【RA-Eco-RA4M2开发板评测】使用RA4M2实现Modbus Master主机

上一贴我已经完成了modbus从机的解析，本期就来讲解modbus主机的解析，做一个完美的大结局吧！！！

在很多的开源协议栈中，比较有名的freemodbus，这个只有从机，没有主机，这个也非常的庞大，不好使用，还有一部分modbus的功能码也没有完整的实现！所以本期还是使用我自己的nanomodbus主机！！！！

建立工程之类的大家直接看我上一期的modbus从机帖子，不在重复造轮子浪费时间了。
https://bbs.elecfans.com/jishu_2488809_1_1.html

1，直接开始进入主题

打开KEIL文件

#include "hal_data.h"

#include "usart9.h"

#include "usart0.h"

#include "nanomodbus.h"

#include "port.h"

FSP_CPP_HEADER

void R_BSP_WarmStart(bsp_warm_start_event_t event);

FSP_CPP_FOOTER

// Our RTU address

#define RTU_SERVER_ADDRESS 1

/*******************************************************************************************************************//**

• main() is generated by the RA Configuration editor and is used to generate threads if an RTOS is used. This function

• is called by main() when no RTOS is used.

  **********************************************************************************************************************/

  void hal_entry(void)

  {

  /* TODO: add your own code here */

  UART9_Init();

  UART0_Init();

  clear_uart_buff();

  hal_systick_init();
  printf("hello RA4M2\r\n");

  printf("瑞萨电子Modbus主机开发\r\n");

nmbs_platform_conf platform_conf;

nmbs_platform_conf_create(&platform_conf);

platform_conf.transport = NMBS_TRANSPORT_RTU;

platform_conf.read = read_serial;

platform_conf.write = write_serial;

nmbs_t nmbs;

nmbs_error err = nmbs_client_create(&nmbs, &platform_conf);

if (err != NMBS_ERROR_NONE)

printf("nmbs_client_create NMBS_ERROR_NONE\r\n");

nmbs_set_read_timeout(&nmbs, 1000);

nmbs_set_byte_timeout(&nmbs, 100);

nmbs_set_destination_rtu_address(&nmbs, RTU_SERVER_ADDRESS);

while(1)

{

// Write 2 coils from address 64

nmbs_bitfield coils = {0};

nmbs_bitfield_write(coils, 0, 1);

nmbs_bitfield_write(coils, 1, 1);

err = nmbs_write_multiple_coils(&nmbs, 64, 2, coils);

// Read 3 coils from address 64
nmbs_bitfield_reset(coils);    // Reset whole bitfield to zero
err = nmbs_read_coils(&nmbs, 64, 3, coils);


// Write 2 holding registers at address 26
uint16_t w_regs[2] = {123, 124};
err = nmbs_write_multiple_registers(&nmbs, 26, 2, w_regs);


// Read 2 holding registers from address 26
uint16_t r_regs[2];
err = nmbs_read_holding_registers(&nmbs, 26, 2, r_regs);

HAL_Delay(500);

}

#if BSP_TZ_SECURE_BUILD

/* Enter non-secure code */

R_BSP_NonSecureEnter();

#endif

}

/*******************************************************************************************************************//**

• This function is called at various points during the startup process. This implementation uses the event that is

• called right before main() to set up the pins.

• @param[in] event Where at in the start up process the code is currently at

  **********************************************************************************************************************/

  void R_BSP_WarmStart (bsp_warm_start_event_t event)

  {

  if (BSP_WARM_START_RESET == event)

  {

  #if BSP_FEATURE_FLASH_LP_VERSION != 0

  /* Enable reading from data flash. */
   R_FACI_LP->DFLCTL = 1U;
  
   /* Would normally have to wait tDSTOP(6us) for data flash recovery. Placing the enable here, before clock and
    * C runtime initialization, should negate the need for a delay since the initialization will typically take more than 6us. */
  

#endif

}

if (BSP_WARM_START_POST_C == event)
{
    /* C runtime environment and system clocks are setup. */

    /* Configure pins. */
    R_IOPORT_Open(&IOPORT_CFG_CTRL, &IOPORT_CFG_NAME);

#if BSP_CFG_SDRAM_ENABLED

/* Setup SDRAM and initialize it. Must configure pins first. */
    R_BSP_SdramInit(true);

#endif

}

}

#if BSP_TZ_SECURE_BUILD

FSP_CPP_HEADER

BSP_CMSE_NONSECURE_ENTRY void template_nonsecure_callable ();

/* Trustzone Secure Projects require at least one nonsecure callable function in order to build (Remove this if it is not required to build). */

BSP_CMSE_NONSECURE_ENTRY void template_nonsecure_callable ()

{

}

FSP_CPP_FOOTER

#endif

打开串口助手，复位

打开modbusslave软件

可以看到RA4M2作为modbus主机给从机发数据，非常的完美

详情请看视屏