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Divide HSE by 2 if the external XTAL used is 16 MHz

pull/14303/head
Yong Cong Sin 2021-02-19 15:35:47 +08:00
parent a36d006b7c
commit d81f520073
1 changed files with 5 additions and 2 deletions
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7
targets/TARGET_STM/TARGET_STM32F1/TARGET_STM32F103xE/system_clock.c
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@ -105,11 +105,14 @@ uint8_t SetSysClock_PLL_HSE(uint8_t bypass)
/* Enable HSE oscillator and activate PLL with HSE as source */
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
if (bypass == 0) {
RCC_OscInitStruct.HSEState = RCC_HSE_ON; /* External 8 MHz xtal on OSC_IN/OSC_OUT */
RCC_OscInitStruct.HSEState = RCC_HSE_ON; /* External xtal on OSC_IN/OSC_OUT */
} else {
RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS; /* External 8 MHz clock on OSC_IN */
}
RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1; // 8 MHz external xtal (8 MHz = 8 MHz / 1)
#if (HSE_VALUE == 16000000)
RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV2; // 16 MHz external xtal (8 MHz = 16 MHz / 2)
#endif
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9; // 72 MHz (8 MHz * 9)