【STM32C092RC 测评】+NUCLEO-C092RC开发板pwm+timer+控制呼吸
本帖最后由 yinxiangxv 于 2025-5-26 22:30 编辑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：
/* USER CODE BEGIN 2 */
// Start the PWM channels for both LEDs
// Note: Use the correct Timer handle and Channel defined by your configuration
if (HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_2) != HAL_OK) // For LED on PC9
{
Error_Handler();
}
if (HAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_1) != HAL_OK) // For LED on PA5
{
Error_Handler();
}
// --- Variables for breathing effect ---
// Set PWM_MAX_VALUE to your timer's ARR (Auto-Reload Register) value
// Assuming ARR was set to 999 for both timers in CubeMX for a 0-1000 range
uint32_t pwm_max_value = 999;
uint32_t brightness = 0;
int8_t step = 5; // How much to change brightness each step
uint8_t delay_ms = 10; // Delay between steps, controls breathing speed
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
// --- Fade In ---
for (brightness = 0; brightness <= pwm_max_value; brightness += step)
{
// Clamp brightness to max value in case step overshoots
if (brightness > pwm_max_value) {
brightness = pwm_max_value;
}
// Set the PWM duty cycle (Compare value) for both LEDs simultaneously
__HAL_TIM_SET_COMPARE(&htim1, TIM_CHANNEL_2, brightness); // LED on PC9
__HAL_TIM_SET_COMPARE(&htim2, TIM_CHANNEL_1, brightness); // LED on PA5
HAL_Delay(delay_ms); // Adjust delay for breathing speed
}
// Ensure brightness is exactly max value after loop
__HAL_TIM_SET_COMPARE(&htim1, TIM_CHANNEL_2, pwm_max_value);
__HAL_TIM_SET_COMPARE(&htim2, TIM_CHANNEL_1, pwm_max_value);
HAL_Delay(delay_ms * 10); // Optional: Pause briefly at full brightness
// --- Fade Out ---
// Start slightly below max to avoid issues with unsigned wrap-around if step doesn't divide evenly
for (brightness = pwm_max_value; brightness > 0; )
{
// Decrement first, then check bounds
if (brightness <= step) { // Prevent underflow for unsigned int
brightness = 0;
} else {
brightness -= step;
}
// Set the PWM duty cycle (Compare value) for both LEDs simultaneously
__HAL_TIM_SET_COMPARE(&htim1, TIM_CHANNEL_2, brightness); // LED on PC9
__HAL_TIM_SET_COMPARE(&htim2, TIM_CHANNEL_1, brightness); // LED on PA5
HAL_Delay(delay_ms); // Adjust delay for breathing speed
}
// Ensure brightness is exactly 0 after loop
__HAL_TIM_SET_COMPARE(&htim1, TIM_CHANNEL_2, 0);
__HAL_TIM_SET_COMPARE(&htim2, TIM_CHANNEL_1, 0);
HAL_Delay(delay_ms * 10); // Optional: Pause briefly when off
/* USER CODE END 3 */
}
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
并且构建成功：
继续新的探索
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