Canberk Sönmez / Mbed 2 deprecated LTC2945_Monitor

LTC2945 ported

Dependencies:   mbed

LT_I2C.cpp@2:7e390bcce297, 2017-08-25 (annotated)

Committer:
odtulumbedder
Date:
Fri Aug 25 07:46:48 2017 +0000
Revision:
2:7e390bcce297
Parent:
1:6d4265aa4184
Child:
3:2ab78e7e8518
Now, it's working.; The problems were:; 1- I forgot ack = 0 in the main loop.; 2- Adding other calls between I2C calls causes latency, which interrupts I2C communication.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
odtulumbedder 0:6be57f391716 1 #include "LT_I2C.h"
odtulumbedder 0:6be57f391716 2
odtulumbedder 0:6be57f391716 3 /* mbed headers */
odtulumbedder 0:6be57f391716 4 #include <mbed.h>
odtulumbedder 0:6be57f391716 5 #include <I2C.h>
odtulumbedder 0:6be57f391716 6
odtulumbedder 2:7e390bcce297 7 I2C *i2c_object = NULL;
odtulumbedder 1:6d4265aa4184 8
odtulumbedder 0:6be57f391716 9 extern "C" {
odtulumbedder 0:6be57f391716 10
odtulumbedder 0:6be57f391716 11 int lt_i2c_init(int sda, int scl) {
odtulumbedder 0:6be57f391716 12 if (i2c_object == NULL) {
odtulumbedder 0:6be57f391716 13 i2c_object = new I2C((PinName) sda, (PinName) scl);
odtulumbedder 0:6be57f391716 14 return LT_I2C_INIT_FINE;
odtulumbedder 0:6be57f391716 15 }
odtulumbedder 0:6be57f391716 16 else {
odtulumbedder 0:6be57f391716 17 return LT_I2C_INIT_QUIT_FIRST;
odtulumbedder 0:6be57f391716 18 }
odtulumbedder 0:6be57f391716 19 }
odtulumbedder 0:6be57f391716 20
odtulumbedder 0:6be57f391716 21 int lt_i2c_quit() {
odtulumbedder 0:6be57f391716 22 delete i2c_object;
odtulumbedder 0:6be57f391716 23 return LT_I2C_SUCCESS;
odtulumbedder 0:6be57f391716 24 }
odtulumbedder 0:6be57f391716 25
odtulumbedder 0:6be57f391716 26 int lt_i2c_init_attach(void *p_i2c_object) {
odtulumbedder 0:6be57f391716 27 if (i2c_object == NULL) {
odtulumbedder 0:6be57f391716 28 i2c_object = (I2C *) p_i2c_object;
odtulumbedder 0:6be57f391716 29 return LT_I2C_INIT_FINE;
odtulumbedder 0:6be57f391716 30 }
odtulumbedder 0:6be57f391716 31 else {
odtulumbedder 0:6be57f391716 32 return LT_I2C_INIT_QUIT_FIRST;
odtulumbedder 0:6be57f391716 33 }
odtulumbedder 0:6be57f391716 34 }
odtulumbedder 0:6be57f391716 35
odtulumbedder 0:6be57f391716 36 void *lt_i2c_get_i2c_object() {
odtulumbedder 0:6be57f391716 37 return i2c_object;
odtulumbedder 0:6be57f391716 38 }
odtulumbedder 0:6be57f391716 39
odtulumbedder 0:6be57f391716 40 #define CHECK_OBJECT if (i2c_object == NULL) return LT_I2C_FAILURE;
odtulumbedder 0:6be57f391716 41
odtulumbedder 0:6be57f391716 42 int lt_i2c_start() {
odtulumbedder 0:6be57f391716 43 i2c_object->start();
odtulumbedder 0:6be57f391716 44 return LT_I2C_SUCCESS;
odtulumbedder 0:6be57f391716 45 }
odtulumbedder 0:6be57f391716 46
odtulumbedder 0:6be57f391716 47 int lt_i2c_stop() {
odtulumbedder 0:6be57f391716 48 i2c_object->stop();
odtulumbedder 0:6be57f391716 49 return LT_I2C_SUCCESS;
odtulumbedder 0:6be57f391716 50 }
odtulumbedder 0:6be57f391716 51
odtulumbedder 0:6be57f391716 52 uint8_t lt_i2c_write(uint8_t data) {
odtulumbedder 2:7e390bcce297 53 return 1-i2c_object->write(data);
odtulumbedder 0:6be57f391716 54 }
odtulumbedder 0:6be57f391716 55
odtulumbedder 0:6be57f391716 56 uint8_t lt_i2c_read(int8_t ack) {
odtulumbedder 0:6be57f391716 57 return (uint8_t) (i2c_object->read(1-ack)); // act is different in mbed
odtulumbedder 0:6be57f391716 58 }
odtulumbedder 0:6be57f391716 59
odtulumbedder 0:6be57f391716 60 int8_t lt_i2c_write_byte_data(
odtulumbedder 0:6be57f391716 61 uint8_t address,
odtulumbedder 0:6be57f391716 62 uint8_t command,
odtulumbedder 0:6be57f391716 63 uint8_t value) {
odtulumbedder 0:6be57f391716 64 int8_t ret = 0;
odtulumbedder 0:6be57f391716 65 if (lt_i2c_start()!=0) //I2C START
odtulumbedder 1:6d4265aa4184 66 {
odtulumbedder 0:6be57f391716 67 return(1); //Stop and return 0 if START fail
odtulumbedder 1:6d4265aa4184 68 }
odtulumbedder 0:6be57f391716 69 ret |= lt_i2c_write((address<<1)|LT_I2C_WRITE_BIT);
odtulumbedder 0:6be57f391716 70 // Write 7 bit address with W bit
odtulumbedder 0:6be57f391716 71 ret|= lt_i2c_write(command); // Set register to be read to command
odtulumbedder 0:6be57f391716 72 ret|= lt_i2c_write(value);
odtulumbedder 0:6be57f391716 73 lt_i2c_stop(); // I2C STOP
odtulumbedder 0:6be57f391716 74 if (ret!=0) //If there was a NAK return 1
odtulumbedder 1:6d4265aa4184 75 {
odtulumbedder 0:6be57f391716 76 return(1);
odtulumbedder 1:6d4265aa4184 77 }
odtulumbedder 0:6be57f391716 78 return(0); // Return success
odtulumbedder 0:6be57f391716 79 }
odtulumbedder 0:6be57f391716 80
odtulumbedder 0:6be57f391716 81 int8_t lt_i2c_write_word_data(
odtulumbedder 0:6be57f391716 82 uint8_t address,
odtulumbedder 0:6be57f391716 83 uint8_t command,
odtulumbedder 0:6be57f391716 84 uint16_t value) {
odtulumbedder 0:6be57f391716 85 int8_t ret=0;
odtulumbedder 0:6be57f391716 86 union
odtulumbedder 0:6be57f391716 87 {
odtulumbedder 0:6be57f391716 88 uint8_t b[2];
odtulumbedder 0:6be57f391716 89 uint16_t w;
odtulumbedder 0:6be57f391716 90 } data;
odtulumbedder 0:6be57f391716 91 data.w = value;
odtulumbedder 0:6be57f391716 92 if (lt_i2c_start()!=0) //I2C START
odtulumbedder 1:6d4265aa4184 93 {
odtulumbedder 0:6be57f391716 94 return(1); //Stop and return 0 if START fail
odtulumbedder 1:6d4265aa4184 95 }
odtulumbedder 0:6be57f391716 96 ret |= lt_i2c_write((address<<1)|LT_I2C_WRITE_BIT);
odtulumbedder 0:6be57f391716 97 // Write 7 bit address with W bit
odtulumbedder 0:6be57f391716 98 ret|= lt_i2c_write(command); // Set register to be read to command
odtulumbedder 0:6be57f391716 99 ret|= lt_i2c_write(data.b[1]); //Write MSB
odtulumbedder 0:6be57f391716 100 ret|= lt_i2c_write(data.b[0]); //Write LSB;
odtulumbedder 0:6be57f391716 101 lt_i2c_stop(); // I2C STOP
odtulumbedder 0:6be57f391716 102 if (ret!=0) //If there was a NAK return 1
odtulumbedder 1:6d4265aa4184 103 {
odtulumbedder 2:7e390bcce297 104 return(1);
odtulumbedder 1:6d4265aa4184 105 }
odtulumbedder 0:6be57f391716 106 return(0);
odtulumbedder 0:6be57f391716 107 }
odtulumbedder 0:6be57f391716 108
odtulumbedder 0:6be57f391716 109 uint8_t lt_i2c_write_block_data(
odtulumbedder 0:6be57f391716 110 uint8_t address,
odtulumbedder 0:6be57f391716 111 uint8_t command,
odtulumbedder 0:6be57f391716 112 uint8_t length,
odtulumbedder 0:6be57f391716 113 uint8_t *values) {
odtulumbedder 0:6be57f391716 114 int8_t i = length-1;
odtulumbedder 0:6be57f391716 115 int8_t ret = 0;
odtulumbedder 0:6be57f391716 116 if (lt_i2c_start()!=0) //I2C START
odtulumbedder 0:6be57f391716 117 return(1); //Stop and return 0 if START fail
odtulumbedder 0:6be57f391716 118 ret |= lt_i2c_write((address<<1)|LT_I2C_WRITE_BIT);
odtulumbedder 0:6be57f391716 119 // Write 7 bit address with W bit
odtulumbedder 0:6be57f391716 120 ret|= lt_i2c_write(command); // Set register to be read to command
odtulumbedder 0:6be57f391716 121 while (i>=0)
odtulumbedder 0:6be57f391716 122 {
odtulumbedder 0:6be57f391716 123 ret|= lt_i2c_write(values[i]); //Write Value
odtulumbedder 0:6be57f391716 124 i--;
odtulumbedder 0:6be57f391716 125 }
odtulumbedder 0:6be57f391716 126 lt_i2c_stop(); // I2C STOP
odtulumbedder 0:6be57f391716 127 if (ret!=0)
odtulumbedder 1:6d4265aa4184 128 {
odtulumbedder 0:6be57f391716 129 return(1);
odtulumbedder 1:6d4265aa4184 130 }
odtulumbedder 0:6be57f391716 131 else
odtulumbedder 1:6d4265aa4184 132 {
odtulumbedder 0:6be57f391716 133 return(0); // Success!
odtulumbedder 1:6d4265aa4184 134 }
odtulumbedder 0:6be57f391716 135 }
odtulumbedder 0:6be57f391716 136
odtulumbedder 0:6be57f391716 137 uint8_t lt_i2c_read_byte_data(
odtulumbedder 0:6be57f391716 138 uint8_t address,
odtulumbedder 0:6be57f391716 139 uint8_t command,
odtulumbedder 0:6be57f391716 140 uint8_t *value) {
odtulumbedder 0:6be57f391716 141 int8_t ret = 0;
odtulumbedder 0:6be57f391716 142 if (lt_i2c_start() != 0) // I2C START
odtulumbedder 0:6be57f391716 143 {
odtulumbedder 0:6be57f391716 144 return (1); // Stop and return 0 if START fail
odtulumbedder 0:6be57f391716 145 }
odtulumbedder 0:6be57f391716 146 ret |= lt_i2c_write((address << 1) | LT_I2C_WRITE_BIT); // Write 7 bit address with W bit
odtulumbedder 0:6be57f391716 147 if (ret != 0) // If NACK return 1
odtulumbedder 0:6be57f391716 148 {
odtulumbedder 0:6be57f391716 149 lt_i2c_stop(); // I2C STOP
odtulumbedder 0:6be57f391716 150 return (1);
odtulumbedder 0:6be57f391716 151 }
odtulumbedder 0:6be57f391716 152 ret |= lt_i2c_write(command); // Set register to be read to command
odtulumbedder 0:6be57f391716 153 if (ret != 0) // If NACK return 1
odtulumbedder 0:6be57f391716 154 {
odtulumbedder 0:6be57f391716 155 lt_i2c_stop(); // I2C STOP
odtulumbedder 0:6be57f391716 156 return (1);
odtulumbedder 0:6be57f391716 157 }
odtulumbedder 0:6be57f391716 158 if (lt_i2c_start() != 0) // I2C repeated START
odtulumbedder 0:6be57f391716 159 {
odtulumbedder 0:6be57f391716 160 lt_i2c_stop(); // Attempt to issue I2C STOP
odtulumbedder 0:6be57f391716 161 return (1); // Stop and return 0 if START fail
odtulumbedder 0:6be57f391716 162 }
odtulumbedder 0:6be57f391716 163 ret |= lt_i2c_write((address << 1) | LT_I2C_READ_BIT); // Write 7 bit address with R bit
odtulumbedder 0:6be57f391716 164 *value = lt_i2c_read(LT_I2C_WITH_NACK); // Read byte from buffer with NAK
odtulumbedder 0:6be57f391716 165 lt_i2c_stop(); // I2C STOP
odtulumbedder 0:6be57f391716 166 if (ret != 0) // If there was a NACK return 1
odtulumbedder 0:6be57f391716 167 {
odtulumbedder 0:6be57f391716 168 return (1);
odtulumbedder 0:6be57f391716 169 }
odtulumbedder 0:6be57f391716 170 return (0); // Return success
odtulumbedder 0:6be57f391716 171 }
odtulumbedder 0:6be57f391716 172
odtulumbedder 0:6be57f391716 173 uint8_t lt_i2c_read_word_data(
odtulumbedder 0:6be57f391716 174 uint8_t address,
odtulumbedder 0:6be57f391716 175 uint8_t command,
odtulumbedder 0:6be57f391716 176 uint16_t *value) {
odtulumbedder 0:6be57f391716 177 int8_t ret = 0;
odtulumbedder 0:6be57f391716 178 union {
odtulumbedder 0:6be57f391716 179 uint8_t b[2];
odtulumbedder 0:6be57f391716 180 uint16_t w;
odtulumbedder 0:6be57f391716 181 } data;
odtulumbedder 0:6be57f391716 182 if (lt_i2c_start() != 0) //I2C START
odtulumbedder 1:6d4265aa4184 183 {
odtulumbedder 0:6be57f391716 184 return (1); //Stop and return 0 if START fail
odtulumbedder 1:6d4265aa4184 185 }
odtulumbedder 0:6be57f391716 186 ret |= lt_i2c_write((address << 1) | LT_I2C_WRITE_BIT); // Write 7 bit address with W bit
odtulumbedder 0:6be57f391716 187 if (ret != 0) //If NACK return 1
odtulumbedder 0:6be57f391716 188 {
odtulumbedder 0:6be57f391716 189 lt_i2c_stop(); //I2C STOP
odtulumbedder 0:6be57f391716 190 return (1);
odtulumbedder 0:6be57f391716 191 }
odtulumbedder 0:6be57f391716 192 ret |= lt_i2c_write(command); // Set register to be read to command
odtulumbedder 0:6be57f391716 193 if (ret != 0) //If NACK return 1
odtulumbedder 0:6be57f391716 194 {
odtulumbedder 0:6be57f391716 195 lt_i2c_stop(); //I2C STOP
odtulumbedder 0:6be57f391716 196 return (1);
odtulumbedder 0:6be57f391716 197 }
odtulumbedder 0:6be57f391716 198 if (lt_i2c_start() != 0) //I2C START
odtulumbedder 0:6be57f391716 199 {
odtulumbedder 0:6be57f391716 200 lt_i2c_stop(); //Attempt to issue I2C STOP
odtulumbedder 0:6be57f391716 201 return (1); //Stop and return 0 if START fail
odtulumbedder 0:6be57f391716 202 }
odtulumbedder 0:6be57f391716 203 ret |= lt_i2c_write((address << 1) | LT_I2C_READ_BIT); // Write 7 bit address with R bit
odtulumbedder 0:6be57f391716 204 data.b[1] = lt_i2c_read(LT_I2C_WITH_ACK); // Read MSB from buffer
odtulumbedder 0:6be57f391716 205 data.b[0] = lt_i2c_read(LT_I2C_WITH_NACK); // Read LSB from buffer
odtulumbedder 0:6be57f391716 206 lt_i2c_stop(); //I2C STOP
odtulumbedder 0:6be57f391716 207 *value = data.w;
odtulumbedder 0:6be57f391716 208 if (ret != 0) //If NAK
odtulumbedder 1:6d4265aa4184 209 {
odtulumbedder 0:6be57f391716 210 return (1); //return 1
odtulumbedder 1:6d4265aa4184 211 }
odtulumbedder 0:6be57f391716 212 return (0); // Return success
odtulumbedder 0:6be57f391716 213 }
odtulumbedder 0:6be57f391716 214
odtulumbedder 0:6be57f391716 215 uint8_t lt_i2c_read_block_data(
odtulumbedder 0:6be57f391716 216 uint8_t address,
odtulumbedder 0:6be57f391716 217 uint8_t command,
odtulumbedder 0:6be57f391716 218 uint8_t length,
odtulumbedder 0:6be57f391716 219 uint8_t *values) {
odtulumbedder 0:6be57f391716 220 uint8_t i = (length - 1);
odtulumbedder 0:6be57f391716 221 int8_t ret = 0;
odtulumbedder 0:6be57f391716 222 if (lt_i2c_start() != 0) //I2C START
odtulumbedder 1:6d4265aa4184 223 {
odtulumbedder 0:6be57f391716 224 return (1); //Stop and return 0 if START fail
odtulumbedder 1:6d4265aa4184 225 }
odtulumbedder 0:6be57f391716 226 ret |= lt_i2c_write((address << 1) | LT_I2C_WRITE_BIT); //Write 7-bit address with W bit
odtulumbedder 0:6be57f391716 227 if (ret != 0) //If NACK return 1
odtulumbedder 0:6be57f391716 228 {
odtulumbedder 0:6be57f391716 229 lt_i2c_stop(); //I2C STOP
odtulumbedder 0:6be57f391716 230 return (1);
odtulumbedder 0:6be57f391716 231 }
odtulumbedder 0:6be57f391716 232 ret |= lt_i2c_write(command); //Write 8 bit command word
odtulumbedder 0:6be57f391716 233 if (ret != 0) //If NACK return 1
odtulumbedder 0:6be57f391716 234 {
odtulumbedder 0:6be57f391716 235 lt_i2c_stop(); //I2C STOP
odtulumbedder 0:6be57f391716 236 return (1);
odtulumbedder 0:6be57f391716 237 }
odtulumbedder 0:6be57f391716 238 if (lt_i2c_start() != 0) //I2C repeated START
odtulumbedder 0:6be57f391716 239 {
odtulumbedder 0:6be57f391716 240 lt_i2c_stop(); //Attempt to issue I2C STOP
odtulumbedder 0:6be57f391716 241 return (1); //Stop and return 0 if START fail
odtulumbedder 0:6be57f391716 242 }
odtulumbedder 0:6be57f391716 243 ret |= lt_i2c_write((address << 1) | LT_I2C_READ_BIT); //Write 7-bit address with R bit
odtulumbedder 0:6be57f391716 244 if (ret != 0) //If NACK return 1
odtulumbedder 0:6be57f391716 245 {
odtulumbedder 0:6be57f391716 246 lt_i2c_stop(); //I2C STOP
odtulumbedder 0:6be57f391716 247 return (1);
odtulumbedder 0:6be57f391716 248 }
odtulumbedder 0:6be57f391716 249 while (i > 0) //Begin read loop
odtulumbedder 0:6be57f391716 250 {
odtulumbedder 0:6be57f391716 251 values[i] = lt_i2c_read(LT_I2C_WITH_ACK); //Read from bus with ACK
odtulumbedder 0:6be57f391716 252 i--;
odtulumbedder 0:6be57f391716 253 }
odtulumbedder 0:6be57f391716 254 values[0] = lt_i2c_read(LT_I2C_WITH_NACK); //Read from bus with NACK for the last one;
odtulumbedder 0:6be57f391716 255 lt_i2c_stop(); //I2C STOP
odtulumbedder 0:6be57f391716 256 return (0); // Success!
odtulumbedder 0:6be57f391716 257 }
odtulumbedder 0:6be57f391716 258
odtulumbedder 0:6be57f391716 259 }