315 lines
9.5 KiB
C
315 lines
9.5 KiB
C
/***************************************************************************
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* Copyright (C) 2024 - 2025 by Silvano Seva IU2KWO *
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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 <peripherals/gpio.h>
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#include <interfaces/display.h>
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#include <interfaces/delays.h>
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#include <interfaces/platform.h>
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#include <backlight.h>
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#include <hwconfig.h>
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#include <string.h>
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enum ST775RCmd
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{
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ST775R_CMD_NOP = 0x00,
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ST775R_CMD_SWRESET = 0x01,
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ST775R_CMD_RDID = 0x04,
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ST775R_CMD_RDDST = 0x09,
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ST775R_CMD_RDDPM = 0x0A,
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ST775R_CMD_RDDMADCTL = 0x0B,
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ST775R_CMD_RDDCOLMOD = 0x0C,
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ST775R_CMD_RDDIM = 0x0D,
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ST775R_CMD_RDDSM = 0x0E,
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ST775R_CMD_SLPIN = 0x10,
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ST775R_CMD_SLPOUT = 0x11,
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ST775R_CMD_PTLON = 0x12,
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ST775R_CMD_NORON = 0x13,
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ST775R_CMD_INVOFF = 0x20,
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ST775R_CMD_INVON = 0x21,
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ST775R_CMD_GAMSET = 0x26,
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ST775R_CMD_DISPOFF = 0x28,
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ST775R_CMD_DISPON = 0x29,
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ST775R_CMD_CASET = 0x2A,
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ST775R_CMD_RASET = 0x2B,
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ST775R_CMD_RAMWR = 0x2C,
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ST775R_CMD_RGBSET = 0x2D,
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ST775R_CMD_RAMRD = 0x2E,
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ST775R_CMD_PTLAR = 0x30,
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ST775R_CMD_TEOFF = 0x34,
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ST775R_CMD_TEON = 0x35,
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ST775R_CMD_MADCTL = 0x36,
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ST775R_CMD_IDMOFF = 0x38,
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ST775R_CMD_IDMON = 0x39,
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ST775R_CMD_COLMOD = 0x3A,
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ST775R_CMD_RDID1 = 0xDA,
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ST775R_CMD_RDID2 = 0xDB,
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ST775R_CMD_RDID3 = 0xDC
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};
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static inline void sendCmd(uint8_t cmd)
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{
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// Set D/C low (command mode), clear WR and data lines
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GPIOD->BSRR = 0x30FF0000;
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#ifdef PLATFORM_CS7000P
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asm volatile(" mov r1, #65 \n"
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#else
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asm volatile(" mov r1, #21 \n"
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#endif
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"___loop_d: cmp r1, #0 \n"
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" itt ne \n"
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" subne r1, r1, #1 \n"
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" bne ___loop_d \n":::"r1");
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GPIOD->BSRR = cmd;
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asm volatile(" mov r1, #5 \n"
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"___loop_1: cmp r1, #0 \n"
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" itt ne \n"
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" subne r1, r1, #1 \n"
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" bne ___loop_1 \n":::"r1");
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GPIOD->BSRR = (1 << 13);
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}
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static inline void sendData(uint8_t val)
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{
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// Set D/C high (data mode), clear WR and data lines
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GPIOD->BSRR = 0x20FF1000;
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#ifdef PLATFORM_CS7000P
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asm volatile(" mov r1, #65 \n"
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#else
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asm volatile(" mov r1, #21 \n"
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#endif
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"___loop_e: cmp r1, #0 \n"
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" itt ne \n"
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" subne r1, r1, #1 \n"
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" bne ___loop_e \n":::"r1");
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GPIOD->BSRR = val;
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asm volatile(" mov r1, #5 \n"
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"___loop_2: cmp r1, #0 \n"
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" itt ne \n"
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" subne r1, r1, #1 \n"
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" bne ___loop_2 \n":::"r1");
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GPIOD->BSRR = (1 << 13);
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}
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void display_init()
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{
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backlight_init();
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/* Set up gpios */
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gpio_setMode(LCD_D0, OUTPUT);
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gpio_setMode(LCD_D1, OUTPUT);
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gpio_setMode(LCD_D2, OUTPUT);
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gpio_setMode(LCD_D3, OUTPUT);
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gpio_setMode(LCD_D4, OUTPUT);
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gpio_setMode(LCD_D5, OUTPUT);
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gpio_setMode(LCD_D6, OUTPUT);
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gpio_setMode(LCD_D7, OUTPUT);
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gpio_setMode(LCD_WR, OUTPUT);
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gpio_setMode(LCD_RD, OUTPUT);
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gpio_setMode(LCD_DC, OUTPUT);
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gpio_setMode(LCD_RST, OUTPUT);
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gpio_setMode(LCD_CS, OUTPUT);
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gpio_setOutputSpeed(LCD_D0, HIGH);
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gpio_setOutputSpeed(LCD_D1, HIGH);
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gpio_setOutputSpeed(LCD_D2, HIGH);
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gpio_setOutputSpeed(LCD_D3, HIGH);
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gpio_setOutputSpeed(LCD_D4, HIGH);
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gpio_setOutputSpeed(LCD_D5, HIGH);
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gpio_setOutputSpeed(LCD_D6, HIGH);
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gpio_setOutputSpeed(LCD_D7, HIGH);
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gpio_setOutputSpeed(LCD_WR, HIGH);
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gpio_setOutputSpeed(LCD_RD, HIGH);
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gpio_setOutputSpeed(LCD_DC, HIGH);
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gpio_setOutputSpeed(LCD_RST, HIGH);
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gpio_setOutputSpeed(LCD_CS, HIGH);
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gpio_clearPin(LCD_RST); /* Put LCD in reset mode */
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gpio_setPin(LCD_CS); /* CS idle state is high level */
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gpio_setPin(LCD_DC); /* Idle state for DC line */
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gpio_setPin(LCD_WR); /* Idle state for WR line */
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gpio_setPin(LCD_RD); /* Idle state for RD line */
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gpio_setPin(LCD_RST); /* Exit from reset */
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delayMs(10);
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gpio_clearPin(LCD_CS);
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sendCmd(ST775R_CMD_SWRESET);
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sendCmd(0xb1); /* Undocumented command */
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sendData(5);
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sendData(8);
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sendData(5);
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sendCmd(0xb2); /* Undocumented command */
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sendData(5);
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sendData(8);
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sendData(5);
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sendCmd(0xb3); /* Undocumented command */
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sendData(5);
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sendData(8);
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sendData(5);
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sendData(5);
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sendData(8);
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sendData(5);
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sendCmd(0xb4); /* Undocumented command */
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sendData(0);
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sendCmd(0xb6); /* Undocumented command */
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sendData(0xb4);
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sendData(0xf0);
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sendCmd(0xc0); /* Undocumented command */
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sendData(0xa2);
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sendData(2);
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/* sendData(0x85); TODO: see original fw */
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sendData(0x84);
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sendCmd(0xc1); /* Undocumented command */
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sendData(5);
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sendCmd(0xc2); /* Undocumented command */
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sendData(10);
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sendData(0);
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sendCmd(0xc3); /* Undocumented command */
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sendData(0x8a);
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sendData(0x2a);
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sendCmd(0xc4); /* Undocumented command */
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sendData(0x8a);
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sendData(0xee);
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sendCmd(0xc5); /* Undocumented command */
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sendData(0xe);
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sendCmd(ST775R_CMD_MADCTL);
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sendData(0xB0);
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sendCmd(0xe0); /* Undocumented command */
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sendData(5);
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/* sendData(0x28); TODO: see original fw */
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/* sendData(0x28); TODO: see original fw */
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sendData(0x16);
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sendData(0xf);
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sendData(0x18);
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sendData(0x2f);
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sendData(0x28);
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sendData(0x20);
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sendData(0x22);
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sendData(0x1f);
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sendData(0x1b);
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sendData(0x23);
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sendData(0x37);
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sendData(0);
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sendData(7);
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sendData(2);
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sendData(0x10);
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sendCmd(0xe1); /* Undocumented command */
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sendData(7);
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/* sendData(0x28); TODO: see original fw */
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/* sendData(0x28); TODO: see original fw */
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sendData(0x1b);
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sendData(0xf);
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sendData(0x17);
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sendData(0x33);
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sendData(0x2c);
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sendData(0x29);
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sendData(0x2e);
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sendData(0x30);
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sendData(0x30);
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sendData(0x39);
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sendData(0x3f);
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sendData(0);
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sendData(7);
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sendData(3);
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sendData(0x10);
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sendCmd(0xf0); /* Undocumented command */
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sendData(1);
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sendCmd(0xf6); /* Undocumented command */
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sendData(0);
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sendCmd(ST775R_CMD_COLMOD);
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sendData(0x05); /* 16bpp - RGB 565 */
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sendCmd(ST775R_CMD_RASET);
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sendData(0);
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sendData(0);
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sendData(0);
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sendData(0x7f); /* 128 rows */
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sendCmd(ST775R_CMD_CASET);
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sendData(0);
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sendData(0);
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sendData(0);
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sendData(0x9f); /* 160 columns */
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/* Exit from sleep */
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sendCmd(ST775R_CMD_SLPOUT);
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delayMs(120);
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/* Enable display */
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sendCmd(ST775R_CMD_DISPON);
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gpio_setPin(LCD_CS);
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}
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void display_terminate()
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{
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}
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void display_renderRows(uint8_t startRow, uint8_t endRow, void *fb)
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{
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/*
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* Put screen data lines back to output mode, since they are in common with
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* keyboard buttons and the keyboard driver sets them as inputs.
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*/
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gpio_setMode(LCD_D0, OUTPUT);
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gpio_setMode(LCD_D1, OUTPUT);
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gpio_setMode(LCD_D2, OUTPUT);
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gpio_setMode(LCD_D3, OUTPUT);
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gpio_setMode(LCD_D4, OUTPUT);
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gpio_setMode(LCD_D5, OUTPUT);
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gpio_setMode(LCD_D6, OUTPUT);
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gpio_setMode(LCD_D7, OUTPUT);
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/*
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* Select the display, configure start and end rows in display driver and
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* write to display memory.
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*/
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gpio_clearPin(LCD_CS);
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sendCmd(ST775R_CMD_RASET);
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sendData(0x00);
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sendData(startRow);
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sendData(0x00);
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sendData(endRow);
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sendCmd(ST775R_CMD_RAMWR);
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for(uint8_t y = startRow; y < endRow; y++)
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{
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for(uint8_t x = 0; x < CONFIG_SCREEN_WIDTH; x++)
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{
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size_t pos = x + y * CONFIG_SCREEN_WIDTH;
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uint16_t pixel = ((uint16_t *) fb)[pos];
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sendData((pixel >> 8) & 0xff);
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sendData(pixel & 0xff);
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}
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}
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gpio_setPin(LCD_CS);
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}
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void display_render(void *fb)
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{
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display_renderRows(0, CONFIG_SCREEN_HEIGHT, fb);
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}
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void display_setContrast(uint8_t contrast)
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{
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/* This controller does not support contrast regulation */
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(void) contrast;
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}
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