问题描述
图形界面采用LVGL，显示驱动采用的是ST7789V+8080并口协议8位。
驱动部分都能正常显示LVGL的图形，但是颜色反转了。
例如：红色显示成蓝色
白色显示成黑色。
问题定位
开始怀疑是LVGL的反色显示打开了。
于是找到lvgl的配置文件lv_conf.h
#define LV_COLOR_16_SWAP 0
配置是关闭状态，显然，不关LVGL反色设置的问题。
在LVGL的显示驱动lv_port_disp.c这个文件，找到
那问题就来到了驱动部分。驱动部分最开始怀疑是颜色函数
static void disp_flush_cb(lv_disp_drv_t *disp, const lv_area_t *area,
lv_color_t *color_p) {
disp_drv_p = disp;
const lv_coord_t w = (area->x2 - area->x1 + 1);
const lv_coord_t h = (area->y2 - area->y1 + 1);
const uint32_t len = w * h;
HAL::Display_SetAddrWindow(area->x1, area->y1, area->x2, area->y2);
//HAL::Display_SendPixels((uint16_t*)color_p, len);
HAL::Display_SendPixelsByCoordinate((uint16_t*) color_p, len);
//通知LVGL准备刷新
lv_disp_flush_ready(disp);
}
void HAL::Display_SendPixelsByCoordinate(const uint16_t* pixels, uint32_t len) {
while(len--){
screen.pushColor(*(pixels++));
}
if(Disp_Callback)
{
Disp_Callback();
}
}
void Adafruit_ST7789_8080_8bit::pushColor(uint16_t color) {
writeData(color >> 8);
writeData(color);
}
怀疑是pushColor这个函数数据写入顺序问题。通过调整代码，调转了方向后，还是不行。
最后没办法。直接开驱动底层。
知道是反色相关的代码，所以找到ST7789的协议说明，搜索反色指令。
开始找了一通，并没有找到反色相关的指令。
按我的经验理解，默认应该是正常色。后来实在没办法。
就在初始化最后加上了反色关闭的指令，在没有报希望的情况下刷进板子试试。
反色关闭指令：writeCommand(0x20); （如果你的不行，可以试试writeCommand(0x21);打开反色）
结果立马显示正常了。
这个刷新我的认知，竟然默认是反色的，很是坑。
附赠ST7789指令说明
/*=========================ST7789V协议定义===========================*/
#define ST7789V_CMD_NOP (0x00) /* Empty command */
#define ST7789V_CMD_SWRESET (0x01) /* Software Reset */
#define ST7789V_CMD_RDDID (0x04) /* Read Display ID */
#define ST7789V_CMD_RDDST (0x09) /* Read Display Status */
#define ST7789V_CMD_RDDPM (0x0A) /* Read Display Power Mode */
#define ST7789V_CMD_RDDMADCTL (0x0B) /* Read Display MADCTL */
#define ST7789V_CMD_RDDCOLMOD (0x0C) /* Read Display Pixel Format */
#define ST7789V_CMD_RDDIM (0x0D) /* Read Display Image Mode */
#define ST7789V_CMD_RDDSM (0x0E) /* Read Display Signal Mode */
#define ST7789V_CMD_RDDSDR (0x0F) /* Read Display Self-Diagnostic Result */
#define ST7789V_CMD_SLPIN (0x10) /* Sleep in */
#define ST7789V_CMD_SLPOUT (0x11) /* Sleep Out */
#define ST7789V_CMD_PTLON (0x12) /* Partial Display Mode On */
#define ST7789V_CMD_NORON (0x13) /* Normal Display Mode On */
#define ST7789V_CMD_INVOFF (0x20) /* Display Inversion Off */
#define ST7789V_CMD_INVON (0x21) /* Display Inversion On */
#define ST7789V_CMD_GAMSET (0x26) /* Gamma Set */
#define ST7789V_CMD_DISPOFF (0x28) /* Display Off */
#define ST7789V_CMD_DISPON (0x29) /* Display On */
#define ST7789V_CMD_CASET (0x2A) /* Column Address Set */
#define ST7789V_CMD_RASET (0x2B) /* Row Address Set */
#define ST7789V_CMD_RAMWR (0x2C) /* Memory Write */
#define ST7789V_CMD_RAMRD (0x2E) /* Memory Read */
#define ST7789V_CMD_PTLAR (0x30) /* Partial Area */
#define ST7789V_CMD_VSCRDEF (0x33) /* Vertical Scrolling Definition */
#define ST7789V_CMD_TEOFF (0x34) /* Tearing Effect Line OFF */
#define ST7789V_CMD_TEON (0x35) /* Tearing Effect Line On */
#define ST7789V_CMD_MADCTL (0x36) /* Memory Data Access Control */
#define ST7789V_CMD_VSCSAD (0x37) /* Vertical Scroll Start Address of RAM */
#define ST7789V_CMD_IDMOFF (0x38) /* Idle Mode Off */
#define ST7789V_CMD_IDMON (0x39) /* Idle mode on */
#define ST7789V_CMD_COLMOD (0x3A) /* Interface Pixel Format */
#define ST7789V_CMD_WRMEMC (0x3C) /* Write Memory Continue */
#define ST7789V_CMD_RDMEMC (0x3E) /* Read Memory Continue */
#define ST7789V_CMD_STE (0x44) /* Set Tear Scanline */
#define ST7789V_CMD_GSCAN (0x45) /* Get Scanline */
#define ST7789V_CMD_WRDISBV (0x51) /* Write Display Brightness */
#define ST7789V_CMD_RDDISBV (0x52) /* Read Display Brightness Value */
#define ST7789V_CMD_WRCTRLD (0x53) /* Write CTRL Display */
#define ST7789V_CMD_RDCTRLD (0x54) /* Read CTRL Value Display */
#define ST7789V_CMD_WRCACE (0x55) /* Wr. Content Adaptive Brightness Control & Color Enhance */
#define ST7789V_CMD_RDCABC (0x56) /* Read Content Adaptive Brightness Control */
#define ST7789V_CMD_WRCABCMB (0x5E) /* Write CABC Minimum Brightness */
#define ST7789V_CMD_RDCABCMB (0x5F) /* Read CABC Minimum Brightness */
#define ST7789V_CMD_RDABCSDR (0x68) /* Read Automatic Brightness Control Self-Diagnostic Result */
#define ST7789V_CMD_RDID1 (0xDA) /* Read ID1 */
#define ST7789V_CMD_RDID2 (0xDB) /* Read ID2 */
#define ST7789V_CMD_RDID3 (0xDC) /* Read ID3 */
#define ST7789V_CMD_RAMCTRL (0xB0) /* RAM Control */
#define ST7789V_CMD_RGBCTRL (0xB1) /* RGB Interface Control */
#define ST7789V_CMD_PORCTRL (0xB2) /* Porch Setting */
#define ST7789V_CMD_FRCTRL1 (0xB3) /* Frame Rate Control 1 (In partial mode/ idle colors) */
#define ST7789V_CMD_PARCTRL (0xB5) /* Partial mode Control */
#define ST7789V_CMD_GCTRL (0xB7) /* Gate Control */
#define ST7789V_CMD_GTADJ (0xB8) /* Gate On Timing Adjustment */
#define ST7789V_CMD_DGMEN (0xBA) /* Digital Gamma Enable */
#define ST7789V_CMD_VCOMS (0xBB) /* VCOMS Setting */
#define ST7789V_CMD_LCMCTRL (0xC0) /* LCM Control */
#define ST7789V_CMD_IDSET (0xC1) /* ID Code Setting */
#define ST7789V_CMD_VDVVRHEN (0xC2) /* VDV and VRH Command Enable */
#define ST7789V_CMD_VRHS (0xC3) /* VRH Set */
#define ST7789V_CMD_VDVS (0xC4) /* VDV Set */
#define ST7789V_CMD_VCMOFSET (0xC5) /* VCOMS Offset Set */
#define ST7789V_CMD_FRCTRL2 (0xC6) /* Frame Rate Control in Normal Mode */
#define ST7789V_CMD_CABCCTRL (0xC7) /* CABC Control */
#define ST7789V_CMD_REGSEL1 (0xC8) /* Register Value Selection 1 */
#define ST7789V_CMD_REGSEL2 (0xCA) /* Register Value Selection 2 */
#define ST7789V_CMD_PWMFRSEL (0xCC) /* PWM Frequency Selection */
#define ST7789V_CMD_PWCTRL1 (0xD0) /* Power Control 1 */
#define ST7789V_CMD_VAPVANEN (0xD2) /* Enable VAP/VAN signal output */
#define ST7789V_CMD_CMD2EN (0xDF) /* Command 2 Enable */
#define ST7789V_CMD_PVGAMCTRL (0xE0) /* Positive Voltage Gamma Control */
#define ST7789V_CMD_NVGAMCTRL (0xE1) /* Negative Voltage Gamma Control */
#define ST7789V_CMD_DGMLUTR (0xE2) /* Digital Gamma Look-up Table for Red */
#define ST7789V_CMD_DGMLUTB (0xE3) /* Digital Gamma Look-up Table for Blue */
#define ST7789V_CMD_GATECTRL (0xE4) /* Gate Control */
#define ST7789V_CMD_SPI2EN (0xE7) /* SPI2 Enable */
#define ST7789V_CMD_PWCTRL2 (0xE8) /* Power Control 2 */
#define ST7789V_CMD_EQCTRL (0xE9) /* Equalize time control */
#define ST7789V_CMD_PROMCTRL (0xEC) /* Program Mode Control */
#define ST7789V_CMD_PROMEN (0xFA) /* Program Mode Enable */
#define ST7789V_CMD_NVMSET (0xFC) /* NVM Setting */
#define ST7789V_CMD_PROMACT (0xFE) /* Program action */
