1、系统构成，黑色块表示组件非必须
2、环境准备
CubeMX：6.0.1
touchgfx：4.15.0
rt-thread：2020-8-14 commit
Keil：5.30
board：stm32f29igt6 + SDRAM-256Mb（16M x 16）+ SPI-FLASH-16MB + LCD-1024*600
3、打开CubeMX开始创建项目
3.1、安装软件包touchgfx最新版本4.15.0
3.2、系统时钟源RCC配置
3.3、系统调试口及时基SYS配置
3.4、配置SDRAM--W9825G6KH，电气参数及管脚配置
3.5、配置SPI-FLASH--W25Q128JVSQ
3.6、配置图形加速器 ChromART
3.7、显示LTDC接口配置
3.8、触摸芯片I2C接口配置
3.9、组件CRC激活，TouchGFX需要
3.10、加入freertos操作系统，目的是生成touchgfx与操作系统接口文件，方便移植rt-thread，参数配置保持默认即可
3.11、在附加软件管理器中选择TouchGFX用以生成其代码，并做相关配置
3.12、IO口配置，LCD复位、背光，FLASH片选，LED等
3.13、时钟树配置
3.14、生成工程
3.15、直接打开生成的Keil工程编译会报错，这是因为这些文件都是TouchGFX Designer生成，所以需要使用TouchGFX Designer 先生成代码
3.16、打开CubeMX生成的TouchGFX Designer模板工程，加入TEXT、BOX和BUTTON控件后生成touchgfx代码
3.17、再次编译Keil工程
4、补全工程，使之能运行起来
4.1、加入SDRAM配置代码
1 #define REFRESH_COUNT 636//1000//1755//636 2 #define SDRAM_TIMEOUT ((uint32_t)0xFFFF) 3 #define SDRAM_MODEREG_BURST_LENGTH_1 ((uint32_t)0x0000) 4 #define SDRAM_MODEREG_BURST_LENGTH_2 ((uint32_t)0x0001) 5 #define SDRAM_MODEREG_BURST_LENGTH_4 ((uint32_t)0x0002) 6 #define SDRAM_MODEREG_BURST_LENGTH_8 ((uint32_t)0x0004) 7 #define SDRAM_MODEREG_BURST_TYPE_SEQUENTIAL ((uint32_t)0x0000) 8 #define SDRAM_MODEREG_BURST_TYPE_INTERLEAVED ((uint32_t)0x0008) 9 #define SDRAM_MODEREG_CAS_LATENCY_2 ((uint32_t)0x0020) 10 #define SDRAM_MODEREG_CAS_LATENCY_3 ((uint32_t)0x0030) 11 #define SDRAM_MODEREG_OPERATING_MODE_STANDARD ((uint32_t)0x0000) 12 #define SDRAM_MODEREG_WRITEBURST_MODE_PROGRAMMED ((uint32_t)0x0000) 13 #define SDRAM_MODEREG_WRITEBURST_MODE_SINGLE ((uint32_t)0x0200) 14 15 /** 16 * @brief Programs the SDRAM device. 17 * @retval None 18 */ 19 void MX_SDRAM_InitEx(void) 20 { 21 __IO uint32_t tmpmrd = 0; 22 FMC_SDRAM_CommandTypeDef Command; 23 24 /* Step 1: Configure a clock configuration enable command */ 25 Command.CommandMode = FMC_SDRAM_CMD_CLK_ENABLE; 26 Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1; 27 Command.AutoRefreshNumber = 1; 28 Command.ModeRegisterDefinition = 0; 29 30 /* Send the command */ 31 HAL_SDRAM_SendCommand(&hsdram1, &Command, SDRAM_TIMEOUT); 32 33 /* Step 2: Insert 100 us minimum delay */ 34 /* Inserted delay is equal to 1 ms due to systick time base unit (ms) */ 35 HAL_Delay(1); 36 37 /* Step 3: Configure a PALL (precharge all) command */ 38 Command.CommandMode = FMC_SDRAM_CMD_PALL; 39 Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1; 40 Command.AutoRefreshNumber = 1; 41 Command.ModeRegisterDefinition = 0; 42 43 /* Send the command */ 44 HAL_SDRAM_SendCommand(&hsdram1, &Command, SDRAM_TIMEOUT); 45 46 /* Step 4: Configure an Auto Refresh command */ 47 Command.CommandMode = FMC_SDRAM_CMD_AUTOREFRESH_MODE; 48 Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1; 49 Command.AutoRefreshNumber = 8; 50 Command.ModeRegisterDefinition = 0; 51 52 /* Send the command */ 53 HAL_SDRAM_SendCommand(&hsdram1, &Command, SDRAM_TIMEOUT); 54 55 /* Step 5: Program the external memory mode register */ 56 tmpmrd = (uint32_t)SDRAM_MODEREG_BURST_LENGTH_1 | 57 SDRAM_MODEREG_BURST_TYPE_SEQUENTIAL | 58 SDRAM_MODEREG_CAS_LATENCY_3 | 59 SDRAM_MODEREG_OPERATING_MODE_STANDARD | 60 SDRAM_MODEREG_WRITEBURST_MODE_SINGLE; 61 62 Command.CommandMode = FMC_SDRAM_CMD_LOAD_MODE; 63 Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1; 64 Command.AutoRefreshNumber = 1; 65 Command.ModeRegisterDefinition = tmpmrd; 66 67 /* Send the command */ 68 HAL_SDRAM_SendCommand(&hsdram1, &Command, SDRAM_TIMEOUT); 69 70 /* Step 6: Set the refresh rate counter */ 71 /* Set the device refresh rate */ 72 HAL_SDRAM_ProgramRefreshRate(&hsdram1, REFRESH_COUNT); 73 }
4.2、加入SPI-FLASH驱动
4.3、加入触摸驱动
5、FAQ
5.1、LTDC刷新频率过高导致的屏幕闪烁错位情况，相同硬件第一次设置25M工作正常，第二次25M就出现下面现象，修改为23M后工作正常，感觉会变很奇怪
5.2 、framebuffer过小导致的显示断屏错位，大小应该是分辨率×色深 (800×480×3) Byte
5.3、FT5436触摸IC获取第一点触摸Y坐标概率性负值，即MSB是1，须转为正值 ，可 & 0x7FFF，否则造成触摸间歇性失效，如 drag 效果达不到
