dtu_simple/app/HW/source/usart.c

#include "usart.h"
void nvic_config(void);
void gd_485_DE_pin_init(void)
{
    /* enable the 485 DE pin clock */
    rcu_periph_clock_enable(DE485_GPIO_CLK);
    /* configure 485 DE GPIO port */ 
    gpio_init(DE485_GPIO_PORT, GPIO_MODE_OUT_PP, GPIO_OSPEED_50MHZ, DE485_PIN);

    GPIO_BC(DE485_GPIO_PORT) = DE485_PIN;
}

/*!
    \brief      turn 485 to tx
    \param[out] none
    \retval     none
*/
void gd_485_DE_tx(void)
{
    GPIO_BOP(DE485_GPIO_PORT) = DE485_PIN;
}

/*!
    \brief      turn 485 to rx
    \param[out] none
    \retval     none
*/
void gd_485_DE_rx(void)
{
    GPIO_BC(DE485_GPIO_PORT) = DE485_PIN;
}

/*!
    \brief      COM port to send buff
    \param[in]  com: COM on the board
    \arg        COM_485
    \param[out] none
    \retval     none
*/
void gd_com_485_send(uint8_t *message,uint16_t size){
	uint16_t i=0;
	gd_485_DE_tx();
	for (i = 0; i < size; i++)
	{
		usart_data_transmit(COM_485, message[i]);
		while (RESET == usart_flag_get(COM_485, USART_FLAG_TC));
	}
	gd_485_DE_rx();
}

/*
 *  函数名：void config_485_port(uint32_t com,uint32_t baudrate, uint8_t databits, uint8_t stopbits, uint8_t parity, uint8_t flowcontrol)
 *  输入参数：com 串口，baudrate,databits,stopbits,parity,flowcontol 串口的配置参数
 *  输出参数：无
 *  返回值：无
 *  函数作用：配置485串口参数
 */
void config_485_port(uint32_t com,uint32_t baudrate, uint8_t databits, uint8_t stopbits, uint8_t parity)
{
	 uint32_t com_id = 0U;
	 uint8_t wordLength;
		if(parity!=0)
		{
			wordLength=databits+1;
		}else wordLength=databits;
			nvic_irq_enable(COM_485_IT_HANDLER, 0, 0);
			/* enable GPIO clock */
			rcu_periph_clock_enable(COM_485_GPIO_CLK);
			/* enable USART clock */
			rcu_periph_clock_enable(COM_485_CLK);
			/* connect port to USARTx_Tx */
			gpio_init(COM_485_GPIO_PORT, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, COM_485_TX_PIN);
			/* connect port to USARTx_Rx */
			gpio_init(COM_485_GPIO_PORT, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, COM_485_RX_PIN);
			//usart_deinit(com);
			usart_baudrate_set(com, baudrate);
			usart_word_length_set(com, (wordLength == 9) ? USART_WL_9BIT : USART_WL_8BIT);
			usart_stop_bit_set(com, (stopbits == 2) ? USART_STB_2BIT : USART_STB_1BIT);
			usart_parity_config(com, parity == 1 ? (USART_PM_ODD) : (parity == 2 ? USART_PM_EVEN : USART_PM_NONE));
			usart_hardware_flow_rts_config(com, USART_RTS_DISABLE);
			usart_hardware_flow_cts_config(com, USART_CTS_DISABLE);
			usart_receive_config(com, USART_RECEIVE_ENABLE);
			usart_transmit_config(com, USART_TRANSMIT_ENABLE);
			/* 使能串口 */
			usart_enable(com);
//			nvic_config();
//		  usart_interrupt_enable(com, USART_INT_RBNE);
//			usart_interrupt_enable(com, USART_INT_IDLE);
			//解决485第一个帧数据第一个字节丢失问题
			usart_flag_clear(COM_485,USART_FLAG_TC);
}

void nvic_config(void)
{
		nvic_irq_enable(USART0_IRQn, 0, 0);
}
void USART0_IRQHandler(void)
{
	 if (RESET != usart_interrupt_flag_get(USART0, USART_INT_FLAG_RBNE))
  {
   usart_interrupt_flag_clear(USART0, USART_INT_FLAG_RBNE);
  }

  if (RESET != usart_interrupt_flag_get(USART0, USART_INT_FLAG_IDLE))
  {
		usart_interrupt_flag_clear(USART0, USART_INT_FLAG_IDLE);
  }
  else
  {
    usart_interrupt_flag_clear(USART0, USART_INT_FLAG_RBNE);
  }
}