142 lines
4.4 KiB
C
142 lines
4.4 KiB
C
/***************************************************************************
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* Copyright (C) 2021 - 2023 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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* Mathis Schmieder DB9MAT *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#include <stdio.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <peripherals/gpio.h>
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#include <interfaces/display.h>
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#include <interfaces/delays.h>
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#include <hwconfig.h>
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#include <spi_stm32.h>
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extern const struct spiDevice spi2;
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/**
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* \internal
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* Send one row of pixels to the display.
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* Pixels in framebuffer are stored "by rows", while display needs data to be
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* sent "by columns": this function performs the needed conversion.
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*
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* @param row: pixel row to be be sent.
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*/
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void SSD1306_renderRow(uint8_t row, uint8_t *frameBuffer)
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{
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for(uint16_t i = 0; i < 64; i++)
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{
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uint8_t out = 0;
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uint8_t tmp = frameBuffer[(i * 16) + (15 - row)];
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for(uint8_t j = 0; j < 8; j++)
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{
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out |= ((tmp >> (7-j)) & 0x01) << j;
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}
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spi_send(&spi2, &out, 1);
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}
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}
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void SSD1306_init()
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{
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gpio_setPin(LCD_CS);
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gpio_clearPin(LCD_RS);
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gpio_clearPin(LCD_RST); // Reset controller
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delayMs(50);
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gpio_setPin(LCD_RST);
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delayMs(50);
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static const uint8_t init[] =
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{
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0xAE, // SH110X_DISPLAYOFF
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0xD5, // SH110X_SETDISPLAYCLOCKDIV, 0x51
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0x51,
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0x81, // SH110X_SETCONTRAST, 0x4F
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0x4F,
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0xAD, // SH110X_DCDC, 0x8A
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0x8A,
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0xA0, // SH110X_SEGREMAP
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0xC0, // SH110X_COMSCANINC
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0xDC, // SH110X_SETDISPSTARTLINE, 0x0
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0x00,
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0xD3, // SH110X_SETDISPLAYOFFSET, 0x60
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0x60,
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0xD9, // SH110X_SETPRECHARGE, 0x22
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0x22,
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0xDB, // SH110X_SETVCOMDETECT, 0x35
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0x35,
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0xA8, // SH110X_SETMULTIPLEX, 0x3F
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0x3F,
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0xA4, // SH110X_DISPLAYALLON_RESUME
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0xA6, // SH110X_NORMALDISPLAY
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0xAF // SH110x_DISPLAYON
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};
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gpio_clearPin(LCD_CS);
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gpio_clearPin(LCD_DC);
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spi_send(&spi2, init, sizeof(init));
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gpio_setPin(LCD_CS);
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}
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void SSD1306_terminate()
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{
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}
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void SSD1306_renderRows(uint8_t startRow, uint8_t endRow, void *fb)
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{
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gpio_clearPin(LCD_CS);
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for(uint8_t row = startRow; row <= endRow; row++)
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{
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uint8_t cmd[3];
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cmd[0] = 0xB0 | row; /* Set Y position */
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cmd[1] = 0x00; /* Set X position */
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cmd[2] = 0x10;
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gpio_clearPin(LCD_RS); /* RS low -> command mode */
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spi_send(&spi2, cmd, sizeof(cmd));
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gpio_setPin(LCD_RS); /* RS high -> data mode */
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SSD1306_renderRow(row, (uint8_t *) fb);
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}
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gpio_setPin(LCD_CS);
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}
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void SSD1306_render(void *fb)
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{
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SSD1306_renderRows(0, (CONFIG_SCREEN_WIDTH / 8) - 1, fb);
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}
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void SSD1306_setContrast(uint8_t contrast)
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{
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uint8_t cmd[2];
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cmd[0] = 0x81; /* Set Electronic Volume */
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cmd[0] = contrast; /* Controller contrast range is 0 - 63 */
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gpio_clearPin(LCD_CS);
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gpio_clearPin(LCD_DC); /* RS low -> command mode */
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spi_send(&spi2, cmd, sizeof(cmd));
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gpio_setPin(LCD_CS);
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}
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