Jack Hansdampf / LCD_i2c_GSOE_Schnaiter

LCD Baseshield GSOE GSOF

Dependents:   WebserverGSOE_Schnaiter HC05__TI4_RP5_Schnaiter

SoftwareI2C.cpp@12:05f13250c22d, 2021-08-18 (annotated)

Committer:
jack1930
Date:
Wed Aug 18 14:00:05 2021 +0000
Revision:
12:05f13250c22d
Parent:
9:b08c2ffb9253 
Anschluesse geaendert

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jack1930 5:66ca6c9b15f2 1 /*
jack1930 5:66ca6c9b15f2 2 * mbed Library to use a software master i2c interface on any GPIO pins
jack1930 5:66ca6c9b15f2 3 * Copyright (c) 2012 Christopher Pepper
jack1930 5:66ca6c9b15f2 4 * Released under the MIT License: http://mbed.org/license/mit
jack1930 5:66ca6c9b15f2 5 */
jack1930 5:66ca6c9b15f2 6
jack1930 5:66ca6c9b15f2 7 #include "SoftwareI2C.h"
jack1930 5:66ca6c9b15f2 8
jack1930 5:66ca6c9b15f2 9 /**
jack1930 5:66ca6c9b15f2 10 * @brief Initializes interface
jack1930 5:66ca6c9b15f2 11 * @param sda GPIO pin to use as I2C SDA
jack1930 5:66ca6c9b15f2 12 * @param scl GPIO pin to use as I2C SCL
jack1930 5:66ca6c9b15f2 13 */
jack1930 5:66ca6c9b15f2 14
jack1930 5:66ca6c9b15f2 15 SoftwareI2C::SoftwareI2C(PinName sda, PinName scl) : _sda(sda) , _scl(scl) {
jack1930 5:66ca6c9b15f2 16 _scl.output();
jack1930 5:66ca6c9b15f2 17 _scl.mode(OpenDrain);
jack1930 5:66ca6c9b15f2 18 _sda.output();
jack1930 5:66ca6c9b15f2 19 _sda.mode(OpenDrain);
jack1930 5:66ca6c9b15f2 20
jack1930 5:66ca6c9b15f2 21 _device_address = 0;
jack1930 9:b08c2ffb9253 22 if (HAL_GetDEVID () ==0x437) _frequency_delay = 20;//3;
jack1930 9:b08c2ffb9253 23 else _frequency_delay = 60;//3;
jack1930 5:66ca6c9b15f2 24
jack1930 5:66ca6c9b15f2 25 initialise();
jack1930 5:66ca6c9b15f2 26 }
jack1930 5:66ca6c9b15f2 27
jack1930 5:66ca6c9b15f2 28 SoftwareI2C::~SoftwareI2C() {
jack1930 5:66ca6c9b15f2 29
jack1930 5:66ca6c9b15f2 30 }
jack1930 5:66ca6c9b15f2 31
jack1930 5:66ca6c9b15f2 32 /**
jack1930 5:66ca6c9b15f2 33 * @brief Read 1 or more bytes from the I2C slave
jack1930 5:66ca6c9b15f2 34 * @param device_address The address of the device to read from
jack1930 5:66ca6c9b15f2 35 * @param data An allocated array to read the data into
jack1930 5:66ca6c9b15f2 36 * @param data_bytes Number of bytes to read (must be equal to or less then the allocated memory in data)
jack1930 5:66ca6c9b15f2 37 */
jack1930 5:66ca6c9b15f2 38 void SoftwareI2C::read(uint8_t device_address, uint8_t* data, uint8_t data_bytes) {
jack1930 5:66ca6c9b15f2 39 if (data == 0 || data_bytes == 0) return;
jack1930 7:c3d157395c16 40 __disable_irq();
jack1930 5:66ca6c9b15f2 41 device_address = device_address | 0x01;
jack1930 5:66ca6c9b15f2 42 start();
jack1930 5:66ca6c9b15f2 43 putByte(device_address);
jack1930 5:66ca6c9b15f2 44 getAck();
jack1930 5:66ca6c9b15f2 45 for (int x = 0; x < data_bytes; ++x) {
jack1930 5:66ca6c9b15f2 46 data[x] = getByte();
jack1930 5:66ca6c9b15f2 47 if ( x < (data_bytes -1)) { //ack all but the final byte
jack1930 5:66ca6c9b15f2 48 giveAck();
jack1930 5:66ca6c9b15f2 49 }
jack1930 5:66ca6c9b15f2 50 }
jack1930 5:66ca6c9b15f2 51 stop();
jack1930 7:c3d157395c16 52 __enable_irq();
jack1930 5:66ca6c9b15f2 53 }
jack1930 5:66ca6c9b15f2 54
jack1930 5:66ca6c9b15f2 55 /**
jack1930 5:66ca6c9b15f2 56 * @brief Write 1 or more bytes to the I2C slave
jack1930 5:66ca6c9b15f2 57 * @param device_address The address of the device to write to
jack1930 5:66ca6c9b15f2 58 * @param data An array to write the data from
jack1930 5:66ca6c9b15f2 59 * @param data_bytes Number of bytes to write from array
jack1930 5:66ca6c9b15f2 60 */
jack1930 5:66ca6c9b15f2 61 void SoftwareI2C::write(uint8_t device_address, uint8_t* data, uint8_t data_bytes) {
jack1930 5:66ca6c9b15f2 62 if (data == 0 || data_bytes == 0) return;
jack1930 7:c3d157395c16 63 __disable_irq();
jack1930 5:66ca6c9b15f2 64 device_address = device_address & 0xFE;
jack1930 5:66ca6c9b15f2 65 start();
jack1930 5:66ca6c9b15f2 66 putByte(device_address);
jack1930 5:66ca6c9b15f2 67 getAck();
jack1930 5:66ca6c9b15f2 68 for ( int x = 0; x < data_bytes; ++x ) {
jack1930 5:66ca6c9b15f2 69 putByte(data[x]);
jack1930 5:66ca6c9b15f2 70 getAck();
jack1930 5:66ca6c9b15f2 71 }
jack1930 5:66ca6c9b15f2 72 stop();
jack1930 7:c3d157395c16 73 __enable_irq();
jack1930 5:66ca6c9b15f2 74 }
jack1930 5:66ca6c9b15f2 75
jack1930 5:66ca6c9b15f2 76 /**
jack1930 5:66ca6c9b15f2 77 * @brief Write 1 byte to the I2C slave
jack1930 5:66ca6c9b15f2 78 * @param device_address The address of the device to write to
jack1930 5:66ca6c9b15f2 79 * @param byte The data to write
jack1930 5:66ca6c9b15f2 80 */
jack1930 5:66ca6c9b15f2 81 void SoftwareI2C::write(uint8_t device_address, uint8_t byte) {
jack1930 5:66ca6c9b15f2 82 device_address = device_address & 0xFE;
jack1930 5:66ca6c9b15f2 83 start();
jack1930 5:66ca6c9b15f2 84 putByte(device_address);
jack1930 5:66ca6c9b15f2 85 getAck();
jack1930 5:66ca6c9b15f2 86 putByte(byte);
jack1930 5:66ca6c9b15f2 87 getAck();
jack1930 5:66ca6c9b15f2 88 stop();
jack1930 5:66ca6c9b15f2 89 }
jack1930 5:66ca6c9b15f2 90
jack1930 5:66ca6c9b15f2 91 /**
jack1930 5:66ca6c9b15f2 92 * @brief Read 1 or more bytes from the I2C slave at the specified memory address
jack1930 5:66ca6c9b15f2 93 * @param device_address The address of the device to read from
jack1930 5:66ca6c9b15f2 94 * @param start_address The memory address to read from
jack1930 5:66ca6c9b15f2 95 * @param data The allocated array to read into
jack1930 5:66ca6c9b15f2 96 * @param data_bytes The number of bytes to read
jack1930 5:66ca6c9b15f2 97 */
jack1930 5:66ca6c9b15f2 98 void SoftwareI2C::randomRead(uint8_t device_address, uint8_t start_address, uint8_t* data, uint8_t data_bytes) {
jack1930 5:66ca6c9b15f2 99 if (data == 0 || data_bytes == 0) return;
jack1930 5:66ca6c9b15f2 100
jack1930 5:66ca6c9b15f2 101 device_address = device_address & 0xFE;
jack1930 5:66ca6c9b15f2 102 start();
jack1930 5:66ca6c9b15f2 103 putByte(device_address);
jack1930 5:66ca6c9b15f2 104 if (!getAck()) {
jack1930 5:66ca6c9b15f2 105 return;
jack1930 5:66ca6c9b15f2 106 }
jack1930 5:66ca6c9b15f2 107 putByte(start_address);
jack1930 5:66ca6c9b15f2 108 if (!getAck()) {
jack1930 5:66ca6c9b15f2 109 return;
jack1930 5:66ca6c9b15f2 110 }
jack1930 5:66ca6c9b15f2 111
jack1930 5:66ca6c9b15f2 112 device_address=device_address | 0x01;
jack1930 5:66ca6c9b15f2 113 start();
jack1930 5:66ca6c9b15f2 114 putByte(device_address);
jack1930 5:66ca6c9b15f2 115 if (!getAck()) {
jack1930 5:66ca6c9b15f2 116 return;
jack1930 5:66ca6c9b15f2 117 }
jack1930 5:66ca6c9b15f2 118 for ( int x = 0; x < data_bytes; ++x) {
jack1930 5:66ca6c9b15f2 119 data[x] = getByte();
jack1930 5:66ca6c9b15f2 120 if (x != (data_bytes - 1)) giveAck();
jack1930 5:66ca6c9b15f2 121 }
jack1930 5:66ca6c9b15f2 122 stop();
jack1930 5:66ca6c9b15f2 123 }
jack1930 5:66ca6c9b15f2 124
jack1930 5:66ca6c9b15f2 125 /**
jack1930 5:66ca6c9b15f2 126 * @brief Write 1 byte to the I2C slave at the specified memory address
jack1930 5:66ca6c9b15f2 127 * @param device_address The address of the device to write to
jack1930 5:66ca6c9b15f2 128 * @param start_address The memory address to write to
jack1930 5:66ca6c9b15f2 129 * @param byte The data to write
jack1930 5:66ca6c9b15f2 130 */
jack1930 5:66ca6c9b15f2 131 void SoftwareI2C::randomWrite(uint8_t device_address, uint8_t start_address, uint8_t byte) {
jack1930 5:66ca6c9b15f2 132 device_address = device_address & 0xFE;
jack1930 5:66ca6c9b15f2 133 start();
jack1930 5:66ca6c9b15f2 134 putByte(device_address);
jack1930 5:66ca6c9b15f2 135 getAck();
jack1930 5:66ca6c9b15f2 136 putByte(start_address);
jack1930 5:66ca6c9b15f2 137 getAck();
jack1930 5:66ca6c9b15f2 138 putByte(byte);
jack1930 5:66ca6c9b15f2 139 getAck();
jack1930 5:66ca6c9b15f2 140 stop();
jack1930 5:66ca6c9b15f2 141 }
jack1930 5:66ca6c9b15f2 142
jack1930 5:66ca6c9b15f2 143 /**
jack1930 5:66ca6c9b15f2 144 * @brief Write 1 or more bytes to the I2C slave at the specified memory address
jack1930 5:66ca6c9b15f2 145 * @param device_address The address of the device to write to
jack1930 5:66ca6c9b15f2 146 * @param start_address The memory address to write to
jack1930 5:66ca6c9b15f2 147 * @param data The data to write
jack1930 5:66ca6c9b15f2 148 * @param data_bytes The number of bytes to write
jack1930 5:66ca6c9b15f2 149 */
jack1930 5:66ca6c9b15f2 150 void SoftwareI2C::randomWrite(uint8_t device_address, uint8_t start_address, uint8_t* data, uint8_t data_bytes) {
jack1930 5:66ca6c9b15f2 151 if (data == 0 || data_bytes == 0) return;
jack1930 5:66ca6c9b15f2 152
jack1930 5:66ca6c9b15f2 153 device_address = device_address & 0xFE;
jack1930 5:66ca6c9b15f2 154 start();
jack1930 5:66ca6c9b15f2 155 putByte(device_address);
jack1930 5:66ca6c9b15f2 156 getAck();
jack1930 5:66ca6c9b15f2 157 putByte(start_address);
jack1930 5:66ca6c9b15f2 158 getAck();
jack1930 5:66ca6c9b15f2 159 for ( int x = 0; x <= data_bytes; ++x ) {
jack1930 5:66ca6c9b15f2 160 putByte(data[x]);
jack1930 5:66ca6c9b15f2 161 getAck();
jack1930 5:66ca6c9b15f2 162 }
jack1930 5:66ca6c9b15f2 163 stop();
jack1930 5:66ca6c9b15f2 164 }
jack1930 5:66ca6c9b15f2 165
jack1930 5:66ca6c9b15f2 166 /**
jack1930 5:66ca6c9b15f2 167 * @brief Read 2 bytes from the I2C slave at the specified memory address and return them as an 16bit unsigned integer
jack1930 5:66ca6c9b15f2 168 * @param device_address The address of the device to read from
jack1930 5:66ca6c9b15f2 169 * @param start_address The memory address to read from
jack1930 5:66ca6c9b15f2 170 * @return MSB 16bit unsigned integer
jack1930 5:66ca6c9b15f2 171 */
jack1930 5:66ca6c9b15f2 172 uint16_t SoftwareI2C::read16(uint8_t device_address, uint8_t start_address) {
jack1930 5:66ca6c9b15f2 173 uint8_t short_array[2] = {0, 0};
jack1930 5:66ca6c9b15f2 174 randomRead(device_address, start_address, short_array, 2 );
jack1930 5:66ca6c9b15f2 175 uint16_t value = 0;
jack1930 5:66ca6c9b15f2 176 value = short_array[0] << 8;
jack1930 5:66ca6c9b15f2 177 value |= short_array[1];
jack1930 5:66ca6c9b15f2 178
jack1930 5:66ca6c9b15f2 179 return value;
jack1930 5:66ca6c9b15f2 180 }
jack1930 5:66ca6c9b15f2 181
jack1930 5:66ca6c9b15f2 182 /**
jack1930 5:66ca6c9b15f2 183 * @brief Read 3 bytes from the I2C slave at the specified memory address and return them as an 32bit unsigned integer
jack1930 5:66ca6c9b15f2 184 * @param device_address The address of the device to read from
jack1930 5:66ca6c9b15f2 185 * @param start_address The memory address to read from
jack1930 5:66ca6c9b15f2 186 * @return MSB 32bit unsigned integer
jack1930 5:66ca6c9b15f2 187 */
jack1930 5:66ca6c9b15f2 188 uint32_t SoftwareI2C::read24(uint8_t device_address, uint8_t start_address) {
jack1930 5:66ca6c9b15f2 189 uint8_t value_array[4] = {0, 0, 0};
jack1930 5:66ca6c9b15f2 190 randomRead(device_address, start_address, value_array, 3 );
jack1930 5:66ca6c9b15f2 191 uint32_t value = 0;
jack1930 5:66ca6c9b15f2 192 value = value_array[0] << 16;
jack1930 5:66ca6c9b15f2 193 value |= value_array[1] << 8;
jack1930 5:66ca6c9b15f2 194 value |= value_array[2];
jack1930 5:66ca6c9b15f2 195
jack1930 5:66ca6c9b15f2 196 return value;
jack1930 5:66ca6c9b15f2 197 }
jack1930 5:66ca6c9b15f2 198
jack1930 5:66ca6c9b15f2 199 /**
jack1930 5:66ca6c9b15f2 200 * @brief Read 4 bytes from the I2C slave at the specified memory address and return them as an 32bit unsigned integer
jack1930 5:66ca6c9b15f2 201 * @param device_address The address of the device to read from
jack1930 5:66ca6c9b15f2 202 * @param start_address The memory address to read from
jack1930 5:66ca6c9b15f2 203 * @return MSB 32bit unsigned integer
jack1930 5:66ca6c9b15f2 204 */
jack1930 5:66ca6c9b15f2 205 uint32_t SoftwareI2C::read32(uint8_t device_address, uint8_t start_address) {
jack1930 5:66ca6c9b15f2 206 uint8_t value_array[4] = {0, 0, 0, 0};
jack1930 5:66ca6c9b15f2 207 randomRead(device_address, start_address, value_array, 4 );
jack1930 5:66ca6c9b15f2 208 uint32_t value = 0;
jack1930 5:66ca6c9b15f2 209 value = value_array[0] << 24;
jack1930 5:66ca6c9b15f2 210 value |= value_array[1] << 16;
jack1930 5:66ca6c9b15f2 211 value |= value_array[2] << 8;
jack1930 5:66ca6c9b15f2 212 value |= value_array[3];
jack1930 5:66ca6c9b15f2 213
jack1930 5:66ca6c9b15f2 214 return value;
jack1930 5:66ca6c9b15f2 215 }