1、开启时钟
2、配置GOIO口
3、配置串口初始化
4、开启串口中断
5、编写串口发送函数与中断接收函数
1、开启时钟
void rcc_periph_clock_enable(void)
{
//启动GPIOA时钟
rcu_periph_clock_enable(RCU_GPIOA);
//开启串口时钟
rcu_periph_clock_enable(RCU_USART0);
}2、配置GOIO口
void GPIO_MOde_init(void)
{
//设置引脚复用1（USART）
gpio_af_set(GPIOA,GPIO_AF_1,GPIO_PIN_9);
gpio_af_set(GPIOA,GPIO_AF_1, GPIO_PIN_10);
//设置引脚输出
gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_9);
gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, GPIO_PIN_9);
gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_10);
gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, GPIO_PIN_10);
}3、配置串口初始化
void com_usart_init(void)
{
//设置缺省值
usart_deinit(USART0);
//配置串口波特率
usart_baudrate_set(USART0,65536U);//波特率115200
//配置数据位
usart_word_length_set(USART0, USART_WL_8BIT);//8个数据位
//配置停止位
usart_stop_bit_set(USART0, USART_STB_1BIT); //1个停止位
//配置奇偶校验位
usart_parity_config(USART0, USART_PM_NONE);//无奇偶校验
//RTS流控关闭
usart_hardware_flow_rts_config(USART0, USART_RTS_DISABLE);
//CTS流控关闭
usart_hardware_flow_cts_config(USART0, USART_CTS_DISABLE);
//配置串口接收使能
usart_receive_config(USART0, USART_RECEIVE_ENABLE);
//配置串口发送使能
usart_transmit_config(USART0, USART_TRANSMIT_ENABLE);
//初始化串口配置
usart_enable(USART0);
}
## 4、开启串口中断
void usart_IRQn_init(void)
{
//使能中断
usart_interrupt_enable(USART0,USART_INT_RBNE);
//使能中断优先级
nvic_irq_enable(USART0_IRQn, 0U);
}5、编写串口发送函数与中断接收函数
/*!
\brief 串口发送字节函数
\param[in] none
\param[out] none
\retval none
*/
void USART0_Send_Byte(uint8_t Send_Byte)
{
usart_data_transmit(USART0, Send_Byte);
while ( usart_flag_get(USART0, USART_FLAG_TBE)== RESET) ;
}
/*!
\brief 串口发送字符串函数
\param[in] none
\param[out] none
\retval none
*/
void USART0_Send_Str(uint8_t *Str)
{
while((*Str)!='\0')
{
USART0_Send_Byte(*Str);
Str++;
}
}
/*!
\brief 重定向c库函数printf到串口，重定向后可使用printf函数
\param[in] none
\param[out] none
\retval none
*/
int fputc(int ch, FILE *f)
{
/* 发送一个字节数据到串口 */
USART0_Send_Byte((uint8_t) ch);
return (ch);
}
uint8_t receiver_buffer[10];
void EXTI0_1_IRQHandler(void)
{
if(RESET != usart_interrupt_flag_get(USART0, USART_INT_FLAG_RBNE)){
/* receive data */
receiver_buffer[0] = usart_data_receive(USART0);
//判断数据内容，进行逻辑处理
if(receiver_buffer[0] == 0x1A)
{
}
}
}
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