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zephyr/drivers/grove/lcd_rgb.c

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/*
* Copyright (c) 2015 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <errno.h>
#include <kernel.h>
#include <init.h>
#include <stdbool.h>
#include <i2c.h>
#include <display/grove_lcd.h>
#include <misc/util.h>
#define SYS_LOG_DOMAIN "Grove LCD"
#define SYS_LOG_LEVEL CONFIG_SYS_LOG_GROVE_LEVEL
#include <logging/sys_log.h>
#define SLEEP_IN_US(_x_) ((_x_) * 1000)
#define GROVE_LCD_DISPLAY_ADDR (0x3E)
#define GROVE_RGB_BACKLIGHT_ADDR (0x62)
struct command {
u8_t control;
u8_t data;
};
struct glcd_data {
struct device *i2c;
u8_t input_set;
u8_t display_switch;
u8_t function;
};
struct glcd_driver {
u16_t lcd_addr;
u16_t rgb_addr;
};
#define ON 0x1
#define OFF 0x0
/********************************************
* LCD FUNCTIONS
*******************************************/
/* GLCD_CMD_SCREEN_CLEAR has no options */
/* GLCD_CMD_CURSOR_RETURN has no options */
/* Defines for the GLCD_CMD_CURSOR_SHIFT */
#define GLCD_CS_DISPLAY_SHIFT (1 << 3)
#define GLCD_CS_RIGHT_SHIFT (1 << 2)
/* LCD Display Commands */
#define GLCD_CMD_SCREEN_CLEAR (1 << 0)
#define GLCD_CMD_CURSOR_RETURN (1 << 1)
#define GLCD_CMD_INPUT_SET (1 << 2)
#define GLCD_CMD_DISPLAY_SWITCH (1 << 3)
#define GLCD_CMD_CURSOR_SHIFT (1 << 4)
#define GLCD_CMD_FUNCTION_SET (1 << 5)
#define GLCD_CMD_SET_CGRAM_ADDR (1 << 6)
#define GLCD_CMD_SET_DDRAM_ADDR (1 << 7)
/********************************************
* RGB FUNCTIONS
*******************************************/
#define REGISTER_POWER 0x08
#define REGISTER_R 0x04
#define REGISTER_G 0x03
#define REGISTER_B 0x02
static u8_t color_define[][3] = {
{ 255, 255, 255 }, /* white */
{ 255, 0, 0 }, /* red */
{ 0, 255, 0 }, /* green */
{ 0, 0, 255 }, /* blue */
};
/********************************************
* PRIVATE FUNCTIONS
*******************************************/
static void _rgb_reg_set(struct device * const i2c, u8_t addr, u8_t dta)
{
u8_t data[2] = { addr, dta };
i2c_write(i2c, data, sizeof(data), GROVE_RGB_BACKLIGHT_ADDR);
}
static inline void _sleep(u32_t sleep_in_ms)
{
k_busy_wait(SLEEP_IN_US(sleep_in_ms));
}
/********************************************
* PUBLIC FUNCTIONS
*******************************************/
void glcd_print(struct device *port, char *data, u32_t size)
{
const struct glcd_driver * const rom = (struct glcd_driver *)
port->config->config_info;
struct glcd_data *dev = port->driver_data;
u8_t buf[] = { GLCD_CMD_SET_CGRAM_ADDR, 0 };
int i;
for (i = 0; i < size; i++) {
buf[1] = data[i];
i2c_write(dev->i2c, buf, sizeof(buf), rom->lcd_addr);
}
}
void glcd_cursor_pos_set(struct device *port, u8_t col, u8_t row)
{
const struct glcd_driver * const rom = (struct glcd_driver *)
port->config->config_info;
struct glcd_data *dev = port->driver_data;
unsigned char data[2];
if (row == 0) {
col |= 0x80;
} else {
col |= 0xC0;
}
data[0] = GLCD_CMD_SET_DDRAM_ADDR;
data[1] = col;
i2c_write(dev->i2c, data, 2, rom->lcd_addr);
}
void glcd_clear(struct device *port)
{
const struct glcd_driver * const rom = (struct glcd_driver *)
port->config->config_info;
struct glcd_data *dev = port->driver_data;
u8_t clear[] = { 0, GLCD_CMD_SCREEN_CLEAR };
i2c_write(dev->i2c, clear, sizeof(clear), rom->lcd_addr);
SYS_LOG_DBG("clear, delay 20 ms");
_sleep(20);
}
void glcd_display_state_set(struct device *port, u8_t opt)
{
const struct glcd_driver * const rom = (struct glcd_driver *)
port->config->config_info;
struct glcd_data *dev = port->driver_data;
u8_t data[] = { 0, 0 };
dev->display_switch = opt;
data[1] = (opt | GLCD_CMD_DISPLAY_SWITCH);
i2c_write(dev->i2c, data, sizeof(data), rom->lcd_addr);
SYS_LOG_DBG("set display_state options, delay 5 ms");
_sleep(5);
}
u8_t glcd_display_state_get(struct device *port)
{
struct glcd_data *dev = port->driver_data;
return dev->display_switch;
}
void glcd_input_state_set(struct device *port, u8_t opt)
{
const struct glcd_driver * const rom = port->config->config_info;
struct glcd_data *dev = port->driver_data;
u8_t data[] = { 0, 0 };
dev->input_set = opt;
data[1] = (opt | GLCD_CMD_INPUT_SET);
i2c_write(dev->i2c, &dev->input_set, sizeof(dev->input_set),
rom->lcd_addr);
SYS_LOG_DBG("set the input_set, no delay");
}
u8_t glcd_input_state_get(struct device *port)
{
struct glcd_data *dev = port->driver_data;
return dev->input_set;
}
void glcd_color_select(struct device *port, u8_t color)
{
if (color > 3) {
SYS_LOG_WRN("selected color is too high a value");
return;
}
glcd_color_set(port, color_define[color][0],
color_define[color][1],
color_define[color][2]);
}
void glcd_color_set(struct device *port, u8_t r, u8_t g, u8_t b)
{
struct glcd_data * const dev = port->driver_data;
_rgb_reg_set(dev->i2c, REGISTER_R, r);
_rgb_reg_set(dev->i2c, REGISTER_G, g);
_rgb_reg_set(dev->i2c, REGISTER_B, b);
}
void glcd_function_set(struct device *port, u8_t opt)
{
const struct glcd_driver * const rom = port->config->config_info;
struct glcd_data *dev = port->driver_data;
u8_t data[] = { 0, 0 };
dev->function = opt;
data[1] = (opt | GLCD_CMD_FUNCTION_SET);
i2c_write(dev->i2c, data, sizeof(data), rom->lcd_addr);
SYS_LOG_DBG("set function options, delay 5 ms");
_sleep(5);
}
u8_t glcd_function_get(struct device *port)
{
struct glcd_data *dev = port->driver_data;
return dev->function;
}
int glcd_initialize(struct device *port)
{
struct glcd_data *dev = port->driver_data;
u8_t cmd;
SYS_LOG_DBG("initialize called");
dev->input_set = 0;
dev->display_switch = 0;
dev->function = 0;
/*
* First set up the device driver...
* we need a pointer to the I2C device we are bound to
*/
dev->i2c = device_get_binding(
CONFIG_GROVE_LCD_RGB_I2C_MASTER_DEV_NAME);
if (!dev->i2c) {
return -EPERM;
}
/* Since device_get_binding() will not return any
* reference to a driver instance if port->driver_api
* is NULL and grove_lcd does not have any API struct,
* just populate it with some magic number
* so grove_lcd can be referenced.
*
* Since dev is probably still in registers.
* use that to minimize code addition.
*/
port->driver_api = (void *)dev;
/*
* Initialization sequence from the data sheet:
* 1 - Power on
* - Wait for more than 30 ms AFTER VDD rises to 4.5v
* 2 - Send FUNCTION set
* - Wait for 39 us
* 3 - Send DISPLAY Control
* - wait for 39 us
* 4 - send DISPLAY Clear
* - wait for 1.5 ms
* 5 - send ENTRY Mode
* 6 - Initialization is done
*/
/*
* We're here! Let's just make sure we've had enough time for the
* VDD to power on, so pause a little here, 30 ms min, so we go 50
*/
SYS_LOG_DBG("delay 50 ms while the VDD powers on");
_sleep(50);
/* Configure everything for the display function first */
cmd = GLCD_CMD_FUNCTION_SET | GLCD_FS_ROWS_2;
glcd_function_set(port, cmd);
/* turn the display on - by default no cursor and no blinking */
cmd = GLCD_DS_DISPLAY_ON | GLCD_DS_CURSOR_OFF | GLCD_DS_BLINK_OFF;
glcd_display_state_set(port, cmd);
/* Clear the screen */
glcd_clear(port);
/* Initialize to the default text direction for romance languages */
cmd = GLCD_IS_ENTRY_LEFT | GLCD_IS_SHIFT_DECREMENT;
glcd_input_state_set(port, cmd);
/* Now power on the background RGB control */
SYS_LOG_INF("configuring the RGB background");
_rgb_reg_set(dev->i2c, 0x00, 0x00);
_rgb_reg_set(dev->i2c, 0x01, 0x05);
_rgb_reg_set(dev->i2c, 0x08, 0xAA);
/* Now set the background color to white */
SYS_LOG_DBG("background set to white");
_rgb_reg_set(dev->i2c, REGISTER_R, color_define[GROVE_RGB_WHITE][0]);
_rgb_reg_set(dev->i2c, REGISTER_G, color_define[GROVE_RGB_WHITE][1]);
_rgb_reg_set(dev->i2c, REGISTER_B, color_define[GROVE_RGB_WHITE][2]);
return 0;
}
static const struct glcd_driver grove_lcd_config = {
.lcd_addr = GROVE_LCD_DISPLAY_ADDR,
.rgb_addr = GROVE_RGB_BACKLIGHT_ADDR,
};
static struct glcd_data grove_lcd_driver = {
.i2c = NULL,
.input_set = 0,
.display_switch = 0,
.function = 0,
};
DEVICE_INIT(grove_lcd, GROVE_LCD_NAME, glcd_initialize,
&grove_lcd_driver, &grove_lcd_config,
POST_KERNEL, CONFIG_APPLICATION_INIT_PRIORITY);
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