Jonne Valola / PokittoLib Featured

PokittoLib is the library needed for programming the Pokitto DIY game console (www.pokitto.com)

Dependents:   YATTT sd_map_test cPong SnowDemo ... more

PokittoLib

Library for programming Pokitto hardware

How to Use

  1. Import this library to online compiler (see button "import" on the right hand side
  2. DO NOT import mbed-src anymore, a better version is now included inside PokittoLib
  3. Change My_settings.h according to your project
  4. Start coding!

POKITTO_HW/SoftwareI2C.h@28:958b71c4b92a, 2018-01-05 (annotated)

Committer:
Pokitto
Date:
Fri Jan 05 02:19:51 2018 +0000
Revision:
28:958b71c4b92a
Parent:
0:e8b8f36b4505 
Sound level stored in EEPROM, sound output improved

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Pokitto 0:e8b8f36b4505 1 /*
Pokitto 0:e8b8f36b4505 2 * mbed Library to use a software master i2c interface on any GPIO pins
Pokitto 0:e8b8f36b4505 3 * Copyright (c) 2012 Christopher Pepper
Pokitto 0:e8b8f36b4505 4 * Released under the MIT License: http://mbed.org/license/mit
Pokitto 0:e8b8f36b4505 5 */
Pokitto 0:e8b8f36b4505 6
Pokitto 0:e8b8f36b4505 7 #ifndef _SOFTWARE_I2C_H_
Pokitto 0:e8b8f36b4505 8 #define _SOFTWARE_I2C_H_
Pokitto 0:e8b8f36b4505 9
Pokitto 0:e8b8f36b4505 10 #include "mbed.h"
Pokitto 0:e8b8f36b4505 11
Pokitto 0:e8b8f36b4505 12 /**
Pokitto 0:e8b8f36b4505 13 * @brief SoftwareI2C class
Pokitto 0:e8b8f36b4505 14 */
Pokitto 0:e8b8f36b4505 15
Pokitto 0:e8b8f36b4505 16 class SoftwareI2C {
Pokitto 0:e8b8f36b4505 17 public:
Pokitto 0:e8b8f36b4505 18 SoftwareI2C(PinName sda, PinName scl);
Pokitto 0:e8b8f36b4505 19 ~SoftwareI2C();
Pokitto 0:e8b8f36b4505 20
Pokitto 0:e8b8f36b4505 21 void read(uint8_t device_address, uint8_t* data, uint8_t data_bytes);
Pokitto 0:e8b8f36b4505 22 void write(uint8_t device_address, uint8_t* data, uint8_t data_bytes);
Pokitto 0:e8b8f36b4505 23 void write(uint8_t device_address, uint8_t byte);
Pokitto 0:e8b8f36b4505 24 void randomRead(uint8_t device_address, uint8_t start_address, uint8_t* data, uint8_t data_bytes);
Pokitto 0:e8b8f36b4505 25 void randomWrite(uint8_t device_address, uint8_t start_address, uint8_t* data, uint8_t data_bytes);
Pokitto 0:e8b8f36b4505 26 void randomWrite(uint8_t device_address, uint8_t start_address, uint8_t byte);
Pokitto 0:e8b8f36b4505 27
Pokitto 0:e8b8f36b4505 28 uint8_t read8(uint8_t device_address, uint8_t start_address);
Pokitto 0:e8b8f36b4505 29 uint16_t read16(uint8_t device_address, uint8_t start_address);
Pokitto 0:e8b8f36b4505 30 uint32_t read24(uint8_t device_address, uint8_t start_address);
Pokitto 0:e8b8f36b4505 31 uint32_t read32(uint8_t device_address, uint8_t start_address);
Pokitto 0:e8b8f36b4505 32
Pokitto 0:e8b8f36b4505 33 void setDeviceAddress(uint8_t address){
Pokitto 0:e8b8f36b4505 34 _device_address = address;
Pokitto 0:e8b8f36b4505 35 }
Pokitto 0:e8b8f36b4505 36
Pokitto 0:e8b8f36b4505 37 void setFrequency(uint32_t frequency){
Pokitto 0:e8b8f36b4505 38 _frequency_delay = 1000000 / frequency;
Pokitto 0:e8b8f36b4505 39 }
Pokitto 0:e8b8f36b4505 40
Pokitto 0:e8b8f36b4505 41 inline void initialise() {
Pokitto 0:e8b8f36b4505 42 _scl.output();
Pokitto 0:e8b8f36b4505 43 _sda.output();
Pokitto 0:e8b8f36b4505 44
Pokitto 0:e8b8f36b4505 45 _sda = 1;
Pokitto 0:e8b8f36b4505 46 _scl = 0;
Pokitto 0:e8b8f36b4505 47 wait_us(_frequency_delay);
Pokitto 0:e8b8f36b4505 48
Pokitto 0:e8b8f36b4505 49 for ( int n = 0; n <= 3; ++n ) {
Pokitto 0:e8b8f36b4505 50 stop();
Pokitto 0:e8b8f36b4505 51 }
Pokitto 0:e8b8f36b4505 52 }
Pokitto 0:e8b8f36b4505 53
Pokitto 0:e8b8f36b4505 54 private:
Pokitto 0:e8b8f36b4505 55 inline void start() {
Pokitto 0:e8b8f36b4505 56 _sda.output();
Pokitto 0:e8b8f36b4505 57 wait_us(_frequency_delay);
Pokitto 0:e8b8f36b4505 58 _scl = 1;
Pokitto 0:e8b8f36b4505 59 _sda = 1;
Pokitto 0:e8b8f36b4505 60 wait_us(_frequency_delay);
Pokitto 0:e8b8f36b4505 61 _sda = 0;
Pokitto 0:e8b8f36b4505 62 wait_us(_frequency_delay);
Pokitto 0:e8b8f36b4505 63 _scl = 0;
Pokitto 0:e8b8f36b4505 64 wait_us(_frequency_delay);
Pokitto 0:e8b8f36b4505 65 }
Pokitto 0:e8b8f36b4505 66
Pokitto 0:e8b8f36b4505 67 inline void stop() {
Pokitto 0:e8b8f36b4505 68 _sda.output();
Pokitto 0:e8b8f36b4505 69 wait_us(_frequency_delay);
Pokitto 0:e8b8f36b4505 70 _sda = 0;
Pokitto 0:e8b8f36b4505 71 wait_us(_frequency_delay);
Pokitto 0:e8b8f36b4505 72 _scl = 1;
Pokitto 0:e8b8f36b4505 73 wait_us(_frequency_delay);
Pokitto 0:e8b8f36b4505 74 _sda = 1;
Pokitto 0:e8b8f36b4505 75 }
Pokitto 0:e8b8f36b4505 76
Pokitto 0:e8b8f36b4505 77 inline void putByte(uint8_t byte) {
Pokitto 0:e8b8f36b4505 78 _sda.output();
Pokitto 0:e8b8f36b4505 79 for ( int n = 8; n > 0; --n) {
Pokitto 0:e8b8f36b4505 80 wait_us(_frequency_delay);
Pokitto 0:e8b8f36b4505 81 _sda = byte & (1 << (n-1));
Pokitto 0:e8b8f36b4505 82 _scl = 1;
Pokitto 0:e8b8f36b4505 83 wait_us(_frequency_delay);
Pokitto 0:e8b8f36b4505 84 _scl = 0;
Pokitto 0:e8b8f36b4505 85 }
Pokitto 0:e8b8f36b4505 86 _sda = 1;
Pokitto 0:e8b8f36b4505 87 }
Pokitto 0:e8b8f36b4505 88
Pokitto 0:e8b8f36b4505 89 inline uint8_t getByte() {
Pokitto 0:e8b8f36b4505 90 uint8_t byte = 0;
Pokitto 0:e8b8f36b4505 91
Pokitto 0:e8b8f36b4505 92 _sda.input(); //release the data line
Pokitto 0:e8b8f36b4505 93 _sda.mode(OpenDrain);
Pokitto 0:e8b8f36b4505 94
Pokitto 0:e8b8f36b4505 95 wait_us(_frequency_delay);
Pokitto 0:e8b8f36b4505 96
Pokitto 0:e8b8f36b4505 97 for ( int n = 8; n > 0; --n ) {
Pokitto 0:e8b8f36b4505 98 _scl=1; //set clock high
Pokitto 0:e8b8f36b4505 99 wait_us(_frequency_delay);
Pokitto 0:e8b8f36b4505 100 byte |= _sda << (n-1); //read the bit
Pokitto 0:e8b8f36b4505 101 wait_us(_frequency_delay);
Pokitto 0:e8b8f36b4505 102 _scl=0; //set clock low
Pokitto 0:e8b8f36b4505 103 wait_us(_frequency_delay);
Pokitto 0:e8b8f36b4505 104 }
Pokitto 0:e8b8f36b4505 105
Pokitto 0:e8b8f36b4505 106 _sda.output(); //take data line back
Pokitto 0:e8b8f36b4505 107
Pokitto 0:e8b8f36b4505 108 return byte;
Pokitto 0:e8b8f36b4505 109 }
Pokitto 0:e8b8f36b4505 110
Pokitto 0:e8b8f36b4505 111 inline void giveAck() {
Pokitto 0:e8b8f36b4505 112 _sda.output();
Pokitto 0:e8b8f36b4505 113 wait_us(_frequency_delay);
Pokitto 0:e8b8f36b4505 114 _sda = 0;
Pokitto 0:e8b8f36b4505 115 _scl = 1;
Pokitto 0:e8b8f36b4505 116 wait_us(_frequency_delay);
Pokitto 0:e8b8f36b4505 117 _scl = 0;
Pokitto 0:e8b8f36b4505 118 _sda = 1;
Pokitto 0:e8b8f36b4505 119
Pokitto 0:e8b8f36b4505 120 }
Pokitto 0:e8b8f36b4505 121
Pokitto 0:e8b8f36b4505 122 inline bool getAck() {
Pokitto 0:e8b8f36b4505 123 _sda.output();
Pokitto 0:e8b8f36b4505 124 _sda = 1;
Pokitto 0:e8b8f36b4505 125 _scl = 1;
Pokitto 0:e8b8f36b4505 126 _sda.input();
Pokitto 0:e8b8f36b4505 127 _sda.mode(OpenDrain);
Pokitto 0:e8b8f36b4505 128 wait_us(_frequency_delay);
Pokitto 0:e8b8f36b4505 129 _scl = 0;
Pokitto 0:e8b8f36b4505 130
Pokitto 0:e8b8f36b4505 131 if(_sda != 0){return false;}
Pokitto 0:e8b8f36b4505 132
Pokitto 0:e8b8f36b4505 133 wait_us(_frequency_delay);
Pokitto 0:e8b8f36b4505 134 return true;
Pokitto 0:e8b8f36b4505 135 }
Pokitto 0:e8b8f36b4505 136
Pokitto 0:e8b8f36b4505 137 DigitalInOut _sda;
Pokitto 0:e8b8f36b4505 138 DigitalInOut _scl;
Pokitto 0:e8b8f36b4505 139
Pokitto 0:e8b8f36b4505 140 uint8_t _device_address;
Pokitto 0:e8b8f36b4505 141 uint32_t _frequency_delay;
Pokitto 0:e8b8f36b4505 142 };
Pokitto 0:e8b8f36b4505 143
Pokitto 0:e8b8f36b4505 144 #endif
Pokitto 0:e8b8f36b4505 145