STM32H750

Created Wednesday 22 November 2023

Configuring MCU

Set MCU debug / clock options
Add some GPIO output for LED output (we will togle it when MCU receives 0x01)
Enable UART ports (set port speed to 921600 bps if you want to use loopback.exe from the video)
Enable DMA TX and RX channels for each UART port
Set RX channel mode to circular for each UART port
Enable UART global interrupt for each UART port
Generate code (ALT+K)

Adding library

Download uart library from here
Copy uart.c and uart.h to core/src folder of your project (the same directory as main.c)
Open uart.h, uncomment #define STM32H7
Add includes to /* USER CODE BEGIN Includes */:

#include "uart.h"
#include "math.h" // for round

Add code to /* USER CODE BEGIN PV */:

#define UART_BUFFER_SIZE 128
#define TEMP_BUFFER_SIZE 100
#define PORT_NUM 5
__IO uint8_t uartBuffer[PORT_NUM][UART_BUFFER_SIZE];
__IO uint8_t tempBuffer[PORT_NUM][TEMP_BUFFER_SIZE];

Add code right before /* USER CODE END 2 */:

	COM_Init(0, &huart1, (uint8_t *) &uartBuffer[0], UART_BUFFER_SIZE, 100);
	COM_Init(1, &huart2, (uint8_t *) &uartBuffer[1], UART_BUFFER_SIZE, 100);
	COM_Init(2, &huart3, (uint8_t *) &uartBuffer[2], UART_BUFFER_SIZE, 100);
	COM_Init(3, &huart4, (uint8_t *) &uartBuffer[3], UART_BUFFER_SIZE, 100);
	COM_Init(4, &huart5, (uint8_t *) &uartBuffer[4], UART_BUFFER_SIZE, 100);
	
	float floatTemp[PORT_NUM]={-60.3, 18.0, 121.5, 30, 40 }; // -60.3, 18, 121.5, 30, 40 Deg C

Add code to while(1) loop:

		uint8_t header;
		uint8_t length;

		for (int portNum=0;portNum<PORT_NUM;portNum++)
		{

			COM_Select(portNum);

			if (COM_ReadFast((uint8_t *)&header,1)) switch(header)
			{
			case 0x01:
			{
				uint8_t answer=0x55;
				COM_Write((uint8_t *)&answer,1);
				break; // command 0x01
			}

			case 0x02:
			{

				int32_t intTemp=round(floatTemp[portNum]*1000);
				COM_Write((uint8_t *)&intTemp,4);
				break; // command 0x02
			}

			case 0x03:
			{
				COM_Read((uint8_t *)&length,1);
				COM_Read((uint8_t *)&tempBuffer[portNum],length); // should check length here
				COM_Write((uint8_t *)&tempBuffer[portNum],length);
				break; // command 0x03
			}


			}
		}

Everything is ready! You can build and flash it to STM32H7 MCU, run loopback.exe and see if it connects.