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/*
* SPDX-FileCopyrightText: 2021-2025 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdlib.h>
#include <string.h>
#include <sys/cdefs.h>
#include "sdkconfig.h"
#if CONFIG_LCD_ENABLE_DEBUG_LOG
// The local log level must be defined before including esp_log.h
// Set the maximum log level for this source file
#define LOG_LOCAL_LEVEL ESP_LOG_DEBUG
#endif
#include "esp_lcd_panel_io_interface.h"
#include "esp_lcd_panel_io.h"
#include "driver/spi_master.h"
#include "driver/gpio.h"
#include "hal/gpio_ll.h"
#include "esp_log.h"
#include "esp_check.h"
#include "esp_lcd_common.h"
static const char *TAG = "lcd_panel.io.spi";
static esp_err_t panel_io_spi_rx_param(esp_lcd_panel_io_t *io, int lcd_cmd, void *param, size_t param_size);
static esp_err_t panel_io_spi_tx_param(esp_lcd_panel_io_t *io, int lcd_cmd, const void *param, size_t param_size);
static esp_err_t panel_io_spi_tx_color(esp_lcd_panel_io_t *io, int lcd_cmd, const void *color, size_t color_size);
static esp_err_t panel_io_spi_del(esp_lcd_panel_io_t *io);
static void lcd_spi_pre_trans_cb(spi_transaction_t *trans);
static void lcd_spi_post_trans_color_cb(spi_transaction_t *trans);
static esp_err_t panel_io_spi_register_event_callbacks(esp_lcd_panel_io_handle_t io, const esp_lcd_panel_io_callbacks_t *cbs, void *user_ctx);
typedef struct {
spi_transaction_t base;
struct {
unsigned int dc_gpio_level: 1;
unsigned int en_trans_done_cb: 1;
} flags;
} lcd_spi_trans_descriptor_t;
typedef struct {
esp_lcd_panel_io_t base; // Base class of generic lcd panel io
spi_device_handle_t spi_dev; // SPI device handle
size_t spi_trans_max_bytes; // Maximum bytes that can be transmitted in one spi transaction
int dc_gpio_num; // D/C line GPIO number
esp_lcd_panel_io_color_trans_done_cb_t on_color_trans_done; // User register's callback, invoked when color data trans done
void *user_ctx; // User's private data, passed directly to callback on_color_trans_done
size_t queue_size; // Size of transaction queue
size_t num_trans_inflight; // Number of transactions that are undergoing (the descriptor not recycled yet)
int lcd_cmd_bits; // Bit width of LCD command
int lcd_param_bits; // Bit width of LCD parameter
uint8_t cs_ena_pretrans; // Amount of SPI bit-cycles the cs should be activated before the transmission (0-16)
uint8_t cs_ena_posttrans; // Amount of SPI bit-cycles the cs should stay active after the transmission (0-16)
struct {
unsigned int dc_cmd_level: 1; // Indicates the level of DC line when transferring command
unsigned int dc_data_level: 1; // Indicates the level of DC line when transferring color data
unsigned int dc_param_level: 1; // Indicates the level of DC line when transferring parameters
unsigned int octal_mode: 1; // Indicates whether the transmitting is enabled with octal mode (8 data lines)
unsigned int quad_mode: 1; // Indicates whether the transmitting is enabled with quad mode (4 data lines)
} flags;
lcd_spi_trans_descriptor_t trans_pool[]; // Transaction pool
} esp_lcd_panel_io_spi_t;
esp_err_t esp_lcd_new_panel_io_spi(esp_lcd_spi_bus_handle_t bus, const esp_lcd_panel_io_spi_config_t *io_config, esp_lcd_panel_io_handle_t *ret_io)
{
#if CONFIG_LCD_ENABLE_DEBUG_LOG
esp_log_level_set(TAG, ESP_LOG_DEBUG);
#endif
esp_err_t ret = ESP_OK;
esp_lcd_panel_io_spi_t *spi_panel_io = NULL;
ESP_GOTO_ON_FALSE(bus && io_config && ret_io, ESP_ERR_INVALID_ARG, err, TAG, "invalid argument");
spi_panel_io = calloc(1, sizeof(esp_lcd_panel_io_spi_t) + sizeof(lcd_spi_trans_descriptor_t) * io_config->trans_queue_depth);
ESP_GOTO_ON_FALSE(spi_panel_io, ESP_ERR_NO_MEM, err, TAG, "no mem for spi panel io");
spi_device_interface_config_t devcfg = {
.flags = SPI_DEVICE_HALFDUPLEX |
(io_config->flags.lsb_first ? SPI_DEVICE_TXBIT_LSBFIRST : 0) |
(io_config->flags.sio_mode ? SPI_DEVICE_3WIRE : 0) |
(io_config->flags.cs_high_active ? SPI_DEVICE_POSITIVE_CS : 0),
.clock_speed_hz = io_config->pclk_hz,
.mode = io_config->spi_mode,
.spics_io_num = io_config->cs_gpio_num,
.queue_size = io_config->trans_queue_depth,
.pre_cb = lcd_spi_pre_trans_cb, // pre-transaction callback, mainly control DC gpio level
.post_cb = lcd_spi_post_trans_color_cb, // post-transaction, where we invoke user registered "on_color_trans_done()"
.cs_ena_pretrans = io_config->cs_ena_pretrans,
.cs_ena_posttrans = io_config->cs_ena_posttrans,
};
ret = spi_bus_add_device((spi_host_device_t)bus, &devcfg, &spi_panel_io->spi_dev);
ESP_GOTO_ON_ERROR(ret, err, TAG, "adding spi device to bus failed");
// if the DC line is not encoded into any spi transaction phase or it's not controlled by SPI peripheral
if (io_config->dc_gpio_num >= 0) {
gpio_config_t io_conf = {
.mode = GPIO_MODE_OUTPUT,
.pin_bit_mask = 1ULL << io_config->dc_gpio_num,
};
ESP_GOTO_ON_ERROR(gpio_config(&io_conf), err, TAG, "configure GPIO for D/C line failed");
}
spi_panel_io->flags.dc_cmd_level = io_config->flags.dc_high_on_cmd;
spi_panel_io->flags.dc_data_level = !io_config->flags.dc_low_on_data;
spi_panel_io->flags.dc_param_level = !io_config->flags.dc_low_on_param;
spi_panel_io->flags.octal_mode = io_config->flags.octal_mode;
spi_panel_io->flags.quad_mode = io_config->flags.quad_mode;
spi_panel_io->on_color_trans_done = io_config->on_color_trans_done;
spi_panel_io->user_ctx = io_config->user_ctx;
spi_panel_io->lcd_cmd_bits = io_config->lcd_cmd_bits;
spi_panel_io->lcd_param_bits = io_config->lcd_param_bits;
spi_panel_io->dc_gpio_num = io_config->dc_gpio_num;
spi_panel_io->queue_size = io_config->trans_queue_depth;
spi_panel_io->base.rx_param = panel_io_spi_rx_param;
spi_panel_io->base.tx_param = panel_io_spi_tx_param;
spi_panel_io->base.tx_color = panel_io_spi_tx_color;
spi_panel_io->base.del = panel_io_spi_del;
spi_panel_io->base.register_event_callbacks = panel_io_spi_register_event_callbacks;
size_t max_trans_bytes = 0;
ESP_GOTO_ON_ERROR(spi_bus_get_max_transaction_len((spi_host_device_t)bus, &max_trans_bytes), err, TAG, "get spi max transaction len failed");
spi_panel_io->spi_trans_max_bytes = max_trans_bytes;
*ret_io = &(spi_panel_io->base);
ESP_LOGD(TAG, "new spi lcd panel io @%p, max_trans_bytes: %d", spi_panel_io, (int)max_trans_bytes);
return ESP_OK;
err:
if (spi_panel_io) {
if (io_config->dc_gpio_num >= 0) {
gpio_reset_pin(io_config->dc_gpio_num);
}
free(spi_panel_io);
}
return ret;
}
static esp_err_t panel_io_spi_del(esp_lcd_panel_io_t *io)
{
esp_err_t ret = ESP_OK;
spi_transaction_t *spi_trans = NULL;
esp_lcd_panel_io_spi_t *spi_panel_io = __containerof(io, esp_lcd_panel_io_spi_t, base);
// wait all pending transaction to finish
size_t num_trans_inflight = spi_panel_io->num_trans_inflight;
for (size_t i = 0; i < num_trans_inflight; i++) {
ret = spi_device_get_trans_result(spi_panel_io->spi_dev, &spi_trans, portMAX_DELAY);
ESP_GOTO_ON_ERROR(ret, err, TAG, "recycle spi transactions failed");
spi_panel_io->num_trans_inflight--;
}
spi_bus_remove_device(spi_panel_io->spi_dev);
if (spi_panel_io->dc_gpio_num >= 0) {
gpio_reset_pin(spi_panel_io->dc_gpio_num);
}
ESP_LOGD(TAG, "del lcd panel io spi @%p", spi_panel_io);
free(spi_panel_io);
err:
return ret;
}
static esp_err_t panel_io_spi_register_event_callbacks(esp_lcd_panel_io_handle_t io, const esp_lcd_panel_io_callbacks_t *cbs, void *user_ctx)
{
esp_lcd_panel_io_spi_t *spi_panel_io = __containerof(io, esp_lcd_panel_io_spi_t, base);
if (spi_panel_io->on_color_trans_done != NULL) {
ESP_LOGW(TAG, "Callback on_color_trans_done was already set and now it was overwritten!");
}
spi_panel_io->on_color_trans_done = cbs->on_color_trans_done;
spi_panel_io->user_ctx = user_ctx;
return ESP_OK;
}
static void spi_lcd_prepare_cmd_buffer(esp_lcd_panel_io_spi_t *panel_io, const void *cmd)
{
uint8_t *from = (uint8_t *)cmd;
// LCD is big-endian, e.g. to send command 0x1234, byte 0x12 should appear on the bus first
// However, the SPI peripheral will send 0x34 first, so we reversed the order below
if (panel_io->lcd_cmd_bits > 8) {
int start = 0;
int end = panel_io->lcd_cmd_bits / 8 - 1;
lcd_com_reverse_buffer_bytes(from, start, end);
}
}
static void spi_lcd_prepare_param_buffer(esp_lcd_panel_io_spi_t *panel_io, const void *param, size_t param_size)
{
uint8_t *from = (uint8_t *)param;
int param_width = panel_io->lcd_param_bits / 8;
size_t param_num = param_size / param_width;
// LCD is big-endian, e.g. to send command 0x1234, byte 0x12 should appear on the bus first
// However, the SPI peripheral will send 0x34 first, so we reversed the order below
if (panel_io->lcd_param_bits > 8) {
for (size_t i = 0; i < param_num; i++) {
int start = i * param_width;
int end = start + param_width - 1;
lcd_com_reverse_buffer_bytes(from, start, end);
}
}
}
static esp_err_t panel_io_spi_tx_param(esp_lcd_panel_io_t *io, int lcd_cmd, const void *param, size_t param_size)
{
esp_err_t ret = ESP_OK;
spi_transaction_t *spi_trans = NULL;
lcd_spi_trans_descriptor_t *lcd_trans = NULL;
esp_lcd_panel_io_spi_t *spi_panel_io = __containerof(io, esp_lcd_panel_io_spi_t, base);
bool send_cmd = (lcd_cmd >= 0);
ESP_RETURN_ON_ERROR(spi_device_acquire_bus(spi_panel_io->spi_dev, portMAX_DELAY), TAG, "acquire spi bus failed");
// before issue a polling transaction, need to wait queued transactions finished
size_t num_trans_inflight = spi_panel_io->num_trans_inflight;
for (size_t i = 0; i < num_trans_inflight; i++) {
ret = spi_device_get_trans_result(spi_panel_io->spi_dev, &spi_trans, portMAX_DELAY);
ESP_GOTO_ON_ERROR(ret, err, TAG, "recycle spi transactions failed");
spi_panel_io->num_trans_inflight--;
}
lcd_trans = &spi_panel_io->trans_pool[0];
memset(lcd_trans, 0, sizeof(lcd_spi_trans_descriptor_t));
lcd_trans->base.user = spi_panel_io;
if (param && param_size) {
lcd_trans->base.flags |= SPI_TRANS_CS_KEEP_ACTIVE;
}
if (spi_panel_io->flags.octal_mode) {
// use 8 lines for transmitting command, address and data
lcd_trans->base.flags |= (SPI_TRANS_MULTILINE_CMD | SPI_TRANS_MULTILINE_ADDR | SPI_TRANS_MODE_OCT);
}
if (send_cmd) {
spi_lcd_prepare_cmd_buffer(spi_panel_io, &lcd_cmd);
lcd_trans->flags.dc_gpio_level = spi_panel_io->flags.dc_cmd_level; // set D/C level in command phase
lcd_trans->base.length = spi_panel_io->lcd_cmd_bits;
lcd_trans->base.tx_buffer = &lcd_cmd;
// command is short, using polling mode
ret = spi_device_polling_transmit(spi_panel_io->spi_dev, &lcd_trans->base);
ESP_GOTO_ON_ERROR(ret, err, TAG, "spi transmit (polling) command failed");
}
if (param && param_size) {
spi_lcd_prepare_param_buffer(spi_panel_io, param, param_size);
lcd_trans->flags.dc_gpio_level = spi_panel_io->flags.dc_param_level; // set D/C level in param phase
lcd_trans->base.length = param_size * 8; // transaction length is in bits
lcd_trans->base.tx_buffer = param;
lcd_trans->base.flags &= ~SPI_TRANS_CS_KEEP_ACTIVE;
// parameter is usually short, using polling mode
ret = spi_device_polling_transmit(spi_panel_io->spi_dev, &lcd_trans->base);
ESP_GOTO_ON_ERROR(ret, err, TAG, "spi transmit (polling) param failed");
}
err:
spi_device_release_bus(spi_panel_io->spi_dev);
return ret;
}
static esp_err_t panel_io_spi_rx_param(esp_lcd_panel_io_t *io, int lcd_cmd, void *param, size_t param_size)
{
esp_err_t ret = ESP_OK;
spi_transaction_t *spi_trans = NULL;
lcd_spi_trans_descriptor_t *lcd_trans = NULL;
esp_lcd_panel_io_spi_t *spi_panel_io = __containerof(io, esp_lcd_panel_io_spi_t, base);
bool send_cmd = (lcd_cmd >= 0);
ESP_RETURN_ON_ERROR(spi_device_acquire_bus(spi_panel_io->spi_dev, portMAX_DELAY), TAG, "acquire spi bus failed");
// before issue a polling transaction, need to wait queued transactions finished
size_t num_trans_inflight = spi_panel_io->num_trans_inflight;
for (size_t i = 0; i < num_trans_inflight; i++) {
ret = spi_device_get_trans_result(spi_panel_io->spi_dev, &spi_trans, portMAX_DELAY);
ESP_GOTO_ON_ERROR(ret, err, TAG, "recycle spi transactions failed");
spi_panel_io->num_trans_inflight--;
}
lcd_trans = &spi_panel_io->trans_pool[0];
memset(lcd_trans, 0, sizeof(lcd_spi_trans_descriptor_t));
lcd_trans->base.user = spi_panel_io;
lcd_trans->base.flags |= SPI_TRANS_CS_KEEP_ACTIVE;
if (spi_panel_io->flags.octal_mode) {
// use 8 lines for transmitting command, address and data
lcd_trans->base.flags |= (SPI_TRANS_MULTILINE_CMD | SPI_TRANS_MULTILINE_ADDR | SPI_TRANS_MODE_OCT);
}
if (send_cmd) {
spi_lcd_prepare_cmd_buffer(spi_panel_io, &lcd_cmd);
lcd_trans->flags.dc_gpio_level = spi_panel_io->flags.dc_cmd_level; // set D/C level in command phase
lcd_trans->base.length = spi_panel_io->lcd_cmd_bits;
lcd_trans->base.tx_buffer = &lcd_cmd;
// command is short, using polling mode
ret = spi_device_polling_transmit(spi_panel_io->spi_dev, &lcd_trans->base);
ESP_GOTO_ON_ERROR(ret, err, TAG, "spi transmit (polling) command failed");
}
if (param && param_size) {
lcd_trans->flags.dc_gpio_level = spi_panel_io->flags.dc_param_level; // set D/C level in param phase
lcd_trans->base.length = 0;
lcd_trans->base.tx_buffer = NULL;
lcd_trans->base.rxlength = param_size * 8; // Read length in bits
lcd_trans->base.rx_buffer = param;
lcd_trans->base.flags &= ~SPI_TRANS_CS_KEEP_ACTIVE;
// parameter is usually short, using polling mode
ret = spi_device_polling_transmit(spi_panel_io->spi_dev, &lcd_trans->base);
ESP_GOTO_ON_ERROR(ret, err, TAG, "spi transmit (polling) param failed");
}
err:
spi_device_release_bus(spi_panel_io->spi_dev);
return ret;
}
static esp_err_t panel_io_spi_tx_color(esp_lcd_panel_io_t *io, int lcd_cmd, const void *color, size_t color_size)
{
esp_err_t ret = ESP_OK;
spi_transaction_t *spi_trans = NULL;
lcd_spi_trans_descriptor_t *lcd_trans = NULL;
esp_lcd_panel_io_spi_t *spi_panel_io = __containerof(io, esp_lcd_panel_io_spi_t, base);
ESP_RETURN_ON_ERROR(spi_device_acquire_bus(spi_panel_io->spi_dev, portMAX_DELAY), TAG, "acquire spi bus failed");
bool send_cmd = (lcd_cmd >= 0);
if (send_cmd) {
// before issue a polling transaction, need to wait queued transactions finished
size_t num_trans_inflight = spi_panel_io->num_trans_inflight;
for (size_t i = 0; i < num_trans_inflight; i++) {
ret = spi_device_get_trans_result(spi_panel_io->spi_dev, &spi_trans, portMAX_DELAY);
ESP_GOTO_ON_ERROR(ret, err, TAG, "recycle spi transactions failed");
spi_panel_io->num_trans_inflight--;
}
lcd_trans = &spi_panel_io->trans_pool[0];
memset(lcd_trans, 0, sizeof(lcd_spi_trans_descriptor_t));
spi_lcd_prepare_cmd_buffer(spi_panel_io, &lcd_cmd);
lcd_trans->base.user = spi_panel_io;
lcd_trans->flags.dc_gpio_level = spi_panel_io->flags.dc_cmd_level; // set D/C level in command phase
lcd_trans->base.length = spi_panel_io->lcd_cmd_bits;
lcd_trans->base.tx_buffer = &lcd_cmd;
if (color && color_size) {
lcd_trans->base.flags |= SPI_TRANS_CS_KEEP_ACTIVE;
}
if (spi_panel_io->flags.octal_mode) {
// use 8 lines for transmitting command, address and data
lcd_trans->base.flags |= (SPI_TRANS_MULTILINE_CMD | SPI_TRANS_MULTILINE_ADDR | SPI_TRANS_MODE_OCT);
}
// command is short, using polling mode
ret = spi_device_polling_transmit(spi_panel_io->spi_dev, &lcd_trans->base);
ESP_GOTO_ON_ERROR(ret, err, TAG, "spi transmit (polling) command failed");
}
// if the color buffer is big, we want to split it into chunks, and queue the chunks one by one
do {
size_t chunk_size = color_size;
if (spi_panel_io->num_trans_inflight < spi_panel_io->queue_size) {
// get the next available transaction
lcd_trans = &spi_panel_io->trans_pool[spi_panel_io->num_trans_inflight];
} else {
// transaction pool has used up, recycle one transaction
ret = spi_device_get_trans_result(spi_panel_io->spi_dev, &spi_trans, portMAX_DELAY);
ESP_GOTO_ON_ERROR(ret, err, TAG, "recycle spi transactions failed");
lcd_trans = __containerof(spi_trans, lcd_spi_trans_descriptor_t, base);
spi_panel_io->num_trans_inflight--;
}
memset(lcd_trans, 0, sizeof(lcd_spi_trans_descriptor_t));
// SPI per-transfer size has its limitation, if the color buffer is too big, we need to split it into multiple chunks
if (chunk_size > spi_panel_io->spi_trans_max_bytes) {
// cap the transfer size to the maximum supported by the bus
chunk_size = spi_panel_io->spi_trans_max_bytes;
lcd_trans->base.flags |= SPI_TRANS_CS_KEEP_ACTIVE;
} else {
// mark en_trans_done_cb only at the last round to avoid premature completion callback
lcd_trans->flags.en_trans_done_cb = 1;
lcd_trans->base.flags &= ~SPI_TRANS_CS_KEEP_ACTIVE;
}
lcd_trans->base.user = spi_panel_io;
lcd_trans->flags.dc_gpio_level = spi_panel_io->flags.dc_data_level; // set D/C level in data phase
lcd_trans->base.length = chunk_size * 8; // transaction length is in bits
lcd_trans->base.tx_buffer = color;
if (spi_panel_io->flags.octal_mode) {
// use 8 lines for transmitting command, address and data
lcd_trans->base.flags |= (SPI_TRANS_MULTILINE_CMD | SPI_TRANS_MULTILINE_ADDR | SPI_TRANS_MODE_OCT);
} else if (spi_panel_io->flags.quad_mode) {
// use 4 lines only for transmitting data
lcd_trans->base.flags |= SPI_TRANS_MODE_QIO;
}
// color data is usually large, using queue+blocking mode
ret = spi_device_queue_trans(spi_panel_io->spi_dev, &lcd_trans->base, portMAX_DELAY);
ESP_GOTO_ON_ERROR(ret, err, TAG, "spi transmit (queue) color failed");
spi_panel_io->num_trans_inflight++;
// move on to the next chunk
color = (const uint8_t *)color + chunk_size;
color_size -= chunk_size;
} while (color_size > 0); // continue while we have remaining data to transmit
err:
spi_device_release_bus(spi_panel_io->spi_dev);
return ret;
}
IRAM_ATTR static void lcd_spi_pre_trans_cb(spi_transaction_t *trans)
{
esp_lcd_panel_io_spi_t *spi_panel_io = trans->user;
lcd_spi_trans_descriptor_t *lcd_trans = __containerof(trans, lcd_spi_trans_descriptor_t, base);
if (spi_panel_io->dc_gpio_num >= 0) { // set D/C line level if necessary
// use ll function to speed up
gpio_ll_set_level(&GPIO, spi_panel_io->dc_gpio_num, lcd_trans->flags.dc_gpio_level);
}
}
static void lcd_spi_post_trans_color_cb(spi_transaction_t *trans)
{
esp_lcd_panel_io_spi_t *spi_panel_io = trans->user;
lcd_spi_trans_descriptor_t *lcd_trans = __containerof(trans, lcd_spi_trans_descriptor_t, base);
if (lcd_trans->flags.en_trans_done_cb) {
if (spi_panel_io->on_color_trans_done) {
spi_panel_io->on_color_trans_done(&spi_panel_io->base, NULL, spi_panel_io->user_ctx);
}
}
}
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