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RIOT/drivers/lcd/lcd.c

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/*
* Copyright (C) 2018 Koen Zandberg
* 2021 Francisco Molina
* 2023 Gunar Schorcht
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup drivers_lcd
* @{
*
* @file
* @brief Device driver implementation for the lcd display controller
*
* @author Koen Zandberg <koen@bergzand.net>
* @author Francisco Molina <francois-xavier.molina@inria.fr>
* @author Gunar Schorcht <gunar@schorcht.net>
*
* @}
*/
#include <assert.h>
#include <string.h>
#include "byteorder.h"
#include "kernel_defines.h"
#include "log.h"
#include "ztimer.h"
#if IS_USED(MODULE_LCD_SPI)
#include "periph/spi.h"
#endif
#include "lcd.h"
#include "lcd_internal.h"
#include "lcd_ll_par_gpio.h"
#define ENABLE_DEBUG 0
#include "debug.h"
#if IS_USED(MODULE_LCD_PARALLEL)
static void lcd_ll_par_write_byte(lcd_t *dev, bool cont, uint8_t out)
{
lcd_ll_par_driver.write_byte(dev, cont, out);
}
static uint8_t lcd_ll_par_read_byte(lcd_t *dev, bool cont)
{
return lcd_ll_par_driver.read_byte(dev, cont);
}
#if IS_USED(MODULE_LCD_PARALLEL_16BIT)
static void lcd_ll_par_write_word(lcd_t *dev, bool cont, uint16_t out)
{
lcd_ll_par_driver.write_word(dev, cont, out);
}
static uint16_t lcd_ll_par_read_word(lcd_t *dev, bool cont)
{
return lcd_ll_par_driver.read_word(dev, cont);
}
#endif /* IS_USED(MODULE_LCD_PARALLEL_16BIT) */
static void lcd_ll_par_write_bytes(lcd_t *dev, bool cont,
const void *data, size_t len)
{
assert(len);
const uint8_t *data_out = data;
#if IS_USED(MODULE_LCD_PARALLEL_16BIT)
if (dev->word_access) {
/* len has to be a multiple of two for word access */
assert((len % 2) == 0);
for (size_t i = 0; i < len; i += 2) {
/* data[i] is the high byte and data[i+1] is the low byte in BE */
uint16_t out_word = (data_out[i] << 8) + data_out[i + 1];
lcd_ll_par_write_word(dev, i == (len - 2) ? cont : true, out_word);
}
return;
}
#endif /* IS_USED(MODULE_LCD_PARALLEL_16BIT) */
for (size_t i = 0; i < len; i++) {
lcd_ll_par_write_byte(dev, i == (len - 1) ? cont : true, data_out[i]);
}
}
static void lcd_ll_par_read_bytes(lcd_t *dev, bool cont,
void *data, size_t len)
{
assert(len);
uint8_t *data_in = data;
#if IS_USED(MODULE_LCD_PARALLEL_16BIT)
if (dev->word_access) {
/* len has to be a multiple of two for word access */
assert((len % 2) == 0);
for (size_t i = 0; i < len; i += 2) {
uint16_t in_word = lcd_ll_par_read_word(dev, i == (len - 2) ? cont : true);
data_in[i] = in_word >> 8; /* data[i] is the high byte in BE */
data_in[i + 1] = in_word & 0xff; /* data[i+1] is the low byte in BE */
}
return;
}
#endif /* IS_USED(MODULE_LCD_PARALLEL_16BIT) */
for (size_t i = 0; i < len; i++) {
data_in[i] = lcd_ll_par_read_byte(dev, i == (len - 1) ? cont : true);
}
}
#endif /* IS_USED(MODULE_LCD_PARALLEL) */
static inline void lcd_ll_write_byte(lcd_t *dev, bool cont, uint8_t data)
{
#if IS_USED(MODULE_LCD_SPI)
if (dev->params->spi != SPI_UNDEF) {
/* SPI serial interface is used */
spi_transfer_byte(dev->params->spi, dev->params->cs_pin, cont, data);
}
else {
#endif
#if IS_USED(MODULE_LCD_PARALLEL)
/* MCU 8080 8-/16-bit parallel interface is used */
lcd_ll_par_write_byte(dev, cont, data);
#endif
#if IS_USED(MODULE_LCD_SPI)
}
#endif
}
static inline void lcd_ll_write_bytes(lcd_t *dev, bool cont,
const void *data, size_t len)
{
#if IS_USED(MODULE_LCD_SPI)
if (dev->params->spi != SPI_UNDEF) {
/* SPI serial interface is used */
spi_transfer_bytes(dev->params->spi,
dev->params->cs_pin, cont, data, NULL, len);
}
else {
#endif
#if IS_USED(MODULE_LCD_PARALLEL)
/* MCU 8080 8-/16-bit parallel interface is used */
lcd_ll_par_write_bytes(dev, cont, data, len);
#endif
#if IS_USED(MODULE_LCD_SPI)
}
#endif
}
static inline void lcd_ll_read_bytes(lcd_t *dev, bool cont,
void *data, size_t len)
{
#if IS_USED(MODULE_LCD_SPI)
if (dev->params->spi != SPI_UNDEF) {
/* SPI serial interface is used */
/* Dummy read */
spi_transfer_byte(dev->params->spi,
dev->params->cs_pin, true, 0x00);
spi_transfer_bytes(dev->params->spi,
dev->params->cs_pin, cont, NULL, data, len);
}
else {
#endif /* IS_USED(MODULE_LCD_SPI) */
#if IS_USED(MODULE_LCD_PARALLEL)
/* MCU 8080 8-/16-bit parallel interface is used */
/* switch GPIO mode to input */
lcd_ll_par_driver.set_data_dir(dev, false);
/* Dummy read */
lcd_ll_par_read_byte(dev, true);
lcd_ll_par_read_bytes(dev, cont, data, len);
/* switch GPIO mode back to output */
lcd_ll_par_driver.set_data_dir(dev, true);
#endif
#if IS_USED(MODULE_LCD_SPI)
}
#endif
}
static void lcd_ll_cmd_start(lcd_t *dev, uint8_t cmd, bool cont)
{
#if IS_USED(MODULE_LCD_PARALLEL)
if (dev->params->mode != LCD_IF_SPI) {
lcd_ll_par_driver.cmd_start(dev, cmd, cont);
}
else {
#endif
gpio_clear(dev->params->dcx_pin);
lcd_ll_write_byte(dev, cont, cmd);
gpio_set(dev->params->dcx_pin);
#if IS_USED(MODULE_LCD_PARALLEL)
}
#endif
#if IS_USED(MODULE_LCD_PARALLEL_16BIT)
/* only the RAMRD and RAMRDC commands use 16-bit data access */
if (((cmd == LCD_CMD_RAMWR) || (cmd == LCD_CMD_RAMWRC) ||
(cmd == LCD_CMD_RAMRD) || (cmd == LCD_CMD_RAMRDC)) &&
(dev->params->mode == LCD_IF_PARALLEL_16BIT)) {
dev->word_access = true;
}
#endif
}
static void lcd_ll_set_area_default(lcd_t *dev, uint16_t x1, uint16_t x2,
uint16_t y1, uint16_t y2)
{
be_uint16_t params[2];
x1 += dev->params->offset_x;
x2 += dev->params->offset_x;
y1 += dev->params->offset_y;
y2 += dev->params->offset_y;
/* Function is called by a high level function of the LCD driver where
* the device is already acquired. So we don't must acquire it here.
* Therefore the low level write command function is called. */
params[0] = byteorder_htons(x1);
params[1] = byteorder_htons(x2);
lcd_ll_write_cmd(dev, LCD_CMD_CASET, (uint8_t *)params,
sizeof(params));
params[0] = byteorder_htons(y1);
params[1] = byteorder_htons(y2);
lcd_ll_write_cmd(dev, LCD_CMD_PASET, (uint8_t *)params,
sizeof(params));
}
void lcd_ll_set_area(lcd_t *dev, uint16_t x1, uint16_t x2, uint16_t y1, uint16_t y2)
{
if (dev->driver->set_area) {
dev->driver->set_area(dev, x1, x2, y1, y2);
}
else {
lcd_ll_set_area_default(dev, x1, x2, y1, y2);
}
}
void lcd_ll_acquire(lcd_t *dev)
{
#if IS_USED(MODULE_LCD_SPI)
if (dev->params->spi != SPI_UNDEF) {
/* SPI serial interface is used */
spi_acquire(dev->params->spi, dev->params->cs_pin,
dev->params->spi_mode, dev->params->spi_clk);
}
else {
#endif
#if IS_USED(MODULE_LCD_PARALLEL)
/* MCU 8080 8-/16-bit parallel interface is used */
mutex_lock(&dev->lock);
#endif
#if IS_USED(MODULE_LCD_SPI)
}
#endif
}
void lcd_ll_release(lcd_t *dev)
{
#if IS_USED(MODULE_LCD_PARALLEL_16BIT)
/* reset word to byte access */
dev->word_access = false;
#endif
#if IS_USED(MODULE_LCD_SPI)
if (dev->params->spi != SPI_UNDEF) {
/* SPI serial interface is used */
spi_release(dev->params->spi);
}
else {
#endif
#if IS_USED(MODULE_LCD_PARALLEL)
/* MCU 8080 8-/16-bit parallel interface is used */
mutex_unlock(&dev->lock);
#endif
#if IS_USED(MODULE_LCD_SPI)
}
#endif
}
void lcd_ll_write_cmd(lcd_t *dev, uint8_t cmd, const uint8_t *data,
size_t len)
{
DEBUG("[%s] command 0x%02x (%u) ", __func__, cmd, len);
if (IS_USED(ENABLE_DEBUG) && len) {
for (uint8_t i = 0; i < len; i++) {
DEBUG("0x%02x ", data[i]);
}
}
DEBUG("\n");
lcd_ll_cmd_start(dev, cmd, len ? true : false);
if (len) {
lcd_ll_write_bytes(dev, false, data, len);
}
}
void lcd_ll_read_cmd(lcd_t *dev, uint8_t cmd, uint8_t *data, size_t len)
{
assert(len);
DEBUG("[%s] command 0x%02x (%u) ", __func__, cmd, len);
lcd_ll_cmd_start(dev, cmd, true);
lcd_ll_read_bytes(dev, false, data, len);
if (IS_USED(ENABLE_DEBUG) && len) {
for (uint8_t i = 0; i < len; i++) {
DEBUG("0x%02x ", data[i]);
}
}
DEBUG("\n");
}
int lcd_init(lcd_t *dev, const lcd_params_t *params)
{
dev->params = params;
#if IS_USED(MODULE_LCD_SPI)
if (dev->params->spi != SPI_UNDEF) {
assert(gpio_is_valid(dev->params->dcx_pin));
gpio_init(dev->params->dcx_pin, GPIO_OUT);
/* SPI serial interface is used */
int res = spi_init_cs(dev->params->spi, dev->params->cs_pin);
if (res != SPI_OK) {
DEBUG("[st7735] init: error initializing the CS pin [%i]\n", res);
return -1;
}
}
else {
#endif /* IS_USED(MODULE_LCD_SPI) */
#if IS_USED(MODULE_LCD_PARALLEL)
mutex_init(&dev->lock);
#if IS_USED(MODULE_LCD_PARALLEL_16BIT)
dev->word_access = false;
#endif /* IS_USED(MODULE_LCD_PARALLEL_16BIT) */
/* Low-level parallel interface initialization */
lcd_ll_par_driver.init(dev);
/* set output data direction */
lcd_ll_par_driver.set_data_dir(dev, true);
#else /* IS_USED(MODULE_LCD_PARALLEL) */
LOG_ERROR("[lcd] either lcd_parallel or lcd_spi has to be enabled");
assert(false);
#endif
#if IS_USED(MODULE_LCD_SPI)
}
#endif
if (gpio_is_valid(dev->params->rst_pin)) {
gpio_init(dev->params->rst_pin, GPIO_OUT);
gpio_clear(dev->params->rst_pin);
ztimer_sleep(ZTIMER_MSEC, 120);
gpio_set(dev->params->rst_pin);
}
ztimer_sleep(ZTIMER_MSEC, 120);
/* controller-specific init function has to be defined */
assert(dev->driver->init);
return dev->driver->init(dev, params);
}
void lcd_write_cmd(lcd_t *dev, uint8_t cmd, const uint8_t *data,
size_t len)
{
lcd_ll_acquire(dev);
lcd_ll_write_cmd(dev, cmd, data, len);
lcd_ll_release(dev);
}
void lcd_read_cmd(lcd_t *dev, uint8_t cmd, uint8_t *data, size_t len)
{
lcd_ll_acquire(dev);
lcd_ll_read_cmd(dev, cmd, data, len);
lcd_ll_release(dev);
}
void lcd_fill(lcd_t *dev, uint16_t x1, uint16_t x2, uint16_t y1,
uint16_t y2, uint16_t color)
{
/* Send fill area to the display */
/* Calculate number of pixels */
int32_t num_pix = (x2 - x1 + 1) * (y2 - y1 + 1);
DEBUG("[lcd]: Write x1: %" PRIu16 ", x2: %" PRIu16 ", "
"y1: %" PRIu16 ", y2: %" PRIu16 ". Num pixels: %lu\n",
x1, x2, y1, y2, (unsigned long)num_pix);
/* Send fill area to the display */
lcd_ll_acquire(dev);
lcd_ll_set_area(dev, x1, x2, y1, y2);
/* Memory access command */
lcd_ll_cmd_start(dev, LCD_CMD_RAMWR, true);
if (IS_ACTIVE(CONFIG_LCD_LE_MODE)) {
color = htons(color);
}
for (int i = 0; i < (num_pix - 1); i++) {
lcd_ll_write_bytes(dev, true, (uint8_t *)&color, sizeof(color));
}
lcd_ll_write_bytes(dev, false, (uint8_t *)&color, sizeof(color));
lcd_ll_release(dev);
}
void lcd_pixmap(lcd_t *dev, uint16_t x1, uint16_t x2,
uint16_t y1, uint16_t y2, const uint16_t *color)
{
size_t num_pix = (x2 - x1 + 1) * (y2 - y1 + 1);
DEBUG("[lcd]: Write x1: %" PRIu16 ", x2: %" PRIu16 ", "
"y1: %" PRIu16 ", y2: %" PRIu16 ". Num pixels: %lu\n",
x1, x2, y1, y2, (unsigned long)num_pix);
lcd_ll_acquire(dev);
/* Send fill area to the display */
lcd_ll_set_area(dev, x1, x2, y1, y2);
/* Memory access command */
lcd_ll_cmd_start(dev, LCD_CMD_RAMWR, true);
if (IS_ACTIVE(CONFIG_LCD_LE_MODE)) {
for (size_t i = 0; i < num_pix - 1; i++) {
uint16_t ncolor = htons(*(color + i));
lcd_ll_write_bytes(dev, true, &ncolor, sizeof(uint16_t));
}
uint16_t ncolor = htons(*(color + num_pix - 1));
lcd_ll_write_bytes(dev, false, &ncolor, sizeof(uint16_t));
}
else {
lcd_ll_write_bytes(dev, false, (const uint8_t *)color, num_pix * 2);
}
lcd_ll_release(dev);
}
void lcd_invert_on(lcd_t *dev)
{
uint8_t command = (dev->params->inverted) ? LCD_CMD_DINVOFF
: LCD_CMD_DINVON;
lcd_write_cmd(dev, command, NULL, 0);
}
void lcd_invert_off(lcd_t *dev)
{
uint8_t command = (dev->params->inverted) ? LCD_CMD_DINVON
: LCD_CMD_DINVOFF;
lcd_write_cmd(dev, command, NULL, 0);
}
void lcd_set_brightness(lcd_t *dev, uint8_t brightness)
{
lcd_write_cmd(dev, LCD_CMD_WRDISBV, &brightness, 1);
uint8_t param = 0x26;
lcd_write_cmd(dev, LCD_CMD_WRCTRLD, &param, 1);
}
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