[STM32C0] 【STM32C092RC 测评】+NUCLEO-C092RC开发板pwm+timer+控制呼吸

采用工具进行相关的配置，选择好对应的封装？

这里开启了tim1，tim2对应的通道，同时进行相关参数的配置
根据时钟树的显示，这里面不再对时钟的频率进行修改，采用默认方式。

那么下面看看对应的关键配置，因为tim1是高级计时器，所以参数比较多，但是这里用到的比较有限

同理，tim2是一个普通计时器，只要简单正确配置就可以了
那么看看关键代码：

复制

1. /* USER CODE BEGIN 2 */
2. // Start the PWM channels for both LEDs
3. // Note: Use the correct Timer handle and Channel defined by your configuration
4. if (HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_2) != HAL_OK) // For LED on PC9
5. {
6. Error_Handler();
7. }
8. if (HAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_1) != HAL_OK) // For LED on PA5
9. {
10. Error_Handler();
11. }
12. // --- Variables for breathing effect ---
13. // Set PWM_MAX_VALUE to your timer's ARR (Auto-Reload Register) value
14. // Assuming ARR was set to 999 for both timers in CubeMX for a 0-1000 range
15. uint32_t pwm_max_value = 999;
16. uint32_t brightness = 0;
17. int8_t step = 5; // How much to change brightness each step
18. uint8_t delay_ms = 10; // Delay between steps, controls breathing speed
19. /* USER CODE END 2 */
20. /* Infinite loop */
21. /* USER CODE BEGIN WHILE */
22. while (1)
23. {
24. /* USER CODE END WHILE */
25. // --- Fade In ---
26. for (brightness = 0; brightness <= pwm_max_value; brightness += step)
27. {
28. // Clamp brightness to max value in case step overshoots
29. if (brightness > pwm_max_value) {
30. brightness = pwm_max_value;
31. }
32. // Set the PWM duty cycle (Compare value) for both LEDs simultaneously
33. __HAL_TIM_SET_COMPARE(&htim1, TIM_CHANNEL_2, brightness); // LED on PC9
34. __HAL_TIM_SET_COMPARE(&htim2, TIM_CHANNEL_1, brightness); // LED on PA5
35. HAL_Delay(delay_ms); // Adjust delay for breathing speed
36. }
37. // Ensure brightness is exactly max value after loop
38. __HAL_TIM_SET_COMPARE(&htim1, TIM_CHANNEL_2, pwm_max_value);
39. __HAL_TIM_SET_COMPARE(&htim2, TIM_CHANNEL_1, pwm_max_value);
40. HAL_Delay(delay_ms * 10); // Optional: Pause briefly at full brightness
41. // --- Fade Out ---
42. // Start slightly below max to avoid issues with unsigned wrap-around if step doesn't divide evenly
43. for (brightness = pwm_max_value; brightness > 0; )
44. {
45. // Decrement first, then check bounds
46. if (brightness <= step) { // Prevent underflow for unsigned int
47. brightness = 0;
48. } else {
49. brightness -= step;
50. }
51. // Set the PWM duty cycle (Compare value) for both LEDs simultaneously
52. __HAL_TIM_SET_COMPARE(&htim1, TIM_CHANNEL_2, brightness); // LED on PC9
53. __HAL_TIM_SET_COMPARE(&htim2, TIM_CHANNEL_1, brightness); // LED on PA5
54. HAL_Delay(delay_ms); // Adjust delay for breathing speed
55. }
56. // Ensure brightness is exactly 0 after loop
57. __HAL_TIM_SET_COMPARE(&htim1, TIM_CHANNEL_2, 0);
58. __HAL_TIM_SET_COMPARE(&htim2, TIM_CHANNEL_1, 0);
59. HAL_Delay(delay_ms * 10); // Optional: Pause briefly when off
60. /* USER CODE END 3 */
61. }
62. /* USER CODE BEGIN 3 */
63. }
64. /* USER CODE END 3 */

并且构建成功：

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作者：yinxiangxv
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