求:STM32串口设置为 7 Even 1 的方法
在设置stm32的时候,我发现我将串口设置为7 Even 1的模式,可以发送但是不能正确接收数据,我用的芯片的型号是stm32f303,用stm32F1的开发板时也发现这个问题。以下是stm32f303的串口初始化代码:USART_InitTypeDef USART_InitStructure;NVIC_InitTypeDefNVIC_InitStructure;
GPIO_InitTypeDefGPIO_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_7);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_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_InitStructure.GPIO_Pin = GPIO_Pin_2 ;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = BAUDRATE_9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//USART_WordLength包涵数据位和校验位,故为8
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_Even;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(UART_TYPE_RS485, &USART_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = IRQ_RS485_MAIN_PRIO;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = IRQ_RS485_SUB_PRIO;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_ITConfig(UART_TYPE_RS485, USART_IT_RXNE, ENABLE);
USART_Cmd(UART_TYPE_RS485, ENABLE);
本帖最后由 c疯鸟 于 2018-12-9 09:38 编辑
以下是stm32f103的串口初始化代码:
void USART_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
// 打开串口GPIO的时钟
DEBUG_USART_GPIO_APBxClkCmd(DEBUG_USART_GPIO_CLK, ENABLE);
// 打开串口外设的时钟
DEBUG_USART_APBxClkCmd(DEBUG_USART_CLK, ENABLE);
// 将USART Tx的GPIO配置为推挽复用模式
GPIO_InitStructure.GPIO_Pin = DEBUG_USART_TX_GPIO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(DEBUG_USART_TX_GPIO_PORT, &GPIO_InitStructure);
// 将USART Rx的GPIO配置为浮空输入模式
GPIO_InitStructure.GPIO_Pin = DEBUG_USART_RX_GPIO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(DEBUG_USART_RX_GPIO_PORT, &GPIO_InitStructure);
// 配置串口的工作参数
// 配置波特率
USART_InitStructure.USART_BaudRate = DEBUG_USART_BAUDRATE;
// 配置 针数据字长
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
// 配置停止位
USART_InitStructure.USART_StopBits = USART_StopBits_1;
// 配置校验位
USART_InitStructure.USART_Parity = USART_Parity_Even ;
// 配置硬件流控制
USART_InitStructure.USART_HardwareFlowControl =
USART_HardwareFlowControl_None;
// 配置工作模式,收发一起
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
// 完成串口的初始化配置
USART_Init(DEBUG_USARTx, &USART_InitStructure);
// 串口中断优先级配置
NVIC_Configuration();
// 使能串口接收中断
USART_ITConfig(DEBUG_USARTx, USART_IT_RXNE, ENABLE);
// 使能串口
USART_Cmd(DEBUG_USARTx, ENABLE);
}
USART_WordLength包含数据位和校验位,故为8 我知道了,输入要&0x7F得到正确数值
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