22f59c4583
This version is the ASCII one but uses the LCD display that is attached to the board for a more colorful result. This example also zooms into a more "interesting" place in the set so the display stays interesting during the full 100 generations.
345 lines
9.2 KiB
C
345 lines
9.2 KiB
C
/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2014-2015 Chuck McManis <cmcmanis@mcmanis.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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 library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Initialize the ST Micro TFT Display using the SPI port
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <libopencm3/stm32/spi.h>
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/cm3/nvic.h>
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#include "clock.h"
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#include "sdram.h"
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#include "lcd.h"
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/*
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* SPI Port and GPIO Defined - for STM32F4-Disco
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*/
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/* #define LCD_RESET PA3 not used */
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#define LCD_CS PC2 /* CH 1 */
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#define LCD_SCK PF7 /* CH 2 */
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#define LCD_DC PD13 /* CH 4 */
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#define LCD_MOSI PF9 /* CH 3 */
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#define LCD_SPI SPI5
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#define FRAME_SIZE (LCD_WIDTH * LCD_HEIGHT)
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#define FRAME_SIZE_BYTES (FRAME_SIZE * 2)
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/* Simple double buffering, one frame is displayed, the
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* other being built.
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*/
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uint16_t *cur_frame;
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uint16_t *display_frame;
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/*
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* Drawing a pixel consists of storing a 16 bit value in the
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* memory used to hold the frame. This code computes the address
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* of the word to store, and puts in the value we pass to it.
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*/
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void
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lcd_draw_pixel(int x, int y, uint16_t color)
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{
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if ((x >= LCD_WIDTH) || (y >= LCD_HEIGHT)) {
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printf("Draw out of range [%d, %d]\n", x, y);
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while (1);
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}
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*(cur_frame + x + y * LCD_WIDTH) = color;
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}
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/*
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* Fun fact, same SPI port as the MEMS example but different
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* I/O pins. Clearly you can't use both the SPI port and the
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* MEMS chip at the same time in this example.
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*
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* For the STM32-DISCO board, SPI pins in use:
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* N/C - RESET
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* PC2 - CS (could be NSS but won't be)
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* PF7 - SCLK (AF5) SPI5
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* PD13 - DATA / CMD*
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* PF9 - MOSI (AF5) SPI5
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*/
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/*
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* This structure defines the sequence of commands to send
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* to the Display in order to initialize it. The AdaFruit
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* folks do something similar, it helps when debugging the
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* initialization sequence for the display.
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*/
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struct tft_command {
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uint16_t delay; /* If you need a delay after */
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uint8_t cmd; /* command to send */
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uint8_t n_args; /* How many arguments it has */
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};
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/* prototype for lcd_command */
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static void lcd_command(uint8_t cmd, int delay, int n_args,
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const uint8_t *args);
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/*
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* void lcd_command(cmd, delay, args, arg_ptr)
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*
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* All singing all dancing 'do a command' feature. Basically it
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* sends a command, and if args are present it sets 'data' and
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* sends those along too.
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*/
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static void
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lcd_command(uint8_t cmd, int delay, int n_args, const uint8_t *args)
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{
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int i;
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gpio_clear(GPIOC, GPIO2); /* Select the LCD */
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(void) spi_xfer(LCD_SPI, cmd);
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if (n_args) {
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gpio_set(GPIOD, GPIO13); /* Set the D/CX pin */
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for (i = 0; i < n_args; i++) {
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(void) spi_xfer(LCD_SPI, *(args+i));
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}
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}
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gpio_set(GPIOC, GPIO2); /* Turn off chip select */
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gpio_clear(GPIOD, GPIO13); /* always reset D/CX */
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if (delay) {
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msleep(delay); /* wait, if called for */
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}
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}
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/*
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* This creates a 'script' of commands that can be played
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* to the LCD controller to initialize it.
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* One array holds the 'argument' bytes, the other
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* the commands.
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* Keeping them in sync is essential
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*/
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static const uint8_t cmd_args[] = {
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0x00, 0x1B,
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0x0a, 0xa2,
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0x10,
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0x10,
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0x45, 0x15,
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0x90,
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/* 0xc8,*/ /* original */
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/* 11001000 = MY, MX, BGR */
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0x08,
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0xc2,
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0x55,
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0x0a, 0xa7, 0x27, 0x04,
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0x00, 0x00, 0x00, 0xef,
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0x00, 0x00, 0x01, 0x3f,
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/* 0x01, 0x00, 0x06,*/ /* original */
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0x01, 0x00, 0x00, /* modified to remove RGB mode */
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0x01,
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0x0F, 0x29, 0x24, 0x0C, 0x0E,
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0x09, 0x4E, 0x78, 0x3C, 0x09,
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0x13, 0x05, 0x17, 0x11, 0x00,
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0x00, 0x16, 0x1B, 0x04, 0x11,
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0x07, 0x31, 0x33, 0x42, 0x05,
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0x0C, 0x0A, 0x28, 0x2F, 0x0F,
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};
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/*
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* These are the commands we're going to send to the
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* display to initialize it. We send them all, in sequence
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* with occasional delays. Commands that require data bytes
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* as arguments, indicate how many bytes to pull out the
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* above array to include.
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*
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* The sequence was pieced together from the ST Micro demo
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* code, the data sheet, and other sources on the web.
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*/
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const struct tft_command initialization[] = {
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{ 0, 0xb1, 2 }, /* 0x00, 0x1B, */
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{ 0, 0xb6, 2 }, /* 0x0a, 0xa2, */
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{ 0, 0xc0, 1 }, /* 0x10, */
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{ 0, 0xc1, 1 }, /* 0x10, */
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{ 0, 0xc5, 2 }, /* 0x45, 0x15, */
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{ 0, 0xc7, 1 }, /* 0x90, */
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{ 0, 0x36, 1 }, /* 0xc8, */
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{ 0, 0xb0, 1 }, /* 0xc2, */
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{ 0, 0x3a, 1 }, /* 0x55 **added, pixel format 16 bpp */
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{ 0, 0xb6, 4 }, /* 0x0a, 0xa7, 0x27, 0x04, */
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{ 0, 0x2A, 4 }, /* 0x00, 0x00, 0x00, 0xef, */
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{ 0, 0x2B, 4 }, /* 0x00, 0x00, 0x01, 0x3f, */
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{ 0, 0xf6, 3 }, /* 0x01, 0x00, 0x06, */
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{ 200, 0x2c, 0 },
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{ 0, 0x26, 1}, /* 0x01, */
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{ 0, 0xe0, 15 }, /* 0x0F, 0x29, 0x24, 0x0C, 0x0E, */
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/* 0x09, 0x4E, 0x78, 0x3C, 0x09, */
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/* 0x13, 0x05, 0x17, 0x11, 0x00, */
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{ 0, 0xe1, 15 }, /* 0x00, 0x16, 0x1B, 0x04, 0x11, */
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/* 0x07, 0x31, 0x33, 0x42, 0x05, */
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/* 0x0C, 0x0A, 0x28, 0x2F, 0x0F, */
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{ 200, 0x11, 0 },
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{ 0, 0x29, 0 },
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{ 0, 0, 0 } /* cmd == 0 indicates last command */
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};
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/* prototype for initialize_display */
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static void initialize_display(const struct tft_command cmds[]);
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/*
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* void initialize_display(struct cmds[])
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*
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* This is the function that sends the entire list. It also puts
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* the commands it is sending to the console.
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*/
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static void
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initialize_display(const struct tft_command cmds[])
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{
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int i = 0;
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int arg_offset = 0;
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/* Initially arg offset is zero, so each time we 'consume'
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* a few bytes in the args array the offset is moved and
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* that changes the pointer we send to the command function.
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*/
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while (cmds[i].cmd) {
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lcd_command(cmds[i].cmd, cmds[i].delay, cmds[i].n_args,
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&cmd_args[arg_offset]);
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arg_offset += cmds[i].n_args;
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i++;
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}
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}
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/* prototype for test_image */
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static void test_image(void);
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/*
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* Interesting questions:
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* - How quickly can I write a full frame?
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* * Take the bits sent (16 * width * height)
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* and divide by the baud rate (10.25Mhz)
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* * Tests in main.c show that yes, it taks 74ms.
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*
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* Create non-random data in the frame buffer. In our case
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* a black background and a grid 16 pixels x 16 pixels of
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* white lines. No line on the right edge and bottom of screen.
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*/
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static void
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test_image(void)
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{
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int x, y;
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uint16_t pixel;
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for (x = 0; x < LCD_WIDTH; x++) {
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for (y = 0; y < LCD_HEIGHT; y++) {
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pixel = 0; /* all black */
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if ((x % 16) == 0) {
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pixel = 0xffff; /* all white */
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}
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if ((y % 16) == 0) {
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pixel = 0xffff; /* all white */
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}
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lcd_draw_pixel(x, y, pixel);
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}
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}
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}
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/*
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* void lcd_show_frame(void)
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*
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* Dump an entire frame to the LCD all at once. In theory you
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* could call this with DMA but that is made more difficult by
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* the implementation of SPI and the modules interpretation of
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* D/CX line.
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*/
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void lcd_show_frame(void)
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{
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uint16_t *t;
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uint8_t size[4];
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t = display_frame;
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display_frame = cur_frame;
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cur_frame = t;
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/* */
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size[0] = 0;
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size[1] = 0;
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size[2] = (LCD_WIDTH >> 8) & 0xff;
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size[3] = (LCD_WIDTH) & 0xff;
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lcd_command(0x2A, 0, 4, (const uint8_t *)&size[0]);
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size[0] = 0;
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size[1] = 0;
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size[2] = (LCD_HEIGHT >> 8) & 0xff;
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size[3] = LCD_HEIGHT & 0xff;
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lcd_command(0x2B, 0, 4, (const uint8_t *)&size[0]);
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lcd_command(0x2C, 0, FRAME_SIZE_BYTES, (const uint8_t *)display_frame);
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}
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/*
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* void lcd_spi_init(void)
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*
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* Initialize the SPI port, and the through that port
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* initialize the LCD controller. Note that this code
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* will expect to be able to draw into the SDRAM on
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* the board, so the sdram much be initialized before
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* calling this function.
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*
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* SPI Port and GPIO Defined - for STM32F4-Disco
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*
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* LCD_CS PC2
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* LCD_SCK PF7
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* LCD_DC PD13
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* LCD_MOSI PF9
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* LCD_SPI SPI5
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* LCD_WIDTH 240
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* LCD_HEIGHT 320
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*/
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void
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lcd_init(void)
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{
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/*
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* Set up the GPIO lines for the SPI port and
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* control lines on the display.
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*/
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rcc_periph_clock_enable(RCC_GPIOC | RCC_GPIOD | RCC_GPIOF);
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gpio_mode_setup(GPIOC, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO2);
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gpio_mode_setup(GPIOD, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO13);
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gpio_mode_setup(GPIOF, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO7 | GPIO9);
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gpio_set_af(GPIOF, GPIO_AF5, GPIO7 | GPIO9);
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cur_frame = (uint16_t *)(SDRAM_BASE_ADDRESS);
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display_frame = cur_frame + (LCD_WIDTH * LCD_HEIGHT);
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rcc_periph_clock_enable(RCC_SPI5);
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spi_init_master(LCD_SPI, SPI_CR1_BAUDRATE_FPCLK_DIV_4,
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SPI_CR1_CPOL_CLK_TO_0_WHEN_IDLE,
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SPI_CR1_CPHA_CLK_TRANSITION_1,
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SPI_CR1_DFF_8BIT,
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SPI_CR1_MSBFIRST);
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spi_enable_ss_output(LCD_SPI);
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spi_enable(LCD_SPI);
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/* Set up the display */
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initialize_display(initialization);
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/* create a test image */
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test_image();
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/* display it on the LCD */
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lcd_show_frame();
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}
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