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The Echo R1 is a new open-hardware music player design, based on the STM32H743 microcontroller. Schematics and hardware documentation for it can be found here: - https://github.com/amachronic/echoplayer This is an incomplete port. The bootloader can be loaded using OpenOCD and it can draw to the LCD using SPI. SDRAM is working but hasn't been extensively tested. Change-Id: Ifd2bee15c49868fbc989683d3ca14dce48bf3e18
134 lines
3.5 KiB
C
134 lines
3.5 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2025 Aidan MacDonald
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "system.h"
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#include "kernel.h"
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#include "lcd.h"
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#include "spi-stm32h7.h"
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#include "gpio-stm32h7.h"
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#include "stm32h7/rcc.h"
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struct stm_spi_config spi_cfg = {
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.num = STM_SPI5,
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.mode = STM_SPIMODE_HALF_DUPLEX,
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.proto = STM_SPIPROTO_MOTOROLA,
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.frame_bits = 9,
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.hw_cs_output = true,
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};
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struct stm_spi spi;
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#define ili_cmd(cmd, ...) \
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do { \
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uint16_t arr[] = {cmd, __VA_ARGS__}; \
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for (size_t i = 1; i < ARRAYLEN(arr); ++i) \
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arr[i] |= 0x100; \
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stm_spi_transmit(&spi, arr, sizeof(arr)); \
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} while (0)
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static void set_row_column_address(int x, int y, int w, int h)
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{
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ili_cmd(0x2a, x >> 8, x & 0xff, (w-1) >> 8, (w-1) & 0xff);
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ili_cmd(0x2b, y >> 8, y & 0xff, (h-1) >> 8, (h-1) & 0xff);
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}
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void lcd_init_device(void)
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{
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/* Clock configuration -- should be 12 MHz (SPI clock is 1/2 of HSE) */
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st_writef(RCC_D2CCIP1R, SPI45SEL_V(HSE));
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st_writef(RCC_APB2ENR, SPI5EN(1));
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/* Configure SPI bus */
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stm_spi_init(&spi, &spi_cfg);
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/* Ensure controller is reset */
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gpio_set_level(GPIO_LCD_RESET, 0);
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sleep(12);
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gpio_set_level(GPIO_LCD_RESET, 1);
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sleep(12);
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/* Sleep out */
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ili_cmd(0x11);
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sleep(12);
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/* memory access control (X/Y invert, BGR panel) */
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ili_cmd(0x36, 0xc8);
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/* pixel format set (16bpp) */
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ili_cmd(0x3a, 0x55);
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/* display ON */
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ili_cmd(0x29);
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}
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bool lcd_active(void)
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{
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return true;
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}
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void lcd_update(void)
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{
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lcd_update_rect(0, 0, LCD_WIDTH, LCD_HEIGHT);
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}
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void lcd_update_rect(int x, int y, int width, int height)
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{
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/* row buffer to minimize time wasted in post-transaction delay */
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static uint16_t row[LCD_WIDTH * 2];
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if (x < 0)
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x = 0;
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else if (x >= LCD_WIDTH)
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x = LCD_WIDTH - 1;
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if (y < 0)
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y = 0;
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else if (y >= LCD_HEIGHT)
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y = LCD_HEIGHT - 1;
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if (width > LCD_WIDTH - x)
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width = LCD_WIDTH - x;
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if (height > LCD_HEIGHT - y)
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height = LCD_HEIGHT - y;
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set_row_column_address(x, y, width, height);
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ili_cmd(0x2c);
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for (int py = y; py < height; ++py)
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{
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for (int px = x; px < width; ++px)
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{
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fb_data *fb = FBADDR(px, py);
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uint16_t *data = &row[px * 2];
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data[0] = 0x100;
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data[0] |= (FB_UNPACK_RED(*fb) >> 3) << 3;
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data[0] |= (FB_UNPACK_GREEN(*fb) >> 5);
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data[1] = 0x100;
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data[1] |= ((FB_UNPACK_GREEN(*fb) >> 2) & 0x7) << 5;
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data[1] |= (FB_UNPACK_BLUE(*fb) >> 3);
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}
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stm_spi_transmit(&spi, &row[x * 2], width * sizeof(*row) * 2);
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}
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}
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