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STM32 Master MODBUS LL Library

ko-fi

This is the MMODBUS STM32 LL Library

  • support MODBUS RTU
  • support MODBUS ASCII

Tested devices

  • F0
  • F1
  • F2
  • F3
  • F4
  • F7
  • H7

How to use this Library:

  • Select "General peripheral Initalizion as a pair of '.c/.h' file per peripheral" on project settings.
  • Enable USART and enable interrupt.
  • Config USART.
  • Enable TX DMA is optional.
  • Enable FREERTOS is optional.
  • Enable a gpio as output for RS485 control pin.
  • Add mmodbus_callback() into USART IRQ callback.
  • If Enabled TX DMA, Add mmodbus_callback_txDMA() into DMA callback.
  • Include Header and source into your project.
  • Config "mmodbusConfig.h".
  • Call mmodbus_init(..).
#include "mmodbus.h"

int main()
{
  mmodbus_init(2500);
  mmodbus_writeCoil(10, 0, 1);
  
  while(1)
  {
    
  }
}

in stm32f4xx_it.c

void USART3_IRQHandler(void)
{
  mmodbus_callback();
}

// if use tx dma
void DMA1_Stream3_IRQHandler(void)
{
  mmodbus_callback_txDMA();
}