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Primary Git Repository for the Zephyr Project. Zephyr is a new generation, scalable, optimized, secure RTOS for multiple hardware architectures.
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zephyr/drivers/display/display_ssd1351.c

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/*
* Copyright (c) 2025 MASSDRIVER EI (massdriver.space)
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(ssd1351, CONFIG_DISPLAY_LOG_LEVEL);
#include <string.h>
#include <zephyr/device.h>
#include <zephyr/init.h>
#include <zephyr/drivers/display.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/drivers/mipi_dbi.h>
#include <zephyr/kernel.h>
#define SSD1351_DISPLAY_OFF 0xAE
#define SSD1351_DISPLAY_ON 0xAF
#define SSD1351_SET_NORMAL_DISPLAY 0xA6
#define SSD1351_SET_REVERSE_DISPLAY 0xA7
#define SSD1351_SET_COLUMN_ADDR 0x15
#define SSD1351_SET_ROW_ADDR 0x75
#define SSD1351_SET_DISPLAY_START_LINE 0xA1
#define SSD1351_SET_DISPLAY_OFFSET 0xA2
#define SSD1351_SET_MULTIPLEX_RATIO 0xCA
#define SSD1351_SET_PHASE_LENGTH 0xB1
#define SSD1351_SET_OSC_FREQ 0xB3
#define SSD1351_SET_PRECHARGE_V 0xBB
#define SSD1351_SET_VCOMH 0xBE
#define SSD1351_SET_CURRENT_ATT 0xC7
#define SSD1351_SET_PRECHARGE_P 0xB6
#define SSD1351_SET_REMAP 0xA0
#define SSD1351_STOP_SCROLL 0x9E
#define SSD1351_SET_LINEAR_LUT 0xB9
#define SSD1351_CONTRAST 0xC1
#define SSD1351_SET_LOCK 0xFD
#define SSD1351_UNLOCK_1 0x12
#define SSD1351_UNLOCK_2 0xB1
#define SSD1351_LOCK_1 0x16
#define SSD1351_LOCK_2 0xB0
#define SSD1351_WRITE 0x5C
#define SSD1351_RESET_DELAY 10
struct ssd1351_config {
const struct device *mipi_dev;
const struct mipi_dbi_config dbi_config;
uint16_t height;
uint16_t width;
uint8_t start_line;
uint8_t display_offset;
uint8_t multiplex_ratio;
uint8_t phase_length;
uint8_t oscillator_freq;
uint8_t precharge_voltage;
uint8_t precharge_time;
uint8_t vcomh_voltage;
uint8_t current_att;
uint8_t remap_value;
bool color_inversion;
};
static inline int ssd1351_set_hardware_config(const struct device *dev)
{
const struct ssd1351_config *config = dev->config;
int err;
uint8_t tmp;
tmp = SSD1351_UNLOCK_1;
err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config, SSD1351_SET_LOCK, &tmp,
1);
if (err < 0) {
return err;
}
tmp = SSD1351_UNLOCK_2;
err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config, SSD1351_SET_LOCK, &tmp,
1);
if (err < 0) {
return err;
}
err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config, SSD1351_SET_OSC_FREQ,
&config->oscillator_freq, 1);
if (err < 0) {
return err;
}
err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config,
SSD1351_SET_MULTIPLEX_RATIO, &config->multiplex_ratio, 1);
if (err < 0) {
return err;
}
err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config,
SSD1351_SET_DISPLAY_OFFSET, &config->display_offset, 1);
if (err < 0) {
return err;
}
err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config, SSD1351_SET_REMAP,
&config->remap_value, 1);
if (err < 0) {
return err;
}
err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config,
SSD1351_SET_DISPLAY_START_LINE, &config->start_line, 1);
if (err < 0) {
return err;
}
err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config,
SSD1351_SET_PHASE_LENGTH, &config->phase_length, 1);
if (err < 0) {
return err;
}
err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config, SSD1351_SET_VCOMH,
&config->vcomh_voltage, 1);
if (err < 0) {
return err;
}
err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config, SSD1351_SET_CURRENT_ATT,
&config->current_att, 1);
if (err < 0) {
return err;
}
err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config, SSD1351_SET_PRECHARGE_V,
&config->precharge_voltage, 1);
if (err < 0) {
return err;
}
err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config, SSD1351_SET_PRECHARGE_P,
&config->precharge_time, 1);
if (err < 0) {
return err;
}
return mipi_dbi_command_write(config->mipi_dev, &config->dbi_config, SSD1351_STOP_SCROLL,
NULL, 0);
}
static int ssd1351_resume(const struct device *dev)
{
const struct ssd1351_config *config = dev->config;
int err;
err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config, SSD1351_DISPLAY_ON,
NULL, 0);
if (err < 0) {
return err;
}
return mipi_dbi_release(config->mipi_dev, &config->dbi_config);
}
static int ssd1351_suspend(const struct device *dev)
{
const struct ssd1351_config *config = dev->config;
int err;
err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config, SSD1351_DISPLAY_OFF,
NULL, 0);
if (err < 0) {
return err;
}
return mipi_dbi_release(config->mipi_dev, &config->dbi_config);
}
static int ssd1351_write(const struct device *dev, const uint16_t x, const uint16_t y,
const struct display_buffer_descriptor *desc, const void *buf)
{
const struct ssd1351_config *config = dev->config;
int err;
size_t buf_len;
struct display_buffer_descriptor mipi_desc = *desc;
uint8_t x_position[] = {x, x + desc->width - 1};
uint8_t y_position[] = {y, y + desc->height - 1};
if (desc->pitch != desc->width) {
LOG_ERR("Pitch is not width");
return -EINVAL;
}
/* Following the datasheet, two segment are split in one register */
buf_len = MIN(desc->buf_size, desc->height * desc->width * 2);
if (buf == NULL || buf_len == 0U) {
LOG_ERR("Display buffer is not available");
return -EINVAL;
}
LOG_DBG("x %u, y %u, pitch %u, width %u, height %u, buf_len %u", x, y, desc->pitch,
desc->width, desc->height, buf_len);
err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config, SSD1351_SET_COLUMN_ADDR,
x_position, 2);
if (err < 0) {
return err;
}
err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config, SSD1351_SET_ROW_ADDR,
y_position, 2);
if (err < 0) {
return err;
}
err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config, SSD1351_WRITE, NULL, 0);
if (err < 0) {
return err;
}
err = mipi_dbi_write_display(config->mipi_dev, &config->dbi_config, buf, &mipi_desc,
PIXEL_FORMAT_RGB_565);
if (err < 0) {
return err;
}
return mipi_dbi_release(config->mipi_dev, &config->dbi_config);
}
static int ssd1351_set_contrast(const struct device *dev, const uint8_t contrast)
{
const struct ssd1351_config *config = dev->config;
uint8_t tmp[3];
tmp[0] = (contrast * CONFIG_SSD1351_CONTRASTA) / 0xFF;
tmp[1] = (contrast * CONFIG_SSD1351_CONTRASTB) / 0xFF;
tmp[2] = (contrast * CONFIG_SSD1351_CONTRASTC) / 0xFF;
return mipi_dbi_command_write(config->mipi_dev, &config->dbi_config, SSD1351_CONTRAST, tmp,
3);
}
static void ssd1351_get_capabilities(const struct device *dev, struct display_capabilities *caps)
{
const struct ssd1351_config *config = dev->config;
memset(caps, 0, sizeof(struct display_capabilities));
caps->x_resolution = config->width;
caps->y_resolution = config->height;
caps->supported_pixel_formats = PIXEL_FORMAT_RGB_565;
caps->current_pixel_format = PIXEL_FORMAT_RGB_565;
caps->screen_info = 0;
}
static int ssd1351_set_pixel_format(const struct device *dev, const enum display_pixel_format pf)
{
if (pf == PIXEL_FORMAT_RGB_565) {
return 0;
}
LOG_ERR("Unsupported pixel format");
return -ENOTSUP;
}
static int ssd1351_init_device(const struct device *dev)
{
const struct ssd1351_config *config = dev->config;
int err;
/* Turn display off */
err = ssd1351_suspend(dev);
if (err < 0) {
return err;
}
err = ssd1351_set_hardware_config(dev);
if (err < 0) {
return err;
}
err = ssd1351_set_contrast(dev, CONFIG_SSD1351_DEFAULT_CONTRAST);
if (err < 0) {
return err;
}
err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config,
config->color_inversion ? SSD1351_SET_REVERSE_DISPLAY
: SSD1351_SET_NORMAL_DISPLAY,
NULL, 0);
if (err < 0) {
return err;
}
err = ssd1351_resume(dev);
if (err < 0) {
return err;
}
return mipi_dbi_release(config->mipi_dev, &config->dbi_config);
}
static int ssd1351_init(const struct device *dev)
{
const struct ssd1351_config *config = dev->config;
int err;
LOG_DBG("Initializing device");
if (!device_is_ready(config->mipi_dev)) {
LOG_ERR("MIPI Device not ready!");
return -EINVAL;
}
err = mipi_dbi_reset(config->mipi_dev, SSD1351_RESET_DELAY);
if (err < 0) {
LOG_ERR("Failed to reset device!");
return err;
}
err = ssd1351_init_device(dev);
if (err < 0) {
LOG_ERR("Failed to initialize device! %d", err);
return err;
}
return 0;
}
static DEVICE_API(display, ssd1351_driver_api) = {
.blanking_on = ssd1351_suspend,
.blanking_off = ssd1351_resume,
.write = ssd1351_write,
.set_contrast = ssd1351_set_contrast,
.get_capabilities = ssd1351_get_capabilities,
.set_pixel_format = ssd1351_set_pixel_format,
};
#define SSD1351_WORD_SIZE(inst) \
((DT_STRING_UPPER_TOKEN(inst, mipi_mode) == MIPI_DBI_MODE_SPI_4WIRE) ? SPI_WORD_SET(8) \
: SPI_WORD_SET(9))
#define SSD1351_DEFINE_MIPI(node_id) \
static const struct ssd1351_config config##node_id = { \
.mipi_dev = DEVICE_DT_GET(DT_PARENT(node_id)), \
.dbi_config = MIPI_DBI_CONFIG_DT( \
node_id, SSD1351_WORD_SIZE(node_id) | SPI_OP_MODE_MASTER, 0), \
.height = DT_PROP(node_id, height), \
.width = DT_PROP(node_id, width), \
.display_offset = DT_PROP(node_id, display_offset), \
.start_line = DT_PROP(node_id, start_line), \
.multiplex_ratio = DT_PROP(node_id, multiplex_ratio), \
.phase_length = DT_PROP(node_id, phase_length), \
.oscillator_freq = DT_PROP(node_id, oscillator_freq), \
.precharge_time = DT_PROP(node_id, precharge_time), \
.precharge_voltage = DT_PROP(node_id, precharge_voltage), \
.vcomh_voltage = DT_PROP(node_id, vcomh_voltage), \
.current_att = DT_PROP(node_id, current_att), \
.color_inversion = DT_PROP(node_id, inversion_on), \
.remap_value = DT_PROP(node_id, remap_value), \
}; \
\
DEVICE_DT_DEFINE(node_id, ssd1351_init, NULL, NULL, &config##node_id, \
POST_KERNEL, CONFIG_DISPLAY_INIT_PRIORITY, &ssd1351_driver_api);
DT_FOREACH_STATUS_OKAY(solomon_ssd1351, SSD1351_DEFINE_MIPI)