2.0" 320x240 Color IPS TFT using ST7789 on STM32U5 without HAL

[Falconfighter23]

Hey, 

I am trying to find drivers for a 320x240 adafruit display that work on the STM32U5 without using the HAL. I cannot seem to find anyone who has a ST7789 driver that does not use the HAL. Have any of you used the ST7789 with the STM32U5? Any help would be appreciated. Thanks.

[liaifat85]

You can try this way:

#define ST7789_DC_PIN     // Define as per your setup
#define ST7789_CS_PIN     // Define as per your setup

void spi_init(void) {
    // Configure SPI registers for STM32U5
}

void st7789_writeCommand(uint8_t cmd) {
    // Set D/C pin to low for command
    GPIO_WritePin(ST7789_DC_PIN, GPIO_PIN_RESET);
    // Pull CS low to select the device
    GPIO_WritePin(ST7789_CS_PIN, GPIO_PIN_RESET);
    // Write command over SPI
    SPI_WriteData(cmd);
    // Pull CS high to release the device
    GPIO_WritePin(ST7789_CS_PIN, GPIO_PIN_SET);
}

void st7789_writeData(uint8_t data) {
    // Set D/C pin high for data
    GPIO_WritePin(ST7789_DC_PIN, GPIO_PIN_SET);
    // Pull CS low to select the device
    GPIO_WritePin(ST7789_CS_PIN, GPIO_PIN_RESET);
    // Write data over SPI
    SPI_WriteData(data);
    // Pull CS high to release the device
    GPIO_WritePin(ST7789_CS_PIN, GPIO_PIN_SET);
}

void st7789_init(void) {
    st7789_writeCommand(0x01); // Software Reset
    delay_ms(150);
    st7789_writeCommand(0x11); // Sleep Out
    delay_ms(500);
    st7789_writeCommand(0x3A); // Set Color Mode
    st7789_writeData(0x55);    // 16-bit color
    st7789_writeCommand(0x29); // Display On
}

[Andrew Neil]

Why does it matter what the library uses internally?

[Andrew Neil]

You missed the "does not use HAL" requirement, then!

[Falconfighter23]

The project I am working on is done without the HAL and I have not ever used the HAL. It would be very difficult to edit the whole project to work with the HAL.