nimaltd/master-modbus

master modbus library for STM32 LL

STM32 Master MODBUS LL Library

• http://www.github.com/NimaLTD
• https://www.instagram.com/github.nimaltd/
• https://www.youtube.com/@nimaltd

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();
}

master-modbus's Issues

usart.h

There is an included filein mmodbus.h, usart.h, but I do not see that anywhere. Where is it from?

read data from function ‫‪0x04‬‬

I want to read data from address 1, function 4, address reg ‫‪0x0000‬‬, 1 number, but not any action.
float txf[8];
mmodbus_readInputRegisters32f(1, 0, 1, txf);