STM32_Devel/SOFT/sine_sdio1/liball/usart.c

#include "usart.h"


void init_usart(void){

	GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;

	/* enable peripheral clock for USART2 */
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);


	/* GPIOA clock enable */
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

	/* GPIOA Configuration:  USART2 TX on PA2 */
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
	GPIO_Init(GPIOA, &GPIO_InitStructure);

	/* Connect USART2 pins to AF2 */
	// TX = PA2
	GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_USART2);

	USART_InitStructure.USART_BaudRate = 9600;
	USART_InitStructure.USART_WordLength = USART_WordLength_8b;
	USART_InitStructure.USART_StopBits = USART_StopBits_1;
	USART_InitStructure.USART_Parity = USART_Parity_No;
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
	USART_InitStructure.USART_Mode = USART_Mode_Tx;
	USART_Init(USART2, &USART_InitStructure);

	USART_Cmd(USART2, ENABLE); // enable USART2

}