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stm32f4: reset peripherals in enable_pcclock() 

Reset peripherals to after enabling to clear stale
registers set by the bootloader.

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>
This commit is contained in:
Eric Callahan 2021-11-06 11:17:08 -04:00 committed by KevinOConnor
parent bf9d497ab0
commit a0615e5e17
1 changed files with 7 additions and 0 deletions
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7
src/stm32/stm32f4.c
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@ -24,10 +24,17 @@ enable_pclock(uint32_t periph_base)
uint32_t pos = (periph_base - APB1PERIPH_BASE) / 0x400;
RCC->APB1ENR |= (1<<pos);
RCC->APB1ENR;
RCC->APB1RSTR |= (1<<pos);
RCC->APB1RSTR &= ~(1<<pos);
} else if (periph_base < AHB1PERIPH_BASE) {
uint32_t pos = (periph_base - APB2PERIPH_BASE) / 0x400;
RCC->APB2ENR |= (1<<pos);
RCC->APB2ENR;
// Skip ADC peripheral reset as they share a bit
if (pos < 8 || pos > 10) {
RCC->APB2RSTR |= (1<<pos);
RCC->APB2RSTR &= ~(1<<pos);
}
} else if (periph_base < AHB2PERIPH_BASE) {
uint32_t pos = (periph_base - AHB1PERIPH_BASE) / 0x400;
RCC->AHB1ENR |= (1<<pos);