USART driver implementation for STM32F401RE. More...

#include "stm32f401re_usart.h"
#include "common.h"
#include "arm_cortex_m4_nvic.h"
#include "stm32f401re.h"
#include "stm32f401re_rcc.h"

Include dependency graph for stm32f401re_usart.c:

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Functions
static void	usart_set_pclk (USART_REGDEF_ts const *instance, EN_STATUS_te en_status)
	Enables or disables the peripheral clock for a USART instance.
static void	usart_set_baud_rate (USART_CFG_ts *usart_cfg)
	Computes and writes the BRR register for the configured baud rate.
void	usart_init (USART_CFG_ts *usart_cfg)
	Initializes the USART peripheral with the given configuration.
void	usart_deinit (USART_REGDEF_ts const *instance)
	Deinitializes the USART peripheral, disables its NVIC interrupt, and disables its clock.
void	usart_send (USART_REGDEF_ts instance, uint8_t tx_buffer, uint32_t len)
	Blocking USART transmit.
void	usart_receive (USART_REGDEF_ts const instance, uint8_t rx_buffer, uint32_t len)
	Blocking USART receive.
void	usart_set_transmission (USART_REGDEF_ts *instance, EN_STATUS_te en_status)
	Enables or disables the USART transmitter.
void	usart_set_reception (USART_REGDEF_ts *instance, EN_STATUS_te en_status)
	Enables or disables the USART receiver.
void	usart_get_name (USART_REGDEF_ts const instance, char name)
	Returns the name string of a USART peripheral instance.
void	USART1_IRQHandler (void)
	USART1 interrupt handler. Dispatches RXNE events to usart1_irq_data_recv_callback.
void	USART2_IRQHandler (void)
	USART2 interrupt handler. Currently empty — no interrupt sources configured.
void	USART6_IRQHandler (void)
	USART6 interrupt handler. Dispatches RXNE events to usart6_irq_data_recv_callback.
void	usart1_irq_data_recv_callback (uint8_t data) __attribute__((weak
	Default weak implementation of usart1_irq_data_recv_callback.
void	alias ("usart_irq_callback")))
void	usart6_irq_data_recv_callback (uint8_t data) __attribute__((weak
	Default weak implementation of usart6_irq_data_recv_callback.
void	usart_irq_callback (uint8_t data)
	Default fallback handler for unimplemented USART receive callbacks.

Detailed Description

USART driver implementation for STM32F401RE.

Author: github.com/Baksi675

Version: 0.1

Date: 2025-09-04

Copyright: Copyright (c) 2025

Definition in file stm32f401re_usart.c.

Function Documentation

◆ USART1_IRQHandler()

void USART1_IRQHandler ( void )

USART1 interrupt handler. Dispatches RXNE events to usart1_irq_data_recv_callback.

Checks the RXNE flag and reads USART_DR to clear it, then passes the received byte to the application callback. Only RXNE is handled; other interrupt sources are not checked.

Definition at line 259 of file stm32f401re_usart.c.

                             {
    if((USART1->USART_SR >> USART_SR_RXNE) & 0x1) {
        uint8_t data = USART1->USART_DR;
        usart1_irq_data_recv_callback(data);
    }
}

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◆ USART2_IRQHandler()

void USART2_IRQHandler ( void )

USART2 interrupt handler. Currently empty — no interrupt sources configured.

Definition at line 269 of file stm32f401re_usart.c.

269 {

270}

◆ USART6_IRQHandler()

void USART6_IRQHandler ( void )

USART6 interrupt handler. Dispatches RXNE events to usart6_irq_data_recv_callback.

Checks the RXNE flag and reads USART_DR to clear it, then passes the received byte to the application callback.

Definition at line 279 of file stm32f401re_usart.c.

                             {
    if((USART6->USART_SR >> USART_SR_RXNE) & 0x1) {
        uint8_t data = USART6->USART_DR;
        usart6_irq_data_recv_callback(data);
    }
}

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◆ usart_irq_callback()

void usart_irq_callback ( uint8_t data )

Default fallback handler for unimplemented USART receive callbacks.

Spins forever. Serves as the weak alias target for both usart1_irq_data_recv_callback and usart6_irq_data_recv_callback when no application override is provided.

Definition at line 312 of file stm32f401re_usart.c.

                                      {
    while(1);
}