uart.c File Reference

UART initialization and I/O functions for STM32F4 UART1, UART2, and UART6. More...

#include "core/cortex-m4/uart.h"
#include "core/cortex-m4/clock.h"
#include "core/cortex-m4/gpio.h"

Include dependency graph for uart.c:

Functions
void	uart_init (uint32_t baudrate, hal_uart_t uart)
	Initialize the specified UART peripheral.
void	uart_write_char (char c, hal_uart_t uart)
	Transmit a single character via the specified UART.
void	uart_write_int (int32_t num, hal_uart_t uart)
	Transmit a 32-bit signed integer via UART.
void	uart_write_float (float num, hal_uart_t uart)
	Transmit a floating-point number via UART.
void	uart_write_string (const char *s, hal_uart_t uart)
	Transmit a null-terminated string via UART.
void	uart1_init (uint32_t baudrate)
	Initialize USART1 peripheral.
void	uart6_init (uint32_t baudrate)
	Initialize USART6 peripheral.
void	uart2_init (uint32_t baudrate)
	Initialize USART2 peripheral.
void	uart2_write_char (char c)
	Transmit a single character via USART2.
void	uart1_write_char (char c)
	Transmit a single character via USART1.
void	uart6_write_char (char c)
	Transmit a single character via USART6.
void	uart2_write_int (int32_t num)
	Transmit a 32-bit signed integer via USART2.
void	uart1_write_int (int32_t num)
	Transmit a 32-bit signed integer via USART1.
void	uart6_write_int (int32_t num)
	Transmit a 32-bit signed integer via USART6.
void	uart2_write_float (float num)
	Transmit a floating-point number via USART2.
void	uart1_write_float (float num)
	Transmit a floating-point number via USART1.
void	uart6_write_float (float num)
	Transmit a floating-point number via USART6.
void	uart2_write_string (const char *s)
	Transmit a null-terminated string via USART2.
void	uart1_write_string (const char *s)
	Transmit a null-terminated string via USART1.
void	uart6_write_string (const char *s)
	Transmit a null-terminated string via USART6.
char	uart_read_char (hal_uart_t uart)
	Read a single character from the specified UART.
char	uart1_read_char (void)
	Read a single character from USART1.
char	uart2_read_char (void)
	Read a single character from USART2.
char	uart6_read_char (void)
	Read a single character from USART6.
int	uart_available (hal_uart_t uart)
	Check if data is available to read from specified UART.
int	uart1_available (void)
	Check if data is available to read from USART1.
int	uart2_available (void)
	Check if data is available to read from USART2.
int	uart6_available (void)
	Check if data is available to read from USART6.
uint32_t	uart2_read_until (char *buffer, uint32_t maxlen, char delimiter)
	Read characters from USART2 until delimiter or max length.

Detailed Description

UART initialization and I/O functions for STM32F4 UART1, UART2, and UART6.

This file provides the implementation of UART communication functions for STM32F401RE microcontroller. It supports USART1, USART2, and USART6 peripherals with the following features:

• Baud rate configuration
• Character, integer, float, and string transmission
• Character reception
• Data availability checking
• Blocking (polling) implementations

The implementation uses GPIO alternate functions for UART pins and provides both generic (UART instance parameter) and specific functions.

Note

All functions are blocking and will wait for hardware operations to complete

Default configuration: 8 data bits, no parity, 1 stop bit

Author

Ashutosh Vishwakarma

Date

2025-07-23