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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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13
ports/stm32/stm32_it.c
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@@ -329,13 +329,16 @@ STATIC void OTG_CMD_WKUP_Handler(PCD_HandleTypeDef *pcd_handle) {
/* Reset SLEEPDEEP bit of Cortex System Control Register */
SCB->SCR &= (uint32_t)~((uint32_t)(SCB_SCR_SLEEPDEEP_Msk | SCB_SCR_SLEEPONEXIT_Msk));
/* Configures system clock after wake-up from STOP: enable HSE, PLL and select
PLL as system clock source (HSE and PLL are disabled in STOP mode) */
/* Configures system clock after wake-up from STOP: enable HSE/HSI, PLL and select
PLL as system clock source (HSE/HSI and PLL are disabled in STOP mode) */
__HAL_RCC_HSE_CONFIG(MICROPY_HW_CLK_HSE_STATE);
__HAL_RCC_HSE_CONFIG(MICROPY_HW_RCC_HSE_STATE);
#if MICROPY_HW_CLK_USE_HSI
__HAL_RCC_HSI_ENABLE();
#endif
/* Wait till HSE is ready */
while(__HAL_RCC_GET_FLAG(RCC_FLAG_HSERDY) == RESET)
/* Wait till HSE/HSI is ready */
while(__HAL_RCC_GET_FLAG(MICROPY_HW_RCC_FLAG_HSxRDY) == RESET)
{}
/* Enable the main PLL. */