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drivers/st7735: move basic communication functions to drivers/lcd
This commit is contained in:
Gunar Schorcht
parent
c51496fe2e
commit
878af4f9a1
@ -83,7 +83,7 @@ extern "C" {
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#endif
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/**
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* @name ILI9341 display rotation modes
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* @name ST7735 display rotation modes
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* @{
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*/
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#define ST7735_ROTATION_VERT 0 /**< Vertical mode */
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@ -1,6 +1,7 @@
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/*
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* Copyright (C) 2018 Koen Zandberg
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* 2021 Francisco Molina
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* 2023 Gunar Schorcht
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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@ -16,16 +17,21 @@
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*
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* @author Koen Zandberg <koen@bergzand.net>
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* @author Francisco Molina <francois-xavier.molina@inria.fr>
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* @author Gunar Schorcht <gunar@schorcht.net>
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*
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* @}
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*/
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#include <assert.h>
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#include <string.h>
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#include "byteorder.h"
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#include "periph/spi.h"
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#include "ztimer.h"
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#include "kernel_defines.h"
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#include "ztimer.h"
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#if IS_USED(MODULE_LCD_SPI)
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#include "periph/spi.h"
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#endif
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#include "st7735.h"
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#include "st7735_internal.h"
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@ -35,18 +41,6 @@
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#define ENABLE_DEBUG 0
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#include "debug.h"
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static void _write_cmd(const lcd_t *dev, uint8_t cmd, const uint8_t *data,
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size_t len)
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{
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gpio_clear(dev->params->dcx_pin);
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spi_transfer_byte(dev->params->spi, dev->params->cs_pin, len ? true : false, cmd);
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gpio_set(dev->params->dcx_pin);
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if (len) {
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spi_transfer_bytes(dev->params->spi, dev->params->cs_pin, false, data,
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NULL, len);
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}
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}
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/* datasheet page 178, table converted to equation.
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* gvdd in 1mv increments: 4850 = 4.85V */
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static uint8_t _st7735_calc_pwrctl1(uint16_t gvdd)
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@ -72,92 +66,75 @@ static int _init(lcd_t *dev, const lcd_params_t *params)
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else {
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assert(params->lines <= 162);
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}
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dev->params = params;
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uint8_t command_params[4] = { 0 };
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gpio_init(dev->params->dcx_pin, GPIO_OUT);
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int res = spi_init_cs(dev->params->spi, dev->params->cs_pin);
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if (res != SPI_OK) {
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DEBUG("[st7735] init: error initializing the CS pin [%i]\n", res);
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return -1;
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}
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if (gpio_is_valid(dev->params->rst_pin)) {
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gpio_init(dev->params->rst_pin, GPIO_OUT);
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gpio_clear(dev->params->rst_pin);
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ztimer_sleep(ZTIMER_MSEC, 120);
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gpio_set(dev->params->rst_pin);
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}
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ztimer_sleep(ZTIMER_MSEC, 120);
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/* Acquire once at release at the end */
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spi_acquire(dev->params->spi, dev->params->cs_pin, dev->params->spi_mode,
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dev->params->spi_clk);
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/* Acquire once and release at the end */
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lcd_ll_acquire(dev);
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/* Soft Reset */
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_write_cmd(dev, LCD_CMD_SWRESET, NULL, 0);
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lcd_ll_write_cmd(dev, LCD_CMD_SWRESET, NULL, 0);
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ztimer_sleep(ZTIMER_MSEC, 120);
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/* Display off */
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_write_cmd(dev, LCD_CMD_DISPOFF, NULL, 0);
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lcd_ll_write_cmd(dev, LCD_CMD_DISPOFF, NULL, 0);
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/* PWRCTL1 */
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command_params[0] = _st7735_calc_pwrctl1(CONFIG_ST7735_GVDD);
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_write_cmd(dev, LCD_CMD_PWCTRL1, command_params, 1);
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lcd_ll_write_cmd(dev, LCD_CMD_PWCTRL1, command_params, 1);
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/* PWCTR2 VGH = 14.7V, VGL = -7.35V */
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command_params[0] = 0x01;
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command_params[1] = 0x05;
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_write_cmd(dev, LCD_CMD_PWCTRL2, command_params, 2);
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lcd_ll_write_cmd(dev, LCD_CMD_PWCTRL2, command_params, 2);
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/* PWCTR3 Opamp current small, Boost frequency */
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command_params[0] = 0x02;
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command_params[1] = 0x01;
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command_params[2] = 0x02;
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_write_cmd(dev, LCD_CMD_PWCTRL3, command_params, 3);
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lcd_ll_write_cmd(dev, LCD_CMD_PWCTRL3, command_params, 3);
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/* PWCTR6 */
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command_params[0] = 0x02;
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command_params[1] = 0x11;
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command_params[2] = 0x15;
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_write_cmd(dev, LCD_CMD_PWCTRL6, command_params, 3);
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lcd_ll_write_cmd(dev, LCD_CMD_PWCTRL6, command_params, 3);
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/* No display Inversion , Line inversion */
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command_params[0] = 0x07;
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_write_cmd(dev, LCD_CMD_INVCTR, command_params, 1);
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lcd_ll_write_cmd(dev, LCD_CMD_INVCTR, command_params, 1);
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/* VCOMCTL */
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command_params[0] = _st7735_calc_vmh(CONFIG_ST7735_VCOMH);
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command_params[1] = _st7735_calc_vml(CONFIG_ST7735_VCOML);
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_write_cmd(dev, LCD_CMD_VMCTRL1, command_params, 2);
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lcd_ll_write_cmd(dev, LCD_CMD_VMCTRL1, command_params, 2);
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command_params[0] = 0x86;
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_write_cmd(dev, LCD_CMD_VMCTRL2, command_params, 1);
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lcd_ll_write_cmd(dev, LCD_CMD_VMCTRL2, command_params, 1);
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/* Memory access CTL */
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command_params[0] = dev->params->rotation;
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command_params[0] |= dev->params->rgb ? 0 : LCD_MADCTL_BGR;
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_write_cmd(dev, LCD_CMD_MADCTL, command_params, 1);
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lcd_ll_write_cmd(dev, LCD_CMD_MADCTL, command_params, 1);
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/* Frame control */
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command_params[0] = 0x00;
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command_params[1] = 0x18;
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_write_cmd(dev, LCD_CMD_FRAMECTL1, command_params, 2);
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lcd_ll_write_cmd(dev, LCD_CMD_FRAMECTL1, command_params, 2);
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/* Display function control */
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command_params[0] = 0x08;
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command_params[1] = 0x82;
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/* number of lines, see datasheet p. 166 (DISCTRL::NL) */
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command_params[2] = (params->lines >> 3) - 1;
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_write_cmd(dev, LCD_CMD_DFUNC, command_params, 3);
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lcd_ll_write_cmd(dev, LCD_CMD_DFUNC, command_params, 3);
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/* Pixel format */
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command_params[0] = 0x55; /* 16 bit mode */
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_write_cmd(dev, LCD_CMD_PIXSET, command_params, 1);
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lcd_ll_write_cmd(dev, LCD_CMD_PIXSET, command_params, 1);
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command_params[0] = 0x01;
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_write_cmd(dev, LCD_CMD_GAMSET, command_params, 1);
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lcd_ll_write_cmd(dev, LCD_CMD_GAMSET, command_params, 1);
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/* Gamma correction */
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{
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@ -165,31 +142,33 @@ static int _init(lcd_t *dev, const lcd_params_t *params)
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0x02, 0x1c, 0x07, 0x12, 0x37, 0x32, 0x29, 0x2d,
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0x29, 0x25, 0x2B, 0x39, 0x00, 0x01, 0x03, 0x10
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};
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_write_cmd(dev, LCD_CMD_PGAMCTRL, gamma_pos,
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sizeof(gamma_pos));
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lcd_ll_write_cmd(dev, LCD_CMD_PGAMCTRL, gamma_pos,
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sizeof(gamma_pos));
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}
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{
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static const uint8_t gamma_neg[] = {
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0x03, 0x1d, 0x07, 0x06, 0x2E, 0x2C, 0x29, 0x2D,
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0x2E, 0x2E, 0x37, 0x3F, 0x00, 0x00, 0x02, 0x10
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};
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_write_cmd(dev, LCD_CMD_NGAMCTRL, gamma_neg,
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sizeof(gamma_neg));
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lcd_ll_write_cmd(dev, LCD_CMD_NGAMCTRL, gamma_neg,
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sizeof(gamma_neg));
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}
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if (dev->params->inverted) {
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_write_cmd(dev, LCD_CMD_DINVON, NULL, 0);
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lcd_ll_write_cmd(dev, LCD_CMD_DINVON, NULL, 0);
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}
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/* Sleep out (turn off sleep mode) */
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_write_cmd(dev, LCD_CMD_SLPOUT, NULL, 0);
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lcd_ll_write_cmd(dev, LCD_CMD_SLPOUT, NULL, 0);
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/* Normal display mode on */
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_write_cmd(dev, LCD_CMD_NORON, NULL, 0);
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lcd_ll_write_cmd(dev, LCD_CMD_NORON, NULL, 0);
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ztimer_sleep(ZTIMER_MSEC, 1);
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/* Display on */
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_write_cmd(dev, LCD_CMD_DISPON, NULL, 0);
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spi_release(dev->params->spi);
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lcd_ll_write_cmd(dev, LCD_CMD_DISPON, NULL, 0);
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/* Finally release the device */
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lcd_ll_release(dev);
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return 0;
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}
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@ -207,12 +186,15 @@ static void _set_area(const lcd_t *dev, uint16_t x1, uint16_t x2,
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params[0] = byteorder_htons(x1);
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params[1] = byteorder_htons(x2);
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_write_cmd(dev, LCD_CMD_CASET, (uint8_t *)params,
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sizeof(params));
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/* Function is called by a high level function of the LCD driver where
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* the device is already acquired. So we don't must acquire it here.
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* Therefore the low level write command function is called. */
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lcd_ll_write_cmd(dev, LCD_CMD_CASET, (uint8_t *)params,
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sizeof(params));
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params[0] = byteorder_htons(y1);
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params[1] = byteorder_htons(y2);
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_write_cmd(dev, LCD_CMD_PASET, (uint8_t *)params,
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sizeof(params));
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lcd_ll_write_cmd(dev, LCD_CMD_PASET, (uint8_t *)params,
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sizeof(params));
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}
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const lcd_driver_t lcd_st7735_driver = {
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