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stm32: Add new gpioperiph.c file for gpio_peripheral() code

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The gpio_peripheral() code is the same in stm32f0.c, stm32f4.c, and
stm32h7.c.  Move that function to a new gpioperiph.c file to avoid
code duplication.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2021-12-18 19:12:41 -05:00
parent debcc22fc5
commit 2ee1f48895
5 changed files with 45 additions and 83 deletions
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37
src/stm32/gpioperiph.c Normal file
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// Code to setup gpio on stm32 chip (except for stm32f1)
//
// Copyright (C) 2019-2021 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include "internal.h" // gpio_peripheral
// Set the mode and extended function of a pin
void
gpio_peripheral(uint32_t gpio, uint32_t mode, int pullup)
{
GPIO_TypeDef *regs = digital_regs[GPIO2PORT(gpio)];
// Enable GPIO clock
gpio_clock_enable(regs);
// Configure GPIO
uint32_t mode_bits = mode & 0xf, func = (mode >> 4) & 0xf, od = mode >> 8;
uint32_t pup = pullup ? (pullup > 0 ? 1 : 2) : 0;
uint32_t pos = gpio % 16, af_reg = pos / 8;
uint32_t af_shift = (pos % 8) * 4, af_msk = 0x0f << af_shift;
uint32_t m_shift = pos * 2, m_msk = 0x03 << m_shift;
regs->AFR[af_reg] = (regs->AFR[af_reg] & ~af_msk) | (func << af_shift);
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);
// Setup OSPEEDR:
// stm32f0 is ~10Mhz at 50pF
// stm32f2 is ~25Mhz at 40pF
// stm32f4 is ~50Mhz at 40pF
// stm32h7 is ~85Mhz at 50pF
uint32_t ospeed = CONFIG_MACH_STM32F0 ? 0x01 : 0x02;
regs->OSPEEDR = (regs->OSPEEDR & ~m_msk) | (ospeed << m_shift);
}