#include "stm32f4xx_hal.h" #include "st7735.h" #include "malloc.h" #include "string.h" #define DELAY 0x80 // based on Adafruit ST7735 library for Arduino static const uint8_t init_cmds1[] = { // Init for 7735R, part 1 (red or green tab) 15, // 15 commands in list: ST7735_SWRESET, DELAY, // 1: Software reset, 0 args, w/delay 150, // 150 ms delay ST7735_SLPOUT , DELAY, // 2: Out of sleep mode, 0 args, w/delay 255, // 500 ms delay ST7735_FRMCTR1, 3 , // 3: Frame rate ctrl - normal mode, 3 args: 0x01, 0x2C, 0x2D, // Rate = fosc/(1x2+40) * (LINE+2C+2D) ST7735_FRMCTR2, 3 , // 4: Frame rate control - idle mode, 3 args: 0x01, 0x2C, 0x2D, // Rate = fosc/(1x2+40) * (LINE+2C+2D) ST7735_FRMCTR3, 6 , // 5: Frame rate ctrl - partial mode, 6 args: 0x01, 0x2C, 0x2D, // Dot inversion mode 0x01, 0x2C, 0x2D, // Line inversion mode ST7735_INVCTR , 1 , // 6: Display inversion ctrl, 1 arg, no delay: 0x07, // No inversion ST7735_PWCTR1 , 3 , // 7: Power control, 3 args, no delay: 0xA2, 0x02, // -4.6V 0x84, // AUTO mode ST7735_PWCTR2 , 1 , // 8: Power control, 1 arg, no delay: 0xC5, // VGH25 = 2.4C VGSEL = -10 VGH = 3 * AVDD ST7735_PWCTR3 , 2 , // 9: Power control, 2 args, no delay: 0x0A, // Opamp current small 0x00, // Boost frequency ST7735_PWCTR4 , 2 , // 10: Power control, 2 args, no delay: 0x8A, // BCLK/2, Opamp current small & Medium low 0x2A, ST7735_PWCTR5 , 2 , // 11: Power control, 2 args, no delay: 0x8A, 0xEE, ST7735_VMCTR1 , 1 , // 12: Power control, 1 arg, no delay: 0x0E, ST7735_INVOFF , 0 , // 13: Don't invert display, no args, no delay ST7735_MADCTL , 1 , // 14: Memory access control (directions), 1 arg: ST7735_ROTATION, // row addr/col addr, bottom to top refresh ST7735_COLMOD , 1 , // 15: set color mode, 1 arg, no delay: 0x05 }, // 16-bit color #if (defined(ST7735_IS_128X128) || defined(ST7735_IS_160X128)) init_cmds2[] = { // Init for 7735R, part 2 (1.44" display) 2, // 2 commands in list: ST7735_CASET , 4 , // 1: Column addr set, 4 args, no delay: 0x00, 0x00, // XSTART = 0 0x00, 0x7F, // XEND = 127 ST7735_RASET , 4 , // 2: Row addr set, 4 args, no delay: 0x00, 0x00, // XSTART = 0 0x00, 0x7F }, // XEND = 127 #endif // ST7735_IS_128X128 #ifdef ST7735_IS_160X80 init_cmds2[] = { // Init for 7735S, part 2 (160x80 display) 3, // 3 commands in list: ST7735_CASET , 4 , // 1: Column addr set, 4 args, no delay: 0x00, 0x00, // XSTART = 0 0x00, 0x4F, // XEND = 79 ST7735_RASET , 4 , // 2: Row addr set, 4 args, no delay: 0x00, 0x00, // XSTART = 0 0x00, 0x9F , // XEND = 159 ST7735_INVON, 0 }, // 3: Invert colors #endif init_cmds3[] = { // Init for 7735R, part 3 (red or green tab) 4, // 4 commands in list: ST7735_GMCTRP1, 16 , // 1: Gamma Adjustments (pos. polarity), 16 args, no delay: 0x02, 0x1c, 0x07, 0x12, 0x37, 0x32, 0x29, 0x2d, 0x29, 0x25, 0x2B, 0x39, 0x00, 0x01, 0x03, 0x10, ST7735_GMCTRN1, 16 , // 2: Gamma Adjustments (neg. polarity), 16 args, no delay: 0x03, 0x1d, 0x07, 0x06, 0x2E, 0x2C, 0x29, 0x2D, 0x2E, 0x2E, 0x37, 0x3F, 0x00, 0x00, 0x02, 0x10, ST7735_NORON , DELAY, // 3: Normal display on, no args, w/delay 10, // 10 ms delay ST7735_DISPON , DELAY, // 4: Main screen turn on, no args w/delay 100 }; // 100 ms delay static void ST7735_Select() { HAL_GPIO_WritePin(ST7735_CS_GPIO_Port, ST7735_CS_Pin, GPIO_PIN_RESET); } void ST7735_Unselect() { HAL_GPIO_WritePin(ST7735_CS_GPIO_Port, ST7735_CS_Pin, GPIO_PIN_SET); } static void ST7735_Reset() { HAL_GPIO_WritePin(ST7735_RES_GPIO_Port, ST7735_RES_Pin, GPIO_PIN_RESET); HAL_Delay(5); HAL_GPIO_WritePin(ST7735_RES_GPIO_Port, ST7735_RES_Pin, GPIO_PIN_SET); } static void ST7735_WriteCommand(uint8_t cmd) { HAL_GPIO_WritePin(ST7735_DC_GPIO_Port, ST7735_DC_Pin, GPIO_PIN_RESET); HAL_SPI_Transmit(&ST7735_SPI_PORT, &cmd, sizeof(cmd), HAL_MAX_DELAY); } static void ST7735_WriteData(uint8_t* buff, size_t buff_size) { HAL_GPIO_WritePin(ST7735_DC_GPIO_Port, ST7735_DC_Pin, GPIO_PIN_SET); HAL_SPI_Transmit(&ST7735_SPI_PORT, buff, buff_size, HAL_MAX_DELAY); } static void ST7735_ExecuteCommandList(const uint8_t *addr) { uint8_t numCommands, numArgs; uint16_t ms; numCommands = *addr++; while(numCommands--) { uint8_t cmd = *addr++; ST7735_WriteCommand(cmd); numArgs = *addr++; // If high bit set, delay follows args ms = numArgs & DELAY; numArgs &= ~DELAY; if(numArgs) { ST7735_WriteData((uint8_t*)addr, numArgs); addr += numArgs; } if(ms) { ms = *addr++; if(ms == 255) ms = 500; HAL_Delay(ms); } } } static void ST7735_SetAddressWindow(uint8_t x0, uint8_t y0, uint8_t x1, uint8_t y1) { // column address set ST7735_WriteCommand(ST7735_CASET); uint8_t data[] = { 0x00, x0 + ST7735_XSTART, 0x00, x1 + ST7735_XSTART }; ST7735_WriteData(data, sizeof(data)); // row address set ST7735_WriteCommand(ST7735_RASET); data[1] = y0 + ST7735_YSTART; data[3] = y1 + ST7735_YSTART; ST7735_WriteData(data, sizeof(data)); // write to RAM ST7735_WriteCommand(ST7735_RAMWR); } void ST7735_Init() { ST7735_Select(); ST7735_Reset(); ST7735_ExecuteCommandList(init_cmds1); ST7735_ExecuteCommandList(init_cmds2); ST7735_ExecuteCommandList(init_cmds3); ST7735_Unselect(); } void ST7735_DrawPixel(uint16_t x, uint16_t y, uint16_t color) { if((x >= ST7735_WIDTH) || (y >= ST7735_HEIGHT)) return; ST7735_Select(); ST7735_SetAddressWindow(x, y, x+1, y+1); uint8_t data[] = { color >> 8, color & 0xFF }; ST7735_WriteData(data, sizeof(data)); ST7735_Unselect(); } void ST7735_FillRectangle(uint16_t x, uint16_t y, uint16_t w, uint16_t h, uint16_t color) { // clipping if((x >= ST7735_WIDTH) || (y >= ST7735_HEIGHT)) return; if((x + w - 1) >= ST7735_WIDTH) w = ST7735_WIDTH - x; if((y + h - 1) >= ST7735_HEIGHT) h = ST7735_HEIGHT - y; ST7735_Select(); ST7735_SetAddressWindow(x, y, x+w-1, y+h-1); uint8_t data[] = { color >> 8, color & 0xFF }; HAL_GPIO_WritePin(ST7735_DC_GPIO_Port, ST7735_DC_Pin, GPIO_PIN_SET); for(y = h; y > 0; y--) { for(x = w; x > 0; x--) { HAL_SPI_Transmit(&ST7735_SPI_PORT, data, sizeof(data), HAL_MAX_DELAY); } } ST7735_Unselect(); } void ST7735_FillRectangleFast(uint16_t x, uint16_t y, uint16_t w, uint16_t h, uint16_t color) { // clipping if((x >= ST7735_WIDTH) || (y >= ST7735_HEIGHT)) return; if((x + w - 1) >= ST7735_WIDTH) w = ST7735_WIDTH - x; if((y + h - 1) >= ST7735_HEIGHT) h = ST7735_HEIGHT - y; ST7735_Select(); ST7735_SetAddressWindow(x, y, x+w-1, y+h-1); // Prepare whole line in a single buffer uint8_t pixel[] = { color >> 8, color & 0xFF }; uint8_t *line = malloc(w * sizeof(pixel)); for(x = 0; x < w; ++x) memcpy(line + x * sizeof(pixel), pixel, sizeof(pixel)); HAL_GPIO_WritePin(ST7735_DC_GPIO_Port, ST7735_DC_Pin, GPIO_PIN_SET); for(y = h; y > 0; y--) HAL_SPI_Transmit(&ST7735_SPI_PORT, line, w * sizeof(pixel), HAL_MAX_DELAY); free(line); ST7735_Unselect(); } void ST7735_FillScreen(uint16_t color) { ST7735_FillRectangle(0, 0, ST7735_WIDTH, ST7735_HEIGHT, color); } void ST7735_FillScreenFast(uint16_t color) { ST7735_FillRectangleFast(0, 0, ST7735_WIDTH, ST7735_HEIGHT, color); } void ST7735_DrawImage(uint16_t x, uint16_t y, uint16_t w, uint16_t h, const uint16_t* data) { if((x >= ST7735_WIDTH) || (y >= ST7735_HEIGHT)) return; if((x + w - 1) >= ST7735_WIDTH) return; if((y + h - 1) >= ST7735_HEIGHT) return; ST7735_Select(); ST7735_SetAddressWindow(x, y, x+w-1, y+h-1); ST7735_WriteData((uint8_t*)data, sizeof(uint16_t)*w*h); ST7735_Unselect(); } void ST7735_InvertColors(bool invert) { ST7735_Select(); ST7735_WriteCommand(invert ? ST7735_INVON : ST7735_INVOFF); ST7735_Unselect(); } void ST7735_SetGamma(uint8_t gamma) { ST7735_Select(); ST7735_WriteCommand(ST7735_GAMSET); ST7735_WriteData(&gamma, sizeof(gamma)); ST7735_Unselect(); }