1 /*
2 * SPDX-License-Identifier: Apache-2.0
3 * Copyright (C) 2022, Intel Corporation
4 * Description:
5 * Example to use LCD Display in Cyclone V SoC FPGA devkit
6 */
7
8 #include <zephyr/sys/printk.h>
9 #include <stdio.h>
10 #include <string.h>
11 #include <zephyr/drivers/i2c.h>
12 #include <zephyr/kernel.h>
13 #include "commands.h"
14 #define I2C_INST DT_NODELABEL(i2c0)
15 #define LCD_ADDRESS 0x28
16
17 const struct device *const i2c = DEVICE_DT_GET(I2C_INST);
18
send_ascii(char c)19 void send_ascii(char c)
20 {
21
22 const uint8_t buf = c;
23 int ret;
24
25 ret = i2c_write(i2c, &buf, sizeof(buf), LCD_ADDRESS);
26
27 if (ret != 0) {
28 printf("Fail!\n");
29 } else {
30 printf("Success!\n");
31 }
32 }
33
send_string(uint8_t * str_ptr,int len)34 void send_string(uint8_t *str_ptr, int len)
35 {
36 int ret;
37
38 ret = i2c_write(i2c, str_ptr, len, LCD_ADDRESS);
39
40 if (ret != 0) {
41 printf("Fail!\n");
42 } else {
43 printf("Success!\n");
44 }
45 }
46
send_command_no_param(uint8_t command_id)47 void send_command_no_param(uint8_t command_id)
48 {
49 const uint8_t buf[] = {0xFE, command_id};
50
51 int ret;
52
53 ret = i2c_write(i2c, (const uint8_t *) &buf, sizeof(buf), LCD_ADDRESS);
54
55 if (ret != 0) {
56 printf("Fail!\n");
57 } else {
58 printf("Success!\n");
59 }
60 }
61
send_command_one_param(uint8_t command_id,uint8_t param)62 void send_command_one_param(uint8_t command_id, uint8_t param)
63 {
64 const uint8_t buf[] = { 0xFE, command_id, param};
65
66 int ret;
67
68 ret = i2c_write(i2c, (const uint8_t *) &buf, sizeof(buf), LCD_ADDRESS);
69
70 if (ret != 0) {
71 printf("Fail!\n");
72 } else {
73 printf("Success!\n");
74 }
75 }
76
clear(void)77 void clear(void)
78 {
79 send_command_no_param(CLEAR_SCREEN);
80 }
81
next_line(void)82 void next_line(void)
83 {
84 send_command_one_param(SET_CURSOR, 0x40);
85 }
86
main(void)87 int main(void)
88 {
89 printk("Hello World! %s\n", CONFIG_BOARD);
90 static const unsigned char string[] = "Hello world!";
91 int len = strlen((const unsigned char *) &string);
92
93 if (!device_is_ready(i2c)) {
94 printf("i2c is not ready!\n");
95 } else {
96 printf("i2c is ready\n");
97 }
98
99 send_ascii('A');
100 k_sleep(K_MSEC(1000));
101 next_line();
102 k_sleep(K_MSEC(10));
103 send_string((uint8_t *)&string, len);
104
105 return 0;
106 }
107
