Yuichi Tateno / Max7219

Max7219 7seg LED library

Dependents:   Max7219_7segled_example Max7219_7LED_example

https://lh3.googleusercontent.com/-0vXfHJLi27Q/V-Y5ZtR0DwI/AAAAAAAAeY8/RazTbDF_u1o6rOeBhdWTyNvmOGqz_601wCKgB/s1024/IMG_0852.JPG

- example: https://developer.mbed.org/users/hotchpotch/code/Max7219_7segled_example/

Max7219.hpp@1:367abb8e4cfc, 2016-09-24 (annotated)

Committer:
hotchpotch
Date:
Sat Sep 24 08:21:50 2016 +0000
Revision:
1:367abb8e4cfc
Parent:
0:980df3fd4973 
Change licence

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hotchpotch 0:980df3fd4973 1 /*
hotchpotch 1:367abb8e4cfc 2 * Licence: Apache2 Licence
hotchpotch 0:980df3fd4973 3 * Author: Yuichi Tateno
hotchpotch 0:980df3fd4973 4 *
hotchpotch 0:980df3fd4973 5 * base code from https://lowreal.net/2016/03/18/1 <Author: cho45>
hotchpotch 0:980df3fd4973 6 */
hotchpotch 0:980df3fd4973 7
hotchpotch 0:980df3fd4973 8 #ifndef _MAX_7129_HPP
hotchpotch 0:980df3fd4973 9 #define _MAX_7129_HPP
hotchpotch 0:980df3fd4973 10
hotchpotch 0:980df3fd4973 11 #include <mbed.h>
hotchpotch 0:980df3fd4973 12
hotchpotch 0:980df3fd4973 13 class MAX7219 {
hotchpotch 0:980df3fd4973 14 SPI spi;
hotchpotch 0:980df3fd4973 15 DigitalOut cs;
hotchpotch 0:980df3fd4973 16
hotchpotch 0:980df3fd4973 17 public:
hotchpotch 0:980df3fd4973 18 typedef enum {
hotchpotch 0:980df3fd4973 19 NOOP = 0b0000,
hotchpotch 0:980df3fd4973 20 DIGIT0 = 1,
hotchpotch 0:980df3fd4973 21 DIGIT1 = 2,
hotchpotch 0:980df3fd4973 22 DIGIT2 = 3,
hotchpotch 0:980df3fd4973 23 DIGIT3 = 4,
hotchpotch 0:980df3fd4973 24 DIGIT4 = 5,
hotchpotch 0:980df3fd4973 25 DIGIT5 = 6,
hotchpotch 0:980df3fd4973 26 DIGIT6 = 7,
hotchpotch 0:980df3fd4973 27 DIGIT7 = 8,
hotchpotch 0:980df3fd4973 28 DECODE_MODE = 0b1001,
hotchpotch 0:980df3fd4973 29 INTENSITY = 0b1010,
hotchpotch 0:980df3fd4973 30 SCAN_LIMIT = 0b1011,
hotchpotch 0:980df3fd4973 31 SHUTDOWN = 0b1100,
hotchpotch 0:980df3fd4973 32 DISPLAY_TEST = 0b1111,
hotchpotch 0:980df3fd4973 33 } ADDRESS;
hotchpotch 0:980df3fd4973 34
hotchpotch 0:980df3fd4973 35 typedef enum {
hotchpotch 0:980df3fd4973 36 SHUTDOWN_MODE_SHUTDOWN = 0b0,
hotchpotch 0:980df3fd4973 37 SHUTDOWN_MODE_NORMAL = 0b1,
hotchpotch 0:980df3fd4973 38 } SHUTDOWN_MODE;
hotchpotch 0:980df3fd4973 39
hotchpotch 0:980df3fd4973 40 typedef enum {
hotchpotch 0:980df3fd4973 41 NO_DECODE_FOR_DIGITS_7_0 = 0b00000000,
hotchpotch 0:980df3fd4973 42 CODE_B_DECODE_FOR_DIGIT_0_NO_DECODE_FOR_DIGITS_7_1 = 0b00000001,
hotchpotch 0:980df3fd4973 43 CODE_B_DECODE_FOR_DIGIT_3_0_NO_DECODE_FOR_DIGITS_7_4 = 0b00001111,
hotchpotch 0:980df3fd4973 44 CODE_B_DECODE_FOR_DIGIT_7_0 = 0b11111111,
hotchpotch 0:980df3fd4973 45 } DECODE_MODE_TYPE;
hotchpotch 0:980df3fd4973 46
hotchpotch 0:980df3fd4973 47 MAX7219(SPI _spi, PinName _cs_pin) :
hotchpotch 0:980df3fd4973 48 spi(_spi), cs(_cs_pin, 0)
hotchpotch 0:980df3fd4973 49 {
hotchpotch 0:980df3fd4973 50 }
hotchpotch 0:980df3fd4973 51
hotchpotch 0:980df3fd4973 52 void write(uint8_t address, uint8_t data) {
hotchpotch 0:980df3fd4973 53 cs = 0;
hotchpotch 0:980df3fd4973 54 spi.write(address);
hotchpotch 0:980df3fd4973 55 spi.write(data);
hotchpotch 0:980df3fd4973 56 cs = 1;
hotchpotch 0:980df3fd4973 57 }
hotchpotch 0:980df3fd4973 58
hotchpotch 0:980df3fd4973 59 void begin() {
hotchpotch 0:980df3fd4973 60 setDecodeMode(CODE_B_DECODE_FOR_DIGIT_7_0);
hotchpotch 0:980df3fd4973 61 setScanLimit(7);
hotchpotch 0:980df3fd4973 62 setShutdown(false);
hotchpotch 0:980df3fd4973 63
hotchpotch 0:980df3fd4973 64 setIntensity(8);
hotchpotch 0:980df3fd4973 65
hotchpotch 0:980df3fd4973 66 for (uint8_t i = 0; i < 8; i++) {
hotchpotch 0:980df3fd4973 67 write(i + 1, 1);
hotchpotch 0:980df3fd4973 68 }
hotchpotch 0:980df3fd4973 69 }
hotchpotch 0:980df3fd4973 70
hotchpotch 0:980df3fd4973 71 void setDecodeMode(DECODE_MODE_TYPE mode) {
hotchpotch 0:980df3fd4973 72 write(DECODE_MODE, mode);
hotchpotch 0:980df3fd4973 73 }
hotchpotch 0:980df3fd4973 74
hotchpotch 0:980df3fd4973 75 void setScanLimit(uint8_t limit) {
hotchpotch 0:980df3fd4973 76 write(SCAN_LIMIT, limit);
hotchpotch 0:980df3fd4973 77 }
hotchpotch 0:980df3fd4973 78
hotchpotch 0:980df3fd4973 79 void setIntensity(uint8_t intensity) {
hotchpotch 0:980df3fd4973 80 write(INTENSITY, intensity);
hotchpotch 0:980df3fd4973 81 }
hotchpotch 0:980df3fd4973 82
hotchpotch 0:980df3fd4973 83 void setShutdown(bool shutdown) {
hotchpotch 0:980df3fd4973 84 write(SHUTDOWN, shutdown ? SHUTDOWN_MODE_SHUTDOWN : SHUTDOWN_MODE_NORMAL);
hotchpotch 0:980df3fd4973 85 }
hotchpotch 0:980df3fd4973 86
hotchpotch 0:980df3fd4973 87 void print(const char* buf) {
hotchpotch 0:980df3fd4973 88 size_t len = strlen(buf);
hotchpotch 0:980df3fd4973 89 uint8_t digit = 0, dp = 0;
hotchpotch 0:980df3fd4973 90 for (size_t i = 0; i < len && digit < 8; i++) {
hotchpotch 0:980df3fd4973 91 const char c = buf[len - i - 1];
hotchpotch 0:980df3fd4973 92 if (c == '.') {
hotchpotch 0:980df3fd4973 93 dp = 1<<7;
hotchpotch 0:980df3fd4973 94 continue;
hotchpotch 0:980df3fd4973 95 }
hotchpotch 0:980df3fd4973 96
hotchpotch 0:980df3fd4973 97 uint8_t b;
hotchpotch 0:980df3fd4973 98 if (c == '-') {
hotchpotch 0:980df3fd4973 99 b = 0b1010;
hotchpotch 0:980df3fd4973 100 } else
hotchpotch 0:980df3fd4973 101 if (c == ' ') {
hotchpotch 0:980df3fd4973 102 b = 0b1111;
hotchpotch 0:980df3fd4973 103 } else
hotchpotch 0:980df3fd4973 104 if ('0' <= c && c <= '9') {
hotchpotch 0:980df3fd4973 105 b = static_cast<uint8_t>(c - '0');
hotchpotch 0:980df3fd4973 106 } else {
hotchpotch 0:980df3fd4973 107 continue;
hotchpotch 0:980df3fd4973 108 }
hotchpotch 0:980df3fd4973 109
hotchpotch 0:980df3fd4973 110 write(digit + 1, b | dp);
hotchpotch 0:980df3fd4973 111 dp = 0;
hotchpotch 0:980df3fd4973 112 digit++;
hotchpotch 0:980df3fd4973 113 }
hotchpotch 0:980df3fd4973 114
hotchpotch 0:980df3fd4973 115 for (; digit < 8; digit++) {
hotchpotch 0:980df3fd4973 116 write(digit + 1, 0b1111);
hotchpotch 0:980df3fd4973 117 }
hotchpotch 0:980df3fd4973 118 }
hotchpotch 0:980df3fd4973 119 };
hotchpotch 0:980df3fd4973 120
hotchpotch 0:980df3fd4973 121
hotchpotch 0:980df3fd4973 122 #endif // _MAX_7129_HPP