STM32H750时钟配置成480M,HAL代码
时间: 2024-10-15 22:21:37 浏览: 52
STM32H750微控制器支持多种时钟配置选项,其中将系统时钟频率设置为480MHz通常涉及外设时钟树的调整以及HAL库提供的辅助函数。以下是配置步骤和示例HAL代码:
1. 首先,在`stm32h7xx_hal_conf.h`文件中启用48MHz的时钟源。默认情况下,H750使用HSI(内部高速振荡器)作为主时钟源,但你可以通过修改宏来选择其他时钟源,如HSE(外部高速晶体振荡器):
```c
// 如果你想用HSI(48MHz)
#define HSI_VALUE 48000000U
// 或者如果你想用HSE(8MHz)
#define HSE_VALUE 8000000U
#ifndef HAL_RCC_EX_HSECLK_CONFIG
#define HAL_RCC_EX_HSECLK_CONFIG(RCC_OscInitStruct) RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON | RCC_PLLSource_HSE; \
RCC_OscInitStruct.PLL.PLLM = (HSI_VALUE / HSE_VALUE); // 调整倍数
#endif
```
2. 接着,在你的应用程序初始化部分,配置时钟体系结构,例如:
```c
RCC_OscInitTypeDef RCC_OscInitStruct;
RCC_ClkInitTypeDef RCC_ClkInitStruct;
HAL_RCC_OscConfig(&RCC_OscInitStruct);
// 设置时钟源和分频比
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; // 或者RCC_PLLSOURCE_HSI
RCC_OscInitStruct.PLL.PLLM = (HSI_VALUE / HSE_VALUE); // 根据上一步定义的值
HAL_RCC_OscUpdate(&RCC_OscInitStruct);
HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7); // 选择适当的Flash延迟
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; // 使用PLL时钟作为系统时钟源
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; // AHB总线时钟分频
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4; // APB1总线时钟分频
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; // APB2总线时钟分频
HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7);
```
3. 最后,别忘了检查时钟是否成功激活:
```c
if (HAL_RCC_GetSysClockFreq() != 48000000) {
// 处理时钟未激活错误
}
```
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