henriheimann / stm32-hal-pcd8544

Driver for the PCD8544 display driver using STM32Cube HAL

PCD8544

Driver for the PCD8544 display driver used in Nokia 5110 modules.

Usage

Connecting the PCD8544 driver to your microcontroller via an SPI (CPOL = Low, CPHA = 1 Edge) bus and the NSCE (Output, Pull-Down), DNC (Output, Pull-Down) and NRST (Output, Pull-Up) pins and initialise them using Cube. After doing so, you can use this library to interact with the driver as shown in the following example:

// Create the handle for the driver (Includes 504 byte of memory for the back buffer).
pcd8544_handle_t pcd8544_handle = {
        .spi_handle = &hspi1,
        .nsce_port = NOKIA5110_NSCE_GPIO_Port,
        .nsce_pin = NOKIA5110_NSCE_Pin,
        .dnc_port = NOKIA5110_DNC_GPIO_Port,
        .dnc_pin = NOKIA5110_DNC_Pin,
        .nrst_port = NOKIA5110_NRST_GPIO_Port,
        .nrst_pin = NOKIA5110_NRST_Pin,
};

// Initialise driver (performs basic setup and clears back buffer).
pcd8544_init(&pcd8544_handle);

// Set every second row to black (changes are only applied to back buffer).
for (uint8_t x = 0; x < PCD8544_LCD_WIDTH; x++) {
    for (uint8_t y = 0; y < PCD8544_LCD_HEIGHT; y++) {
        pcd8544_set_pixel(&pcd8544_handle, x, y, (pcd8544_color_t)(y % 2 == 0));   
    }
}

// Send back buffer to display.
pcd8544_update(&pcd8544_handle);

Supported Platforms

STM32L0 and STM32L4 are supported. The HAL header includes for other platforms may be added in pcd8544.h.