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stm32: Make sure to enable the gpio clock prior to setting the first value

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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2019-08-20 01:04:20 -04:00
parent a67451fa36
commit c930fc392b
4 changed files with 22 additions and 4 deletions
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12
src/stm32/stm32f1.c
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@ -51,6 +51,15 @@ get_pclock_frequency(uint32_t periph_base)
return FREQ_PERIPH;
}
// Enable a GPIO peripheral clock
void
gpio_clock_enable(GPIO_TypeDef *regs)
{
uint32_t rcc_pos = ((uint32_t)regs - APB2PERIPH_BASE) / 0x400;
RCC->APB2ENR |= 1 << rcc_pos;
RCC->APB2ENR;
}
// Set the mode and extended function of a pin
void
gpio_peripheral(uint32_t gpio, uint32_t mode, int pullup)
@ -58,8 +67,7 @@ gpio_peripheral(uint32_t gpio, uint32_t mode, int pullup)
GPIO_TypeDef *regs = digital_regs[GPIO2PORT(gpio)];
// Enable GPIO clock
uint32_t rcc_pos = ((uint32_t)regs - APB2PERIPH_BASE) / 0x400;
RCC->APB2ENR |= 1 << rcc_pos;
gpio_clock_enable(regs);
// Configure GPIO
uint32_t pos = gpio % 16, shift = (pos % 8) * 4, msk = 0xf << shift, cfg;