版本 e082235574b0bbac0963a5eda9a7827e28911284

embedded/USART

Changes from e082235574b0bbac0963a5eda9a7827e28911284 to 31fd626567435bc21037be833c809336dfe4d936

hello world!
CODE SECTION
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main()
{
//初始化GPIO
GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
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(GPIOB, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_USART1); 
GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_USART1);

//初始化UART
SART_InitStructure.USART_BaudRate = 115200;//設定baudrate
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//設定word長度為8位
USART_InitStructure.USART_StopBits = USART_StopBits_1;//1位停止字節
USART_InitStructure.USART_Parity = USART_Parity_No;//無奇偶檢驗
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//無流量控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//開啟Rx接收和Tx發送功能

USART_Init(USART1, &USART_InitStructure);
USART_Cmd(USART1, ENABLE);//啟動usart1


while(1)
{
    while(i < 100){
	send_byte('G');
	i++;
     }
    while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) != RESET)//等到有data才變為RESET
	b = (USART_ReceiveData(USART1) & 0x7F);



}

}
void send_byte(uint8_t b)
{
	
	USART_SendData(USART1, b);

    while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);//直到USART1是空
}

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