LVGL and touchscreen initialization
Core/Src/main.c lv_init();
lv_port_disp_init();
lv_port_indev_init();
LCD_BL_ON();
if(HAL_GPIO_ReadPin(GPIOC, CardDetectPin_Pin) == GPIO_PIN_RESET)
{
CardDetectedInSlot = true;
InitializeSDCard();
}
// ...existing code...
initTouchScr(); //lcdInit();
lcdFillRGB(COLOR_BLACK);
lcdSetOrientation(LCD_ORIENTATION_LANDSCAPE);
LVGL and touchscreen initialization is done in the main file. LCD initialization, orientation setting and touch driver startup.
SPI touchscreen handling
Core/Src/SPITouchScreen.c void Touch_ReadCoordinates(uint16_t* x, uint16_t* y)
{
uint8_t tempXH, tempXL, tempYH, tempYL;
Touch_Select(); // CS Low
Touch_SPI_Transfer(XPT2046_CMD_X); // Komenda dla odczytu X 0xD0
tempXH = Touch_SPI_Transfer(0x00); // Odczyt wyższego bajtu X
tempXL = Touch_SPI_Transfer(0x00); // Odczyt niższego bajtu X
Touch_SPI_Transfer(XPT2046_CMD_Y); // Komenda dla odczytu Y 0x90
tempYH = Touch_SPI_Transfer(0x00); // Odczyt wyższego bajtu Y
tempYL = Touch_SPI_Transfer(0x00); // Odczyt niższego bajtu Y
Touch_Unselect(); // CS High
*x = (tempXH << 8 | tempXL) >> 3; // Usunięcie nieużywanych bitów
*y = (tempYH << 8 | tempYL) >> 3; // Usunięcie nieużywanych bitów
}
The function reads touch coordinates from the XPT2046 sensor via SPI bus. Values are processed and returned as X and Y coordinates.
SD card and configuration files handling
Core/Src/File_Handling.c void InitializeSDCard()
{
// ... initialization code ...
hsd.Instance = SDIO;
hsd.Init.ClockEdge = SDIO_CLOCK_EDGE_RISING;
hsd.Init.ClockBypass = SDIO_CLOCK_BYPASS_DISABLE;
hsd.Init.ClockPowerSave = SDIO_CLOCK_POWER_SAVE_DISABLE;
hsd.Init.ClockDiv = 2;
hsd.Init.BusWide = SDIO_BUS_WIDE_1B;
if(HAL_SD_Init(&hsd)!= HAL_OK)
{
// Error handling
}
// ... existing code ...
}
FRESULT Mount_SD (const TCHAR* path)
{
fresult = f_mount(&fs, path, 1);
if (fresult != FR_OK)
{
Debug ("ERROR!!! in mounting SD CARD...");
}
else
{
// Success message
}
return fresult;
}
Functions initialize the SD card and handle mount/unmount operations of the file system. Configuration files are read from the SD card.
LoRa communication
Core/Src/LoRa.c LoRa newLoRa(){
LoRa new_LoRa;
new_LoRa.frequency = 433 ;
new_LoRa.spredingFactor = SF_7 ;
new_LoRa.bandWidth = BW_125KHz ;
new_LoRa.crcRate = CR_4_5 ;
new_LoRa.power = POWER_17db;
new_LoRa.overCurrentProtection = 100 ;
new_LoRa.preamble = 8 ;
return new_LoRa;
}
void LoRa_gotoMode(LoRa* _LoRa, int mode){
uint8_t read;
uint8_t data;
read = LoRa_read(_LoRa, RegOpMode);
data = read;
if(mode == SLEEP_MODE){
data = (read & 0xF8) | 0x00;
_LoRa->current_mode = SLEEP_MODE;
}else if (mode == STNBY_MODE){
data = (read & 0xF8) | 0x01;
_LoRa->current_mode = STNBY_MODE;
}else if (mode == TRANSMIT_MODE){
data = (read & 0xF8) | 0x03;
_LoRa->current_mode = TRANSMIT_MODE;
}else if (mode == RXCONTIN_MODE){
data = (read & 0xF8) | 0x05;
_LoRa->current_mode = RXCONTIN_MODE;
}else if (mode == RXSINGLE_MODE){
data = (read & 0xF8) | 0x06;
_LoRa->current_mode = RXSINGLE_MODE;
}
LoRa_write(_LoRa, RegOpMode, data);
}
Functions initialize and configure the LoRa module. They set parameters such as frequency, bandwidth, coding rate and output power.
BMP280 sensor data measurement
Core/Src/BMP280.c void ProcessBMPStateMachine()
{
switch (bmpState)
{
case BMP_INITIALIZE:
if((HAL_GetTick() - lastBMPSync) > DefaultTimeBMPFailSyncAfterMs)
{
if(bmp280_init(&bmp280, &bmp280.params))
{
bmpState = BMP_MESURMENT;
ErrorCount = 0;
lastBMPSync = HAL_GetTick();
}
else
{
if(debugBMP)
{
Debug("BMP280 initialization failed...");
}
if(ErrorCount >9)
bmpState = BMP_HW_RESET_REQUIRED;
else
ErrorCount++;
lastBMPSync = HAL_GetTick();
}
}
break;
case BMP_MESURMENT:
if(HAL_GetTick() - lastBMPSync > CheckTSensorsBMPAfterMS)
{
if(bmp280_force_measurement(&bmp280) == true)
{
bmpState = BMP_DATA_READY;
}
else
{
ErrorCount++;
lastBMPSync = HAL_GetTick();
}
}
break;
}
}
BMP280 state machine handles initialization, measurements and error handling. Depending on the state, appropriate operations are performed.
