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stm32f4: Add initial support for STM32F446 chip

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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2019-07-23 23:51:31 -04:00
parent 5a02572001
commit d501ca6b0b
9 changed files with 384 additions and 0 deletions
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55
src/stm32f4/serial.c Normal file
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// STM32F4 serial
//
// Copyright (C) 2019 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include "autoconf.h" // CONFIG_SERIAL_BAUD
#include "board/serial_irq.h" // serial_rx_byte
#include "command.h" // DECL_CONSTANT_STR
#include "internal.h" // enable_pclock
#include "sched.h" // DECL_INIT
DECL_CONSTANT_STR("RESERVE_PINS_serial", "PA3,PA2");
#define CR1_FLAGS (USART_CR1_UE | USART_CR1_RE | USART_CR1_TE \
| USART_CR1_RXNEIE)
void
serial_init(void)
{
enable_pclock(USART2_BASE);
uint32_t pclk = get_pclock_frequency(USART2_BASE);
uint32_t div = pclk / (CONFIG_SERIAL_BAUD * 16);
USART2->BRR = div << USART_BRR_DIV_Mantissa_Pos;
USART2->CR1 = CR1_FLAGS;
NVIC_SetPriority(USART2_IRQn, 0);
NVIC_EnableIRQ(USART2_IRQn);
gpio_peripheral(GPIO('A', 2), GPIO_FUNCTION, 7, 0);
gpio_peripheral(GPIO('A', 3), GPIO_FUNCTION, 7, 1);
}
DECL_INIT(serial_init);
void __visible
USART2_IRQHandler(void)
{
uint32_t sr = USART2->SR;
if (sr & (USART_SR_RXNE | USART_SR_ORE))
serial_rx_byte(USART2->DR);
if (sr & USART_SR_TXE && USART2->CR1 & USART_CR1_TXEIE) {
uint8_t data;
int ret = serial_get_tx_byte(&data);
if (ret)
USART2->CR1 = CR1_FLAGS;
else
USART2->DR = data;
}
}
void
serial_enable_tx_irq(void)
{
USART2->CR1 = CR1_FLAGS | USART_CR1_TXEIE;
}