为什么用原子哥的mini板的串口1与gsm-sim300能驱动他打电话,而用串口2就不行的呢,在调试助手上串口2能成功打印AT指令,求助
串口2初始化:
//重定义fputc函数
int fputc(int ch, FILE *f)
{
while((USART2->SR&0X40)==0);//循环发送,直到发送完毕
USART2->DR = (u8) ch;
return ch;
}
//初始化IO 串口2
//bound:波特率
void uart2_init(u32 bound){
//GPIO端口设置
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); //使能USART2时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能GPIOA时钟
USART_DeInit(USART2); //复位串口2
//USART2_TX PA.2
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA.2
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化PA2
//USART2_RX PA.3
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化PA3
//Usart2 NVIC 配置
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2 ;//抢占优先级3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //子优先级2
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器
//USART 初始化设置
USART_InitStructure.USART_BaudRate = bound;//一般设置为9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
USART_Init(USART2, &USART_InitStructure); //初始化串口
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启中断
USART_Cmd(USART2, ENABLE); //使能串口
}
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