一. 前言
前面系列文章我们分享了ST7789和GC9A01A的驱动,并移植了LVGL和emWin跑了Demo。LVGL本身支持多显示器，刚好手里也有多块基于GC9A01A的1.28寸圆屏,这一篇我们就在之前的基础上演示LVGL的多屏显示。
二. 驱动修改
前面我们分享LVGL移植时可以看到，显示驱动移植就是根据模板实现用户自己的显示函数即可，然后注册对应的驱动。对于显示器驱动可能用的一套底层驱动使用id区分不同显示器，也可能是完全不同的驱动，不管是什么方式，对于LVGL只需要注册多个驱动即可，一个驱动对应一个显示器。
我们的1.28寸屏使用SPI驱动，为了减少引脚使用所以两个屏幕共用DI，CLK和DC三个引脚，CS和RST两个屏幕独立使用，所以一共7个引脚，采用分时刷屏方式。所以驱动也只需要在原来的基础上稍微修改，接口中增加一个ID参数用于区分显示器即可。
gc9a01a_itf.h/c相应的接口中，增加ID参数用于区分显示屏，相应的增加gc9a01a设备实例，和CS，RST等控制接口区分，修改后内容如下
gc9a01a_itf.h
extern "C"{/*** \fn gc9a01a_itf_init* 初始化* \retval 0 成功* \retval 其他值 失败*/int gc9a01a_itf_init(void);/*** \fn gc9a01a_itf_deinit* 解除初始化* \retval 0 成功* \retval 其他值 失败*/int gc9a01a_itf_deinit(void);/*** \fn gc9a01a_itf_sync* 刷新显示* \param[in] id 设备索引* \retval 0 成功* \retval 其他值 失败*/int gc9a01a_itf_sync(int id);/*** \fn gc9a01a_itf_set_pixel* 写点* \param[in] id 设备索引* \param[in] x x坐标位置* \param[in] y y坐标位置* \param[in] rgb565 颜色*/void gc9a01a_itf_set_pixel(int id, uint16_t x, uint16_t y, uint16_t rgb565);/*** \fn gc9a01a_itf_get_pixel* 读点* \param[in] id 设备索引* \param[in] x x坐标位置* \param[in] y y坐标位置* \return rgb565颜色*/uint16_t gc9a01a_itf_get_pixel(int id, uint16_t x, uint16_t y);}
gc9a01a_itf.c
/******************************************************************************* 以下是底层适配*******************************************************************************//* 使用IO模拟SPI方式 */static void port_io_spi_cs_write(uint8_t val){(void)val;}static void port_gc9a01a_spi_enable1(uint8_t val){if(val){gpio_write(CS1_PIN,0);}else{gpio_write(CS1_PIN,1);}}static void port_gc9a01a_spi_enable2(uint8_t val){if(val){gpio_write(CS2_PIN,0);}else{gpio_write(CS2_PIN,1);}}static void port_io_spi_sck_write(uint8_t val){gpio_write(SCL_PIN,val);}static void port_io_spi_mosi_write(uint8_t val){gpio_write(SDA_PIN,val);}static uint8_t port_io_spi_miso_read(void){return 0;}static void port_io_spi_init(void){gpio_open(CS1_PIN, GPIO_DIRECTION_OUTPUT);gpio_set_pull_mode(CS1_PIN, GPIO_PULL_UP);gpio_write(CS1_PIN,1);gpio_open(CS2_PIN, GPIO_DIRECTION_OUTPUT);gpio_set_pull_mode(CS2_PIN, GPIO_PULL_UP);gpio_write(CS2_PIN,1);gpio_open(SCL_PIN, GPIO_DIRECTION_OUTPUT);gpio_set_pull_mode(SCL_PIN, GPIO_PULL_UP);gpio_write(SCL_PIN,1);gpio_open(SDA_PIN, GPIO_DIRECTION_OUTPUT);gpio_set_pull_mode(SDA_PIN, GPIO_PULL_UP);gpio_write(SDA_PIN,1);if(RST1_PIN < GPIO_INVALID){gpio_open(RST1_PIN, GPIO_DIRECTION_OUTPUT);gpio_set_pull_mode(RST1_PIN, GPIO_PULL_UP);gpio_write(RST1_PIN,1);}if(RST2_PIN < GPIO_INVALID){gpio_open(RST2_PIN, GPIO_DIRECTION_OUTPUT);gpio_set_pull_mode(RST2_PIN, GPIO_PULL_UP);gpio_write(RST2_PIN,1);}}static void port_io_spi_deinit(void){gpio_close(CS1_PIN);gpio_close(CS2_PIN);gpio_close(SCL_PIN);gpio_close(SDA_PIN);}/* IO模拟SPI设备实例 */static io_spi_dev_st s_io_spi_dev ={.cs_write = port_io_spi_cs_write,.sck_write = port_io_spi_sck_write,.mosi_write = port_io_spi_mosi_write,.miso_read = port_io_spi_miso_read,.delay_pf = 0,.init = port_io_spi_init,.deinit = port_io_spi_deinit,.delayns = 1,.mode = 0,.msb = 1,};static void port_gc9a01a_set_dcx(uint8_t val){gpio_write(DC_PIN, val);}static void port_gc9a01a_set_reset1(uint8_t val){(void)val;if(RST1_PIN < GPIO_INVALID){gpio_write(RST1_PIN, val);}}static void port_gc9a01a_set_reset2(uint8_t val){(void)val;if(RST2_PIN < GPIO_INVALID){gpio_write(RST2_PIN, val);}}static void port_gc9a01a_spi_write(uint8_t* buffer, uint32_t len){io_spi_trans(&s_io_spi_dev, buffer, 0, len);}static void port_gc9a01a_delay_ms(uint32_t t){if(t > 0){os_delay(t);}}static void port_gc9a01a_init(void){gpio_open(DC_PIN, GPIO_DIRECTION_OUTPUT);gpio_set_pull_mode(DC_PIN, GPIO_PULL_UP);gpio_write(DC_PIN,1);io_spi_init(&s_io_spi_dev);}static void port_gc9a01a_deinit(void){gpio_close(DC_PIN);io_spi_deinit(&s_io_spi_dev);}/* 使用硬件SPI方式 */static void port_gc9a01a_set_dcx(uint8_t val){gpio_write(DC_PIN, val);}static void port_gc9a01a_set_reset1(uint8_t val){(void)val;if(RST1_PIN < GPIO_INVALID){gpio_write(RST1_PIN, val);}}static void port_gc9a01a_set_reset2(uint8_t val){(void)val;if(RST2_PIN < GPIO_INVALID){gpio_write(RST2_PIN, val);}}volatile uint32_t s_gc9a01a_spi_busy_flag = 0;static void spi_dma_cb(void){//printf("spi done\r\n");s_gc9a01a_spi_busy_flag = 0;//timer_delay_us(2);}static void port_gc9a01a_spi_write(uint8_t* buffer, uint32_t len){RET ret;int timeout;if(len < 100){timeout = 2; /* 数据比较少时,是在发命令,最多等2ms */}else{timeout = 200; /* 数据比较多时肯定是在刷屏,最多等200mS */}s_gc9a01a_spi_busy_flag = 1;if(RET_OK != (ret = spi_dma_trans_direct(USE_SPI_PORT, buffer, 0, len, spi_dma_cb))){printf("spi err %d\r\n", ret);s_gc9a01a_spi_busy_flag = 0;return;}/* 等待传输完成，由于一个SPI多CS分时，所以必须阻塞等一次传完，才能进行下一次 */while(s_gc9a01a_spi_busy_flag != 0){os_delay(1); /* 释放CPU */timeout--;if(timeout <= 0){s_gc9a01a_spi_busy_flag = 0;printf("spi busy\r\n");return;}}}static void port_gc9a01a_spi_enable1(uint8_t val){if(val){gpio_write(CS1_PIN,0);}else{gpio_write(CS1_PIN,1);}}static void port_gc9a01a_spi_enable2(uint8_t val){if(val){gpio_write(CS2_PIN,0);}else{gpio_write(CS2_PIN,1);}}static void port_gc9a01a_delay_ms(uint32_t t){os_delay(t);}static void port_gc9a01a_init(void){static int s_port_gc9a01a_init_flag = 0;if(s_port_gc9a01a_init_flag == 0){/* 共用，底层接口只需要初始化一次 */s_port_gc9a01a_init_flag = 1;gpio_open(DC_PIN, GPIO_DIRECTION_OUTPUT);gpio_set_pull_mode(DC_PIN, GPIO_PULL_UP);gpio_write(DC_PIN,1);gpio_open(GPIO_PMM00, GPIO_DIRECTION_OUTPUT);gpio_set_pull_mode(GPIO_PMM00, GPIO_PULL_UP);gpio_write(GPIO_PMM00,1);gpio_open(GPIO_PMM01, GPIO_DIRECTION_OUTPUT);gpio_set_pull_mode(GPIO_PMM01, GPIO_PULL_UP);gpio_write(GPIO_PMM01,1);gpio_open(CS1_PIN, GPIO_DIRECTION_OUTPUT);gpio_set_pull_mode(CS1_PIN, GPIO_PULL_UP);gpio_write(CS1_PIN,1);gpio_open(CS2_PIN, GPIO_DIRECTION_OUTPUT);gpio_set_pull_mode(CS2_PIN, GPIO_PULL_UP);gpio_write(CS2_PIN,1);if(RST1_PIN < GPIO_INVALID){gpio_open(RST1_PIN, GPIO_DIRECTION_OUTPUT);gpio_set_pull_mode(RST1_PIN, GPIO_PULL_UP);gpio_write(RST1_PIN,1);}if(RST2_PIN < GPIO_INVALID){gpio_open(RST2_PIN, GPIO_DIRECTION_OUTPUT);gpio_set_pull_mode(RST2_PIN, GPIO_PULL_UP);gpio_write(RST2_PIN,1);}printf("io init\r\n");/* SPI配置 */spi_cfg_t spi_cfg;spi_gpio_cfg_t gpio_cfg;spi_cfg.frequency = 80ul * 1000ul * 1000ul; // SPI时钟源是350M，在此基础上再分频。本TFT支持最大100M. 设置60M实际是350/6=58.3MHzgpio_cfg.auto_cs = false;gpio_cfg.cs = GPIO_INVALID;gpio_cfg.clk = SCL_PIN;gpio_cfg.miso = GPIO_INVALID;gpio_cfg.mosi = SDA_PIN;//if((gpio_cfg.auto_cs == false) && (gpio_cfg.cs < GPIO_INVALID))//{// gpio_open(gpio_cfg.cs, GPIO_DIRECTION_OUTPUT);// gpio_set_pull_mode(gpio_cfg.cs, GPIO_PULL_UP);//}RET ret;if(RET_OK != (ret = spi_init(USE_SPI_PORT))){printf("spi init err %d\r\n", ret);}if(RET_OK != (ret = spi_open(USE_SPI_PORT, &spi_cfg, &gpio_cfg))){printf("spi open err %d\r\n", ret);}spi_modify_CPOL_CPHA(USE_SPI_PORT, SPI_CLK_MODE_0);printf("spi init\r\n");}}static void port_gc9a01a_deinit(void){gpio_close(DC_PIN);if(RST1_PIN < GPIO_INVALID){gpio_close(RST1_PIN);}if(RST2_PIN < GPIO_INVALID){gpio_close(RST2_PIN);}spi_close(USE_SPI_PORT);}/******************************************************************************* 以下是GC9A01A设备实例*******************************************************************************/static uint16_t s_gc9a01a_itf_buffer[2][GC9A01A_HSIZE][GC9A01A_VSIZE]; /**< 显存 *//* 设备实例 */static gc9a01a_dev_st s_gc9a01a_itf_dev1 ={.set_dcx = port_gc9a01a_set_dcx,.set_reset = port_gc9a01a_set_reset1,.write = port_gc9a01a_spi_write,.enable = port_gc9a01a_spi_enable1,.delay = port_gc9a01a_delay_ms,.init = port_gc9a01a_init,.deinit = port_gc9a01a_deinit,.buffer = (uint16_t*)(s_gc9a01a_itf_buffer[0]),};/* 设备实例 */static gc9a01a_dev_st s_gc9a01a_itf_dev2 ={.set_dcx = port_gc9a01a_set_dcx,.set_reset = port_gc9a01a_set_reset2,.write = port_gc9a01a_spi_write,.enable = port_gc9a01a_spi_enable2,.delay = port_gc9a01a_delay_ms,.init = port_gc9a01a_init,.deinit = port_gc9a01a_deinit,.buffer = (uint16_t*)(s_gc9a01a_itf_buffer[1]),};/******************************************************************************* 以下是对外操作接口*******************************************************************************//*** \fn gc9a01a_itf_init* 初始化* \retval 0 成功* \retval 其他值 失败*/int gc9a01a_itf_init(void){gpio_open(DC_PIN, GPIO_DIRECTION_OUTPUT);gpio_set_pull_mode(DC_PIN, GPIO_PULL_UP);gpio_write(DC_PIN,1);gpio_open(CS_PIN, GPIO_DIRECTION_OUTPUT);gpio_set_pull_mode(CS_PIN, GPIO_PULL_UP);gpio_write(CS_PIN,1);gpio_open(SCL_PIN, GPIO_DIRECTION_OUTPUT);gpio_set_pull_mode(SCL_PIN, GPIO_PULL_UP);gpio_write(SCL_PIN,1);gpio_open(SDA_PIN, GPIO_DIRECTION_OUTPUT);gpio_set_pull_mode(SDA_PIN, GPIO_PULL_UP);gpio_write(SDA_PIN,1);while(1){static int s_cnt = 0;if(s_cnt%1 == 0){gpio_toggle(DC_PIN);}if(s_cnt%2 == 1){gpio_toggle(CS_PIN);}if(s_cnt%4 == 2){gpio_toggle(SCL_PIN);}if(s_cnt%8 == 3){gpio_toggle(SDA_PIN);}os_delay(1);s_cnt++;}static int s_gc9a01a_init_flag = 0;if(s_gc9a01a_init_flag == 0){s_gc9a01a_init_flag = 1; /* 只初始化一次 */gc9a01a_init(&s_gc9a01a_itf_dev1);gc9a01a_init(&s_gc9a01a_itf_dev2);}return 0;}/*** \fn gc9a01a_itf_deinit* 解除初始化* \retval 0 成功* \retval 其他值 失败*/int gc9a01a_itf_deinit(void){gc9a01a_deinit(&s_gc9a01a_itf_dev1);gc9a01a_deinit(&s_gc9a01a_itf_dev2);return 0;}/*** \fn gc9a01a_itf_sync* 刷新显示* \param[in] id 设备索引* \retval 0 成功* \retval 其他值 失败*/int gc9a01a_itf_sync(int id){if(id == 0){gc9a01a_sync(&s_gc9a01a_itf_dev1, 0, GC9A01A_HSIZE-1, 0, GC9A01A_VSIZE-1, s_gc9a01a_itf_dev1.buffer, GC9A01A_HSIZE*GC9A01A_VSIZE*2);return 0;}else if(id == 1){gc9a01a_sync(&s_gc9a01a_itf_dev2, 0, GC9A01A_HSIZE-1, 0, GC9A01A_VSIZE-1, s_gc9a01a_itf_dev2.buffer, GC9A01A_HSIZE*GC9A01A_VSIZE*2);return 0;}return -1;}/*** \fn gc9a01a_itf_set_pixel* 写点* \param[in] id 设备索引* \param[in] x x坐标位置* \param[in] y y坐标位置* \param[in] rgb565 颜色*/void gc9a01a_itf_set_pixel(int id, uint16_t x, uint16_t y, uint16_t rgb565){//if(x >= GC9A01A_HSIZE)//{// return -1;//}//if(y >= GC9A01A_VSIZE)//{// return -1;//}if(id == 0){s_gc9a01a_itf_dev1.buffer[y*GC9A01A_HSIZE + x] = (uint16_t)((rgb565>>8)&0xFF) | (uint16_t)((rgb565<<8) & 0xFF00);}else if(id == 1){s_gc9a01a_itf_dev2.buffer[y*GC9A01A_HSIZE + x] = (uint16_t)((rgb565>>8)&0xFF) | (uint16_t)((rgb565<<8) & 0xFF00);}}/*** \fn gc9a01a_itf_get_pixel* 读点* \param[in] id 设备索引* \param[in] x x坐标位置* \param[in] y y坐标位置* \return rgb565颜色*/uint16_t gc9a01a_itf_get_pixel(int id, uint16_t x, uint16_t y){if(id == 0){uint16_t color = s_gc9a01a_itf_dev1.buffer[y*GC9A01A_HSIZE + x];return ((uint16_t)(color>>8) | (uint16_t)(color<<8));}else if(id == 1){uint16_t color = s_gc9a01a_itf_dev2.buffer[y*GC9A01A_HSIZE + x];return ((uint16_t)(color>>8) | (uint16_t)(color<<8));}return 0;}
gc9a01a_test.h/c也相应的增加两个屏幕的测试，修改后内容如下
gc9a01a_test.h
extern "C"{int gc9a01a_test(void);}
gc9a01a_test.c
static void rgb_test(void){for(int x=0;x<GC9A01A_HSIZE;x++){for(int y=0;y<GC9A01A_VSIZE;y++){gc9a01a_itf_set_pixel(0,x, y, 0xF800);gc9a01a_itf_set_pixel(1,x, y, 0xF800);}}gc9a01a_itf_sync(0);gc9a01a_itf_sync(1);os_delay(1000);for(int x=0;x<GC9A01A_HSIZE;x++){for(int y=0;y<GC9A01A_VSIZE;y++){gc9a01a_itf_set_pixel(0,x, y, 0x07E0);gc9a01a_itf_set_pixel(1,x, y, 0x07E0);}}gc9a01a_itf_sync(0);gc9a01a_itf_sync(1);os_delay(1000);for(int x=0;x<GC9A01A_HSIZE;x++){for(int y=0;y<GC9A01A_VSIZE;y++){gc9a01a_itf_set_pixel(0,x, y, 0x001F);gc9a01a_itf_set_pixel(1,x, y, 0x001F);}}gc9a01a_itf_sync(0);gc9a01a_itf_sync(1);os_delay(1000);}int gc9a01a_test(void){printf("gc9a01a test\r\n");gc9a01a_itf_init();rgb_test();uint32_t start;uint32_t end;uint32_t ftime = 0;while(0){start = timer_get_time();for(int i=0;i<10;i++){gc9a01a_itf_sync(0);gc9a01a_itf_sync(1);}end = timer_get_time();ftime = (end - start);uint32_t fps = (ftime*2+100)/(100*2); /* 刷新一次的时间uS */if(fps > 0){printf("FPS:%d\r\n",1000000/fps);}else{printf("FPS:%d\r\n",0);}}return 0;}
Gc9a01a.c/h不需要变化，内容如下
gc9a01a.c
/*** \struct gc9a01a_cmd_st* 命令结构体*/typedef struct{uint8_t cmd; /**< 命令 */uint8_t data[12]; /**< 参数,最多5个参数 */uint8_t datalen; /**< 参数长度 */uint16_t delay; /**< 延时时间 */} gc9a01a_cmd_st;static gc9a01a_cmd_st s_gc9a01a_cmd_init_list[]={///{0xEF,{0},0,0},///{0xEB,{0x14},1,0},/* 很多寄存器访问都需要Inter_command为高(默认为低)所以先发FE和EF配置Inter_command为高 */{GC9A01A_CMD_IRE1,{0},0,0},{GC9A01A_CMD_IRE2,{0},0,0},{0xEB,{0x14},1,0},{0x84,{0x40},1,0},{0x85,{0xFF},1,0},{0x86,{0xFF},1,0},{0x87,{0xFF},1,0},{0x88,{0x0A},1,0},{0x89,{0x21},1,0},{0x8A,{0x00},1,0},{0x8B,{0x80},1,0},{0x8C,{0x01},1,0},{0x8D,{0x01},1,0},{0x8E,{0xFF},1,0},{0x8F,{0xFF},1,0},/* 设置GS SS* 第一个参数为0,第二个参数有效* GS bit6 0:G1->G32 1:G32->G1* SS bit5 0:S1->S360 1:S360->S1*/{GC9A01A_CMD_DFC,{0x00,0x20},2,0},/*** Memory Access Control* 7 6 5 4 3 2 1 0* MY MX MV ML BGR MH 0 0* Y反转 X反转 XY交换 垂直刷新方向 0-RGB 水平刷新方向* 1-BGR*/{GC9A01A_CMD_MADCTL,{0x08},1,0},/* Pixel Format Set*7 【6 5 4】 3 【2 1 0】* DPI DBI* RGB接口 MCU接口* 101 16位 011 12位* 110 18位 101 16位* 110 18位*/{GC9A01A_CMD_COLMOD,{0x55},1,0},{0x90,{0x08,0x08,0x08,0x08},4,0},{0xBD,{0x06},1,0},{0xBC,{0x00},1,0},{0xFF,{0x60,0x01,0x04},3,0},/* 电源控制 */{GC9A01A_CMD_PC2,{0x13},1,0}, //vbp{GC9A01A_CMD_PC3,{0x13},1,0}, //vbn{GC9A01A_CMD_PC4,{0x22},1,0}, //vrh{0xBE,{0x11},1,0},{0xE1,{0x10,0x0E},2,0},{0xDF,{0x21,0x0C,0x02},3,0},/* 设置gamma曲线 */{GC9A01A_CMD_SETGAMMA1,{0x45,0x09,0x08,0x08,0x26,0x2A},6,0}, //默认值 80 03 08 06 05 2B{GC9A01A_CMD_SETGAMMA2,{0x43,0x70,0x72,0x36,0x37,0x6F},6,0}, //默认值 41 97 98 13 17 CD{GC9A01A_CMD_SETGAMMA3,{0x45,0x09,0x08,0x08,0x26,0x2A},6,0}, //默认值 40 03 08 0B 08 2E{GC9A01A_CMD_SETGAMMA3,{0x43,0x70,0x72,0x36,0x37,0x6F},6,0}, //默认值 3F 98 B4 14 18 CD{0xED,{0x1B,0x0B},2,0},{0xAE,{0x77},1,0},{0xED,{0x1B,0x0B},2,0},{0xCD,{0x63},1,0},{0x70,{0x07,0x07,0x04,0x0E,0x0F,0x09,0x07,0x08,0x03},9,0},{0xEB,{0x34},1,0},{0x62,{0x18,0x0D,0x71,0xED,0x70,0x70,0x18,0x0F,0x71,0xEF,0x70,0x70},12,0},{0x63,{0x18,0x11,0x71,0xF1,0x70,0x70,0x18,0x13,0x71,0xF3,0x70,0x70},12,0},{0x64,{0x28,0x29,0xF1,0x01,0xF1,0x00,0x07},7,0},{0x66,{0x3C,0x00,0xCD,0x67,0x45,0x45,0x10,0x00,0x00,0x00},10,0},{0x67,{0x00,0x3C,0x00,0x00,0x00,0x01,0x54,0x10,0x32,0x98},10,0},{0x74,{0x10,0x85,0x80,0x00,0x00,0x4E,0x00},7,0},{0x98,{0x3E,0x07},2,0},{GC9A01A_CMD_TELON,{0},0,0}, /* Tearing Effect Line ON */{GC9A01A_CMD_INVON, {0x00},0,0},{GC9A01A_CMD_SLPOUT,{0 },0,120}, /**< SLPOUT (11h): Sleep Out */{GC9A01A_CMD_DISPON,{0}, 0,20}, /**< DISPON (29h): Display On */};/*** \fn gc9a01a_write_cmd* 写命令* \param[in] dev \ref gc9a01a_dev_st* \param[in] cmd 命令字节* \retval 0 成功* \retval 其他值 失败*/static int gc9a01a_write_cmd(gc9a01a_dev_st* dev,uint8_t cmd){uint8_t tmp;if(dev == (gc9a01a_dev_st*)0){return -1;}if(dev->set_dcx == (gc9a01a_set_dcx_pf)0){return -1;}if(dev->write == (gc9a01a_spi_write_pf)0){return -1;}tmp = cmd;dev->enable(1);dev->set_dcx(0);dev->write(&tmp,1);dev->enable(0);return 0;}/*** \fn gc9a01a_write_data* 写数据* \param[in] dev \ref gc9a01a_dev_st* \param[in] data 待写入数据* \param[in] len 待写入数据长度* \retval 0 成功* \retval 其他值 失败*/static int gc9a01a_write_data(gc9a01a_dev_st* dev,uint8_t* data, uint32_t len){if(dev == (gc9a01a_dev_st*)0){return -1;}if(dev->set_dcx == (gc9a01a_set_dcx_pf)0){return -1;}if(dev->write == (gc9a01a_spi_write_pf)0){return -1;}dev->enable(1);dev->set_dcx(1);dev->write(data,len);dev->enable(0);return 0;}/*** \fn gc9a01a_set_windows* 设置窗口范围(行列地址)* \param[in] dev \ref gc9a01a_dev_st* \param[in] data 待写入数据* \param[in] len 待写入数据长度* \retval 0 成功* \retval 其他值 失败*/static int gc9a01a_set_windows(gc9a01a_dev_st* dev, uint16_t x0, uint16_t x1, uint16_t y0, uint16_t y1){uint8_t data[4];gc9a01a_write_cmd(dev, GC9A01A_CMD_CASET);data[0] = (x0>>8) & 0xFF; /* 列开始地址 大端 */data[1] = x0 & 0xFF;data[2] = (x1>>8) & 0xFF; /* 列结束地址 大端 */data[3] = x1 & 0xFF;gc9a01a_write_data(dev, data, 4);gc9a01a_write_cmd(dev, GC9A01A_CMD_RASET);data[0] = (y0>>8) & 0xFF; /* 行开始地址 大端 */data[1] = y0 & 0xFF;data[2] = (y1>>8) & 0xFF; /* 行结束地址 大端 */data[3] = y1 & 0xFF;gc9a01a_write_data(dev, data, 4);return 0;}/*** \fn gc9a01a_sync* 现存写入gc9a01a* \param[in] dev \ref gc9a01a_dev_st* \paran[in] x0 列开始地址* \paran[in] x1 列结束地址* \paran[in] y0 行开始地址* \paran[in] y1 行结束地址* \paran[in] buffer 待写入数据* \paran[in] len 待写入数据长度* \retval 0 成功* \retval 其他值 失败*/int gc9a01a_sync(gc9a01a_dev_st* dev, uint16_t x0, uint16_t x1, uint16_t y0, uint16_t y1, uint16_t* buffer, uint32_t len){(void)dev;gc9a01a_set_windows(dev, x0, x1, y0, y1);gc9a01a_write_cmd(dev,GC9A01A_CMD_RAMWR);gc9a01a_write_data(dev, (uint8_t*)buffer, len);return 0;}/*** \fn gc9a01a_init* 初始化* \param[in] dev \ref gc9a01a_dev_st* \retval 0 成功* \retval 其他值 失败*/int gc9a01a_init(gc9a01a_dev_st* dev){if(dev == (gc9a01a_dev_st*)0){return -1;}if(dev->init_flag != 0){return 0;}dev->init_flag = 1;if(dev->init != 0){dev->init();}dev->set_reset(1);dev->delay(120);dev->set_reset(0);dev->delay(120);dev->set_reset(1);dev->delay(120);/* 初始化序列 */for(uint32_t i=0; i<sizeof(s_gc9a01a_cmd_init_list)/sizeof(s_gc9a01a_cmd_init_list[0]); i++){gc9a01a_write_cmd(dev, s_gc9a01a_cmd_init_list[i].cmd);if(s_gc9a01a_cmd_init_list[i].datalen > 0){gc9a01a_write_data(dev, s_gc9a01a_cmd_init_list[i].data,s_gc9a01a_cmd_init_list[i].datalen);if(s_gc9a01a_cmd_init_list[i].delay > 0){dev->delay(s_gc9a01a_cmd_init_list[i].delay);}}}return 0;}/*** \fn gc9a01a_deinit* 解除初始化* \param[in] dev \ref gc9a01a_dev_st* \return 总是返回0*/int gc9a01a_deinit(gc9a01a_dev_st* dev){if(dev == (gc9a01a_dev_st*)0){return -1;}/* @todo 添加IO等解除初始化配置 */if(dev->deinit != 0){dev->deinit();}return 0;}
gc9a01a.h
extern "C"{typedef void (*gc9a01a_set_dcx_pf)(uint8_t val); /**< DCX引脚操作接口,val=1为数据和参数, val=0为命令 */typedef void (*gc9a01a_set_reset_pf)(uint8_t val); /**< 复位引脚操作,val=1输出高,val=0输出低 */typedef void (*gc9a01a_spi_write_pf)(uint8_t* buffer, uint32_t len); /**< MOSI写接口接口,buffer为待写数据,len为待写长度 */typedef void (*gc9a01a_spi_enable_pf)(uint8_t val); /**< 使能接口 */typedef void (*gc9a01a_spi_delay_ms_pf)(uint32_t t); /**< 延时接口 */typedef void (*gc9a01a_init_pf)(void); /**< 初始化接口 */typedef void (*gc9a01a_deinit_pf)(void); /**< 解除初始化接口 *//*** \struct gc9a01a_dev_st* 设备接口结构体*/typedef struct{gc9a01a_set_dcx_pf set_dcx; /**< DCX写接口 */gc9a01a_set_reset_pf set_reset; /**< RESET写接口 */gc9a01a_spi_write_pf write; /**< 数据写接口 */gc9a01a_spi_enable_pf enable; /**< 使能接口 */gc9a01a_spi_delay_ms_pf delay; /**< 延时接口 */gc9a01a_init_pf init; /**< 初始化接口 */gc9a01a_deinit_pf deinit; /**< 解除初始化接口 */uint16_t* buffer; /**< 显存,用户分配 */int init_flag; /**< 初始化标志 */} gc9a01a_dev_st;/*** \fn gc9a01a_sync* 现存写入gc9a01a* \param[in] dev \ref gc9a01a_dev_st* \paran[in] x0 列开始地址* \paran[in] x1 列结束地址* \paran[in] y0 行开始地址* \paran[in] y1 行结束地址* \paran[in] buffer 待写入数据* \paran[in] len 待写入数据长度* \retval 0 成功* \retval 其他值 失败*/int gc9a01a_sync(gc9a01a_dev_st* dev, uint16_t x0, uint16_t x1, uint16_t y0, uint16_t y1, uint16_t* buffer, uint32_t len);/*** \fn gc9a01a_init* 初始化* \param[in] dev \ref gc9a01a_dev_st* \retval 0 成功* \retval 其他值 失败*/int gc9a01a_init(gc9a01a_dev_st* dev);/*** \fn gc9a01a_deinit* 解除初始化* \param[in] dev \ref gc9a01a_dev_st* \return 总是返回0*/int gc9a01a_deinit(gc9a01a_dev_st* dev);}
三. LVGL驱动注册
LVGL是通过数据结构lv_disp_t来绑定显示器的，
在调用lv_disp_drv_register注册驱动时会返回lv_disp_t*
此时用户就可以使用该返回的lv_disp_t*，作为参数, 在创建obj时指定obj绑定到该lv_disp_t。
所以我们需要将原来的
void lv_port_disp_init(void);
改为
lv_disp_t* lv_port_disp_init(void);
以返回lv_disp_t*给用户使用。
所以在原来一份驱动的基础上
lv_port_disp.c
lv_port_disp.h
改为2份驱动
lv_port_disp1.c
lv_port_disp1.h
lv_port_disp2.c
lv_port_disp2.h
分别提供初始化函数给用户调用
lv_disp_t* lv_port_disp1_init(void);
lv_disp_t* lv_port_disp2_init(void);
因为使用的是同样的屏幕
接口lcd_itf_set_pixel增加一个ID参数即可。
对应的
lv_port_disp1.c
lv_port_disp1.h
内容如下
/*** @file lv_port_disp_templ.c**//*Copy this file as "lv_port_disp.c" and set this value to "1" to enable content*//********************** INCLUDES*********************//********************** DEFINES*********************//*********************** TYPEDEFS**********************//*********************** STATIC PROTOTYPES**********************/static void disp_init(void);static void disp_flush(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p);//static void gpu_fill(lv_disp_drv_t * disp_drv, lv_color_t * dest_buf, lv_coord_t dest_width,// const lv_area_t * fill_area, lv_color_t color);/*********************** STATIC VARIABLES**********************//*********************** MACROS**********************//*********************** GLOBAL FUNCTIONS**********************/lv_disp_t* lv_port_disp1_init(void){/*-------------------------* Initialize your display* -----------------------*/disp_init();/*-----------------------------* Create a buffer for drawing*----------------------------*//*** LVGL requires a buffer where it internally draws the widgets.* Later this buffer will passed to your display driver's `flush_cb` to copy its content to your display.* The buffer has to be greater than 1 display row** There are 3 buffering configurations:* 1. Create ONE buffer:* LVGL will draw the display's content here and writes it to your display** 2. Create TWO buffer:* LVGL will draw the display's content to a buffer and writes it your display.* You should use DMA to write the buffer's content to the display.* It will enable LVGL to draw the next part of the screen to the other buffer while* the data is being sent form the first buffer. It makes rendering and flushing parallel.** 3. Double buffering* Set 2 screens sized buffers and set disp_drv.full_refresh = 1.* This way LVGL will always provide the whole rendered screen in `flush_cb`* and you only need to change the frame buffer's address.*//* Example for 1) */static lv_disp_draw_buf_t draw_buf_dsc_1;static lv_color_t buf_1[MY_DISP_HOR_RES * 10]; /*A buffer for 10 rows*/lv_disp_draw_buf_init(&draw_buf_dsc_1, buf_1, NULL, MY_DISP_HOR_RES * 10); /*Initialize the display buffer*//* Example for 2) *///static lv_disp_draw_buf_t draw_buf_dsc_2;//static lv_color_t buf_2_1[MY_DISP_HOR_RES * 10]; /*A buffer for 10 rows*///static lv_color_t buf_2_2[MY_DISP_HOR_RES * 10]; /*An other buffer for 10 rows*///lv_disp_draw_buf_init(&draw_buf_dsc_2, buf_2_1, buf_2_2, MY_DISP_HOR_RES * 10); /*Initialize the display buffer*//* Example for 3) also set disp_drv.full_refresh = 1 below*///static lv_disp_draw_buf_t draw_buf_dsc_3;//static lv_color_t buf_3_1[MY_DISP_HOR_RES * MY_DISP_VER_RES]; /*A screen sized buffer*///static lv_color_t buf_3_2[MY_DISP_HOR_RES * MY_DISP_VER_RES]; /*Another screen sized buffer*///lv_disp_draw_buf_init(&draw_buf_dsc_3, buf_3_1, buf_3_2,// MY_DISP_VER_RES * LV_VER_RES_MAX); /*Initialize the display buffer*//*-----------------------------------* Register the display in LVGL*----------------------------------*/static lv_disp_drv_t disp_drv; /*Descriptor of a display driver*/lv_disp_drv_init(&disp_drv); /*Basic initialization*//*Set up the functions to access to your display*//*Set the resolution of the display*/disp_drv.hor_res = MY_DISP_HOR_RES;disp_drv.ver_res = MY_DISP_VER_RES;/*Used to copy the buffer's content to the display*/disp_drv.flush_cb = disp_flush;/*Set a display buffer*/disp_drv.draw_buf = &draw_buf_dsc_1;/*Required for Example 3)*///disp_drv.full_refresh = 1;/* Fill a memory array with a color if you have GPU.* Note that, in lv_conf.h you can enable GPUs that has built-in support in LVGL.* But if you have a different GPU you can use with this callback.*///disp_drv.gpu_fill_cb = gpu_fill;/*Finally register the driver*/return lv_disp_drv_register(&disp_drv);}/*********************** STATIC FUNCTIONS**********************//*Initialize your display and the required peripherals.*/static void disp_init(void){lcd_itf_init();/*You code here*/}volatile bool disp1_flush_enabled = true;/* Enable updating the screen (the flushing process) when disp_flush() is called by LVGL*/void disp1_enable_update(void){disp1_flush_enabled = true;}/* Disable updating the screen (the flushing process) when disp_flush() is called by LVGL*/void disp1_disable_update(void){disp1_flush_enabled = false;}/*Flush the content of the internal buffer the specific area on the display*You can use DMA or any hardware acceleration to do this operation in the background but*'lv_disp_flush_ready()' has to be called when finished.*/static void disp_flush(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p){if(disp1_flush_enabled) {/*The most simple case (but also the slowest) to put all pixels to the screen one-by-one*/int32_t x;int32_t y;for(y = area->y1; y <= area->y2; y++) {for(x = area->x1; x <= area->x2; x++) {/*Put a pixel to the display. For example:*//*put_px(x, y, *color_p)*/lcd_itf_set_pixel(0,x, y, *((uint16_t*)color_p));color_p++;}}}/*IMPORTANT!!!*Inform the graphics library that you are ready with the flushing*/lv_disp_flush_ready(disp_drv);}/*OPTIONAL: GPU INTERFACE*//*If your MCU has hardware accelerator (GPU) then you can use it to fill a memory with a color*///static void gpu_fill(lv_disp_drv_t * disp_drv, lv_color_t * dest_buf, lv_coord_t dest_width,// const lv_area_t * fill_area, lv_color_t color)//{// /*It's an example code which should be done by your GPU*/// int32_t x, y;// dest_buf += dest_width * fill_area->y1; /*Go to the first line*///// for(y = fill_area->y1; y <= fill_area->y2; y++) {// for(x = fill_area->x1; x <= fill_area->x2; x++) {// dest_buf[x] = color;// }// dest_buf+=dest_width; /*Go to the next line*/// }//}/*This dummy typedef exists purely to silence -Wpedantic.*/typedef int keep_pedantic_happy;
/*** @file lv_port_disp_templ.h**//*Copy this file as "lv_port_disp.h" and set this value to "1" to enable content*/extern "C" {/********************** INCLUDES*********************//********************** DEFINES*********************//*********************** TYPEDEFS**********************//*********************** GLOBAL PROTOTYPES**********************//* Initialize low level display driver */lv_disp_t* lv_port_disp1_init(void);/* Enable updating the screen (the flushing process) when disp_flush() is called by LVGL*/void disp1_enable_update(void);/* Disable updating the screen (the flushing process) when disp_flush() is called by LVGL*/void disp1_disable_update(void);/*********************** MACROS**********************/} /*extern "C"*/
lv_port_disp2.c
lv_port_disp2.h
内容如下
/*** @file lv_port_disp_templ.c**//*Copy this file as "lv_port_disp.c" and set this value to "1" to enable content*//********************** INCLUDES*********************//********************** DEFINES*********************//*********************** TYPEDEFS**********************//*********************** STATIC PROTOTYPES**********************/static void disp_init(void);static void disp_flush(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p);//static void gpu_fill(lv_disp_drv_t * disp_drv, lv_color_t * dest_buf, lv_coord_t dest_width,// const lv_area_t * fill_area, lv_color_t color);/*********************** STATIC VARIABLES**********************//*********************** MACROS**********************//*********************** GLOBAL FUNCTIONS**********************/lv_disp_t* lv_port_disp2_init(void){/*-------------------------* Initialize your display* -----------------------*/disp_init();/*-----------------------------* Create a buffer for drawing*----------------------------*//*** LVGL requires a buffer where it internally draws the widgets.* Later this buffer will passed to your display driver's `flush_cb` to copy its content to your display.* The buffer has to be greater than 1 display row** There are 3 buffering configurations:* 1. Create ONE buffer:* LVGL will draw the display's content here and writes it to your display** 2. Create TWO buffer:* LVGL will draw the display's content to a buffer and writes it your display.* You should use DMA to write the buffer's content to the display.* It will enable LVGL to draw the next part of the screen to the other buffer while* the data is being sent form the first buffer. It makes rendering and flushing parallel.** 3. Double buffering* Set 2 screens sized buffers and set disp_drv.full_refresh = 1.* This way LVGL will always provide the whole rendered screen in `flush_cb`* and you only need to change the frame buffer's address.*//* Example for 1) */static lv_disp_draw_buf_t draw_buf_dsc_1;static lv_color_t buf_1[MY_DISP_HOR_RES * 10]; /*A buffer for 10 rows*/lv_disp_draw_buf_init(&draw_buf_dsc_1, buf_1, NULL, MY_DISP_HOR_RES * 10); /*Initialize the display buffer*//* Example for 2) *///static lv_disp_draw_buf_t draw_buf_dsc_2;//static lv_color_t buf_2_1[MY_DISP_HOR_RES * 10]; /*A buffer for 10 rows*///static lv_color_t buf_2_2[MY_DISP_HOR_RES * 10]; /*An other buffer for 10 rows*///lv_disp_draw_buf_init(&draw_buf_dsc_2, buf_2_1, buf_2_2, MY_DISP_HOR_RES * 10); /*Initialize the display buffer*//* Example for 3) also set disp_drv.full_refresh = 1 below*///static lv_disp_draw_buf_t draw_buf_dsc_3;//static lv_color_t buf_3_1[MY_DISP_HOR_RES * MY_DISP_VER_RES]; /*A screen sized buffer*///static lv_color_t buf_3_2[MY_DISP_HOR_RES * MY_DISP_VER_RES]; /*Another screen sized buffer*///lv_disp_draw_buf_init(&draw_buf_dsc_3, buf_3_1, buf_3_2,// MY_DISP_VER_RES * LV_VER_RES_MAX); /*Initialize the display buffer*//*-----------------------------------* Register the display in LVGL*----------------------------------*/static lv_disp_drv_t disp_drv; /*Descriptor of a display driver*/lv_disp_drv_init(&disp_drv); /*Basic initialization*//*Set up the functions to access to your display*//*Set the resolution of the display*/disp_drv.hor_res = MY_DISP_HOR_RES;disp_drv.ver_res = MY_DISP_VER_RES;/*Used to copy the buffer's content to the display*/disp_drv.flush_cb = disp_flush;/*Set a display buffer*/disp_drv.draw_buf = &draw_buf_dsc_1;/*Required for Example 3)*///disp_drv.full_refresh = 1;/* Fill a memory array with a color if you have GPU.* Note that, in lv_conf.h you can enable GPUs that has built-in support in LVGL.* But if you have a different GPU you can use with this callback.*///disp_drv.gpu_fill_cb = gpu_fill;/*Finally register the driver*/return lv_disp_drv_register(&disp_drv);}/*********************** STATIC FUNCTIONS**********************//*Initialize your display and the required peripherals.*/static void disp_init(void){lcd_itf_init();/*You code here*/}volatile bool disp2_flush_enabled = true;/* Enable updating the screen (the flushing process) when disp_flush() is called by LVGL*/void disp2_enable_update(void){disp2_flush_enabled = true;}/* Disable updating the screen (the flushing process) when disp_flush() is called by LVGL*/void disp2_disable_update(void){disp2_flush_enabled = false;}/*Flush the content of the internal buffer the specific area on the display*You can use DMA or any hardware acceleration to do this operation in the background but*'lv_disp_flush_ready()' has to be called when finished.*/static void disp_flush(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p){if(disp2_flush_enabled) {/*The most simple case (but also the slowest) to put all pixels to the screen one-by-one*/int32_t x;int32_t y;for(y = area->y1; y <= area->y2; y++) {for(x = area->x1; x <= area->x2; x++) {/*Put a pixel to the display. For example:*//*put_px(x, y, *color_p)*/lcd_itf_set_pixel(1,x, y, *((uint16_t*)color_p));color_p++;}}}/*IMPORTANT!!!*Inform the graphics library that you are ready with the flushing*/lv_disp_flush_ready(disp_drv);}/*OPTIONAL: GPU INTERFACE*//*If your MCU has hardware accelerator (GPU) then you can use it to fill a memory with a color*///static void gpu_fill(lv_disp_drv_t * disp_drv, lv_color_t * dest_buf, lv_coord_t dest_width,// const lv_area_t * fill_area, lv_color_t color)//{// /*It's an example code which should be done by your GPU*/// int32_t x, y;// dest_buf += dest_width * fill_area->y1; /*Go to the first line*///// for(y = fill_area->y1; y <= fill_area->y2; y++) {// for(x = fill_area->x1; x <= fill_area->x2; x++) {// dest_buf[x] = color;// }// dest_buf+=dest_width; /*Go to the next line*/// }//}/*This dummy typedef exists purely to silence -Wpedantic.*/typedef int keep_pedantic_happy;
/*** @file lv_port_disp_templ.h**//*Copy this file as "lv_port_disp.h" and set this value to "1" to enable content*/extern "C" {/********************** INCLUDES*********************//********************** DEFINES*********************//*********************** TYPEDEFS**********************//*********************** GLOBAL PROTOTYPES**********************//* Initialize low level display driver */lv_disp_t* lv_port_disp2_init(void);/* Enable updating the screen (the flushing process) when disp_flush() is called by LVGL*/void disp2_enable_update(void);/* Disable updating the screen (the flushing process) when disp_flush() is called by LVGL*/void disp2_disable_update(void);/*********************** MACROS**********************/} /*extern "C"*/
四.测试
分别在两个屏幕各创建一个按钮显示不同内容
static void btn_event_cb(lv_event_t * e){lv_event_code_t code = lv_event_get_code(e);lv_obj_t * btn = lv_event_get_target(e);if(code == LV_EVENT_CLICKED) {static uint8_t cnt = 0;cnt++;/*Get the first child of the button which is the label and change its text*/lv_obj_t * label = lv_obj_get_child(btn, 0);lv_label_set_text_fmt(label, "Button: %d", cnt);}}/*** Create a button with a label and react on click event.*/static void lv_example_get_started_1(lv_disp_t* disp1, lv_disp_t* disp2){lv_obj_t * btn1 = lv_btn_create(lv_disp_get_scr_act(disp1)); /*Add a button the current screen*/lv_obj_set_pos(btn1, (LCD_ITF_H_SIZE-120)/2, (LCD_ITF_V_SIZE-50)/2); /*Set its position*/lv_obj_set_size(btn1, 120, 50); /*Set its size*/lv_obj_add_event_cb(btn1, btn_event_cb, LV_EVENT_ALL, NULL); /*Assign a callback to the button*/lv_obj_t * label1 = lv_label_create(btn1); /*Add a label to the button*/lv_label_set_text(label1, "This is disp1!"); /*Set the labels text*/lv_obj_center(label1);lv_obj_t * btn2 = lv_btn_create(lv_disp_get_scr_act(disp2)); /*Add a button the current screen*/lv_obj_set_pos(btn2, (LCD_ITF_H_SIZE-120)/2, (LCD_ITF_V_SIZE-50)/2); /*Set its position*/lv_obj_set_size(btn2, 120, 50); /*Set its size*/lv_obj_add_event_cb(btn2, btn_event_cb, LV_EVENT_ALL, NULL); /*Assign a callback to the button*/lv_obj_t * label2 = lv_label_create(btn2); /*Add a label to the button*/lv_label_set_text(label2, "This is disp2!"); /*Set the labels text*/lv_obj_center(label2);}static lv_disp_t* s_disp1;static lv_disp_t* s_disp2;
执行
while(1){lv_log_register_print_cb(my_print);lv_init();s_disp1 = lv_port_disp1_init();if(s_disp1 == (lv_disp_t*)0){printf("disp1 init err\r\n");}s_disp2 = lv_port_disp2_init();if(s_disp2 == (lv_disp_t*)0){printf("disp2 init err\r\n");}lv_example_get_started_1(s_disp1,s_disp2);while(1){uint32_t delay = lv_timer_handler();if (delay < 1) delay = 1;os_delay(delay);}lv_deinit();}
效果如下
五. MusicDemo
Demo中接口增加lv_disp_t参数由用户传入以绑定不同显示器，同时对应的list等全局变量也增加一份，根据不同显示器区分索引。
lv_demo_music.h改为如下
/*** @file lv_demo_music.h**/extern "C" {/********************** INCLUDES*********************//********************** DEFINES*********************//*********************** TYPEDEFS**********************//*********************** GLOBAL PROTOTYPES**********************/void lv_demo_music(lv_disp_t* disp1, lv_disp_t* disp2);void lv_demo_music_close(lv_disp_t* disp1, lv_disp_t* disp2);const char * _lv_demo_music_get_title(uint32_t track_id);const char * _lv_demo_music_get_artist(uint32_t track_id);const char * _lv_demo_music_get_genre(uint32_t track_id);uint32_t _lv_demo_music_get_track_length(uint32_t track_id);/*********************** MACROS**********************/} /* extern "C" */
lv_demo_music.c改为如下
/*** @file lv_demo_music.c**//********************** INCLUDES*********************//********************** DEFINES*********************//*********************** TYPEDEFS**********************//*********************** STATIC PROTOTYPES**********************/static void auto_step_cb(lv_timer_t * timer);/*********************** STATIC VARIABLES**********************/static lv_obj_t * ctrl[2];static lv_obj_t * list[2];static const char * title_list[] = {"Waiting for true love","Need a Better Future","Vibrations","Why now?","Never Look Back","It happened Yesterday","Feeling so High","Go Deeper","Find You There","Until the End","Unknown","Unknown","Unknown","Unknown",};static const char * artist_list[] = {"The John Smith Band","My True Name","Robotics","John Smith","My True Name","Robotics","Robotics","Unknown artist","Unknown artist","Unknown artist","Unknown artist","Unknown artist","Unknown artist","Unknown artist","Unknown artist",};static const char * genre_list[] = {"Rock - 1997","Drum'n bass - 2016","Psy trance - 2020","Metal - 2015","Metal - 2015","Metal - 2015","Metal - 2015","Metal - 2015","Metal - 2015","Metal - 2015","Metal - 2015","Metal - 2015","Metal - 2015","Metal - 2015",};static const uint32_t time_list[] = {1 * 60 + 14,2 * 60 + 26,1 * 60 + 54,2 * 60 + 24,2 * 60 + 37,3 * 60 + 33,1 * 60 + 56,3 * 60 + 31,2 * 60 + 20,2 * 60 + 19,2 * 60 + 20,2 * 60 + 19,2 * 60 + 20,2 * 60 + 19,};static lv_timer_t * auto_step_timer[2];static lv_color_t original_screen_bg_color[2];/*********************** MACROS**********************//*********************** GLOBAL FUNCTIONS**********************/void lv_demo_music(lv_disp_t* disp1, lv_disp_t* disp2){original_screen_bg_color[0] = lv_obj_get_style_bg_color(lv_disp_get_scr_act(disp1), 0);lv_obj_set_style_bg_color(lv_disp_get_scr_act(disp1), lv_color_hex(0x343247), 0);original_screen_bg_color[1] = lv_obj_get_style_bg_color(lv_disp_get_scr_act(disp2), 0);lv_obj_set_style_bg_color(lv_disp_get_scr_act(disp2), lv_color_hex(0x343247), 0);list[0] = _lv_demo_music_list_create(lv_disp_get_scr_act(disp1));list[1] = _lv_demo_music_list_create(lv_disp_get_scr_act(disp2));ctrl[0] = _lv_demo_music_main_create(lv_disp_get_scr_act(disp1));ctrl[1] = _lv_demo_music_main_create(lv_disp_get_scr_act(disp2));auto_step_timer[0] = lv_timer_create(auto_step_cb, 1000, (void*)0);auto_step_timer[1] = lv_timer_create(auto_step_cb, 1000, (void*)1);}void lv_demo_music_close(lv_disp_t* disp1, lv_disp_t* disp2){/*Delete all aniamtions*/lv_anim_del(NULL, NULL);lv_timer_del(auto_step_timer[0]);lv_timer_del(auto_step_timer[1]);_lv_demo_music_list_close();_lv_demo_music_main_close();lv_obj_clean(lv_disp_get_scr_act(disp1));lv_obj_clean(lv_disp_get_scr_act(disp2));lv_obj_set_style_bg_color(lv_disp_get_scr_act(disp1), original_screen_bg_color[0], 0);lv_obj_set_style_bg_color(lv_disp_get_scr_act(disp2), original_screen_bg_color[1], 0);}const char * _lv_demo_music_get_title(uint32_t track_id){if(track_id >= sizeof(title_list) / sizeof(title_list[0])) return NULL;return title_list[track_id];}const char * _lv_demo_music_get_artist(uint32_t track_id){if(track_id >= sizeof(artist_list) / sizeof(artist_list[0])) return NULL;return artist_list[track_id];}const char * _lv_demo_music_get_genre(uint32_t track_id){if(track_id >= sizeof(genre_list) / sizeof(genre_list[0])) return NULL;return genre_list[track_id];}uint32_t _lv_demo_music_get_track_length(uint32_t track_id){if(track_id >= sizeof(time_list) / sizeof(time_list[0])) return 0;return time_list[track_id];}/*********************** STATIC FUNCTIONS**********************/static void auto_step_cb(lv_timer_t * t){void* user_data = t->user_data;int id = (int)user_data;LV_UNUSED(t);static uint32_t state = 0;const lv_font_t * font_small = &lv_font_montserrat_22;const lv_font_t * font_large = &lv_font_montserrat_32;const lv_font_t * font_small = &lv_font_montserrat_12;const lv_font_t * font_large = &lv_font_montserrat_16;switch(state) {case 5:_lv_demo_music_album_next(true);break;case 6:_lv_demo_music_album_next(true);break;case 7:_lv_demo_music_album_next(true);break;case 8:_lv_demo_music_play(0);break;case 11:lv_obj_scroll_by(ctrl[id], 0, -LV_VER_RES, LV_ANIM_ON);break;case 13:lv_obj_scroll_by(ctrl[id], 0, -LV_VER_RES, LV_ANIM_ON);break;case 12:lv_obj_scroll_by(ctrl[id], 0, -LV_VER_RES, LV_ANIM_ON);break;case 15:lv_obj_scroll_by(list[id], 0, -300, LV_ANIM_ON);break;case 16:lv_obj_scroll_by(list[id], 0, 300, LV_ANIM_ON);break;case 18:_lv_demo_music_play(1);break;case 19:lv_obj_scroll_by(ctrl[id], 0, LV_VER_RES, LV_ANIM_ON);break;case 20:lv_obj_scroll_by(ctrl[id], 0, LV_VER_RES, LV_ANIM_ON);break;case 30:_lv_demo_music_play(2);break;case 40: {lv_obj_t * bg = lv_layer_top();lv_obj_set_style_bg_color(bg, lv_color_hex(0x6f8af6), 0);lv_obj_set_style_text_color(bg, lv_color_white(), 0);lv_obj_set_style_bg_opa(bg, LV_OPA_COVER, 0);lv_obj_fade_in(bg, 400, 0);lv_obj_t * dsc = lv_label_create(bg);lv_obj_set_style_text_font(dsc, font_small, 0);lv_label_set_text(dsc, "The average FPS is");lv_obj_align(dsc, LV_ALIGN_TOP_MID, 0, 90);lv_obj_t * num = lv_label_create(bg);lv_obj_set_style_text_font(num, font_large, 0);lv_label_set_text_fmt(num, "%ld", lv_refr_get_fps_avg());lv_obj_align(num, LV_ALIGN_TOP_MID, 0, 120);lv_obj_t * attr = lv_label_create(bg);lv_obj_set_style_text_align(attr, LV_TEXT_ALIGN_CENTER, 0);lv_obj_set_style_text_font(attr, font_small, 0);lv_label_set_text(attr, "Copyright 2020 LVGL Kft.\nwww.lvgl.io | lvgl@lvgl.io");lv_label_set_text(attr, "Copyright 2020 LVGL Kft. | www.lvgl.io | lvgl@lvgl.io");lv_obj_align(attr, LV_ALIGN_BOTTOM_MID, 0, -10);break;}case 41:lv_scr_load(lv_obj_create(NULL));_lv_demo_music_pause();break;}state++;}
执行如下
while(1){lv_log_register_print_cb(my_print);lv_init();s_disp1 = lv_port_disp1_init();if(s_disp1 == (lv_disp_t*)0){printf("disp1 init err\r\n");}s_disp2 = lv_port_disp2_init();if(s_disp2 == (lv_disp_t*)0){printf("disp2 init err\r\n");}lv_demo_music(s_disp1,s_disp2);while(1){uint32_t delay = lv_timer_handler();if (delay < 1) delay = 1;os_delay(delay);}lv_deinit();}
两份实例，所以lcd_conf.h中堆要增大，原来48k改为128k
#define LV_MEM_SIZE (128 * 1024U) /*[bytes]*/
效果见视频，
这里实际并没有修改完整，demo中用到的obj对象实例，都要根据两个显示器准备两份，绑定到不同的显示器，这里只作为演示就不花时间去全部修改了。
六. 总结
LVGL的多显示支持比较简单，只需要注册多个驱动，根据注册返回的lv_disp_t*, 用户即可根据该lv_disp_t* 来操作对象位于哪个显示器。
