flipperzero-firmware/applications/gui/u8g2_periphery.c

#include "u8g2/u8g2.h"
#include <furi.h>
#include <api-hal.h>

#include <main.h>

extern SPI_HandleTypeDef SPI_D;

// TODO: fix log
#ifdef DEBUG
#undef DEBUG
#endif

uint8_t u8g2_gpio_and_delay_stm32(u8x8_t* u8x8, uint8_t msg, uint8_t arg_int, void* arg_ptr) {
    switch(msg) {
    //Initialize SPI peripheral
    case U8X8_MSG_GPIO_AND_DELAY_INIT:
        /* HAL initialization contains all what we need so we can skip this part. */
        break;

    //Function which implements a delay, arg_int contains the amount of ms
    case U8X8_MSG_DELAY_MILLI:
        osDelay(arg_int);
        break;

    //Function which delays 10us
    case U8X8_MSG_DELAY_10MICRO:
        delay_us(10);
        break;

    //Function which delays 100ns
    case U8X8_MSG_DELAY_100NANO:
        asm("nop");
        break;

    // Function to define the logic level of the RESET line
    case U8X8_MSG_GPIO_RESET:
#ifdef DEBUG
        printf("[u8g2] rst %d\n", arg_int);
#endif

        // TODO change it to FuriRecord pin
        HAL_GPIO_WritePin(
            DISPLAY_RST_GPIO_Port, DISPLAY_RST_Pin, arg_int ? GPIO_PIN_SET : GPIO_PIN_RESET);
        break;

    default:
#ifdef DEBUG
        printf("[u8g2] unknown io %d\n", msg);
#endif

        return 0; //A message was received which is not implemented, return 0 to indicate an error
    }

    return 1; // command processed successfully.
}

uint8_t u8x8_hw_spi_stm32(u8x8_t* u8x8, uint8_t msg, uint8_t arg_int, void* arg_ptr) {
    switch(msg) {
    case U8X8_MSG_BYTE_SEND:
#ifdef DEBUG
        printf("[u8g2] send %d bytes %02X\n", arg_int, ((uint8_t*)arg_ptr)[0]);
#endif

        // TODO change it to FuriRecord SPI
        HAL_SPI_Transmit(&SPI_D, (uint8_t*)arg_ptr, arg_int, 10000);
        break;

    case U8X8_MSG_BYTE_SET_DC:
#ifdef DEBUG
        printf("[u8g2] dc %d\n", arg_int);
#endif

        // TODO change it to FuriRecord pin
        HAL_GPIO_WritePin(
            DISPLAY_DI_GPIO_Port, DISPLAY_DI_Pin, arg_int ? GPIO_PIN_SET : GPIO_PIN_RESET);
        break;

    case U8X8_MSG_BYTE_INIT:
#ifdef DEBUG
        printf("[u8g2] init\r\n");
#endif

        // TODO change it to FuriRecord pin
        HAL_GPIO_WritePin(DISPLAY_CS_GPIO_Port, DISPLAY_CS_Pin, GPIO_PIN_RESET);
        break;

    case U8X8_MSG_BYTE_START_TRANSFER:
#ifdef DEBUG
        printf("[u8g2] start\r\n");
#endif

        // TODO: SPI manager
        api_hal_spi_lock_device(&display_spi);

        // TODO change it to FuriRecord pin
        HAL_GPIO_WritePin(DISPLAY_CS_GPIO_Port, DISPLAY_CS_Pin, GPIO_PIN_RESET);
        asm("nop");
        break;

    case U8X8_MSG_BYTE_END_TRANSFER:
#ifdef DEBUG
        printf("[u8g2] end\r\n");
#endif

        asm("nop");
        // TODO change it to FuriRecord pin
        HAL_GPIO_WritePin(DISPLAY_CS_GPIO_Port, DISPLAY_CS_Pin, GPIO_PIN_SET);

        // TODO: SPI manager
        api_hal_spi_unlock_device(&display_spi);

        break;

    default:
#ifdef DEBUG
        printf("[u8g2] unknown xfer %d\n", msg);
#endif

        return 0;
    }

    return 1;
}