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spi/i2c ver

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This commit is contained in:
Drath Vader
2026-08-21 00:00:10 +02:00
parent 073bcd0d25
commit df7d135577
6 changed files with 227 additions and 270 deletions
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32
README.md
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@@ -8,7 +8,7 @@ For both SPI and I2C displays
I2C version
```c
#include <st7567/st7567-i2c.h>
#include <st7567/st7567.h>
i2c_master_bus_config_t bus_cfg = {
.i2c_port = I2C_NUM_0,
@@ -21,15 +21,15 @@ i2c_master_bus_config_t bus_cfg = {
i2c_master_bus_handle_t bus;
i2c_new_master_bus(&bus_cfg, &bus);
st7567_config_t cfg = {
st7567_config_i2c_t cfg = {
.i2c_bus = bus,
.i2c_addr = ST7567_I2C_ADDR_DEFAULT, // 0x3F,
.i2c_clock_speed_hz = 400000,
.contrast = 0x38, // good for generic modules at 3.3v
};
st7567_device_t dev;
st7567_init(&cfg, &dev);
st7567_set_backlight(&dev, true);
st7567_init_i2c(&cfg, &dev);
st7567_draw_pixel(&dev, 10, 10);
st7567_update_screen(&dev);
@@ -38,11 +38,29 @@ st7567_update_screen(&dev);
SPI version
```c
#include <st7567/st7567-spi.h>
#include <st7567/st7567.h>
const spi_bus_config_t buscfg = {
.mosi_io_num = GPIO_NUM_18,
.sclk_io_num = GPIO_NUM_19,
.miso_io_num = GPIO_NUM_20, // default c6 spi pins?
.max_transfer_sz = 0,
.quadhd_io_num = -1,
.quadwp_io_num = -1,
};
spi_bus_initialize(SPI2_HOST, &buscfg, SPI_DMA_CH_AUTO);
const st7567_config_spi_t cfg = {
.contrast = 0x35,
.cs_gpio = GPIO_NUM_16,
.dc_gpio = GPIO_NUM_17,
.rst_gpio = GPIO_NUM_21,
.spi_clock_speed_hz = 0,
.spi_host = SPI2_HOST,
};
st7567_device_t dev;
st7567_init(&cfg, &dev);
st7567_set_backlight(&dev, true);
st7567_init_spi(&cfg, &dev);
st7567_draw_pixel(&dev, 10, 10);
st7567_update_screen(&dev);

2
idf_component.yml
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@@ -1,4 +1,4 @@
version: "1.1.1"
version: "2.0.0"
description: "ST7567 128x64 display driver"
url: "https://git.drath.cc/drath/esp-st7567"
dependencies:

31
st7567/st7567-i2c.h
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@@ -1,31 +0,0 @@
#ifndef ST7567_I2C_H
#define ST7567_I2C_H
#include "esp_err.h"
#include "driver/i2c_master.h"
#include "st7567-common.h"
// Display dimensions
#define ST7567_WIDTH 128
#define ST7567_HEIGHT 64
#define ST7567_PAGES (ST7567_HEIGHT / 8)
// Configuration structure
typedef struct {
i2c_master_bus_handle_t i2c_bus; // already-initialized I2C bus
uint16_t i2c_addr; // 7-bit device address, 0 = use ST7567_I2C_ADDR_DEFAULT
uint32_t i2c_clock_speed_hz; // 0 = use 400kHz default
uint8_t contrast; // 0-63, 0 = use a sane default (0x20)
} st7567_i2c_config_t;
/**
* @brief Initialize ST7567 display
*
* @param config Configuration structure
* @param device Pointer to store device state (framebuffer etc, caller-owned)
* @return esp_err_t ESP_OK on success
*/
esp_err_t st7567_init(const st7567_i2c_config_t *config, st7567_device_t *device);
#endif // ST7567_I2C_H

29
st7567/st7567-spi.h
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@@ -1,29 +0,0 @@
#ifndef ST7567_SPI_H
#define ST7567_SPI_H
#include "st7567-common.h"
#include "esp_err.h"
#include "driver/spi_master.h"
#include "driver/gpio.h"
// Configuration structure
typedef struct {
spi_host_device_t spi_host; // already-initialized SPI bus (spi_bus_initialize called by caller)
gpio_num_t cs_gpio; // chip select
gpio_num_t dc_gpio; // data/command select (required, no in-band control byte over SPI)
gpio_num_t rst_gpio; // hardware reset, GPIO_NUM_NC if not wired
uint32_t spi_clock_speed_hz; // 0 = use 8MHz default
uint8_t contrast; // 0-63, 0 = use a sane default (0x20)
} st7567_spi_config_t;
/**
* @brief Initialize ST7567 display
*
* @param config Configuration structure
* @param device Pointer to store device state (framebuffer etc, caller-owned)
* @return esp_err_t ESP_OK on success
*/
esp_err_t st7567_init(const st7567_spi_config_t *config, st7567_device_t *device);
#endif // ST7567_SPI_H

225
st7567/st7567.c
View File

@@ -1,20 +1,14 @@
#include "st7567-common.h"
#include "st7567.h"
#include <string.h>
#include "esp_log.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include <driver/i2c_master.h>
static const char *TAG = "ST7567";
#ifdef ST7567_I2C_H
#define ST7567_I2C_CTRL_CMD 0x00
#define ST7567_I2C_CTRL_DATA 0x40
#define ST7567_I2C_TIMEOUT_MS 100
#define ST7567_DEFAULT_I2C_CLOCK_HZ 400000
static esp_err_t st7567_write(const st7567_device_t *dev, uint8_t ctrl, const uint8_t *data, size_t len) {
static esp_err_t st7567_write_i2c(const st7567_device_t *dev, uint8_t ctrl, const uint8_t *data, size_t len) {
// small stack buffer, framebuffer flush is chunked by page (128B) so this is plenty
uint8_t buf[ST7567_WIDTH + 1];
if (len + 1 > sizeof(buf))
@@ -25,64 +19,7 @@ static esp_err_t st7567_write(const st7567_device_t *dev, uint8_t ctrl, const ui
return i2c_master_transmit(dev->bus, buf, len + 1, ST7567_I2C_TIMEOUT_MS);
}
esp_err_t st7567_send_cmd(const st7567_device_t *dev, const uint8_t cmd) {
return st7567_write(dev, ST7567_I2C_CTRL_CMD, &cmd, 1);
}
esp_err_t st7567_send_data(const st7567_device_t *dev, const uint8_t *data, size_t len) {
return st7567_write(dev, ST7567_I2C_CTRL_DATA, data, len);
}
esp_err_t st7567_init(const st7567_i2c_config_t *config, st7567_device_t *device) {
memset(device, 0, sizeof(st7567_device_t)); // clears framebuffer too
// Add device on the (already-initialized) I2C bus
const i2c_device_config_t dev_cfg = {
.dev_addr_length = I2C_ADDR_BIT_LEN_7,
.device_address = config->i2c_addr ? config->i2c_addr : ST7567_I2C_ADDR_DEFAULT,
.scl_speed_hz = config->i2c_clock_speed_hz ? config->i2c_clock_speed_hz : ST7567_DEFAULT_CLOCK_HZ,
};
const esp_err_t ret = i2c_master_bus_add_device(config->i2c_bus, &dev_cfg, &device->i2c_dev);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to add I2C device: %s", esp_err_to_name(ret));
return ret;
}
// internal software reset + init sequence (standard ST7567 sequence)
st7567_send_cmd(device, ST7567_CMD_RESET);
vTaskDelay(pdMS_TO_TICKS(10));
st7567_send_cmd(device, ST7567_CMD_BIAS_1_9);
st7567_send_cmd(device, ST7567_CMD_ADC_NORMAL);
st7567_send_cmd(device, ST7567_CMD_COM_REVERSE);
st7567_send_cmd(device, ST7567_CMD_RESISTOR_RATIO | 0x03);
st7567_send_cmd(device, ST7567_CMD_POWER_CTRL | 0x07); // booster, regulator, follower all on
vTaskDelay(pdMS_TO_TICKS(10)); // let the charge pump stabilize before touching contrast
st7567_set_contrast(device, config->contrast ? config->contrast : ST7567_DEFAULT_CONTRAST);
st7567_send_cmd(device, ST7567_CMD_START_LINE | 0x00);
st7567_send_cmd(device, ST7567_CMD_ALL_PIXEL_NORMAL);
st7567_send_cmd(device, ST7567_CMD_DISPLAY_NORMAL);
st7567_send_cmd(device, ST7567_CMD_DISPLAY_ON);
ESP_LOGI(TAG, "display init done");
return ESP_OK;
}
#endif
#ifdef ST7567_SPI_H
#define ST7567_SPI_TIMEOUT_MS 100
#define ST7567_DEFAULT_SPI_CLOCK_HZ 8000000
#define ST7567_DC_CMD 0
#define ST7567_DC_DATA 1
static esp_err_t st7567_write(const st7567_device_t *dev, int dc_level, const uint8_t *data, size_t len) {
static esp_err_t st7567_write_spi(const st7567_device_t *dev, int dc_level, const uint8_t *data, size_t len) {
if (len == 0)
return ESP_OK;
@@ -99,65 +36,19 @@ static esp_err_t st7567_write(const st7567_device_t *dev, int dc_level, const ui
}
esp_err_t st7567_send_cmd(const st7567_device_t *dev, const uint8_t cmd) {
return st7567_write(dev, ST7567_DC_CMD, &cmd, 1);
inline static esp_err_t st7567_send_cmd(const st7567_device_t *dev, const uint8_t cmd) {
if (dev->bus_type == ST7567_BUS_TYPE_SPI)
return st7567_write_spi(dev, ST7567_DC_CMD, &cmd, 1);
return st7567_write_i2c(dev, ST7567_I2C_CTRL_CMD, &cmd, 1);
}
esp_err_t st7567_send_data(const st7567_device_t *dev, const uint8_t *data, size_t len) {
return st7567_write(dev, ST7567_DC_DATA, data, len);
}
esp_err_t st7567_init(const st7567_spi_config_t *config, st7567_device_t *device) {
memset(device, 0, sizeof(st7567_device_t)); // clears framebuffer too
device->dc_gpio = config->dc_gpio;
// DC is toggled every single command/data write, so drive it directly
// rather than routing it through the SPI peripheral
gpio_config_t dc_cfg = {
.pin_bit_mask = 1ULL << config->dc_gpio,
.mode = GPIO_MODE_OUTPUT,
};
esp_err_t ret = gpio_config(&dc_cfg);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to configure DC gpio: %s", esp_err_to_name(ret));
return ret;
}
if (config->rst_gpio != GPIO_NUM_NC) {
gpio_config_t rst_cfg = {
.pin_bit_mask = 1ULL << config->rst_gpio,
.mode = GPIO_MODE_OUTPUT,
};
ret = gpio_config(&rst_cfg);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to configure RST gpio: %s", esp_err_to_name(ret));
return ret;
}
// hardware reset pulse, active low - panel datasheets typically want
// >=1us low, we hold well past that
gpio_set_level(config->rst_gpio, 0);
vTaskDelay(pdMS_TO_TICKS(10));
gpio_set_level(config->rst_gpio, 1);
vTaskDelay(pdMS_TO_TICKS(10));
}
// Add device on the (already-initialized) SPI bus
const spi_device_interface_config_t dev_cfg = {
.clock_speed_hz = config->spi_clock_speed_hz ? config->spi_clock_speed_hz : ST7567_DEFAULT_CLOCK_HZ,
.mode = 0, // CPOL=0, CPHA=0 - standard for ST7567, check your panel if init garbles
.spics_io_num = config->cs_gpio,
.queue_size = 1,
};
ret = spi_bus_add_device(config->spi_host, &dev_cfg, &device->spi_dev);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to add SPI device: %s", esp_err_to_name(ret));
return ret;
inline static esp_err_t st7567_send_data(const st7567_device_t *dev, const uint8_t *data, size_t len) {
if (dev->bus_type == ST7567_BUS_TYPE_SPI)
return st7567_write_spi(dev, ST7567_DC_DATA, data, len);
return st7567_write_i2c(dev, ST7567_I2C_CTRL_DATA, data, len);
}
static void st7567_send_init(const st7567_device_t *device, const uint8_t contrast) {
// internal software reset + init sequence (standard ST7567 sequence)
st7567_send_cmd(device, ST7567_CMD_RESET);
vTaskDelay(pdMS_TO_TICKS(10));
@@ -168,25 +59,95 @@ esp_err_t st7567_init(const st7567_spi_config_t *config, st7567_device_t *device
st7567_send_cmd(device, ST7567_CMD_POWER_CTRL | 0x07); // booster, regulator, follower all on
vTaskDelay(pdMS_TO_TICKS(10)); // let the charge pump stabilize before touching contrast
st7567_set_contrast(device, config->contrast ? config->contrast : ST7567_DEFAULT_CONTRAST);
st7567_set_contrast(device, contrast ? contrast : ST7567_DEFAULT_CONTRAST);
st7567_send_cmd(device, ST7567_CMD_START_LINE | 0x00);
st7567_send_cmd(device, ST7567_CMD_ALL_PIXEL_NORMAL);
st7567_send_cmd(device, ST7567_CMD_DISPLAY_NORMAL);
st7567_send_cmd(device, ST7567_CMD_DISPLAY_ON);
}
esp_err_t st7567_init_i2c(const st7567_config_i2c_t *config, st7567_device_t *device) {
memset(device, 0, sizeof(st7567_device_t)); // clears framebuffer too
device->bus_type = ST7567_BUS_TYPE_I2C;
// Add device on the (already-initialized) I2C bus
const i2c_device_config_t dev_cfg = {
.dev_addr_length = I2C_ADDR_BIT_LEN_7,
.device_address = config->i2c_addr ? config->i2c_addr : ST7567_I2C_ADDR_DEFAULT,
.scl_speed_hz = config->i2c_clock_speed_hz ? config->i2c_clock_speed_hz : ST7567_DEFAULT_I2C_CLOCK_HZ,
};
const esp_err_t ret = i2c_master_bus_add_device(config->i2c_bus, &dev_cfg, (i2c_master_dev_handle_t *)&device->bus);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to add I2C device: %s", esp_err_to_name(ret));
return ret;
}
st7567_send_init(device, config->contrast);
ESP_LOGI(TAG, "display init done");
return ESP_OK;
}
#endif
esp_err_t st7567_init_spi(const st7567_config_spi_t *config, st7567_device_t *device) {
memset(device, 0, sizeof(st7567_device_t)); // clears framebuffer too
device->bus_type = ST7567_BUS_TYPE_SPI;
device->dc_gpio = config->dc_gpio;
// DC is toggled every single command/data write, so drive it directly
// rather than routing it through the SPI peripheral
const gpio_config_t dc_cfg = {
.pin_bit_mask = 1ULL << config->dc_gpio,
.mode = GPIO_MODE_OUTPUT,
};
esp_err_t ret = gpio_config(&dc_cfg);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to configure DC gpio: %s", esp_err_to_name(ret));
return ret;
}
if (config->rst_gpio != GPIO_NUM_NC) {
const gpio_config_t rst_cfg = {
.pin_bit_mask = 1ULL << config->rst_gpio,
.mode = GPIO_MODE_OUTPUT,
};
ret = gpio_config(&rst_cfg);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to configure RST gpio: %s", esp_err_to_name(ret));
return ret;
}
gpio_set_level(config->rst_gpio, 0);
vTaskDelay(pdMS_TO_TICKS(10));
gpio_set_level(config->rst_gpio, 1);
vTaskDelay(pdMS_TO_TICKS(10));
}
// Add device on the (already-initialized) SPI bus
const spi_device_interface_config_t dev_cfg = {
.clock_speed_hz = config->spi_clock_speed_hz ? (int)config->spi_clock_speed_hz : ST7567_DEFAULT_SPI_CLOCK_HZ,
.mode = 0, // CPOL=0, CPHA=0 - standard for ST7567, check your panel if init garbles
.spics_io_num = config->cs_gpio,
.queue_size = 1,
};
ret = spi_bus_add_device(config->spi_host, &dev_cfg, (spi_device_handle_t*)&device->bus);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to add SPI device: %s", esp_err_to_name(ret));
return ret;
}
st7567_send_init(device, config->contrast);
ESP_LOGI(TAG, "display init done");
return ESP_OK;
}
esp_err_t st7567_set_contrast(const st7567_device_t *dev, uint8_t contrast) {
if (contrast > 63)
contrast = 63;
esp_err_t ret = st7567_send_cmd(dev, ST7567_CMD_CONTRAST_MODE);
const esp_err_t ret = st7567_send_cmd(dev, ST7567_CMD_CONTRAST_MODE);
if (ret != ESP_OK)
return ret;
@@ -203,14 +164,16 @@ esp_err_t st7567_clear(st7567_device_t *dev) {
}
esp_err_t st7567_update_screen(const st7567_device_t *dev) {
// ST7567 is page-addressed: 8 pages of 8 vertical px each, byte = one column
// within a page (LSB = top row of the page). Same layout as SSD1306.
for (uint8_t page = 0; page < ST7567_PAGES; page++) {
esp_err_t ret;
if ((ret = st7567_send_cmd(dev, ST7567_CMD_PAGE_ADDR | page)) != ESP_OK) return ret;
if ((ret = st7567_send_cmd(dev, ST7567_CMD_COL_ADDR_HIGH | 0x00)) != ESP_OK) return ret;
if ((ret = st7567_send_cmd(dev, ST7567_CMD_COL_ADDR_LOW | 0x00)) != ESP_OK) return ret;
if ((ret = st7567_send_data(dev, &dev->framebuffer[page * ST7567_WIDTH], ST7567_WIDTH)) != ESP_OK) return ret;
if ((ret = st7567_send_cmd(dev, ST7567_CMD_PAGE_ADDR | page)) != ESP_OK)
return ret;
if ((ret = st7567_send_cmd(dev, ST7567_CMD_COL_ADDR_HIGH | 0x00)) != ESP_OK)
return ret;
if ((ret = st7567_send_cmd(dev, ST7567_CMD_COL_ADDR_LOW | 0x00)) != ESP_OK)
return ret;
if ((ret = st7567_send_data(dev, &dev->framebuffer[page * ST7567_WIDTH], ST7567_WIDTH)) != ESP_OK)
return ret;
}
return ESP_OK;

70
st7567/st7567-common.h → st7567/st7567.h
View File

@@ -3,6 +3,16 @@
#include <esp_err.h>
#include <stdint.h>
#include <soc/gpio_num.h>
#include <driver/spi_master.h>
#include <driver/i2c_master.h>
#include <driver/gpio.h>
// Display dimensions
#define ST7567_WIDTH 128
#define ST7567_HEIGHT 64
#define ST7567_PAGES (ST7567_HEIGHT / 8)
#define ST7567_DEFAULT_CONTRAST 0x35
// ST7567 command set
#define ST7567_CMD_DISPLAY_OFF 0xAE
@@ -28,36 +38,62 @@
#define ST7567_CMD_STATIC_INDICATOR_OFF 0xAC
#define ST7567_CMD_NOP 0xE3
// Display dimensions
#define ST7567_WIDTH 128
#define ST7567_HEIGHT 64
#define ST7567_PAGES (ST7567_HEIGHT / 8)
#define ST7567_I2C_ADDR_DEFAULT 0x3f
#define ST7567_I2C_CTRL_CMD 0x00
#define ST7567_I2C_CTRL_DATA 0x40
#define ST7567_I2C_TIMEOUT_MS 100
#define ST7567_DEFAULT_I2C_CLOCK_HZ 400000
#define ST7567_SPI_TIMEOUT_MS 100
#define ST7567_DEFAULT_SPI_CLOCK_HZ 8000000
#define ST7567_DC_CMD 0
#define ST7567_DC_DATA 1
typedef enum {
ST7567_BUS_TYPE_I2C,
ST7567_BUS_TYPE_SPI,
} st7567_bus_type_t;
typedef struct {
void *bus;
st7567_bus_type_t bus_type;
gpio_num_t dc_gpio;
uint8_t framebuffer[ST7567_WIDTH * ST7567_PAGES];
} st7567_device_t;
/**
* @brief Send a single command byte to the ST7567
*
* @param dev Device handle
* @param cmd Command byte
* @return esp_err_t ESP_OK on success
*/
esp_err_t st7567_send_cmd(const st7567_device_t *dev, uint8_t cmd);
typedef struct {
i2c_master_bus_handle_t i2c_bus; // already-initialized I2C bus
uint16_t i2c_addr; // 7-bit device address, 0 = use ST7567_I2C_ADDR_DEFAULT
uint32_t i2c_clock_speed_hz; // 0 = use 400kHz default
uint8_t contrast; // 0-63, 0 = use a sane default (0x20)
} st7567_config_i2c_t;
typedef struct {
spi_host_device_t spi_host; // already-initialized SPI bus (spi_bus_initialize called by caller)
gpio_num_t cs_gpio; // chip select
gpio_num_t dc_gpio; // data/command select (required, no in-band control byte over SPI)
gpio_num_t rst_gpio; // hardware reset, GPIO_NUM_NC if not wired
uint32_t spi_clock_speed_hz; // 0 = use 8MHz default
uint8_t contrast; // 0-63, 0 = use a sane default (0x20)
} st7567_config_spi_t;
/**
* @brief Send a data buffer to the ST7567
* @brief Initialize ST7567 display on an I2C bus
*
* @param dev Device handle
* @param data Pointer to data buffer
* @param len Length of data buffer
* @param config Configuration structure
* @param device Pointer to store device state (framebuffer etc, caller-owned)
* @return esp_err_t ESP_OK on success
*/
esp_err_t st7567_send_data(const st7567_device_t *dev, const uint8_t *data, size_t len);
esp_err_t st7567_init_i2c(const st7567_config_i2c_t *config, st7567_device_t *device);
/**
* @brief Initialize ST7567 display on an SPI bus
*
* @param config Configuration structure
* @param device Pointer to store device state (framebuffer etc, caller-owned)
* @return esp_err_t ESP_OK on success
*/
esp_err_t st7567_init_spi(const st7567_config_spi_t *config, st7567_device_t *device);
/**
* @brief Clear the display (just wipe framebuffer, don't send any commands)