织女星开发板通过SPI协议驱动ARDUINO LCD模块

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  • #1832
    123123
    参与者

    添加显示图片代码

    前面提到的那个Arduino LCD模块的网页里有图片提取软件,先利用这个工具把图片转换成16位的彩色数据,生成一个大数组的C文件,把这个数组复制到 lcd_fonts文件中,再在主函数中调用就可以了。
    根据屏幕刷新的部分改写了个显示图片的代码:
    void lcd_showimage(const unsigned char *p)
    {
    uint32_t i, cnt = 0;
    uint16_t data;
    uint8_t d1,d2;
    cnt = LCD_WIDTH * LCD_HEIGHT ;
    lcd_set_cursor(0, 0);
    lcd_write_byte(0x22, LCD_CMD);
    LCD_DC_SET();
    for (i = 0; i < cnt; i ++)
    {
    d1 = *p++;
    d2 = *p++;
    data = (uint16_t)d1+((uint16_t)d2<<8);
    LCD_WORD_WRITE(data);
    }
    }

    展示一下最终的成果:

    lcd显示图片

    #1833
    123123
    参与者

    代码的补充和优化

    优化

    以单个像素点来读取数据可能会有点慢,一次读取多个像素点能大大提高读取速度,但也有一些情况就是需要一次只读取一个像素点,所以我定义了一个宏HIGH_LEVEL_OPTIMIZE,来控制选择是否一次读取多个像素点:
    #if HIGH_LEVEL_OPTIMIZE
    static uint16_t LCD_MULTI_WORD_WRITE(uint16_t* data, uint16_t len)
    {
    uint8_t *transfer = (uint8_t*)malloc(len);
    lpspi_transfer_t masterXfer;
    if(transfer){
    uint8_t exist = len % 8; //copy 8 Byte one time
    uint32_t i = 0;
    for(;i<(len - exist);){ transfer[i++] = (*(data)) & 0xff; transfer[i++] = ((*(data++)) & 0xff00) >> 8;
    transfer[i++] = (*(data)) & 0xff;
    transfer[i++] = ((*(data++)) & 0xff00) >> 8;
    transfer[i++] = (*(data)) & 0xff;
    transfer[i++] = ((*(data++)) & 0xff00) >> 8;
    transfer[i++] = (*(data)) & 0xff;
    transfer[i++] = ((*(data++)) & 0xff00) >> 8;
    }
    for(int j=0;j<exist/2;j++){ transfer[i++] = (*(data)) & 0xff; transfer[i++] = ((*(data++)) & 0xff00) >> 8;
    }
    masterXfer.txData = transfer;
    masterXfer.rxData = NULL;
    masterXfer.dataSize = len;
    masterXfer.configFlags = BOARD_LPSPI_PCS_FOR_TRANSFER | kLPSPI_MasterPcsContinuous;
    LPSPI_MasterTransferBlocking(LCD_SPI, &masterXfer);
    free(transfer);
    transfer = NULL;
    }
    else{
    free(transfer);
    transfer = NULL;
    return -1;
    }
    return *data;
    }
    #endif

    修改lcd_clear_screen(uint16_t color)函数,代码如下:
    void lcd_clear_screen(uint16_t color)
    {
    uint32_t i, cnt = 0;
    cnt = LCD_WIDTH * LCD_HEIGHT;
    lcd_set_cursor(0, 0);
    lcd_write_byte(0x22, LCD_CMD);
    LCD_DC_SET();
    #if HIGH_LEVEL_OPTIMIZE
    const uint32_t nPixelSet = 32; //send n pixels one time
    uint16_t temp[nPixelSet];
    uint16_t color2send = INVERSE_MSB(color); //MSB first, need to convert the data
    for(int i=0;i<nPixelSet;){
    temp[i++] = color2send;
    temp[i++] = color2send;
    temp[i++] = color2send;
    temp[i++] = color2send;
    }
    /*** Send 64 Bytes one time, but the lcd will accept one 16-bit as a pixel,
    so the len will be the len of the (uint16), need to sizeof(temp)/sizeof(uint16_t);***/
    for (i = 0; i < cnt; i += nPixelSet)
    {
    LCD_MULTI_WORD_WRITE(temp, sizeof(temp));
    }
    #else
    /**** send 2 bytes one time***/
    for (i = 0; i < cnt; i ++)
    {
    LCD_WORD_WRITE(color);
    }
    #endif
    }

    显示图片部分的代码也是通过类似的方法来优化。

    补充

    一楼显示的配置SPI的代码看起来有点乱,我想修改的时候已经不能编辑了,在这里重新写一遍:
    static uint8_t lcd_hardware_init(void)
    {
    lpspi_master_config_t masterConfig;
    uint32_t srcClock_Hz;
    /* SPI init */
    LPSPI_MasterGetDefaultConfig(&masterConfig);
    /*********Master config*********/
    masterConfig.baudRate = 24000000;
    /* 这里LPSPI_TRANSFER_SIZE的值在宏定义中设置为1 */
    masterConfig.bitsPerFrame = 8*LPSPI_TRANSFER_SIZE;
    masterConfig.cpol = kLPSPI_ClockPolarityActiveHigh;
    masterConfig.cpha = kLPSPI_ClockPhaseFirstEdge;
    masterConfig.direction = kLPSPI_MsbFirst;
    masterConfig.pcsToSckDelayInNanoSec = 1000000000 / masterConfig.baudRate;
    masterConfig.lastSckToPcsDelayInNanoSec = 1000000000 / masterConfig.baudRate;
    masterConfig.betweenTransferDelayInNanoSec = 1000000000 / masterConfig.baudRate;
    /* 设置pcs2为片选信号 */
    masterConfig.whichPcs = kLPSPI_Pcs2;
    masterConfig.pcsActiveHighOrLow = kLPSPI_PcsActiveLow;
    masterConfig.pinCfg = kLPSPI_SdiInSdoOut;
    masterConfig.dataOutConfig = kLpspiDataOutRetained;
    srcClock_Hz = CLOCK_GetIpFreq(kCLOCK_Lpspi0);
    LPSPI_MasterInit(LCD_SPI, &masterConfig, srcClock_Hz);
    return true;
    }

     

    #1836
    HowardHoward
    参与者

    @123 加油继续!

    #1841
    west_windwest_wind
    参与者

    学习了。

    #1843
    solo2pmsolo2pm
    参与者

    这个好,赞一个

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