C++ (Cpp) max7456_send Examples

Example #1

File: max7456.c Project: Aeroprobing/Betaflight

void max7456_write_nvm(uint8_t char_address, uint8_t *font_data) {
    uint8_t x;

#ifdef MAX7456_DMA_CHANNEL_TX
    while (dma_transaction_in_progress);
#endif
    while (max7456_lock);
    max7456_lock = 1;
    ENABLE_MAX7456;

    // disable display
    max7456_send(VM0_REG, video_signal_type);

    max7456_send(MAX7456ADD_CMAH, char_address); // set start address high

    for(x = 0; x < 54; x++) {
        max7456_send(MAX7456ADD_CMAL, x); //set start address low
        max7456_send(MAX7456ADD_CMDI, font_data[x]);
#ifdef LED0_TOGGLE
        LED0_TOGGLE;
#else
        LED1_TOGGLE;
#endif
    }

    // transfer 54 bytes from shadow ram to NVM
    max7456_send(MAX7456ADD_CMM, WRITE_NVR);

    // wait until bit 5 in the status register returns to 0 (12ms)
    while ((max7456_send(MAX7456ADD_STAT, 0) & STATUS_REG_NVR_BUSY) != 0x00);

    max7456_send(VM0_REG, video_signal_type | 0x0C);
    DISABLE_MAX7456;
    max7456_lock = 0;
}

Example #2

File: max7456.c Project: Baymaxteam/betaflight

void max7456_draw_screen(void) {
    if (!max7456_lock) {
#ifdef MAX7456_DMA_CHANNEL_TX
        max7456_send_dma(max7456_screen, NULL, max_screen_size * 2 + 10);
#else
        uint16_t xx;
        max7456_lock = 1;

        ENABLE_MAX7456;
        max7456_send(MAX7456ADD_DMAH, 0);
        max7456_send(MAX7456ADD_DMAL, 0);
        max7456_send(MAX7456ADD_DMM, 1);
        for (xx = 0; xx < max_screen_size; ++xx) {
            max7456_send(MAX7456ADD_DMDI, SCREEN_BUFFER[xx]);
            SCREEN_BUFFER[xx] = MAX7456_CHAR(' ');
        }
        max7456_send(MAX7456ADD_DMDI, 0xFF);
        max7456_send(MAX7456ADD_DMM, 0);
        DISABLE_MAX7456;
        max7456_lock = 0;
#endif
    }
}

Example #3

File: max7456.c Project: Baymaxteam/betaflight

void max7456_init(uint8_t video_system)
{
    uint8_t max_screen_rows;
    uint8_t srdata = 0;
    uint16_t x;

#ifdef MAX7456_SPI_CS_PIN
    max7456CsPin = IOGetByTag(IO_TAG(MAX7456_SPI_CS_PIN));
#endif
    IOInit(max7456CsPin, OWNER_OSD, RESOURCE_SPI_CS, 0);
    IOConfigGPIO(max7456CsPin, SPI_IO_CS_CFG);

    //Minimum spi clock period for max7456 is 100ns (10Mhz)
    spiSetDivisor(MAX7456_SPI_INSTANCE, SPI_CLOCK_STANDARD);

    delay(1000);
    // force soft reset on Max7456
    ENABLE_MAX7456;
    max7456_send(VM0_REG, MAX7456_RESET);
    delay(100);

    srdata = max7456_send(0xA0, 0xFF);
    if ((0x01 & srdata) == 0x01) {     //PAL
          video_signal_type = VIDEO_MODE_PAL;
    }
    else if ((0x02 & srdata) == 0x02) { //NTSC
        video_signal_type = VIDEO_MODE_NTSC;
    }

    // Override detected type: 0-AUTO, 1-PAL, 2-NTSC
    switch(video_system) {
        case PAL:
            video_signal_type = VIDEO_MODE_PAL;
            break;
        case NTSC:
            video_signal_type = VIDEO_MODE_NTSC;
            break;
    }

    if (video_signal_type) { //PAL
        max_screen_size = VIDEO_BUFFER_CHARS_PAL;
        max_screen_rows = VIDEO_LINES_PAL;
    } else {                 // NTSC
        max_screen_size = VIDEO_BUFFER_CHARS_NTSC;
        max_screen_rows = VIDEO_LINES_NTSC;
    }

    // set all rows to same charactor black/white level
    for(x = 0; x < max_screen_rows; x++) {
        max7456_send(MAX7456ADD_RB0 + x, BWBRIGHTNESS);
    }

    // make sure the Max7456 is enabled
    max7456_send(VM0_REG, OSD_ENABLE | video_signal_type);

    DISABLE_MAX7456;
    delay(100);

    for (x = 0; x < max_screen_size; x++)
        SCREEN_BUFFER[x] = MAX7456_CHAR(' ');

#ifdef MAX7456_DMA_CHANNEL_TX
    max7456_screen[0] = (uint16_t)(MAX7456ADD_DMAH | (0 << 8));
    max7456_screen[1] = (uint16_t)(MAX7456ADD_DMAL | (0 << 8));
    max7456_screen[2] = (uint16_t)(MAX7456ADD_DMM | (1 << 8));
    max7456_screen[max_screen_size + 3] = (uint16_t)(MAX7456ADD_DMDI | (0xFF << 8));
    max7456_screen[max_screen_size + 4] = (uint16_t)(MAX7456ADD_DMM  | (0 << 8));

    dmaSetHandler(MAX7456_DMA_IRQ_HANDLER_ID, max7456_dma_irq_handler, NVIC_PRIO_MAX7456_DMA, 0);
#endif
}