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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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4
src/stm32/stm32f4.c
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@@ -68,6 +68,8 @@ gpio_clock_enable(GPIO_TypeDef *regs)
RCC->AHB1ENR;
}
#define STM_OSPEED 0x2 // ~50Mhz at 40pF on STM32F4 (~25Mhz at 40pF on STM32F2)
// Set the mode and extended function of a pin
void
gpio_peripheral(uint32_t gpio, uint32_t mode, int pullup)
@@ -88,7 +90,7 @@ gpio_peripheral(uint32_t gpio, uint32_t mode, int pullup)
regs->MODER = (regs->MODER & ~m_msk) | (mode_bits << m_shift);
regs->PUPDR = (regs->PUPDR & ~m_msk) | (pup << m_shift);
regs->OTYPER = (regs->OTYPER & ~(1 << pos)) | (od << pos);
regs->OSPEEDR = (regs->OSPEEDR & ~m_msk) | (0x02 << m_shift);
regs->OSPEEDR = (regs->OSPEEDR & ~m_msk) | (STM_OSPEED << m_shift);
}
#define USB_BOOT_FLAG_ADDR (CONFIG_RAM_START + CONFIG_RAM_SIZE - 4096)