SSD1306 OLED display driver  1.6.99
This library is developed to control SSD1306/SSD1331/SSD1351/IL9163/PCD8554 RGB i2c/spi LED displays
io.h
1 /*
2  MIT License
3 
4  Copyright (c) 2018, Alexey Dynda
5 
6  Permission is hereby granted, free of charge, to any person obtaining a copy
7  of this software and associated documentation files (the "Software"), to deal
8  in the Software without restriction, including without limitation the rights
9  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10  copies of the Software, and to permit persons to whom the Software is
11  furnished to do so, subject to the following conditions:
12 
13  The above copyright notice and this permission notice shall be included in all
14  copies or substantial portions of the Software.
15 
16  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22  SOFTWARE.
23 */
24 
25 /*
26  * @file ssd1306_hal/linux/io.h SSD1306 LINUX IO communication functions
27  */
28 
29 #ifndef _SSD1306_LINUX_IO_H_
30 #define _SSD1306_LINUX_IO_H_
31 
32 #define SSD1306_LINUX_SUPPORTED
33 
34 #if defined(SDL_EMULATION) // SDL Emulation mode includes
35 #include "sdl_core.h"
36 #endif
37 
38 #if defined(__KERNEL__) // KERNEL includes
39 #include <linux/types.h>
40 
41 #else // LINUX includes
42 
43 #include <stdint.h>
44 #include <unistd.h>
45 #include <time.h>
46 #include <string.h>
47 #endif
48 
50 #define LOW 0
51 #define HIGH 1
52 #define INPUT 1
53 #define OUTPUT 0
54 
55 #define PROGMEM
56 
57 #ifdef __cplusplus
58 extern "C" {
59 #endif
60 
61 static inline int digitalRead(int pin) { return LOW; };
62 #if defined(__KERNEL__) // ============== KERNEL
63 static inline void delay(unsigned long ms) { };
64 static inline void delayMicroseconds(unsigned long us) { };
65 static inline int analogRead(int pin) { return 0; };
66 static inline void digitalWrite(int pin, int level) { };
67 static inline uint32_t millis(void) { return 0; };
68 static inline uint32_t micros(void) { return 0; };
69 static inline void pinMode(int pin, int mode) {};
70 
71 #else // ============== LINUX
72 static inline void delay(unsigned long ms) { usleep(ms*1000); };
73 static inline void delayMicroseconds(unsigned long us) { usleep(us); };
74 static inline uint32_t millis(void)
75 {
76  struct timespec ts;
77  clock_gettime(CLOCK_MONOTONIC, &ts);
78  return ts.tv_sec * 1000 + ts.tv_nsec / 1000000;
79 };
80 
81 static inline uint32_t micros(void)
82 {
83  struct timespec ts;
84  clock_gettime(CLOCK_MONOTONIC, &ts);
85  return ts.tv_sec * 1000000 + ts.tv_nsec / 1000;
86 };
87 
88 /* For some reason defines do not work accross the libraries *
89  * Didn't yet figure out, what is the reason fo this issue */
90 //define min(a,b) (((a)<(b))?(a):(b))
91 //define max(a,b) (((a)>(b))?(a):(b))
92 static inline int min(int a, int b) { return a<b?a:b; };
93 static inline int max(int a, int b) { return a>b?a:b; };
94 #if !defined(SDL_EMULATION)
95 void pinMode(int pin, int mode);
96 #endif
97 
98 #endif
99 
100 #if defined(SDL_EMULATION)
101 static inline int analogRead(int pin) { return sdl_read_analog(pin); };
102 static inline void digitalWrite(int pin, int level) { sdl_write_digital(pin, level); };
103 static inline void pinMode(int pin, int mode) { };
104 #elif !defined(__KERNEL__)
105 static inline int analogRead(int pin) { return 0; };
106 void digitalWrite(int pin, int level);
107 #endif
108 
109 static inline void randomSeed(int seed) { };
110 static inline void attachInterrupt(int pin, void (*interrupt)(void), int level) { };
111 static inline uint8_t pgm_read_byte(const void *ptr) { return *((const uint8_t *)ptr); };
112 static inline uint16_t eeprom_read_word(const void *ptr) { return 0; };
113 static inline void eeprom_write_word(const void *ptr, uint16_t val) { };
114 
115 static inline char *utoa(unsigned int num, char *str, int radix)
116 {
117  char temp[17]; //an int can only be 16 bits long
118  //at radix 2 (binary) the string
119  //is at most 16 + 1 null long.
120  int temp_loc = 0;
121  int digit;
122  int str_loc = 0;
123 
124  //construct a backward string of the number.
125  do {
126  digit = (unsigned int)num % radix;
127  if (digit < 10)
128  temp[temp_loc++] = digit + '0';
129  else
130  temp[temp_loc++] = digit - 10 + 'A';
131  num = ((unsigned int)num) / radix;
132  } while ((unsigned int)num > 0);
133 
134  temp_loc--;
135 
136 
137  //now reverse the string.
138  while ( temp_loc >=0 ) {// while there are still chars
139  str[str_loc++] = temp[temp_loc--];
140  }
141  str[str_loc] = 0; // add null termination.
142 
143  return str;
144 }
145 
146 #ifdef __cplusplus
147 }
148 #endif
149 
150 #ifdef __cplusplus
151 #include <cstdlib>
152 static inline long random(long v)
153 {
154  return rand() % v;
155 }
156 
157 static inline long random(long min, long max)
158 {
159  return rand() % (max - min + 1) + min;
160 }
161 #endif
162 
163 #endif
164 
#define max(a, b)
#define min(a, b)