【阿波罗STM32F767试用体验】第十一篇☞同样的时钟配置代码,为什么IAR和GNU下配置时钟之后的频率不一样?

STM32

【阿波罗STM32F767试用体验】第十一篇☞同样的时钟配置代码,为什么IAR和GNU下配置时钟之后的频率不一样?

2019-07-14 19:33发布

站内问答 / STM32/STM8

1057 1

同样的时钟配置代码,ucosiii官方的例程中的代码,我分别移植到iar和eclipse+gnu下.编译之后调试发现系统时钟竟然不一样.
先看下时钟配置代码

void BSP_SystemClkCfg (void)
{
static RCC_OscInitTypeDef RCC_OscInit;
static RCC_ClkInitTypeDef RCC_ClkInit;
HAL_StatusTypeDef hal_status;
__HAL_RCC_PWR_CLK_ENABLE(); //使能PWR时钟
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);//设置调压器输出电压级别，以便在器件未以最大频率工作
/* VCO out-freq = HSE * (PLLN / PLLM) = 432MHz. */
/* PLLCLK = (VCO out-freq) / PLLP = 216MHz. */
RCC_OscInit.OscillatorType = RCC_OSCILLATORTYPE_HSE; /* HSE freq = 25MHz. */
RCC_OscInit.HSEState = RCC_HSE_ON;
RCC_OscInit.HSIState = RCC_HSI_OFF;
RCC_OscInit.PLL.PLLState = RCC_PLL_ON;
RCC_OscInit.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInit.PLL.PLLM = 25u;
RCC_OscInit.PLL.PLLN = 432u;
RCC_OscInit.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInit.PLL.PLLQ = 9;/* PLL_Q out freq = (VCO out-freq) / PLLQ = 48MHz. */
//RCC_OscInit.PLL.PLLR = 7;
hal_status = HAL_RCC_OscConfig(&RCC_OscInit);
if (hal_status != HAL_OK) {
while (DEF_TRUE) { /* STOP if error */
;
}
}
hal_status = HAL_PWREx_EnableOverDrive(); /* Activate the OverDrive to reach the 216 Mhz Freq */
if (hal_status != HAL_OK) {
while (DEF_TRUE) { /* STOP if error */
;
}
}
RCC_ClkInit.ClockType = RCC_CLOCKTYPE_SYSCLK |
RCC_CLOCKTYPE_HCLK |
RCC_CLOCKTYPE_PCLK1 |
RCC_CLOCKTYPE_PCLK2;
RCC_ClkInit.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInit.AHBCLKDivider = RCC_SYSCLK_DIV1; /* HCLK = AHBCLK = PLLCLK / AHBPRES(1) = 216MHz. */
RCC_ClkInit.APB1CLKDivider = RCC_HCLK_DIV4; /* APB1CLK = AHBCLK / APB1DIV(4) = 54MHz. */
RCC_ClkInit.APB2CLKDivider = RCC_HCLK_DIV2; /* APB2CLK = AHBCLK / APB2DIV(2) = 108MHz. */
hal_status = HAL_RCC_ClockConfig(&RCC_ClkInit, FLASH_LATENCY_7);
if (hal_status != HAL_OK) {
while (DEF_TRUE) { /* STOP if error */
;
}
}
}