#include /* Minimal helper library for the 320x240 TFT LCD, with ILI9341 controller chip Required configuration, example: #define DISPLAY_SPI spi0 #define PIN_TFT_BACKLIGHT 1 #define PIN_TFT_SCK 2 #define PIN_TFT_MOSI 3 #define PIN_TFT_CS 5 // optional #define PIN_TFT_DC 6 #define PIN_TFT_RESET 7 */ #define u8 uint8_t #define u16 uint16_t #define u32 uint32_t #define DC_C sio_hw->gpio_clr = (1ul << PIN_TFT_DC) #define DC_D sio_hw->gpio_set = (1ul << PIN_TFT_DC) #define WAIT_FOR_BUSY while (spi_get_hw(DISPLAY_SPI)->sr & SPI_SSPSR_BSY_BITS){}; #define tft_Write_8N(B) while (!spi_is_writable(DISPLAY_SPI)){}; spi_get_hw(DISPLAY_SPI)->dr = (uint8_t)(B) #define COLOR_BLACK 0x0000 // 0, 0, 0 #define COLOR_NAVY 0x000F // 0, 0, 123 #define COLOR_DARKGREEN 0x03E0 // 0, 125, 0 #define COLOR_DARKCYAN 0x03EF // 0, 125, 123 #define COLOR_MAROON 0x7800 // 123, 0, 0 #define COLOR_PURPLE 0x780F // 123, 0, 123 #define COLOR_OLIVE 0x7BE0 // 123, 125, 0 #define COLOR_LIGHTGREY 0xC618 // 198, 195, 198 #define COLOR_DARKGREY 0x7BEF // 123, 125, 123 #define COLOR_BLUE 0x001F // 0, 0, 255 #define COLOR_GREEN 0x07E0 // 0, 255, 0 #define COLOR_CYAN 0x07FF // 0, 255, 255 #define COLOR_RED 0xF800 // 255, 0, 0 #define COLOR_MAGENTA 0xF81F // 255, 0, 255 #define COLOR_YELLOW 0xFFE0 // 255, 255, 0 #define COLOR_WHITE 0xFFFF // 255, 255, 255 #define COLOR_ORANGE 0xFD20 // 255, 165, 0 #define COLOR_GREENYELLOW 0xAFE5 // 173, 255, 41 #define COLOR_PINK 0xFC18 // 255, 130, 198 // #define ILI9341_TFTWIDTH 240 // ILI9341 max TFT width // #define ILI9341_TFTHEIGHT 320 // ILI9341 max TFT height // with swapped vertical/horizontal memory access, making it landscape mode #define ILI9341_TFTWIDTH 320 #define ILI9341_TFTHEIGHT 240 #define ILI9341_NOP 0x00 // No-op register #define ILI9341_SWRESET 0x01 // Software reset register #define ILI9341_RDDID 0x04 // Read display identification information #define ILI9341_RDDST 0x09 // Read Display Status #define ILI9341_SLPIN 0x10 // Enter Sleep Mode #define ILI9341_SLPOUT 0x11 // Sleep Out #define ILI9341_PTLON 0x12 // Partial Mode ON #define ILI9341_NORON 0x13 // Normal Display Mode ON #define ILI9341_RDMODE 0x0A // Read Display Power Mode #define ILI9341_RDMADCTL 0x0B // Read Display MADCTL #define ILI9341_RDPIXFMT 0x0C // Read Display Pixel Format #define ILI9341_RDIMGFMT 0x0D // Read Display Image Format #define ILI9341_RDSELFDIAG 0x0F // Read Display Self-Diagnostic Result #define ILI9341_INVOFF 0x20 // Display Inversion OFF #define ILI9341_INVON 0x21 // Display Inversion ON #define ILI9341_GAMMASET 0x26 // Gamma Set #define ILI9341_DISPOFF 0x28 // Display OFF #define ILI9341_DISPON 0x29 // Display ON #define ILI9341_CASET 0x2A // Column Address Set #define ILI9341_PASET 0x2B // Page Address Set #define ILI9341_RAMWR 0x2C // Memory Write #define ILI9341_RAMRD 0x2E // Memory Read #define ILI9341_PTLAR 0x30 // Partial Area #define ILI9341_VSCRDEF 0x33 // Vertical Scrolling Definition #define ILI9341_MADCTL 0x36 // Memory Access Control #define ILI9341_VSCRSADD 0x37 // Vertical Scrolling Start Address #define ILI9341_PIXFMT 0x3A // COLMOD: Pixel Format Set #define ILI9341_FRMCTR1 0xB1 // Frame Rate Control (In Normal Mode/Full Colors) #define ILI9341_FRMCTR2 0xB2 // Frame Rate Control (In Idle Mode/8 colors) #define ILI9341_FRMCTR3 0xB3 // Frame Rate control (In Partial Mode/Full Colors) #define ILI9341_INVCTR 0xB4 // Display Inversion Control #define ILI9341_DFUNCTR 0xB6 // Display Function Control #define ILI9341_PWCTR1 0xC0 // Power Control 1 #define ILI9341_PWCTR2 0xC1 // Power Control 2 #define ILI9341_PWCTR3 0xC2 // Power Control 3 #define ILI9341_PWCTR4 0xC3 // Power Control 4 #define ILI9341_PWCTR5 0xC4 // Power Control 5 #define ILI9341_VMCTR1 0xC5 // VCOM Control 1 #define ILI9341_VMCTR2 0xC7 // VCOM Control 2 #define ILI9341_RDID1 0xDA // Read ID 1 #define ILI9341_RDID2 0xDB // Read ID 2 #define ILI9341_RDID3 0xDC // Read ID 3 #define ILI9341_RDID4 0xDD // Read ID 4 #define ILI9341_GMCTRP1 0xE0 // Positive Gamma Correction #define ILI9341_GMCTRN1 0xE1 // Negative Gamma Correction static const uint8_t initcmd[] = { 0xEF, 3, 0x03, 0x80, 0x02, // undocumented mystery command 0xCF, 3, 0x00, 0xC1, 0x30, // power control B 0xED, 4, 0x64, 0x03, 0x12, 0x81, // power on sequence control 0xE8, 3, 0x85, 0x00, 0x78, // driver timing control A 0xCB, 5, 0x39, 0x2C, 0x00, 0x34, 0x02, // power control A 0xF7, 1, 0x20, // pump ratio control 0xEA, 2, 0x00, 0x00, // driver timing control B ILI9341_PWCTR1 , 1, 0x23, // Power control VRH[5:0] ILI9341_PWCTR2 , 1, 0x10, // Power control SAP[2:0];BT[3:0] ILI9341_VMCTR1 , 2, 0x3e, 0x28, // VCOM control 1 ILI9341_VMCTR2 , 1, 0x86, // VCOM control 2 ILI9341_MADCTL , 1, 0x48, // Memory Access Control, sets access order // ILI9341_VSCRSADD, 1, 0x00, // Vertical scroll zero ILI9341_PIXFMT , 1, 0x55, // pixel format, 16bpp (RGB565) // 0xF6, 3, 0x01, 0x00, 0x02, // enable RGB mode ILI9341_FRMCTR1 , 2, 0x00, 0x13, // frame rate control, division ratio 2^0, 79hz(why??) ILI9341_DFUNCTR , 3, 0x08, 0x82, 0x27, // Display Function Control, 0xF2, 1, 0x00, // 3Gamma Function Disable ILI9341_GAMMASET , 1, 0x01, // Gamma curve selected ILI9341_GMCTRP1 , 15, 0x0F, 0x31, 0x2B, 0x0C, 0x0E, 0x08, // Set Gamma 0x4E, 0xF1, 0x37, 0x07, 0x10, 0x03, 0x0E, 0x09, 0x00, ILI9341_GMCTRN1 , 15, 0x00, 0x0E, 0x14, 0x03, 0x11, 0x07, // Set Gamma 0x31, 0xC1, 0x48, 0x08, 0x0F, 0x0C, 0x31, 0x36, 0x0F, ILI9341_SLPOUT , 0x80, // Exit Sleep ILI9341_DISPON , 0, // Display on 0x00 // End of list }; void tft_send_command(u8 cmd, const u8 *args, size_t arg_count) { #ifdef PIN_TFT_CS gpio_put(PIN_TFT_CS, 0); #endif DC_C; spi_write_blocking(DISPLAY_SPI, &cmd, 1); if (arg_count) { DC_D; spi_write_blocking(DISPLAY_SPI, args, arg_count); } #ifdef PIN_TFT_CS gpio_put(PIN_TFT_CS, 1); #endif } void tft_init_pins() { gpio_init(PIN_TFT_BACKLIGHT); gpio_set_dir(PIN_TFT_BACKLIGHT, GPIO_OUT); gpio_set_dir(PIN_TFT_SCK, GPIO_OUT); gpio_set_function(PIN_TFT_SCK, GPIO_FUNC_SPI); gpio_set_dir(PIN_TFT_MOSI, GPIO_OUT); gpio_set_function(PIN_TFT_MOSI, GPIO_FUNC_SPI); gpio_set_function(PIN_TFT_DC, GPIO_FUNC_SIO); gpio_set_dir(PIN_TFT_DC, GPIO_OUT); gpio_put(PIN_TFT_DC, 1); #ifdef PIN_TFT_CS gpio_init(PIN_TFT_CS); gpio_set_dir(PIN_TFT_CS, GPIO_OUT); #endif gpio_set_function(PIN_TFT_RESET, GPIO_FUNC_SIO); gpio_set_dir(PIN_TFT_RESET, GPIO_OUT); gpio_put(PIN_TFT_RESET, 1); } void tft_init_display(uint baudrate) { tft_init_pins(); spi_init(DISPLAY_SPI, baudrate); // reset display gpio_put(PIN_TFT_RESET, 1); sleep_ms(5); gpio_put(PIN_TFT_RESET, 0); sleep_ms(20); gpio_put(PIN_TFT_RESET, 1); sleep_ms(150); // init display const u8 *addr = initcmd; while (1) { u8 cmd = *(addr++); if (cmd == 0) break; u8 x = *(addr++); u8 arg_count = x & 0x7f; tft_send_command(cmd, addr, arg_count); addr += arg_count; if (x & 0x80) sleep_ms(120); } sleep_ms(150); gpio_put(PIN_TFT_BACKLIGHT, 1); } void tft_set_pixel(int x, int y, u32 color) { tft_send_command(ILI9341_CASET, (u8[]){x >> 8, x, x >> 8, x}, 4); tft_send_command(ILI9341_PASET, (u8[]){y >> 8, y, y >> 8, y}, 4); DC_C; spi_get_hw(DISPLAY_SPI)->dr = ILI9341_RAMWR; WAIT_FOR_BUSY; DC_D; tft_Write_8N((u8)(color >> 8)); tft_Write_8N((u8)(color & 0xff)); WAIT_FOR_BUSY; } void tft_fill(u16 color) { tft_send_command(ILI9341_CASET, (u8[]){0, 0, ILI9341_TFTWIDTH >> 8, (u8)ILI9341_TFTWIDTH}, 4); tft_send_command(ILI9341_PASET, (u8[]){0, 0, ILI9341_TFTHEIGHT >> 8, (u8)ILI9341_TFTHEIGHT}, 4); DC_C; spi_get_hw(DISPLAY_SPI)->dr = ILI9341_RAMWR; WAIT_FOR_BUSY; DC_D; u8 upper = color >> 8; u8 lower = color; u32 pixel_count = ILI9341_TFTWIDTH * ILI9341_TFTHEIGHT; while (pixel_count--) { tft_Write_8N(upper); tft_Write_8N(lower); } WAIT_FOR_BUSY; }