Multifunctional Tester Based on STM32

The schematic design describes

the acquisition of voltage and current signals using an INA226 microcontroller.
Temperature is acquired using a MAX6675 microcontroller and a K-type thermocouple.
The software

cyclically prints the acquired parameters, and users can select data to upload to the serial port via buttons.
Code block:
int main(void)
{
uint16_t cur,temp;
// Clock initialization
SysTick_Init();
uart_init(115200);
// Screen initialization
TFT_Init();

// ADC initialization
Adc_Init();
// INA226 initialization
INA226_Init();
// MAX6675 initialization
MAX6675_Init();

// Key pin initialization
Init_Key_GPIO();

// Fill black
TFT_Fill(0,0,160,128,BLACK);

// Initialize static UI
TFT_StaticUI(&TestTools);

while(1)
{
// Key scan processing function
Key_Handle(&TestTools);
// Parameter display UI
TFT_ShowUI(&TestTools);

TestTools.InaVoltage=INA226_GetVoltage(WRITE_ADDR)/8;

cur = INA226_GetShuntCurrent(WRITE_ADDR); // Get current value
if(cur&0x8000)cur = ~(cur - 1); // Negative current // Because the negative terminal needs to be grounded, reverse current measurement is not allowed. Negative values ​​are actually not allowed.
TestTools.InaCurrent=cur;

TestTools.ResAdcValue=Get_Adc(4);//Get the resistance measurement ADC value
TestTools.BatAdcValue=Get_Adc(2);//Get the battery charge ADC value


temp=readMAX6675();
TestTools.TempConnection=temp&0x4;//0x4 is disconnected, 0 is connected to the thermocouple
temp= temp<<1;//Get bits 3~14
temp= temp>>4;
TestTools.temperature=temp;

if(TestTools.showmode==1)
printf("Voltage:%.2f
",TestTools.InaVoltage/100.0f);
if(TestTools.showmode==2)
printf("Current:%.3f
",TestTools.InaCurrent/1000.0f);
if(TestTools.showmode==3)
printf("Temperature:%.1f
",TestTools.temperature*0.25f);

delay_ms(300);

}
}


Physical demonstration instructions

and precautions
: Note that the battery is a single lithium battery.
Demonstration video
: https://space.bilibili.com/35559163?spm_id_from=333.1007.0.0