360 lines
8.7 KiB
C
360 lines
8.7 KiB
C
/*
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* Copyright (c) 2015 Intel Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <nanokernel.h>
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#include <init.h>
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#include <stdbool.h>
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#include <i2c.h>
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#include <display/grove_lcd.h>
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#include <misc/util.h>
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#define SYS_LOG_DOMAIN "Grove LCD"
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#define SYS_LOG_LEVEL CONFIG_SYS_LOG_GROVE_LEVEL
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#include <misc/sys_log.h>
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#define SLEEP_IN_US(_x_) ((_x_) * 1000)
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#define GROVE_LCD_DISPLAY_ADDR (0x3E)
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#define GROVE_RGB_BACKLIGHT_ADDR (0x62)
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struct command {
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uint8_t control;
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uint8_t data;
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};
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struct glcd_data {
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struct device *i2c;
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uint8_t input_set;
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uint8_t display_switch;
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uint8_t function;
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};
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struct glcd_driver {
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uint16_t lcd_addr;
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uint16_t rgb_addr;
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};
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#define ON 0x1
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#define OFF 0x0
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/********************************************
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* LCD FUNCTIONS
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*******************************************/
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/* GLCD_CMD_SCREEN_CLEAR has no options */
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/* GLCD_CMD_CURSOR_RETURN has no options */
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/* Defines for the GLCD_CMD_CURSOR_SHIFT */
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#define GLCD_CS_DISPLAY_SHIFT (1 << 3)
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#define GLCD_CS_RIGHT_SHIFT (1 << 2)
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/* LCD Display Commands */
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#define GLCD_CMD_SCREEN_CLEAR (1 << 0)
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#define GLCD_CMD_CURSOR_RETURN (1 << 1)
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#define GLCD_CMD_INPUT_SET (1 << 2)
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#define GLCD_CMD_DISPLAY_SWITCH (1 << 3)
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#define GLCD_CMD_CURSOR_SHIFT (1 << 4)
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#define GLCD_CMD_FUNCTION_SET (1 << 5)
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#define GLCD_CMD_SET_CGRAM_ADDR (1 << 6)
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#define GLCD_CMD_SET_DDRAM_ADDR (1 << 7)
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/********************************************
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* RGB FUNCTIONS
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*******************************************/
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#define REGISTER_POWER 0x08
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#define REGISTER_R 0x04
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#define REGISTER_G 0x03
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#define REGISTER_B 0x02
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static uint8_t color_define[][3] = {
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{ 255, 255, 255 }, /* white */
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{ 255, 0, 0 }, /* red */
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{ 0, 255, 0 }, /* green */
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{ 0, 0, 255 }, /* blue */
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};
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/********************************************
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* PRIVATE FUNCTIONS
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*******************************************/
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static void _rgb_reg_set(struct device * const i2c, uint8_t addr, uint8_t dta)
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{
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uint8_t data[2] = { addr, dta };
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i2c_write(i2c, data, sizeof(data), GROVE_RGB_BACKLIGHT_ADDR);
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}
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static inline void _sleep(uint32_t sleep_in_ms)
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{
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sys_thread_busy_wait(SLEEP_IN_US(sleep_in_ms));
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}
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/********************************************
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* PUBLIC FUNCTIONS
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*******************************************/
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void glcd_print(struct device *port, unsigned char *data, uint32_t size)
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{
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const struct glcd_driver * const rom = (struct glcd_driver *)
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port->config->config_info;
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struct glcd_data *dev = port->driver_data;
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uint8_t buf[] = { GLCD_CMD_SET_CGRAM_ADDR, 0 };
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int i;
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for (i = 0; i < size; i++) {
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buf[1] = data[i];
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i2c_write(dev->i2c, buf, sizeof(buf), rom->lcd_addr);
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}
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}
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void glcd_cursor_pos_set(struct device *port, uint8_t col, uint8_t row)
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{
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const struct glcd_driver * const rom = (struct glcd_driver *)
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port->config->config_info;
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struct glcd_data *dev = port->driver_data;
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unsigned char data[2];
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if (row == 0) {
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col |= 0x80;
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} else {
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col |= 0xC0;
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}
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data[0] = GLCD_CMD_SET_DDRAM_ADDR;
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data[1] = col;
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i2c_write(dev->i2c, data, 2, rom->lcd_addr);
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}
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void glcd_clear(struct device *port)
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{
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const struct glcd_driver * const rom = (struct glcd_driver *)
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port->config->config_info;
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struct glcd_data *dev = port->driver_data;
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uint8_t clear[] = { 0, GLCD_CMD_SCREEN_CLEAR };
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i2c_write(dev->i2c, clear, sizeof(clear), rom->lcd_addr);
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SYS_LOG_DBG("clear, delay 20 ms");
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_sleep(20);
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}
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void glcd_display_state_set(struct device *port, uint8_t opt)
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{
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const struct glcd_driver * const rom = (struct glcd_driver *)
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port->config->config_info;
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struct glcd_data *dev = port->driver_data;
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uint8_t data[] = { 0, 0 };
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dev->display_switch = opt;
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data[1] = (opt | GLCD_CMD_DISPLAY_SWITCH);
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i2c_write(dev->i2c, data, sizeof(data), rom->lcd_addr);
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SYS_LOG_DBG("set display_state options, delay 5 ms");
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_sleep(5);
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}
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uint8_t glcd_display_state_get(struct device *port)
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{
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struct glcd_data *dev = port->driver_data;
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return dev->display_switch;
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}
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void glcd_input_state_set(struct device *port, uint8_t opt)
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{
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const struct glcd_driver * const rom = port->config->config_info;
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struct glcd_data *dev = port->driver_data;
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uint8_t data[] = { 0, 0 };
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dev->input_set = opt;
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data[1] = (opt | GLCD_CMD_INPUT_SET);
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i2c_write(dev->i2c, &dev->input_set, sizeof(dev->input_set),
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rom->lcd_addr);
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SYS_LOG_DBG("set the input_set, no delay");
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}
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uint8_t glcd_input_state_get(struct device *port)
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{
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struct glcd_data *dev = port->driver_data;
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return dev->input_set;
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}
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void glcd_color_select(struct device *port, uint8_t color)
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{
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if (color > 3) {
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SYS_LOG_WRN("selected color is too high a value");
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return;
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}
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glcd_color_set(port, color_define[color][0],
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color_define[color][1],
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color_define[color][2]);
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}
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void glcd_color_set(struct device *port, uint8_t r, uint8_t g, uint8_t b)
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{
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struct glcd_data * const dev = port->driver_data;
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_rgb_reg_set(dev->i2c, REGISTER_R, r);
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_rgb_reg_set(dev->i2c, REGISTER_G, g);
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_rgb_reg_set(dev->i2c, REGISTER_B, b);
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}
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void glcd_function_set(struct device *port, uint8_t opt)
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{
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const struct glcd_driver * const rom = port->config->config_info;
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struct glcd_data *dev = port->driver_data;
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uint8_t data[] = { 0, 0 };
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dev->function = opt;
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data[1] = (opt | GLCD_CMD_FUNCTION_SET);
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i2c_write(dev->i2c, data, sizeof(data), rom->lcd_addr);
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SYS_LOG_DBG("set function options, delay 5 ms");
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_sleep(5);
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}
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uint8_t glcd_function_get(struct device *port)
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{
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struct glcd_data *dev = port->driver_data;
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return dev->function;
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}
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int glcd_initialize(struct device *port)
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{
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struct glcd_data *dev = port->driver_data;
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uint8_t cmd;
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SYS_LOG_DBG("initialize called");
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dev->input_set = 0;
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dev->display_switch = 0;
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dev->function = 0;
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/*
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* First set up the device driver...
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* we need a pointer to the I2C device we are bound to
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*/
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dev->i2c = device_get_binding(
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CONFIG_GROVE_LCD_RGB_I2C_MASTER_DEV_NAME);
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if (!dev->i2c) {
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return -EPERM;
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}
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/* Since device_get_binding() will not return any
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* reference to a driver instance if port->driver_api
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* is NULL and grove_lcd does not have any API struct,
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* just populate it with some magic number
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* so grove_lcd can be referenced.
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*
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* Since dev is probably still in registers.
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* use that to minimize code addition.
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*/
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port->driver_api = (void *)dev;
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/*
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* Initialization sequence from the data sheet:
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* 1 - Power on
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* - Wait for more than 30 ms AFTER VDD rises to 4.5v
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* 2 - Send FUNCTION set
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* - Wait for 39 us
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* 3 - Send DISPLAY Control
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* - wait for 39 us
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* 4 - send DISPLAY Clear
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* - wait for 1.5 ms
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* 5 - send ENTRY Mode
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* 6 - Initialization is done
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*/
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/*
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* We're here! Let's just make sure we've had enough time for the
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* VDD to power on, so pause a little here, 30 ms min, so we go 50
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*/
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SYS_LOG_DBG("delay 50 ms while the VDD powers on");
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_sleep(50);
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/* Configure everything for the display function first */
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cmd = GLCD_CMD_FUNCTION_SET | GLCD_FS_ROWS_2;
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glcd_function_set(port, cmd);
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/* turn the display on - by default no cursor and no blinking */
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cmd = GLCD_DS_DISPLAY_ON | GLCD_DS_CURSOR_OFF | GLCD_DS_BLINK_OFF;
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glcd_display_state_set(port, cmd);
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/* Clear the screen */
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glcd_clear(port);
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/* Initialize to the default text direction for romance languages */
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cmd = GLCD_IS_ENTRY_LEFT | GLCD_IS_SHIFT_DECREMENT;
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glcd_input_state_set(port, cmd);
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/* Now power on the background RGB control */
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SYS_LOG_INF("configuring the RGB background");
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_rgb_reg_set(dev->i2c, 0x00, 0x00);
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_rgb_reg_set(dev->i2c, 0x01, 0x05);
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_rgb_reg_set(dev->i2c, 0x08, 0xAA);
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/* Now set the background color to white */
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SYS_LOG_DBG("background set to white");
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_rgb_reg_set(dev->i2c, REGISTER_R, color_define[GROVE_RGB_WHITE][0]);
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_rgb_reg_set(dev->i2c, REGISTER_G, color_define[GROVE_RGB_WHITE][1]);
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_rgb_reg_set(dev->i2c, REGISTER_B, color_define[GROVE_RGB_WHITE][2]);
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return 0;
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}
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static const struct glcd_driver grove_lcd_config = {
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.lcd_addr = GROVE_LCD_DISPLAY_ADDR,
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.rgb_addr = GROVE_RGB_BACKLIGHT_ADDR,
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};
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static struct glcd_data grove_lcd_driver = {
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.i2c = NULL,
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.input_set = 0,
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.display_switch = 0,
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.function = 0,
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};
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DEVICE_INIT(grove_lcd, GROVE_LCD_NAME, glcd_initialize,
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&grove_lcd_driver, &grove_lcd_config,
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NANOKERNEL, CONFIG_APPLICATION_INIT_PRIORITY);
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