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stm32: Add compile-time option to use HSI as clock source.

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To use HSI instead of HSE define MICROPY_HW_CLK_USE_HSI as 1 in the board
configuration file.  The default is to use HSE.

HSI has been made the default for the NUCLEO_F401RE board to serve as an
example, and because early revisions of this board need a hardware
modification to get HSE working.
This commit is contained in:
Francisco J. Manno
2019-03-03 23:50:23 +00:00
committed by Damien George
parent e61862d063
commit f938e70c69
5 changed files with 65 additions and 31 deletions
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15
ports/stm32/powerctrl.c
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@@ -215,10 +215,10 @@ set_clk:
// Re-configure PLL
// Even if we don't use the PLL for the system clock, we still need it for USB, RNG and SDIO
RCC_OscInitTypeDef RCC_OscInitStruct;
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = MICROPY_HW_CLK_HSE_STATE;
RCC_OscInitStruct.OscillatorType = MICROPY_HW_RCC_OSCILLATOR_TYPE;
RCC_OscInitStruct.HSEState = MICROPY_HW_RCC_HSE_STATE;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLSource = MICROPY_HW_RCC_PLL_SRC;
RCC_OscInitStruct.PLL.PLLM = m;
RCC_OscInitStruct.PLL.PLLN = n;
RCC_OscInitStruct.PLL.PLLP = p;
@@ -297,9 +297,12 @@ void powerctrl_enter_stop_mode(void) {
#else
#if !defined(STM32L4)
// enable HSE
__HAL_RCC_HSE_CONFIG(MICROPY_HW_CLK_HSE_STATE);
while (!__HAL_RCC_GET_FLAG(RCC_FLAG_HSERDY)) {
// enable clock
__HAL_RCC_HSE_CONFIG(MICROPY_HW_RCC_HSE_STATE);
#if MICROPY_HW_CLK_USE_HSI
__HAL_RCC_HSI_ENABLE();
#endif
while (!__HAL_RCC_GET_FLAG(MICROPY_HW_RCC_FLAG_HSxRDY)) {
}
#endif