id(runtime).state - uint32_t(id(runtime).state))*25) );
-        */
+      /////////// third display
+      {
+        double delta = id(runtime).state - id(uptime_start);
+        uint32_t hours = delta/3600;
+        delta -= hours*3600;
+        uint32_t minutes = delta/60;
+        delta -= minutes*60;
+        uint32_t seconds = delta;
+        uint32_t frames = (100*delta) - (100*seconds);
+        it.printf(16, "%02d%02d%02d%02d", hours, minutes, seconds, frames);
+      }
+
+      /////////// fourth display
+      if (id(countdown_end) > id(sntp_time).timestamp_now()) {
+        time_t delta=difftime(id(countdown_end), id(sntp_time).timestamp_now());
+        time_t hours = delta/3600;
+        delta -= hours*3600;
+        time_t minutes = (delta)/60;
+        delta -= minutes*60;
+        time_t seconds = delta;
+        it.printf(24, "%02ld%02ld%02ld%02d", hours, minutes, seconds, (99-clock_frames%100));
+      }
 
 # the first display should display a test string to figure out the digit and segment map:
 # digit 0: >.< character (dot segment on)