AT32移植LVGL_V8具体步骤
本帖最后由 tpgf 于 2022-7-6 12:03 编辑前言:大部分单片机移植lvgl的步骤都可以参考以下内容,内容从spi驱动,再到液晶驱动,再到lvgl移植,从一个基础工程到移植完成一、下载LVGL_V8源码暂时不需要吧如果使用AT-START-F403开发板时,不需要进行SRAM的扩展,因为403的SRAM默认就为96K。如果使用AT-START-F413开发板时,强烈建议进行SRAM的扩展,因为413的SRAM默认只有32K,很容易就会超出范围。源码地址:LVGL源码https://github.com/lvgl/lvgl提取出以下文件1.examples/porting2.src3.lvgl.h lv_conf.h二、SPI驱动目前只做了spi屏的移植,并口屏后面有机会再补充1.spi初始化目前使用AT32提供的固件库,刚开始可以不使用SPI DMA,可以验证spi的配置是否正确,再同过DMA提升刷屏速度#if (SPI_USE_DMA == 0)/*** @briefspi configuration.* @paramnone* @retval none*/void SPI3_Init(void){ spi_init_type spi_init_struct; //gpio_config(); spi_i2s_reset(SPI3); crm_periph_clock_enable(CRM_SPI3_PERIPH_CLOCK, TRUE); spi_default_para_init(&spi_init_struct); spi_init_struct.transmission_mode = SPI_TRANSMIT_HALF_DUPLEX_TX; spi_init_struct.master_slave_mode = SPI_MODE_MASTER; spi_init_struct.mclk_freq_division = SPI_MCLK_DIV_8; spi_init_struct.first_bit_transmission = SPI_FIRST_BIT_MSB; spi_init_struct.frame_bit_num = SPI_FRAME_8BIT; spi_init_struct.clock_polarity = SPI_CLOCK_POLARITY_LOW; spi_init_struct.clock_phase = SPI_CLOCK_PHASE_1EDGE; spi_init_struct.cs_mode_selection = SPI_CS_SOFTWARE_MODE; if(spi_init_struct.cs_mode_selection == SPI_CS_HARDWARE_MODE) { spi_init_struct.cs_mode_selection = SPI_CS_SOFTWARE_MODE; } spi_init(SPI3, &spi_init_struct); spi_enable(SPI3, TRUE);}#elseuint8_t spi3_tx_buffer;void SPI3_Init(void){ dma_init_type dma_init_struct; spi_init_type spi_init_struct; /* SPI_MASTER_Tx_DMA_Channel configuration ---------------------------------------------*/ /**************DMA 配置 *****************/ crm_periph_clock_enable(CRM_DMA2_PERIPH_CLOCK, TRUE); dma_reset(SPI_MASTER_Tx_DMA_Channel); dma_default_para_init(&dma_init_struct); dma_init_struct.buffer_size = BUFFER_SIZE; dma_init_struct.direction = DMA_DIR_MEMORY_TO_PERIPHERAL; dma_init_struct.memory_base_addr = (uint32_t)spi3_tx_buffer; dma_init_struct.memory_data_width = DMA_MEMORY_DATA_WIDTH_BYTE; dma_init_struct.memory_inc_enable = TRUE; dma_init_struct.peripheral_base_addr = (uint32_t)&SPI3->dt; dma_init_struct.peripheral_data_width = DMA_PERIPHERAL_DATA_WIDTH_BYTE; dma_init_struct.peripheral_inc_enable = FALSE; dma_init_struct.priority = DMA_PRIORITY_MEDIUM; dma_init_struct.loop_mode_enable = FALSE;//是否循环模式 dma_init(DMA2_CHANNEL2, &dma_init_struct); /**************SPI 配置 *****************/ crm_periph_clock_enable(CRM_SPI3_PERIPH_CLOCK, TRUE); spi_default_para_init(&spi_init_struct); spi_init_struct.transmission_mode = SPI_TRANSMIT_HALF_DUPLEX_TX; spi_init_struct.master_slave_mode = SPI_MODE_MASTER; spi_init_struct.mclk_freq_division = SPI_MCLK_DIV_8; spi_init_struct.first_bit_transmission = SPI_FIRST_BIT_MSB; spi_init_struct.frame_bit_num = SPI_FRAME_8BIT; spi_init_struct.clock_polarity = SPI_CLOCK_POLARITY_HIGH; spi_init_struct.clock_phase = SPI_CLOCK_PHASE_2EDGE; spi_init_struct.cs_mode_selection = SPI_CS_SOFTWARE_MODE; spi_init(SPI3, &spi_init_struct); spi_i2s_dma_transmitter_enable(SPI3, TRUE); //中断配置 /* enable transfer full data intterrupt */ dma_interrupt_enable(SPI_MASTER_Tx_DMA_Channel, DMA_FDT_INT, TRUE); /* dma1 channel1 interrupt nvic init */ nvic_irq_enable(DMA2_Channel2_IRQn, 1, 0); /* config flexible dma for usart2 tx */ dma_flexible_config(DMA2, FLEX_CHANNEL2, DMA_FLEXIBLE_SPI3_TX); spi_enable(SPI3, TRUE);}void DMA2_Channel2_IRQHandler(void){ /*DMA发送完成中断*/ if(dma_flag_get(DMA2_FDT2_FLAG)) { LCD_CS_SET; dma_flag_clear(DMA2_FDT2_FLAG); lv_disp_flush_complete();/* tell lvgl that flushing is done */ dma_channel_enable(DMA2_CHANNEL2, FALSE); }}void disp_spi_dma_send(const void* buf, uint32_t size){ LCD_RS_SET; LCD_CS_CLR; while(spi_i2s_flag_get(SPI3,SPI_I2S_BF_FLAG) == SET){}; dma_channel_enable(DMA2_CHANNEL2, FALSE); /* usart2 tx begin dma transmitting */ DMA2_CHANNEL2->maddr = (uint32_t)buf; DMA2_CHANNEL2->dtcnt = size; dma_channel_enable(DMA2_CHANNEL2, TRUE); /*** 不开DMA完成中断的执行 ***/// while(spi_i2s_flag_get(SPI3,SPI_I2S_BF_FLAG) == SET){};// while(dma_flag_get(DMA2_FDT2_FLAG) == RESET){};// dma_flag_clear(DMA2_FDT2_FLAG);// lv_disp_flush_complete();}
三、lcd驱动1.spi lcd 驱动移植基本上将以下一个函数实现即可
吐槽一下,液晶技术支持一般就提供一个模拟spi的驱动
虽然通用性强,但是太慢了
static void LCD_WR_BYTE(u8 cmd,u8 regval)
{
int i;
if(cmd)
{
LCD_RS_CLR;
}
else
{
LCD_RS_SET;
}
LCD_CS_CLR;
#if USE_SPI
LCD_WRITE_BYTE(regval);
#else
for(i=0;i<8;i++)
{
if(regval &0x80)
{
LCD_SDA_SET;
}
else LCD_SDA_CLR;
LCD_SCL_CLR;
LCD_SCL_SET;
regval <<=1;
}
#endif
LCD_CS_SET;
}
void LCD_WRITE_BYTE(uint8_t DATA)
{
spi_i2s_data_transmit(LCD_SPI, DATA);
while(spi_i2s_flag_get(LCD_SPI, SPI_I2S_BF_FLAG) == SET ){};
}
2.lcd初始化中需要注意的点1.一般需要更改的就是下面更改刷屏方向,以及RGB排列 LCD_WR_DATA(0x00|MADCTL_MV|MADCTL_RGB);
2. 16位颜色数据高低字节顺序从发送颜色数据的函数可以看出,先发的是16位颜色数据低字节,再发高字节
而 使用SPI DMA发送时是按照at32 stm32等都是小端模式,即 16位数据 或者32位数据等,是低字节存放在高地址中使用8位spi传输时,16位像素的低字节被先写入,而高字节被后写入,这就导致了屏幕反色的问题,解决这个问题,有三种方案,1 .将SPI写入改为16位模式,这样能够使高字节先写入2 .写入前先进行字节反转3 .在LVGL上层进行颜色翻转,lv_conf.h中配置了#define LV_COLOR_16_SWAP 1这是最简单的方法,后面也会提到。有时候忽略这个就会出现花屏//发送颜色数据 void Lcd_Write_Data(u16 dat16){LCD_WR_DATA(dat16>>8);LCD_WR_DATA(dat16); } 三、LVGL配置lv_conf.h中需要注意的几个配置/*Color depth: 1 (1 byte per pixel), 8 (RGB332), 16 (RGB565), 32 (ARGB8888)*/#define LV_COLOR_DEPTH 16/*Swap the 2 bytes of RGB565 color. Useful if the display has an 8-bit interface (e.g. SPI)*/#define LV_COLOR_16_SWAP 1#define LV_MEM_SIZE (24U * 1024U) /**/#define LV_SPRINTF_CUSTOM 1
1 .LV_COLOR_16_SWAP 1 16位颜色数据高低字节反转 使用spi屏的时候一般都要用
2. LV_MEM_SIZE 一些单片机的SRAM可能只有64k,甚至32k的大小,lvgl直接占48K肯定不合适
3. LVGL lv_label_set_text_fmt 显示只有f
解决方式https://blog.csdn.net/weixin_44684950/article/details/124426341
本帖最后由 tpgf 于 2022-7-6 12:05 编辑
四、LVGL与lcd屏幕接口实现屏幕接口函数都在lv_port_disp.c中1 lv_port_disp_initlv_port_disp_init删掉注释,主要内容为void lv_port_disp_init(void){ disp_init(); /** * 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. *//********************更改 by WS ************************************************/ //三种选一种不开DMA 用第一种 // 开DMA双缓冲用第二种 #if (SPI_USE_DMA != 1) /* Example for 1) */ static lv_disp_draw_buf_t draw_buf_dsc_1; static lv_color_t buf_1; /*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*/#else /* Example for 2) */ static lv_disp_draw_buf_t draw_buf_dsc_2; static lv_color_t buf_2_1; /*A buffer for 10 rows*/ static lv_color_t buf_2_2; /*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*/#endif// /* 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; /*A screen sized buffer*/// static lv_color_t buf_3_2; /*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*//********************更改 by WS END ************************************************/ 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;/********************更改 by WS ************************************************/ //三种选一种不开DMA 用第一种 // 开DMA双缓冲用第二种 /*Set a display buffer*/#if (SPI_USE_DMA != 1) disp_drv.draw_buf = &draw_buf_dsc_1;#else disp_drv.draw_buf = &draw_buf_dsc_2;#endif /*Required for Example 3)*/ //disp_drv.full_refresh = 1 //disp_drv.gpu_fill_cb = gpu_fill; lv_disp_drv_register(&disp_drv);}//封装一下方便外部调用void lv_disp_flush_complete(void){ lv_disp_flush_ready(disp_drv_p);}
方式1一个数组做缓冲区,节省空间,速度偏慢。
方式2两个数组做缓冲区,空间需要大,速度快点。
方式3也是双缓冲区,但是是每次都刷新整个屏幕。
三种必须选一种,不然内存不够
disp_flush 刷屏函数
static void disp_flush(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p)
{
/*The most simple case (but also the slowest) to put all pixels to the screen one-by-one*/
int32_t x;
int32_t y;
int16_t w = (area->x2 - area->x1 + 1);
int16_t h = (area->y2 - area->y1 + 1);
uint32_t size = w * h * 2;
disp_drv_p = disp_drv;
#if SPI_USE_DMA
//设置刷新区域
Address_set(area->x1, area->y1, area->x2, area->y2);
// LCD_RS_SET;
// LCD_CS_CLR;
disp_spi_dma_send(color_p, size);
#else
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_DrawPoint(x,y,color_p->full);
color_p++;
}
}
/*IMPORTANT!!!
*Inform the graphics library that you are ready with the flushing*/
lv_disp_flush_ready(disp_drv);
#endif
}
同样通过宏定义区分是否使用DMA
使用spi直接发送要注意 color_p->full为颜色值
LCD_DrawPoint(x,y,color_p->full);
五、设置心跳需要调用两个函数lv_tick_inc(1); // 这个函数设置心跳,参数1代表1ms。通常将他放在1毫秒中断一次的定时器中断处理中lv_task_handler(); // 这个函数用来处理LVGL的工作,每心跳一次,这里面就执行一次。lv_tick_inc(1);
测试时可以直接放到主函数循环中,后面可以放到滴答定时器或者普通定时器中调用
六、优化显示速度(重要)
1.采用dma方式填充 双缓冲
1.中断调用 lv_disp_flush_ready( disp_drv_p); 不死等DMA发送完成
2.更改缓冲大小,尽量大
3.LVGL帧率限制
首先,LVGL是有一个帧率刷新周期的宏定义,LVGL会通过LVGL内部的tick,定时去刷屏幕,也就是说该宏定义限定了LVGL刷屏帧率的上限,默认满帧33帧。
#define LV_DISP_DEF_REFR_PERIOD 30 //这里我们直接设10ms刷新一次,满帧100帧。4.LV_USE_PERF_MONITOR 随时监控帧率2. 修改at32堆栈大小3. 扩展SRAM???4.C++中使用LVGL使用keil在cpp文件中包含lvgl.h时报错 expected an expression
查看相关代码,已经做过cpp相关兼容了#if _LV_COLOR_HAS_MODERN_CPP/*Fix msvc compiler error C4576 inside C++ code*/#define _LV_COLOR_MAKE_TYPE_HELPER lv_color_t#else#define _LV_COLOR_MAKE_TYPE_HELPER (lv_color_t)#endif
解决方法
参考http://whycan.run/t_830.html
分享解决littlevgl移植到keil 5.24版本出现的编译错误的办法
littlevgl 大量用到 gnu扩展和 C99语法,
如果编译器不支持就要对代码大动干戈,
还好 MDK 5.24a 已经对C99和GNU支持很好了,
只需要轻轻设置一下 C/C++ 编译参数即可.
否则,你将会遇到以下恼人的编译错误:
增加编译flag --gnu
最近刚好有贴友在找LVGL V8的移植方法,太及时了。 如何实现多个圆操作? LVGL_V8不好用 v7和v8的api都不一样了。 如何缩减LVGL的内存呢?
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