网上找到的都是 USART1的。。我写了一个USART2的。在103上验证通过。请参考。。
void USART2_Initialise( u32 bound )
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
USART_ClockInitTypeDef USART_ClockInitStruct;
USART_InitTypeDef USART_InitStructure;
/* Enable the USART2 Pins Software Remapping */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); //开启USART2时钟
/* Configure USART2 Rx (PA.03) as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure USART2 Tx (PA.02) as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//配置USART2
USART_InitStructure.USART_BaudRate = bound; //波特率9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//8位数据
USART_InitStructure.USART_StopBits = USART_StopBits_1; //在帧结尾传输1个停止位
USART_InitStructure.USART_Parity = USART_Parity_No; //不使用奇偶校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//硬件流控制失能
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//发送、接收使能
//配置USART2时钟
USART_ClockInitStruct.USART_Clock = USART_Clock_Disable; //时钟低电平活动
USART_ClockInitStruct.USART_CPOL = USART_CPOL_Low; //SLCK引脚上时钟输出的极性->低电平
USART_ClockInitStruct.USART_CPHA = USART_CPHA_2Edge; //时钟第二个边沿进行数据捕获
USART_ClockInitStruct.USART_LastBit = USART_LastBit_Disable; //最后一位数据的时钟脉冲不从SCLK输出
USART_Init(USART2, &USART_InitStructure);
USART_ClockInit(USART2, &USART_ClockInitStruct);
/* Enable the USART2 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
/* Enable USART2 */
USART_Cmd(USART2, ENABLE);
}
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