介紹

開(kāi)發(fā)環(huán)境：IAR FOR ARM 9.30.1

RASC V4.3.0

芯片型號(hào)：R7FA2L1AB2DFL#AA0

功能描述

在串口+DTC功能時(shí)無(wú)法得知接收一幀數(shù)據(jù)是否接收結(jié)束。本例程配合ELC功能聯(lián)動(dòng)定時(shí)器來(lái)判斷串口接收字節(jié)與字節(jié)之間超時(shí)來(lái)判斷一幀數(shù)據(jù)的接收完成。

主要內(nèi)容

1新建RASC工程

RASC v4.3.0下載鏈接：

https://github.com/renesas/fsp/releases

如下圖所示：

2安裝好RASC

默認(rèn)安裝目錄：

C:RenesasRAsc_v2023-01_fsp_v4.3.0

雙擊?運(yùn)行RASC

3打開(kāi)后如下圖所示：

4新建工程

5配置串口PIN腳功能

6添加串口功能

7添加串口dtc收發(fā)功能

8配置串口屬性

9添加定時(shí)器

10配置定時(shí)器

這里以超時(shí)時(shí)間為2ms為例，用戶(hù)可以根據(jù)實(shí)際情況超時(shí)時(shí)間。

11添加ELC

12所需外設(shè)都已經(jīng)配置好，生成IAR工程

13打開(kāi)IAR工程

14在hal_entry.c文件添加如下代碼：

#define TRANSFER_LENGTH     512
transfer_properties_t uart0_dtcinfo1;


typedef struct sf_uart_conf
{
  uint8_t uart_txflag;                //發(fā)送標(biāo)志
  uint8_t uart_rxflag;                //接收標(biāo)志
  uint16_t uart_txlen;                //發(fā)送長(zhǎng)度
  uint16_t uart_rxlen;                //接收長(zhǎng)度
  uint8_t uart_rxbuf[TRANSFER_LENGTH];        //接收buf
  uint8_t uart_txbuf[TRANSFER_LENGTH];        //發(fā)送buf
} sf_uart_conf_t;


sf_uart_conf_t uart0;

//2ms定時(shí)器0回調(diào)函數(shù)
void uart0_rxtimeout_cb( timer_callback_args_t* p_args )
{
  if ( TIMER_EVENT_CYCLE_END == p_args->event )
  {
    //關(guān)定時(shí)器0
    ( void ) R_GPT_Stop( &g_timer0_ctrl );
    //獲取串口0 接收DTC信息
    R_DTC_InfoGet( &g_transfer1_ctrl, &uart0_dtcinfo1 );
    //計(jì)算串口0接收長(zhǎng)度
    uart0.uart_rxlen = TRANSFER_LENGTH - uart0_dtcinfo1.transfer_length_remaining;
    //置發(fā)送標(biāo)志
    uart0.uart_rxflag = 1;
  }
}

//串口中斷回調(diào)函數(shù)
void uart0isr_cb( uart_callback_args_t* p_args )
{
  /* Handle the UART event */
  switch ( p_args->event )
  {
    /* Received a character */
    case UART_EVENT_RX_CHAR:
      {
        break;
      }
    /* Receive complete */
    case UART_EVENT_RX_COMPLETE:
      {
        break;
      }
    /* Transmit complete */
    case UART_EVENT_TX_COMPLETE:
      {
       //置串口0發(fā)送完成標(biāo)志，清接收標(biāo)志
        uart0.uart_rxflag = 0;
        uart0.uart_txflag = 1;
        break;
      }
    default:
      {
      }
  }
}

void hal_entry(void)
{
 /* TODO: add your own code here */
 //初始化定時(shí)器0 2ms間隔中斷
  R_GPT_Open( &g_timer0_ctrl, &g_timer0_cfg );
  //初始化串口0
  R_SCI_UART_Open( &g_uart0_ctrl, &g_uart0_cfg );
  //初始化ELC聯(lián)動(dòng)
  R_ELC_Open( &g_elc_ctrl, &g_elc_cfg );
  //使能ECL
  R_ELC_Enable( &g_elc_ctrl );
  //使能定時(shí)器0
  ( void ) R_GPT_Enable( &g_timer0_ctrl );
  //智串口0發(fā)送標(biāo)志
  uart0.uart_txflag = 1;
  while ( true )
  {
    if ( uart0.uart_rxflag )
    {
      uart0.uart_rxflag = 0;
      uart0.uart_txlen = uart0.uart_rxlen;
      R_SCI_UART_Write( &g_uart0_ctrl, uart0.uart_rxbuf, uart0.uart_txlen );
    }
    if ( uart0.uart_txflag )
    {
      uart0.uart_txflag = 0;
      R_SCI_UART_Read( &g_uart0_ctrl, uart0.uart_rxbuf, TRANSFER_LENGTH );
    }
  }
#if BSP_TZ_SECURE_BUILD
  /* Enter non-secure code */
  R_BSP_NonSecureEnter();
#endif
}

15

仿真測(cè)試如下圖所示：

結(jié)論

該方式?jīng)]有問(wèn)題，可以正常應(yīng)用到開(kāi)發(fā)中。

審核編輯：湯梓紅