gpiofd_write(resetIO, 1);    usleep(50000);    gpiofd_write(resetIO, 0);    usleep(100000);    gpiofd_write(resetIO, 1);    usleep(100000);

 st7789s晶片是分大小端的,當使用RGB16位方式傳送資料時要注意傳送資料的大小端問題

send_ctrl_cmd(0x11);     usleep(120000);

    send_ctrl_cmd(0x36);     send_data_cmd(0x00);//更改顯示方式

    send_ctrl_cmd(0x3a);     send_data_cmd(0x06);//更改rgb顏色為多少位

    send_ctrl_cmd(0xb0);     send_data_cmd(0xa0);//06

    send_ctrl_cmd(0xb2);     send_data_cmd(0x28);     send_data_cmd(0x28);     send_data_cmd(0x05);     send_data_cmd(0x33);     send_data_cmd(0x33);

    send_ctrl_cmd(0xb7);     send_data_cmd(0x35);

    send_ctrl_cmd(0xbb);     send_data_cmd(0x3c);//23

    send_ctrl_cmd(0xb1);     send_data_cmd(0x80);     send_data_cmd(0x10);

    send_ctrl_cmd(0xc0);     send_data_cmd(0x2c);

    send_ctrl_cmd(0xc2);     send_data_cmd(0x01);

    send_ctrl_cmd(0xc3);     send_data_cmd(0x05);//14

    send_ctrl_cmd(0xc4);     send_data_cmd(0x20);

    send_ctrl_cmd(0xc6);     send_data_cmd(0x14); // 14

    send_ctrl_cmd(0xd0);     send_data_cmd(0xa4);     send_data_cmd(0xa1);

    send_ctrl_cmd(0xe0);     send_data_cmd(0xd0);     send_data_cmd(0x00);     send_data_cmd(0x02);     send_data_cmd(0x07);     send_data_cmd(0x07);     send_data_cmd(0x19);     send_data_cmd(0x2e);     send_data_cmd(0x54);     send_data_cmd(0x41);     send_data_cmd(0x2d);     send_data_cmd(0x17);     send_data_cmd(0x18);     send_data_cmd(0x14);     send_data_cmd(0x18);

    send_ctrl_cmd(0xe1);     send_data_cmd(0xd0);     send_data_cmd(0x00);     send_data_cmd(0x02);     send_data_cmd(0x07);     send_data_cmd(0x04);     send_data_cmd(0x24);     send_data_cmd(0x2c);     send_data_cmd(0x44);     send_data_cmd(0x42);     send_data_cmd(0x1c);     send_data_cmd(0x1a);     send_data_cmd(0x17);     send_data_cmd(0x15);     send_data_cmd(0x18);     send_ctrl_cmd(0x35);     send_data_cmd(0x00);//40

    send_ctrl_cmd(0x44);     send_data_cmd(0x19);     send_ctrl_cmd(0x29);

********************************清屏程式碼,把螢幕全部刷成一個色判斷驅動是否有問題**********************

static void sw_clear_panel(unsigned int color) {    unsigned short x0, y0, x1, y1, x, y;    unsigned short h_X_start,l_X_start,h_X_end,l_X_end,h_Y_start,l_Y_start,h_Y_end,l_Y_end;

   x0 = (unsigned short)0;    y0 = (unsigned short)0;    x1 = (unsigned short)FRAME_WIDTH-1;    y1 = (unsigned short)FRAME_HEIGHT-1;

   h_X_start=((x0&0xFF00)>>8);    l_X_start=(x0&0x00FF);    h_X_end=((x1&0xFF00)>>8);    l_X_end=(x1&0x00FF);

   h_Y_start=((y0&0xFF00)>>8);    l_Y_start=(y0&0x00FF);    h_Y_end=((y1&0xFF00)>>8);    l_Y_end=(y1&0x00FF);

   send_ctrl_cmd(0x2A);    send_data_cmd(h_X_start);    send_data_cmd(l_X_start);    send_data_cmd(h_X_end);    send_data_cmd(l_X_end);

   send_ctrl_cmd(0x2B);    send_data_cmd(h_Y_start);    send_data_cmd(l_Y_start);    send_data_cmd(h_Y_end);    send_data_cmd(l_Y_end);

   send_ctrl_cmd(0x29);    send_ctrl_cmd(0x2C);

   for (y = y0; y <= y1; ++ y) {       for (x = x0; x <= x1; ++ x) {   //採用了RGB24位的資料,所以傳送三次 

         send_data_cmd(0xff);          send_data_cmd(0);          send_data_cmd(0);

      }    }

}

我使用這個2.8寸的螢幕有IO引腳控制傳送的是資料還是命令給主控晶片,所以在傳送時候要注意在主控晶片控制命令和資料引腳的高低電平

VOID send_ctrl_cmd (UCHAR cmd) {

    gpiofd_write(cmdDataIO, 0);

    lib_bzero(&spiMsg, sizeof(spiMsg));     spiMsg.SPIMSG_pucRdBuffer =pucDestBuffer;     spiMsg.SPIMSG_pucWrBuffer =  &cmd;     spiMsg.SPIMSG_uiLen       = 1;     if (API_SpiDeviceTransfer(pSpiDevice, &spiMsg, 1) != 1) {         printf("failed to spi transfer!\n");         API_SpiDeviceDelete(pSpiDevice);         API_VmmDmaFree(pucSrcBuffer);         return;     }     gpiofd_write(cmdDataIO, 1);

}

VOID send_data_cmd (UCHAR data) {

    gpiofd_write(cmdDataIO, 1);

    lib_bzero(&spiMsg, sizeof(spiMsg));     spiMsg.SPIMSG_pucRdBuffer = pucDestBuffer;     spiMsg.SPIMSG_pucWrBuffer = &data;     spiMsg.SPIMSG_uiLen       = 1;

    if (API_SpiDeviceTransfer(pSpiDevice, &spiMsg, 1) != 1) {         printf("failed to spi transfer!\n");         API_SpiDeviceDelete(pSpiDevice);         API_VmmDmaFree(pucSrcBuffer);         return;     }

    gpiofd_write(cmdDataIO, 0);

}