uart.c File Reference

#include "uart.h"
#include "rcc.h"
#include "gpio.h"

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Functions
int	__io_putchar (int ch)
void	USART3_Tx_Init (void)
void	UARTx_Write (USART_TypeDef *USARTx, uint8_t val)
void	UARTx_Config (USART_TypeDef *USARTx, uint32_t DataWidth, uint32_t Parity, uint32_t StopBits)
void	UARTx_SetBaudrate (USART_TypeDef *USARTx, uint32_t PeriphClock, uint32_t Baudrate)
uint16_t	UARTx_ComputeDivider (uint32_t PerpihClock, uint32_t Baudrate)
void	UARTx_SetTransferDirection (USART_TypeDef *USARTx, uint32_t Direction)

Function Documentation

__io_putchar()

int __io_putchar

(

int

ch

)

Retargeting part of implementation of printf.
From now on, USART3 will be used

Parameters

[in]

ch

character to be sent

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UARTx_ComputeDivider()

uint16_t UARTx_ComputeDivider	(	uint32_t	PerpihClock,
		uint32_t	Baudrate
	)

USART generic baudrate divider calculation method.

Parameters

[in]	PeriphClock	Peripheral Clock frequency [Hz]
[in]	Baudrate	Selectected baudrate for USART
[out]	BaudDiv	Calculated baudrate divider based on clock and desired baudrate

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UARTx_Config()

void UARTx_Config	(	USART_TypeDef *	USARTx,
		uint32_t	DataWidth,
		uint32_t	Parity,
		uint32_t	StopBits
	)

USART generic configuration method.

Parameters

[in]	USARTx	USART Handler
[in]	DataWidth	Width of data (refer to USARTx_CR1)
[in]	Parity	Enable of disable parity check (refer to USARTx_CR1)
[in]	StopBits	Number of stop bits (refer to USARTx_CR2)

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UARTx_SetBaudrate()

void UARTx_SetBaudrate	(	USART_TypeDef *	USARTx,
		uint32_t	PeriphClock,
		uint32_t	Baudrate
	)

USART generic baudrate selection method.

Parameters

[in]	USARTx	USART Handler
[in]	PeriphClock	Peripheral Clock frequency [Hz]
[in]	Baudrate	Selectected baudrate for USART

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UARTx_SetTransferDirection()

void UARTx_SetTransferDirection	(	USART_TypeDef *	USARTx,
		uint32_t	Direction
	)

USART generic tranmission selection method.

Parameters

[in]	USARTx	USART Handler
[in]	Direction	Transmission direction [Half Duplex, Full Duplex] (refer to USARTx_CR1)

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UARTx_Write()

void UARTx_Write	(	USART_TypeDef *	USARTx,
		uint8_t	val
	)

USART generic write method.
Applicable for both cases, when FIFO is disabled or enabled.

Parameters

[in]	USARTx	USART Handler
[in]	val	Value to be sent over USART (refer to USARTx_ISR and _TDR)

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USART3_Tx_Init()

void USART3_Tx_Init

(

void

)

USART3 initialization for transmission purposes.
For STM32H723 nucleo board, following pins are used:

• PD8 for Tx
• PD9 for Rx

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