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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_sh1122.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(sh1122, 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/i2c.h>
#include <zephyr/drivers/mipi_dbi.h>
#include <zephyr/kernel.h>
#define SH1122_CONTROL_ALL_BYTES_CMD 0x0
#define SH1122_CONTROL_ALL_BYTES_DATA 0x40
#define SH1122_SET_PHASE_LENGTH 0xD9
#define SH1122_SET_OSC_FREQ 0xD5
#define SH1122_SET_VCOMH 0xDB
#define SH1122_SET_DCDC 0xAD
#define SH1122_SET_DISPLAY_OFFSET 0xD3
#define SH1122_DISPLAY_ON 0xAF
#define SH1122_DISPLAY_OFF 0xAE
#define SH1122_SET_MULTIPLEX_RATIO 0xA8
#define SH1122_SET_SEG_ORDER_10 0xA0
#define SH1122_SET_SEG_ORDER_01 0xA1
#define SH1122_SET_COM_ORDER_10 0xC0
#define SH1122_SET_COM_ORDER_01 0xC8
#define SH1122_SET_CONTRAST_CTRL 0x81
#define SH1122_SET_VSEGM 0xDC
#define SH1122_SET_DISPLAY_RAM 0xA4
#define SH1122_SET_DISPLAY_ALL_ON 0xA5
#define SH1122_SET_NORMAL_DISPLAY 0xA6
#define SH1122_SET_REVERSE_DISPLAY 0xA7
#define SH1122_SET_ROW_ADDR 0xB0
#define SH1122_SET_COLUMN_ADDR_HIGH(n) (0x10 + ((n) >> 4))
#define SH1122_SET_COLUMN_ADDR_LOW(n) (0x0 + ((n) & 0xf))
#define SH1122_SET_DISPLAY_START_LINE(n) (0x40 + ((n) & 0x3f))
#define SH1122_SET_VSL(n) (0x30 + ((n) & 0xf))
#define SH1122_RESET_DELAY 10
#define SH1122_MAXIMUM_CMD_LENGTH 16
/* One line since we need to return to column every partial line */
#define SH1122_CONV_BUFFER_SIZE 128
typedef int (*sh1122_write_bus_cmd_fn)(const struct device *dev, const uint8_t cmd,
const uint8_t *data, size_t len);
typedef int (*sh1122_write_pixels_fn)(const struct device *dev, const uint8_t *buf,
const struct display_buffer_descriptor *desc);
typedef int (*sh1122_release_bus_fn)(const struct device *dev);
struct sh1122_config {
struct i2c_dt_spec i2c;
sh1122_write_bus_cmd_fn write_cmd;
sh1122_write_pixels_fn write_pixels;
sh1122_release_bus_fn release_bus;
const struct device *mipi_dev;
const struct mipi_dbi_config dbi_config;
uint16_t height;
uint16_t width;
uint8_t oscillator_freq;
uint8_t start_line;
uint8_t display_offset;
uint8_t multiplex_ratio;
uint8_t dc_dc;
uint8_t remap_value;
uint8_t phase_length;
uint8_t precharge_voltage;
uint8_t vcomh_voltage;
uint8_t low_voltage;
bool color_inversion;
bool inv_seg;
bool inv_com;
uint8_t *conversion_buf;
size_t conversion_buf_size;
};
struct sh1122_data {
uint8_t contrast;
uint8_t scan_mode;
};
static inline int sh1122_write_bus_cmd_mipi(const struct device *dev, const uint8_t cmd,
const uint8_t *data, size_t len)
{
const struct sh1122_config *config = dev->config;
int err;
/* Values given after the memory register must be sent with pin D/C set to 0. */
/* Data is sent as a command following the mipi_cbi api */
err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config, cmd, NULL, 0);
if (err) {
return err;
}
for (size_t i = 0; i < len; i++) {
err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config, data[i], NULL,
0);
if (err) {
return err;
}
}
return 0;
}
static inline int sh1122_write_bus_cmd_i2c(const struct device *dev, const uint8_t cmd,
const uint8_t *data, size_t len)
{
const struct sh1122_config *config = dev->config;
static uint8_t buf[SH1122_MAXIMUM_CMD_LENGTH];
if (len > SH1122_MAXIMUM_CMD_LENGTH - 1) {
return -EINVAL;
}
buf[0] = cmd;
memcpy(&(buf[1]), data, len);
return i2c_burst_write_dt(&config->i2c, SH1122_CONTROL_ALL_BYTES_CMD, buf, len + 1);
}
static inline int sh1122_set_hardware_config(const struct device *dev)
{
const struct sh1122_config *config = dev->config;
int err;
err = config->write_cmd(dev, SH1122_SET_DISPLAY_START_LINE(config->start_line), NULL, 0);
if (err < 0) {
return err;
}
err = config->write_cmd(dev, SH1122_SET_DISPLAY_OFFSET, &config->display_offset, 1);
if (err < 0) {
return err;
}
err = config->write_cmd(dev, SH1122_SET_DISPLAY_RAM, NULL, 0);
if (err < 0) {
return err;
}
err = config->write_cmd(dev, SH1122_SET_NORMAL_DISPLAY, NULL, 0);
if (err < 0) {
return err;
}
err = config->write_cmd(
dev, config->inv_com ? SH1122_SET_COM_ORDER_01 : SH1122_SET_COM_ORDER_10, NULL, 0);
if (err < 0) {
return err;
}
err = config->write_cmd(
dev, config->inv_seg ? SH1122_SET_SEG_ORDER_01 : SH1122_SET_SEG_ORDER_10, NULL, 0);
if (err < 0) {
return err;
}
err = config->write_cmd(dev, SH1122_SET_VSL(config->low_voltage), NULL, 0);
if (err < 0) {
return err;
}
err = config->write_cmd(dev, SH1122_SET_MULTIPLEX_RATIO, &config->multiplex_ratio, 1);
if (err < 0) {
return err;
}
err = config->write_cmd(dev, SH1122_SET_PHASE_LENGTH, &config->phase_length, 1);
if (err < 0) {
return err;
}
err = config->write_cmd(dev, SH1122_SET_OSC_FREQ, &config->oscillator_freq, 1);
if (err < 0) {
return err;
}
err = config->write_cmd(dev, SH1122_SET_VSEGM, &config->precharge_voltage, 1);
if (err < 0) {
return err;
}
err = config->write_cmd(dev, SH1122_SET_VCOMH, &config->vcomh_voltage, 1);
if (err < 0) {
return err;
}
return config->write_cmd(dev, SH1122_SET_DCDC, &config->dc_dc, 1);
}
static int sh1122_resume(const struct device *dev)
{
const struct sh1122_config *config = dev->config;
int err;
err = config->write_cmd(dev, SH1122_DISPLAY_ON, NULL, 0);
if (err < 0) {
return err;
}
return config->release_bus(dev);
}
static int sh1122_suspend(const struct device *dev)
{
const struct sh1122_config *config = dev->config;
int err;
err = config->write_cmd(dev, SH1122_DISPLAY_OFF, NULL, 0);
if (err < 0) {
return err;
}
return config->release_bus(dev);
}
#if DT_HAS_COMPAT_ON_BUS_STATUS_OKAY(sinowealth_sh1122, mipi_dbi)
static int sh1122_write_pixels_mipi(const struct device *dev, const uint8_t *buf,
const struct display_buffer_descriptor *desc)
{
const struct sh1122_config *config = dev->config;
struct display_buffer_descriptor mipi_desc;
mipi_desc.buf_size = desc->width / 2;
mipi_desc.pitch = desc->pitch;
mipi_desc.width = desc->width;
mipi_desc.height = 1;
/* This is the wrong format, but it doesn't matter to almost all mipi drivers */
return mipi_dbi_write_display(config->mipi_dev, &config->dbi_config, config->conversion_buf,
&mipi_desc, PIXEL_FORMAT_L_8);
}
static int sh1122_release_bus_mipi(const struct device *dev)
{
const struct sh1122_config *config = dev->config;
return mipi_dbi_release(config->mipi_dev, &config->dbi_config);
}
#endif
#if DT_HAS_COMPAT_ON_BUS_STATUS_OKAY(sinowealth_sh1122, i2c)
static int sh1122_write_pixels_i2c(const struct device *dev, const uint8_t *buf,
const struct display_buffer_descriptor *desc)
{
const struct sh1122_config *config = dev->config;
return i2c_burst_write_dt(&config->i2c, SH1122_CONTROL_ALL_BYTES_DATA,
config->conversion_buf, desc->width / 2);
}
static int sh1122_release_bus_i2c(const struct device *dev)
{
return 0;
}
#endif
static int sh1122_write(const struct device *dev, const uint16_t x, const uint16_t y,
const struct display_buffer_descriptor *desc, const void *buf)
{
const struct sh1122_config *config = dev->config;
int err;
size_t buf_len;
int pixel_count = desc->width * desc->height;
int total = 0;
uint8_t ybuf = y;
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;
}
if ((x & 1) != 0U) {
LOG_ERR("Unsupported origin");
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);
while (pixel_count > total) {
err = config->write_cmd(dev, SH1122_SET_COLUMN_ADDR_HIGH(x / 2), NULL, 0);
if (err) {
return err;
}
err = config->write_cmd(dev, SH1122_SET_COLUMN_ADDR_LOW(x / 2), NULL, 0);
if (err) {
return err;
}
err = config->write_cmd(dev, SH1122_SET_ROW_ADDR, &ybuf, 1);
if (err) {
return err;
}
/* Convert one line to pixelx+1 (3:0) and pixelx (7:4)
* SH1122 is 2 pixels per byte.
*/
for (int i = 0; desc->width > i; i += 2) {
config->conversion_buf[i / 2] = (((uint8_t *)buf)[total + i + 1] >> 4) |
((((uint8_t *)buf)[total + i] >> 4) << 4);
}
err = config->write_pixels(dev, config->conversion_buf, desc);
if (err) {
return err;
}
total += desc->width;
ybuf++;
}
return config->release_bus(dev);
}
static int sh1122_set_contrast(const struct device *dev, const uint8_t contrast)
{
const struct sh1122_config *config = dev->config;
int err;
err = config->write_cmd(dev, SH1122_SET_CONTRAST_CTRL, &contrast, 1);
if (err < 0) {
return err;
}
return config->release_bus(dev);
}
static void sh1122_get_capabilities(const struct device *dev, struct display_capabilities *caps)
{
const struct sh1122_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_L_8;
caps->current_pixel_format = PIXEL_FORMAT_L_8;
caps->screen_info = 0;
}
static int sh1122_set_pixel_format(const struct device *dev, const enum display_pixel_format pf)
{
if (pf == PIXEL_FORMAT_L_8) {
return 0;
}
LOG_ERR("Unsupported pixel format");
return -ENOTSUP;
}
static int sh1122_init_device(const struct device *dev)
{
const struct sh1122_config *config = dev->config;
int err;
/* Turn display off */
err = sh1122_suspend(dev);
if (err < 0) {
return err;
}
err = sh1122_set_contrast(dev, CONFIG_SH1122_DEFAULT_CONTRAST);
if (err < 0) {
return err;
}
err = sh1122_set_hardware_config(dev);
if (err < 0) {
return err;
}
err = config->write_cmd(dev,
config->color_inversion ? SH1122_SET_REVERSE_DISPLAY
: SH1122_SET_NORMAL_DISPLAY,
NULL, 0);
if (err < 0) {
return err;
}
err = sh1122_resume(dev);
if (err < 0) {
return err;
}
return config->release_bus(dev);
}
#if DT_HAS_COMPAT_ON_BUS_STATUS_OKAY(sinowealth_sh1122, mipi_dbi)
static int sh1122_init(const struct device *dev)
{
const struct sh1122_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, SH1122_RESET_DELAY);
if (err < 0) {
LOG_ERR("Failed to reset device!");
return err;
}
k_msleep(SH1122_RESET_DELAY);
err = sh1122_init_device(dev);
if (err < 0) {
LOG_ERR("Failed to initialize device! %d", err);
return err;
}
return 0;
}
#endif
#if DT_HAS_COMPAT_ON_BUS_STATUS_OKAY(sinowealth_sh1122, i2c)
static int sh1122_init_i2c(const struct device *dev)
{
const struct sh1122_config *config = dev->config;
int err;
LOG_DBG("Initializing device");
if (!i2c_is_ready_dt(&config->i2c)) {
LOG_ERR("I2C Device not ready!");
return -EINVAL;
}
err = sh1122_init_device(dev);
if (err < 0) {
LOG_ERR("Failed to initialize device! %d", err);
return err;
}
return 0;
}
#endif
static DEVICE_API(display, sh1122_driver_api) = {
.blanking_on = sh1122_suspend,
.blanking_off = sh1122_resume,
.write = sh1122_write,
.set_contrast = sh1122_set_contrast,
.get_capabilities = sh1122_get_capabilities,
.set_pixel_format = sh1122_set_pixel_format,
};
#define SH1122_WORD_SIZE(inst) \
((DT_STRING_UPPER_TOKEN(inst, mipi_mode) == MIPI_DBI_MODE_SPI_4WIRE) ? SPI_WORD_SET(8) \
: SPI_WORD_SET(9))
#define SH1122_DEFINE_I2C(node_id) \
static uint8_t conversion_buf##node_id[SH1122_CONV_BUFFER_SIZE]; \
static struct sh1122_data data##node_id; \
static const struct sh1122_config config##node_id = { \
.i2c = I2C_DT_SPEC_GET(node_id), \
.height = DT_PROP(node_id, height), \
.width = DT_PROP(node_id, width), \
.oscillator_freq = DT_PROP(node_id, oscillator_freq), \
.display_offset = DT_PROP(node_id, display_offset), \
.start_line = DT_PROP(node_id, start_line), \
.multiplex_ratio = DT_PROP(node_id, multiplex_ratio), \
.color_inversion = DT_PROP(node_id, inversion_on), \
.phase_length = DT_PROP(node_id, phase_length), \
.dc_dc = DT_PROP(node_id, dc_dc), \
.precharge_voltage = DT_PROP(node_id, precharge_voltage), \
.vcomh_voltage = DT_PROP(node_id, vcomh_voltage), \
.low_voltage = DT_PROP(node_id, low_voltage), \
.inv_seg = DT_PROP(node_id, inv_seg), \
.inv_com = DT_PROP(node_id, inv_com), \
.write_cmd = sh1122_write_bus_cmd_i2c, \
.write_pixels = sh1122_write_pixels_i2c, \
.release_bus = sh1122_release_bus_i2c, \
.conversion_buf = conversion_buf##node_id, \
}; \
\
DEVICE_DT_DEFINE(node_id, sh1122_init_i2c, NULL, &data##node_id, &config##node_id, \
POST_KERNEL, CONFIG_DISPLAY_INIT_PRIORITY, &sh1122_driver_api);
#define SH1122_DEFINE_MIPI(node_id) \
static uint8_t conversion_buf##node_id[SH1122_CONV_BUFFER_SIZE]; \
static struct sh1122_data data##node_id; \
static const struct sh1122_config config##node_id = { \
.mipi_dev = DEVICE_DT_GET(DT_PARENT(node_id)), \
.dbi_config = MIPI_DBI_CONFIG_DT( \
node_id, SH1122_WORD_SIZE(node_id) | SPI_OP_MODE_MASTER, 0), \
.height = DT_PROP(node_id, height), \
.width = DT_PROP(node_id, width), \
.oscillator_freq = DT_PROP(node_id, oscillator_freq), \
.display_offset = DT_PROP(node_id, display_offset), \
.start_line = DT_PROP(node_id, start_line), \
.multiplex_ratio = DT_PROP(node_id, multiplex_ratio), \
.color_inversion = DT_PROP(node_id, inversion_on), \
.phase_length = DT_PROP(node_id, phase_length), \
.dc_dc = DT_PROP(node_id, dc_dc), \
.precharge_voltage = DT_PROP(node_id, precharge_voltage), \
.vcomh_voltage = DT_PROP(node_id, vcomh_voltage), \
.low_voltage = DT_PROP(node_id, low_voltage), \
.inv_seg = DT_PROP(node_id, inv_seg), \
.inv_com = DT_PROP(node_id, inv_com), \
.write_cmd = sh1122_write_bus_cmd_mipi, \
.write_pixels = sh1122_write_pixels_mipi, \
.release_bus = sh1122_release_bus_mipi, \
.conversion_buf = conversion_buf##node_id, \
}; \
\
DEVICE_DT_DEFINE(node_id, sh1122_init, NULL, &data##node_id, &config##node_id, \
POST_KERNEL, CONFIG_DISPLAY_INIT_PRIORITY, &sh1122_driver_api);
#define SH1122_DEFINE(node_id) \
COND_CODE_1(DT_ON_BUS(node_id, i2c), \
(SH1122_DEFINE_I2C(node_id)), (SH1122_DEFINE_MIPI(node_id)))
DT_FOREACH_STATUS_OKAY(sinowealth_sh1122, SH1122_DEFINE)