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stm32: Add comments to configuration of OSPEEDR gpio speed

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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2021-10-12 13:32:46 -04:00
parent 9d9fe3cb1b
commit 1b801508ba
4 changed files with 15 additions and 8 deletions
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11
src/stm32/stm32f1.c
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@@ -68,7 +68,6 @@ gpio_clock_enable(GPIO_TypeDef *regs)
RCC->APB2ENR;
}
static void stm32f1_alternative_remap(uint32_t mapr_mask, uint32_t mapr_value)
{
// The MAPR register is a mix of write only and r/w bits
@@ -80,6 +79,8 @@ static void stm32f1_alternative_remap(uint32_t mapr_mask, uint32_t mapr_value)
AFIO->MAPR = mapr;
}
#define STM_OSPEED 0x1 // ~10Mhz at 50pF
// Set the mode and extended function of a pin
void
gpio_peripheral(uint32_t gpio, uint32_t mode, int pullup)
@@ -94,20 +95,20 @@ gpio_peripheral(uint32_t gpio, uint32_t mode, int pullup)
if (mode == GPIO_INPUT) {
cfg = pullup ? 0x8 : 0x4;
} else if (mode == GPIO_OUTPUT) {
cfg = 0x1;
cfg = STM_OSPEED;
} else if (mode == (GPIO_OUTPUT | GPIO_OPEN_DRAIN)) {
cfg = 0x5;
cfg = 0x4 | STM_OSPEED;
} else if (mode == GPIO_ANALOG) {
cfg = 0x0;
} else {
if (mode & GPIO_OPEN_DRAIN)
// Alternate function with open-drain mode
cfg = 0xd;
cfg = 0xc | STM_OSPEED;
else if (pullup > 0)
// Alternate function input pins use GPIO_INPUT mode on the stm32f1
cfg = 0x8;
else
cfg = 0x9;
cfg = 0x8 | STM_OSPEED;
}
if (pos & 0x8)
regs->CRH = (regs->CRH & ~msk) | (cfg << shift);