Lehrer Busch / LCD_i2C_JDS

I2C-LC-Diaplsay mit PCF8574

Dependents:   120_robot_H_Bridge8835_UserButton_DIR_PWM_I2C_LCD 140_robot_H_Bridge8835_DIR_PWM_US_LCD xxx_Uhr_I2C_LCD_Delay_Bua xxx_Uhr_I2C_LCD_Delay_BuaV ... more

SoftwareI2C.cpp@0:43e25c35d0c1, 2020-11-29 (annotated)

Committer:
itbusch
Date:
Sun Nov 29 10:10:28 2020 +0000
Revision:
0:43e25c35d0c1
I2C Library PCF8574 JDS

Who changed what in which revision?

UserRevisionLine numberNew contents of line
itbusch 0:43e25c35d0c1 1 /*
itbusch 0:43e25c35d0c1 2 * mbed Library to use a software master i2c interface on any GPIO pins
itbusch 0:43e25c35d0c1 3 * Copyright (c) 2012 Christopher Pepper
itbusch 0:43e25c35d0c1 4 * Released under the MIT License: http://mbed.org/license/mit
itbusch 0:43e25c35d0c1 5 */
itbusch 0:43e25c35d0c1 6
itbusch 0:43e25c35d0c1 7 #include "SoftwareI2C.h"
itbusch 0:43e25c35d0c1 8
itbusch 0:43e25c35d0c1 9 /**
itbusch 0:43e25c35d0c1 10 * @brief Initializes interface
itbusch 0:43e25c35d0c1 11 * @param sda GPIO pin to use as I2C SDA
itbusch 0:43e25c35d0c1 12 * @param scl GPIO pin to use as I2C SCL
itbusch 0:43e25c35d0c1 13 */
itbusch 0:43e25c35d0c1 14
itbusch 0:43e25c35d0c1 15 SoftwareI2C::SoftwareI2C(PinName sda, PinName scl) : _sda(sda) , _scl(scl) {
itbusch 0:43e25c35d0c1 16 _scl.output();
itbusch 0:43e25c35d0c1 17 _scl.mode(OpenDrain);
itbusch 0:43e25c35d0c1 18 _sda.output();
itbusch 0:43e25c35d0c1 19 _sda.mode(OpenDrain);
itbusch 0:43e25c35d0c1 20
itbusch 0:43e25c35d0c1 21 _device_address = 0;
itbusch 0:43e25c35d0c1 22 _frequency_delay = 20;//3;
itbusch 0:43e25c35d0c1 23
itbusch 0:43e25c35d0c1 24 initialise();
itbusch 0:43e25c35d0c1 25 }
itbusch 0:43e25c35d0c1 26
itbusch 0:43e25c35d0c1 27 SoftwareI2C::~SoftwareI2C() {
itbusch 0:43e25c35d0c1 28
itbusch 0:43e25c35d0c1 29 }
itbusch 0:43e25c35d0c1 30
itbusch 0:43e25c35d0c1 31 /**
itbusch 0:43e25c35d0c1 32 * @brief Read 1 or more bytes from the I2C slave
itbusch 0:43e25c35d0c1 33 * @param device_address The address of the device to read from
itbusch 0:43e25c35d0c1 34 * @param data An allocated array to read the data into
itbusch 0:43e25c35d0c1 35 * @param data_bytes Number of bytes to read (must be equal to or less then the allocated memory in data)
itbusch 0:43e25c35d0c1 36 */
itbusch 0:43e25c35d0c1 37 void SoftwareI2C::read(uint8_t device_address, uint8_t* data, uint8_t data_bytes) {
itbusch 0:43e25c35d0c1 38 if (data == 0 || data_bytes == 0) return;
itbusch 0:43e25c35d0c1 39 __disable_irq();
itbusch 0:43e25c35d0c1 40 device_address = device_address | 0x01;
itbusch 0:43e25c35d0c1 41 start();
itbusch 0:43e25c35d0c1 42 putByte(device_address);
itbusch 0:43e25c35d0c1 43 getAck();
itbusch 0:43e25c35d0c1 44 for (int x = 0; x < data_bytes; ++x) {
itbusch 0:43e25c35d0c1 45 data[x] = getByte();
itbusch 0:43e25c35d0c1 46 if ( x < (data_bytes -1)) { //ack all but the final byte
itbusch 0:43e25c35d0c1 47 giveAck();
itbusch 0:43e25c35d0c1 48 }
itbusch 0:43e25c35d0c1 49 }
itbusch 0:43e25c35d0c1 50 stop();
itbusch 0:43e25c35d0c1 51 __enable_irq();
itbusch 0:43e25c35d0c1 52 }
itbusch 0:43e25c35d0c1 53
itbusch 0:43e25c35d0c1 54 /**
itbusch 0:43e25c35d0c1 55 * @brief Write 1 or more bytes to the I2C slave
itbusch 0:43e25c35d0c1 56 * @param device_address The address of the device to write to
itbusch 0:43e25c35d0c1 57 * @param data An array to write the data from
itbusch 0:43e25c35d0c1 58 * @param data_bytes Number of bytes to write from array
itbusch 0:43e25c35d0c1 59 */
itbusch 0:43e25c35d0c1 60 void SoftwareI2C::write(uint8_t device_address, uint8_t* data, uint8_t data_bytes) {
itbusch 0:43e25c35d0c1 61 if (data == 0 || data_bytes == 0) return;
itbusch 0:43e25c35d0c1 62 __disable_irq();
itbusch 0:43e25c35d0c1 63 device_address = device_address & 0xFE;
itbusch 0:43e25c35d0c1 64 start();
itbusch 0:43e25c35d0c1 65 putByte(device_address);
itbusch 0:43e25c35d0c1 66 getAck();
itbusch 0:43e25c35d0c1 67 for ( int x = 0; x < data_bytes; ++x ) {
itbusch 0:43e25c35d0c1 68 putByte(data[x]);
itbusch 0:43e25c35d0c1 69 getAck();
itbusch 0:43e25c35d0c1 70 }
itbusch 0:43e25c35d0c1 71 stop();
itbusch 0:43e25c35d0c1 72 __enable_irq();
itbusch 0:43e25c35d0c1 73 }
itbusch 0:43e25c35d0c1 74
itbusch 0:43e25c35d0c1 75 /**
itbusch 0:43e25c35d0c1 76 * @brief Write 1 byte to the I2C slave
itbusch 0:43e25c35d0c1 77 * @param device_address The address of the device to write to
itbusch 0:43e25c35d0c1 78 * @param byte The data to write
itbusch 0:43e25c35d0c1 79 */
itbusch 0:43e25c35d0c1 80 void SoftwareI2C::write(uint8_t device_address, uint8_t byte) {
itbusch 0:43e25c35d0c1 81 device_address = device_address & 0xFE;
itbusch 0:43e25c35d0c1 82 start();
itbusch 0:43e25c35d0c1 83 putByte(device_address);
itbusch 0:43e25c35d0c1 84 getAck();
itbusch 0:43e25c35d0c1 85 putByte(byte);
itbusch 0:43e25c35d0c1 86 getAck();
itbusch 0:43e25c35d0c1 87 stop();
itbusch 0:43e25c35d0c1 88 }
itbusch 0:43e25c35d0c1 89
itbusch 0:43e25c35d0c1 90 /**
itbusch 0:43e25c35d0c1 91 * @brief Read 1 or more bytes from the I2C slave at the specified memory address
itbusch 0:43e25c35d0c1 92 * @param device_address The address of the device to read from
itbusch 0:43e25c35d0c1 93 * @param start_address The memory address to read from
itbusch 0:43e25c35d0c1 94 * @param data The allocated array to read into
itbusch 0:43e25c35d0c1 95 * @param data_bytes The number of bytes to read
itbusch 0:43e25c35d0c1 96 */
itbusch 0:43e25c35d0c1 97 void SoftwareI2C::randomRead(uint8_t device_address, uint8_t start_address, uint8_t* data, uint8_t data_bytes) {
itbusch 0:43e25c35d0c1 98 if (data == 0 || data_bytes == 0) return;
itbusch 0:43e25c35d0c1 99
itbusch 0:43e25c35d0c1 100 device_address = device_address & 0xFE;
itbusch 0:43e25c35d0c1 101 start();
itbusch 0:43e25c35d0c1 102 putByte(device_address);
itbusch 0:43e25c35d0c1 103 if (!getAck()) {
itbusch 0:43e25c35d0c1 104 return;
itbusch 0:43e25c35d0c1 105 }
itbusch 0:43e25c35d0c1 106 putByte(start_address);
itbusch 0:43e25c35d0c1 107 if (!getAck()) {
itbusch 0:43e25c35d0c1 108 return;
itbusch 0:43e25c35d0c1 109 }
itbusch 0:43e25c35d0c1 110
itbusch 0:43e25c35d0c1 111 device_address=device_address | 0x01;
itbusch 0:43e25c35d0c1 112 start();
itbusch 0:43e25c35d0c1 113 putByte(device_address);
itbusch 0:43e25c35d0c1 114 if (!getAck()) {
itbusch 0:43e25c35d0c1 115 return;
itbusch 0:43e25c35d0c1 116 }
itbusch 0:43e25c35d0c1 117 for ( int x = 0; x < data_bytes; ++x) {
itbusch 0:43e25c35d0c1 118 data[x] = getByte();
itbusch 0:43e25c35d0c1 119 if (x != (data_bytes - 1)) giveAck();
itbusch 0:43e25c35d0c1 120 }
itbusch 0:43e25c35d0c1 121 stop();
itbusch 0:43e25c35d0c1 122 }
itbusch 0:43e25c35d0c1 123
itbusch 0:43e25c35d0c1 124 /**
itbusch 0:43e25c35d0c1 125 * @brief Write 1 byte to the I2C slave at the specified memory address
itbusch 0:43e25c35d0c1 126 * @param device_address The address of the device to write to
itbusch 0:43e25c35d0c1 127 * @param start_address The memory address to write to
itbusch 0:43e25c35d0c1 128 * @param byte The data to write
itbusch 0:43e25c35d0c1 129 */
itbusch 0:43e25c35d0c1 130 void SoftwareI2C::randomWrite(uint8_t device_address, uint8_t start_address, uint8_t byte) {
itbusch 0:43e25c35d0c1 131 device_address = device_address & 0xFE;
itbusch 0:43e25c35d0c1 132 start();
itbusch 0:43e25c35d0c1 133 putByte(device_address);
itbusch 0:43e25c35d0c1 134 getAck();
itbusch 0:43e25c35d0c1 135 putByte(start_address);
itbusch 0:43e25c35d0c1 136 getAck();
itbusch 0:43e25c35d0c1 137 putByte(byte);
itbusch 0:43e25c35d0c1 138 getAck();
itbusch 0:43e25c35d0c1 139 stop();
itbusch 0:43e25c35d0c1 140 }
itbusch 0:43e25c35d0c1 141
itbusch 0:43e25c35d0c1 142 /**
itbusch 0:43e25c35d0c1 143 * @brief Write 1 or more bytes to the I2C slave at the specified memory address
itbusch 0:43e25c35d0c1 144 * @param device_address The address of the device to write to
itbusch 0:43e25c35d0c1 145 * @param start_address The memory address to write to
itbusch 0:43e25c35d0c1 146 * @param data The data to write
itbusch 0:43e25c35d0c1 147 * @param data_bytes The number of bytes to write
itbusch 0:43e25c35d0c1 148 */
itbusch 0:43e25c35d0c1 149 void SoftwareI2C::randomWrite(uint8_t device_address, uint8_t start_address, uint8_t* data, uint8_t data_bytes) {
itbusch 0:43e25c35d0c1 150 if (data == 0 || data_bytes == 0) return;
itbusch 0:43e25c35d0c1 151
itbusch 0:43e25c35d0c1 152 device_address = device_address & 0xFE;
itbusch 0:43e25c35d0c1 153 start();
itbusch 0:43e25c35d0c1 154 putByte(device_address);
itbusch 0:43e25c35d0c1 155 getAck();
itbusch 0:43e25c35d0c1 156 putByte(start_address);
itbusch 0:43e25c35d0c1 157 getAck();
itbusch 0:43e25c35d0c1 158 for ( int x = 0; x <= data_bytes; ++x ) {
itbusch 0:43e25c35d0c1 159 putByte(data[x]);
itbusch 0:43e25c35d0c1 160 getAck();
itbusch 0:43e25c35d0c1 161 }
itbusch 0:43e25c35d0c1 162 stop();
itbusch 0:43e25c35d0c1 163 }
itbusch 0:43e25c35d0c1 164
itbusch 0:43e25c35d0c1 165 /**
itbusch 0:43e25c35d0c1 166 * @brief Read 2 bytes from the I2C slave at the specified memory address and return them as an 16bit unsigned integer
itbusch 0:43e25c35d0c1 167 * @param device_address The address of the device to read from
itbusch 0:43e25c35d0c1 168 * @param start_address The memory address to read from
itbusch 0:43e25c35d0c1 169 * @return MSB 16bit unsigned integer
itbusch 0:43e25c35d0c1 170 */
itbusch 0:43e25c35d0c1 171 uint16_t SoftwareI2C::read16(uint8_t device_address, uint8_t start_address) {
itbusch 0:43e25c35d0c1 172 uint8_t short_array[2] = {0, 0};
itbusch 0:43e25c35d0c1 173 randomRead(device_address, start_address, short_array, 2 );
itbusch 0:43e25c35d0c1 174 uint16_t value = 0;
itbusch 0:43e25c35d0c1 175 value = short_array[0] << 8;
itbusch 0:43e25c35d0c1 176 value |= short_array[1];
itbusch 0:43e25c35d0c1 177
itbusch 0:43e25c35d0c1 178 return value;
itbusch 0:43e25c35d0c1 179 }
itbusch 0:43e25c35d0c1 180
itbusch 0:43e25c35d0c1 181 /**
itbusch 0:43e25c35d0c1 182 * @brief Read 3 bytes from the I2C slave at the specified memory address and return them as an 32bit unsigned integer
itbusch 0:43e25c35d0c1 183 * @param device_address The address of the device to read from
itbusch 0:43e25c35d0c1 184 * @param start_address The memory address to read from
itbusch 0:43e25c35d0c1 185 * @return MSB 32bit unsigned integer
itbusch 0:43e25c35d0c1 186 */
itbusch 0:43e25c35d0c1 187 uint32_t SoftwareI2C::read24(uint8_t device_address, uint8_t start_address) {
itbusch 0:43e25c35d0c1 188 uint8_t value_array[4] = {0, 0, 0};
itbusch 0:43e25c35d0c1 189 randomRead(device_address, start_address, value_array, 3 );
itbusch 0:43e25c35d0c1 190 uint32_t value = 0;
itbusch 0:43e25c35d0c1 191 value = value_array[0] << 16;
itbusch 0:43e25c35d0c1 192 value |= value_array[1] << 8;
itbusch 0:43e25c35d0c1 193 value |= value_array[2];
itbusch 0:43e25c35d0c1 194
itbusch 0:43e25c35d0c1 195 return value;
itbusch 0:43e25c35d0c1 196 }
itbusch 0:43e25c35d0c1 197
itbusch 0:43e25c35d0c1 198 /**
itbusch 0:43e25c35d0c1 199 * @brief Read 4 bytes from the I2C slave at the specified memory address and return them as an 32bit unsigned integer
itbusch 0:43e25c35d0c1 200 * @param device_address The address of the device to read from
itbusch 0:43e25c35d0c1 201 * @param start_address The memory address to read from
itbusch 0:43e25c35d0c1 202 * @return MSB 32bit unsigned integer
itbusch 0:43e25c35d0c1 203 */
itbusch 0:43e25c35d0c1 204 uint32_t SoftwareI2C::read32(uint8_t device_address, uint8_t start_address) {
itbusch 0:43e25c35d0c1 205 uint8_t value_array[4] = {0, 0, 0, 0};
itbusch 0:43e25c35d0c1 206 randomRead(device_address, start_address, value_array, 4 );
itbusch 0:43e25c35d0c1 207 uint32_t value = 0;
itbusch 0:43e25c35d0c1 208 value = value_array[0] << 24;
itbusch 0:43e25c35d0c1 209 value |= value_array[1] << 16;
itbusch 0:43e25c35d0c1 210 value |= value_array[2] << 8;
itbusch 0:43e25c35d0c1 211 value |= value_array[3];
itbusch 0:43e25c35d0c1 212
itbusch 0:43e25c35d0c1 213 return value;
itbusch 0:43e25c35d0c1 214 }