1、创建基础工程，使用PA0与PA1为TM1637的时钟与数据IO

2、打开LSE、UART，配置RTC的闹钟为1秒周期

3、生成mdk工程。

4、添加TM1637的驱动：

#include "tm1637.h"
#include "NimaLTD.NimaLTD-TM1637_conf.h"
#include "stm32c092xx.h"
#include "main.h"
#include "systick_delay.h"

void _tm1637Start(void);
void _tm1637Stop(void);
void _tm1637ReadResult(void);
void _tm1637WriteByte(unsigned char b);
void _tm1637DelayUsec(unsigned int i);
void _tm1637ClkHigh(void);
void _tm1637ClkLow(void);
void _tm1637DioHigh(void);
void _tm1637DioLow(void);
void tm1637SetBrightness(char brightness);


#define CLK_PORT GPIOA
#define DIO_PORT GPIOA
#define CLK_PIN GPIO_PIN_0
#define DIO_PIN GPIO_PIN_1
#define CLK_PORT_CLK_ENABLE __HAL_RCC_GPIOA_CLK_ENABLE
#define DIO_PORT_CLK_ENABLE __HAL_RCC_GPIOA_CLK_ENABLE


const char segmentMap[] = {
    0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, // 0-7
    0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71, // 8-9, A-F
    0x00
};


void tm1637Init(void)
{
    CLK_PORT_CLK_ENABLE();
    DIO_PORT_CLK_ENABLE();
    GPIO_InitTypeDef g = {0};
    g.Pull = GPIO_PULLUP;
    g.Mode = GPIO_MODE_OUTPUT_OD; // OD = open drain
    g.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    g.Pin = CLK_PIN;
    HAL_GPIO_Init(CLK_PORT, &g);
    g.Pin = DIO_PIN;
    HAL_GPIO_Init(DIO_PORT, &g);

    tm1637SetBrightness(8);
}

void tm1637DisplayDecimal(int v, int displaySeparator)
{
    unsigned char digitArr[4];
    for (int i = 0; i < 4; ++i) {
        digitArr[i] = segmentMap[v % 10];
        if (i == 2 && displaySeparator) {
            digitArr[i] |= 1 << 7;
        }
        v /= 10;
    }

    _tm1637Start();
    _tm1637WriteByte(0x40);
    _tm1637ReadResult();
    _tm1637Stop();

    _tm1637Start();
    _tm1637WriteByte(0xc0);
    _tm1637ReadResult();

    for (int i = 0; i < 4; ++i) {
        _tm1637WriteByte(digitArr[3 - i]);
        _tm1637ReadResult();
    }

    _tm1637Stop();
}
void TM1637_DisplayTime(RTC_TimeTypeDef sTime, int displaySeparator)
{
    unsigned char digitArr[4];

    digitArr[0] = segmentMap[sTime.Minutes / 10];
      digitArr[1] = segmentMap[sTime.Minutes % 10];
    digitArr[2] = segmentMap[sTime.Seconds / 10];
      digitArr[3] = segmentMap[sTime.Seconds % 10];

    _tm1637Start();
    _tm1637WriteByte(0x40);
    _tm1637ReadResult();
    _tm1637Stop();

    _tm1637Start();
    _tm1637WriteByte(0xc0);
    _tm1637ReadResult();

    for (int i = 0; i < 4; ++i) {
        _tm1637WriteByte(digitArr[3 - i]);
        _tm1637ReadResult();
    }

    _tm1637Stop();
}

// Valid brightness values: 0 - 8.
// 0 = display off.
void tm1637SetBrightness(char brightness)
{
    _tm1637Start();
    _tm1637WriteByte(0x87 + brightness);
    _tm1637ReadResult();
    _tm1637Stop();
}

void _tm1637Start(void)
{
    _tm1637ClkHigh();
    _tm1637DioHigh();
    _tm1637DelayUsec(2);
    _tm1637DioLow();
}

void _tm1637Stop(void)
{
    _tm1637ClkLow();
    _tm1637DelayUsec(2);
    _tm1637DioLow();
    _tm1637DelayUsec(2);
    _tm1637ClkHigh();
    _tm1637DelayUsec(2);
    _tm1637DioHigh();
}

void _tm1637ReadResult(void)
{
    _tm1637ClkLow();
    _tm1637DelayUsec(5);
    // while (dio); // We're cheating here and not actually reading back the response.
    _tm1637ClkHigh();
    _tm1637DelayUsec(2);
    _tm1637ClkLow();
}

void _tm1637WriteByte(unsigned char b)
{
    for (int i = 0; i < 8; ++i) {
        _tm1637ClkLow();
        if (b & 0x01) {
            _tm1637DioHigh();
        }
        else {
            _tm1637DioLow();
        }
        _tm1637DelayUsec(3);
        b >>= 1;
        _tm1637ClkHigh();
        _tm1637DelayUsec(3);
    }
}

void _tm1637DelayUsec(unsigned int i)
{
    delay_us(i);
}

void _tm1637ClkHigh(void)
{
    HAL_GPIO_WritePin(CLK_PORT, CLK_PIN, GPIO_PIN_SET);
}

void _tm1637ClkLow(void)
{
    HAL_GPIO_WritePin(CLK_PORT, CLK_PIN, GPIO_PIN_RESET);
}

void _tm1637DioHigh(void)
{
    HAL_GPIO_WritePin(DIO_PORT, DIO_PIN, GPIO_PIN_SET);
}

void _tm1637DioLow(void)
{
    HAL_GPIO_WritePin(DIO_PORT, DIO_PIN, GPIO_PIN_RESET);
}

在主函数中周期进行显示时间，显示完后关闭一次TM1637显示，再开启显示。这样就可以达到降低功耗：

  /* USER CODE BEGIN 2 */
    SysTick_Init();
  tm1637Init();
    // Optionally set brightness. 0 is off. By default, initialized to full brightness.
  tm1637SetBrightness(1);
    // Display the value "1234" and turn on the `:` that is between digits 2 and 3.

  RTC_TimeTypeDef sTime = {0};
    RTC_DateTypeDef sDate = {0};
//  RTC_AlarmConfig(1);
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
  if(flag)
    {
        flag = !flag;
        tm1637SetBrightness(1);
        HAL_RTC_GetTime(&hrtc, &sTime, RTC_FORMAT_BIN);
        /* Get the RTC current Date */
        HAL_RTC_GetDate(&hrtc, &sDate, RTC_FORMAT_BIN);
        shownum = (sTime.Minutes*100) + sTime.Seconds;
        tm1637DisplayDecimal(shownum, 1);
    }
    else
    {
        flag = !flag;
        tm1637SetBrightness(0);
    }


    HAL_PWR_EnterSTOPMode(PWR_MAINREGULATOR_ON, PWR_STOPENTRY_WFI);

【测试效果】

在关闭显示时，整个系统可以隆到0.7毫安，在打开数码管显示时，电流为1.5MA。感觉整体的电流都是给数码管用去了。

通过JP5来测试STM32C092的工作电流是只有0.08mA的工作电流，因此如果有LCD的显示器，那做为低功耗的时钟是非常好的。