Li Weiyi / Mbed 2 deprecated ESP8266BlynkWeatherStation

work.

Dependencies:   Blynk mbed

I2Cdev.cpp@2:6cd3b0947188, 2016-06-15 (annotated)

Committer:
lixianyu
Date:
Wed Jun 15 03:08:40 2016 +0000
Revision:
2:6cd3b0947188
Child:
3:4cd9171ba989
PM2.5????????5V??????????

Who changed what in which revision?

UserRevisionLine numberNew contents of line
lixianyu 2:6cd3b0947188 1 #include "I2Cdev.h"
lixianyu 2:6cd3b0947188 2
lixianyu 2:6cd3b0947188 3 extern DigitalOut myled;
lixianyu 2:6cd3b0947188 4 static uint8_t buffer[24];
lixianyu 2:6cd3b0947188 5 //I2C g_i2c1(P0_11, P0_10);
lixianyu 2:6cd3b0947188 6 extern I2C g_i2c;
lixianyu 2:6cd3b0947188 7
lixianyu 2:6cd3b0947188 8 uint16_t I2Cdev::readTimeout = I2CDEV_DEFAULT_READ_TIMEOUT;
lixianyu 2:6cd3b0947188 9
lixianyu 2:6cd3b0947188 10 void I2Cdev::init()
lixianyu 2:6cd3b0947188 11 {
lixianyu 2:6cd3b0947188 12 g_i2c.frequency(267000);
lixianyu 2:6cd3b0947188 13 }
lixianyu 2:6cd3b0947188 14
lixianyu 2:6cd3b0947188 15 /** Default constructor.
lixianyu 2:6cd3b0947188 16 */
lixianyu 2:6cd3b0947188 17 I2Cdev::I2Cdev()
lixianyu 2:6cd3b0947188 18 {
lixianyu 2:6cd3b0947188 19 g_i2c.frequency(400000);
lixianyu 2:6cd3b0947188 20 //myled = 1;
lixianyu 2:6cd3b0947188 21 }
lixianyu 2:6cd3b0947188 22
lixianyu 2:6cd3b0947188 23 /** Read a single bit from an 8-bit device register.
lixianyu 2:6cd3b0947188 24 * @param devAddr I2C slave device address
lixianyu 2:6cd3b0947188 25 * @param regAddr Register regAddr to read from
lixianyu 2:6cd3b0947188 26 * @param bitNum Bit position to read (0-7)
lixianyu 2:6cd3b0947188 27 * @param data Container for single bit value
lixianyu 2:6cd3b0947188 28 * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
lixianyu 2:6cd3b0947188 29 * @return Status of read operation (true = success)
lixianyu 2:6cd3b0947188 30 */
lixianyu 2:6cd3b0947188 31 int8_t I2Cdev::readBit(uint8_t devAddr, uint8_t regAddr, uint8_t bitNum, uint8_t *data, uint16_t timeout)
lixianyu 2:6cd3b0947188 32 {
lixianyu 2:6cd3b0947188 33 uint8_t b;
lixianyu 2:6cd3b0947188 34 uint8_t count = readByte(devAddr, regAddr, &b, timeout);
lixianyu 2:6cd3b0947188 35 *data = b & (1 << bitNum);
lixianyu 2:6cd3b0947188 36 return count;
lixianyu 2:6cd3b0947188 37 }
lixianyu 2:6cd3b0947188 38
lixianyu 2:6cd3b0947188 39 /** Read a single bit from a 16-bit device register.
lixianyu 2:6cd3b0947188 40 * @param devAddr I2C slave device address
lixianyu 2:6cd3b0947188 41 * @param regAddr Register regAddr to read from
lixianyu 2:6cd3b0947188 42 * @param bitNum Bit position to read (0-15)
lixianyu 2:6cd3b0947188 43 * @param data Container for single bit value
lixianyu 2:6cd3b0947188 44 * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
lixianyu 2:6cd3b0947188 45 * @return Status of read operation (true = success)
lixianyu 2:6cd3b0947188 46 */
lixianyu 2:6cd3b0947188 47 int8_t I2Cdev::readBitW(uint8_t devAddr, uint8_t regAddr, uint8_t bitNum, uint16_t *data, uint16_t timeout)
lixianyu 2:6cd3b0947188 48 {
lixianyu 2:6cd3b0947188 49 uint16_t b;
lixianyu 2:6cd3b0947188 50 uint8_t count = readWord(devAddr, regAddr, &b, timeout);
lixianyu 2:6cd3b0947188 51 *data = b & (1 << bitNum);
lixianyu 2:6cd3b0947188 52 return count;
lixianyu 2:6cd3b0947188 53 }
lixianyu 2:6cd3b0947188 54
lixianyu 2:6cd3b0947188 55 /** Read multiple bits from an 8-bit device register.
lixianyu 2:6cd3b0947188 56 * @param devAddr I2C slave device address
lixianyu 2:6cd3b0947188 57 * @param regAddr Register regAddr to read from
lixianyu 2:6cd3b0947188 58 * @param bitStart First bit position to read (0-7)
lixianyu 2:6cd3b0947188 59 * @param length Number of bits to read (not more than 8)
lixianyu 2:6cd3b0947188 60 * @param data Container for right-aligned value (i.e. '101' read from any bitStart position will equal 0x05)
lixianyu 2:6cd3b0947188 61 * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
lixianyu 2:6cd3b0947188 62 * @return Status of read operation (true = success)
lixianyu 2:6cd3b0947188 63 */
lixianyu 2:6cd3b0947188 64 int8_t I2Cdev::readBits(uint8_t devAddr, uint8_t regAddr, uint8_t bitStart, uint8_t length, uint8_t *data, uint16_t timeout)
lixianyu 2:6cd3b0947188 65 {
lixianyu 2:6cd3b0947188 66 // 01101001 read byte
lixianyu 2:6cd3b0947188 67 // 76543210 bit numbers
lixianyu 2:6cd3b0947188 68 // xxx args: bitStart=4, length=3
lixianyu 2:6cd3b0947188 69 // 010 masked
lixianyu 2:6cd3b0947188 70 // -> 010 shifted
lixianyu 2:6cd3b0947188 71 uint8_t count, b;
lixianyu 2:6cd3b0947188 72 if ((count = readByte(devAddr, regAddr, &b, timeout)) != 0) {
lixianyu 2:6cd3b0947188 73 uint8_t mask = ((1 << length) - 1) << (bitStart - length + 1);
lixianyu 2:6cd3b0947188 74 b &= mask;
lixianyu 2:6cd3b0947188 75 b >>= (bitStart - length + 1);
lixianyu 2:6cd3b0947188 76 *data = b;
lixianyu 2:6cd3b0947188 77 }
lixianyu 2:6cd3b0947188 78 return count;
lixianyu 2:6cd3b0947188 79 }
lixianyu 2:6cd3b0947188 80
lixianyu 2:6cd3b0947188 81 /** Read multiple bits from a 16-bit device register.
lixianyu 2:6cd3b0947188 82 * @param devAddr I2C slave device address
lixianyu 2:6cd3b0947188 83 * @param regAddr Register regAddr to read from
lixianyu 2:6cd3b0947188 84 * @param bitStart First bit position to read (0-15)
lixianyu 2:6cd3b0947188 85 * @param length Number of bits to read (not more than 16)
lixianyu 2:6cd3b0947188 86 * @param data Container for right-aligned value (i.e. '101' read from any bitStart position will equal 0x05)
lixianyu 2:6cd3b0947188 87 * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
lixianyu 2:6cd3b0947188 88 * @return Status of read operation (1 = success, 0 = failure, -1 = timeout)
lixianyu 2:6cd3b0947188 89 */
lixianyu 2:6cd3b0947188 90 int8_t I2Cdev::readBitsW(uint8_t devAddr, uint8_t regAddr, uint8_t bitStart, uint8_t length, uint16_t *data, uint16_t timeout)
lixianyu 2:6cd3b0947188 91 {
lixianyu 2:6cd3b0947188 92 // 1101011001101001 read byte
lixianyu 2:6cd3b0947188 93 // fedcba9876543210 bit numbers
lixianyu 2:6cd3b0947188 94 // xxx args: bitStart=12, length=3
lixianyu 2:6cd3b0947188 95 // 010 masked
lixianyu 2:6cd3b0947188 96 // -> 010 shifted
lixianyu 2:6cd3b0947188 97 uint8_t count;
lixianyu 2:6cd3b0947188 98 uint16_t w;
lixianyu 2:6cd3b0947188 99 if ((count = readWord(devAddr, regAddr, &w, timeout)) != 0) {
lixianyu 2:6cd3b0947188 100 uint16_t mask = ((1 << length) - 1) << (bitStart - length + 1);
lixianyu 2:6cd3b0947188 101 w &= mask;
lixianyu 2:6cd3b0947188 102 w >>= (bitStart - length + 1);
lixianyu 2:6cd3b0947188 103 *data = w;
lixianyu 2:6cd3b0947188 104 }
lixianyu 2:6cd3b0947188 105 return count;
lixianyu 2:6cd3b0947188 106 }
lixianyu 2:6cd3b0947188 107
lixianyu 2:6cd3b0947188 108 /** Read single byte from an 8-bit device register.
lixianyu 2:6cd3b0947188 109 * @param devAddr I2C slave device address
lixianyu 2:6cd3b0947188 110 * @param regAddr Register regAddr to read from
lixianyu 2:6cd3b0947188 111 * @param data Container for byte value read from device
lixianyu 2:6cd3b0947188 112 * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
lixianyu 2:6cd3b0947188 113 * @return Status of read operation (true = success)
lixianyu 2:6cd3b0947188 114 */
lixianyu 2:6cd3b0947188 115 int8_t I2Cdev::readByte(uint8_t devAddr, uint8_t regAddr, uint8_t *data, uint16_t timeout)
lixianyu 2:6cd3b0947188 116 {
lixianyu 2:6cd3b0947188 117 return readBytes(devAddr, regAddr, 1, data, timeout);
lixianyu 2:6cd3b0947188 118 }
lixianyu 2:6cd3b0947188 119
lixianyu 2:6cd3b0947188 120 /** Read single word from a 16-bit device register.
lixianyu 2:6cd3b0947188 121 * @param devAddr I2C slave device address
lixianyu 2:6cd3b0947188 122 * @param regAddr Register regAddr to read from
lixianyu 2:6cd3b0947188 123 * @param data Container for word value read from device
lixianyu 2:6cd3b0947188 124 * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
lixianyu 2:6cd3b0947188 125 * @return Status of read operation (true = success)
lixianyu 2:6cd3b0947188 126 */
lixianyu 2:6cd3b0947188 127 int8_t I2Cdev::readWord(uint8_t devAddr, uint8_t regAddr, uint16_t *data, uint16_t timeout)
lixianyu 2:6cd3b0947188 128 {
lixianyu 2:6cd3b0947188 129 return readWords(devAddr, regAddr, 1, data, timeout);
lixianyu 2:6cd3b0947188 130 }
lixianyu 2:6cd3b0947188 131
lixianyu 2:6cd3b0947188 132 /** Read multiple bytes from an 8-bit device register.
lixianyu 2:6cd3b0947188 133 * @param devAddr I2C slave device address
lixianyu 2:6cd3b0947188 134 * @param regAddr First register regAddr to read from
lixianyu 2:6cd3b0947188 135 * @param length Number of bytes to read
lixianyu 2:6cd3b0947188 136 * @param data Buffer to store read data in
lixianyu 2:6cd3b0947188 137 * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
lixianyu 2:6cd3b0947188 138 * @return Number of bytes read (-1 indicates failure)
lixianyu 2:6cd3b0947188 139 */
lixianyu 2:6cd3b0947188 140 int8_t I2Cdev::readBytes(uint8_t devAddr, uint8_t regAddr, uint8_t length, uint8_t *data, uint16_t timeout)
lixianyu 2:6cd3b0947188 141 {
lixianyu 2:6cd3b0947188 142 g_i2c.write(devAddr << 1, (char*)&regAddr, 1, false);
lixianyu 2:6cd3b0947188 143 uint8_t realReadAddr = (devAddr << 1) | 0x01;
lixianyu 2:6cd3b0947188 144 int retRead = g_i2c.read(realReadAddr, (char*)data, length);
lixianyu 2:6cd3b0947188 145 if (retRead == 0) {
lixianyu 2:6cd3b0947188 146 return length;
lixianyu 2:6cd3b0947188 147 }
lixianyu 2:6cd3b0947188 148 return -1;
lixianyu 2:6cd3b0947188 149 }
lixianyu 2:6cd3b0947188 150
lixianyu 2:6cd3b0947188 151 int8_t I2Cdev::readBytesOnly(uint8_t devAddr, uint8_t length, uint8_t *data, uint16_t timeout)
lixianyu 2:6cd3b0947188 152 {
lixianyu 2:6cd3b0947188 153 uint8_t realReadAddr = (devAddr << 1) | 0x01;
lixianyu 2:6cd3b0947188 154 int retRead = g_i2c.read(realReadAddr, (char*)data, length);
lixianyu 2:6cd3b0947188 155 if (retRead == 0) {
lixianyu 2:6cd3b0947188 156 return length;
lixianyu 2:6cd3b0947188 157 }
lixianyu 2:6cd3b0947188 158 return -1;
lixianyu 2:6cd3b0947188 159 }
lixianyu 2:6cd3b0947188 160
lixianyu 2:6cd3b0947188 161 /** Read multiple words from a 16-bit device register.
lixianyu 2:6cd3b0947188 162 * @param devAddr I2C slave device address
lixianyu 2:6cd3b0947188 163 * @param regAddr First register regAddr to read from
lixianyu 2:6cd3b0947188 164 * @param length Number of words to read
lixianyu 2:6cd3b0947188 165 * @param data Buffer to store read data in
lixianyu 2:6cd3b0947188 166 * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
lixianyu 2:6cd3b0947188 167 * @return Number of words read (0 indicates failure)
lixianyu 2:6cd3b0947188 168 */
lixianyu 2:6cd3b0947188 169 int8_t I2Cdev::readWords(uint8_t devAddr, uint8_t regAddr, uint8_t length, uint16_t *data, uint16_t timeout)
lixianyu 2:6cd3b0947188 170 {
lixianyu 2:6cd3b0947188 171 g_i2c.write(devAddr << 1, (char*)&regAddr, 1, false);
lixianyu 2:6cd3b0947188 172 uint8_t realReadAddr = (devAddr << 1) | 0x01;
lixianyu 2:6cd3b0947188 173 int retRead = g_i2c.read(realReadAddr, (char*)data, length*2);
lixianyu 2:6cd3b0947188 174 if (retRead == 0) {
lixianyu 2:6cd3b0947188 175 return length;
lixianyu 2:6cd3b0947188 176 }
lixianyu 2:6cd3b0947188 177 return 0;
lixianyu 2:6cd3b0947188 178 }
lixianyu 2:6cd3b0947188 179
lixianyu 2:6cd3b0947188 180 /** write a single bit in an 8-bit device register.
lixianyu 2:6cd3b0947188 181 * @param devAddr I2C slave device address
lixianyu 2:6cd3b0947188 182 * @param regAddr Register regAddr to write to
lixianyu 2:6cd3b0947188 183 * @param bitNum Bit position to write (0-7)
lixianyu 2:6cd3b0947188 184 * @param value New bit value to write
lixianyu 2:6cd3b0947188 185 * @return Status of operation (true = success)
lixianyu 2:6cd3b0947188 186 */
lixianyu 2:6cd3b0947188 187 bool I2Cdev::writeBit(uint8_t devAddr, uint8_t regAddr, uint8_t bitNum, uint8_t data)
lixianyu 2:6cd3b0947188 188 {
lixianyu 2:6cd3b0947188 189 uint8_t b;
lixianyu 2:6cd3b0947188 190 readByte(devAddr, regAddr, &b);
lixianyu 2:6cd3b0947188 191 b = (data != 0) ? (b | (1 << bitNum)) : (b & ~(1 << bitNum));
lixianyu 2:6cd3b0947188 192 return writeByte(devAddr, regAddr, b);
lixianyu 2:6cd3b0947188 193 }
lixianyu 2:6cd3b0947188 194
lixianyu 2:6cd3b0947188 195 /** write a single bit in a 16-bit device register.
lixianyu 2:6cd3b0947188 196 * @param devAddr I2C slave device address
lixianyu 2:6cd3b0947188 197 * @param regAddr Register regAddr to write to
lixianyu 2:6cd3b0947188 198 * @param bitNum Bit position to write (0-15)
lixianyu 2:6cd3b0947188 199 * @param value New bit value to write
lixianyu 2:6cd3b0947188 200 * @return Status of operation (true = success)
lixianyu 2:6cd3b0947188 201 */
lixianyu 2:6cd3b0947188 202 bool I2Cdev::writeBitW(uint8_t devAddr, uint8_t regAddr, uint8_t bitNum, uint16_t data)
lixianyu 2:6cd3b0947188 203 {
lixianyu 2:6cd3b0947188 204 uint16_t w;
lixianyu 2:6cd3b0947188 205 readWord(devAddr, regAddr, &w);
lixianyu 2:6cd3b0947188 206 w = (data != 0) ? (w | (1 << bitNum)) : (w & ~(1 << bitNum));
lixianyu 2:6cd3b0947188 207 return writeWord(devAddr, regAddr, w);
lixianyu 2:6cd3b0947188 208 }
lixianyu 2:6cd3b0947188 209
lixianyu 2:6cd3b0947188 210 /** Write multiple bits in an 8-bit device register.
lixianyu 2:6cd3b0947188 211 * @param devAddr I2C slave device address
lixianyu 2:6cd3b0947188 212 * @param regAddr Register regAddr to write to
lixianyu 2:6cd3b0947188 213 * @param bitStart First bit position to write (0-7)
lixianyu 2:6cd3b0947188 214 * @param length Number of bits to write (not more than 8)
lixianyu 2:6cd3b0947188 215 * @param data Right-aligned value to write
lixianyu 2:6cd3b0947188 216 * @return Status of operation (true = success)
lixianyu 2:6cd3b0947188 217 */
lixianyu 2:6cd3b0947188 218 bool I2Cdev::writeBits(uint8_t devAddr, uint8_t regAddr, uint8_t bitStart, uint8_t length, uint8_t data)
lixianyu 2:6cd3b0947188 219 {
lixianyu 2:6cd3b0947188 220 // 010 value to write
lixianyu 2:6cd3b0947188 221 // 76543210 bit numbers
lixianyu 2:6cd3b0947188 222 // xxx args: bitStart=4, length=3
lixianyu 2:6cd3b0947188 223 // 00011100 mask byte
lixianyu 2:6cd3b0947188 224 // 10101111 original value (sample)
lixianyu 2:6cd3b0947188 225 // 10100011 original & ~mask
lixianyu 2:6cd3b0947188 226 // 10101011 masked | value
lixianyu 2:6cd3b0947188 227 uint8_t b;
lixianyu 2:6cd3b0947188 228 if (readByte(devAddr, regAddr, &b) != 0) {
lixianyu 2:6cd3b0947188 229 uint8_t mask = ((1 << length) - 1) << (bitStart - length + 1);
lixianyu 2:6cd3b0947188 230 data <<= (bitStart - length + 1); // shift data into correct position
lixianyu 2:6cd3b0947188 231 data &= mask; // zero all non-important bits in data
lixianyu 2:6cd3b0947188 232 b &= ~(mask); // zero all important bits in existing byte
lixianyu 2:6cd3b0947188 233 b |= data; // combine data with existing byte
lixianyu 2:6cd3b0947188 234 return writeByte(devAddr, regAddr, b);
lixianyu 2:6cd3b0947188 235 } else {
lixianyu 2:6cd3b0947188 236 return false;
lixianyu 2:6cd3b0947188 237 }
lixianyu 2:6cd3b0947188 238 }
lixianyu 2:6cd3b0947188 239
lixianyu 2:6cd3b0947188 240 /** Write multiple bits in a 16-bit device register.
lixianyu 2:6cd3b0947188 241 * @param devAddr I2C slave device address
lixianyu 2:6cd3b0947188 242 * @param regAddr Register regAddr to write to
lixianyu 2:6cd3b0947188 243 * @param bitStart First bit position to write (0-15)
lixianyu 2:6cd3b0947188 244 * @param length Number of bits to write (not more than 16)
lixianyu 2:6cd3b0947188 245 * @param data Right-aligned value to write
lixianyu 2:6cd3b0947188 246 * @return Status of operation (true = success)
lixianyu 2:6cd3b0947188 247 */
lixianyu 2:6cd3b0947188 248 bool I2Cdev::writeBitsW(uint8_t devAddr, uint8_t regAddr, uint8_t bitStart, uint8_t length, uint16_t data)
lixianyu 2:6cd3b0947188 249 {
lixianyu 2:6cd3b0947188 250 // 010 value to write
lixianyu 2:6cd3b0947188 251 // fedcba9876543210 bit numbers
lixianyu 2:6cd3b0947188 252 // xxx args: bitStart=12, length=3
lixianyu 2:6cd3b0947188 253 // 0001110000000000 mask byte
lixianyu 2:6cd3b0947188 254 // 1010111110010110 original value (sample)
lixianyu 2:6cd3b0947188 255 // 1010001110010110 original & ~mask
lixianyu 2:6cd3b0947188 256 // 1010101110010110 masked | value
lixianyu 2:6cd3b0947188 257 uint16_t w;
lixianyu 2:6cd3b0947188 258 if (readWord(devAddr, regAddr, &w) != 0) {
lixianyu 2:6cd3b0947188 259 uint8_t mask = ((1 << length) - 1) << (bitStart - length + 1);
lixianyu 2:6cd3b0947188 260 data <<= (bitStart - length + 1); // shift data into correct position
lixianyu 2:6cd3b0947188 261 data &= mask; // zero all non-important bits in data
lixianyu 2:6cd3b0947188 262 w &= ~(mask); // zero all important bits in existing word
lixianyu 2:6cd3b0947188 263 w |= data; // combine data with existing word
lixianyu 2:6cd3b0947188 264 return writeWord(devAddr, regAddr, w);
lixianyu 2:6cd3b0947188 265 } else {
lixianyu 2:6cd3b0947188 266 return false;
lixianyu 2:6cd3b0947188 267 }
lixianyu 2:6cd3b0947188 268 }
lixianyu 2:6cd3b0947188 269
lixianyu 2:6cd3b0947188 270 /** Write single byte to an 8-bit device register.
lixianyu 2:6cd3b0947188 271 * @param devAddr I2C slave device address
lixianyu 2:6cd3b0947188 272 * @param regAddr Register address to write to
lixianyu 2:6cd3b0947188 273 * @param data New byte value to write
lixianyu 2:6cd3b0947188 274 * @return Status of operation (true = success)
lixianyu 2:6cd3b0947188 275 */
lixianyu 2:6cd3b0947188 276 bool I2Cdev::writeByte(uint8_t devAddr, uint8_t regAddr, uint8_t data)
lixianyu 2:6cd3b0947188 277 {
lixianyu 2:6cd3b0947188 278 return writeBytes(devAddr, regAddr, 1, &data);
lixianyu 2:6cd3b0947188 279 }
lixianyu 2:6cd3b0947188 280
lixianyu 2:6cd3b0947188 281 /** Write single word to a 16-bit device register.
lixianyu 2:6cd3b0947188 282 * @param devAddr I2C slave device address
lixianyu 2:6cd3b0947188 283 * @param regAddr Register address to write to
lixianyu 2:6cd3b0947188 284 * @param data New word value to write
lixianyu 2:6cd3b0947188 285 * @return Status of operation (true = success)
lixianyu 2:6cd3b0947188 286 */
lixianyu 2:6cd3b0947188 287 bool I2Cdev::writeWord(uint8_t devAddr, uint8_t regAddr, uint16_t data)
lixianyu 2:6cd3b0947188 288 {
lixianyu 2:6cd3b0947188 289 return writeWords(devAddr, regAddr, 1, &data);
lixianyu 2:6cd3b0947188 290 }
lixianyu 2:6cd3b0947188 291
lixianyu 2:6cd3b0947188 292 /** Write multiple bytes to an 8-bit device register.
lixianyu 2:6cd3b0947188 293 * @param devAddr I2C slave device address
lixianyu 2:6cd3b0947188 294 * @param regAddr First register address to write to
lixianyu 2:6cd3b0947188 295 * @param length Number of bytes to write
lixianyu 2:6cd3b0947188 296 * @param data Buffer to copy new data from
lixianyu 2:6cd3b0947188 297 * @return Status of operation (true = success)
lixianyu 2:6cd3b0947188 298 */
lixianyu 2:6cd3b0947188 299 bool I2Cdev::writeBytes(uint8_t devAddr, uint8_t regAddr, uint8_t length, uint8_t* data)
lixianyu 2:6cd3b0947188 300 {
lixianyu 2:6cd3b0947188 301 uint8_t i;
lixianyu 2:6cd3b0947188 302 uint8_t *p = buffer;
lixianyu 2:6cd3b0947188 303
lixianyu 2:6cd3b0947188 304 /* Copy address and data to local buffer for burst write */
lixianyu 2:6cd3b0947188 305 *p++ = regAddr;
lixianyu 2:6cd3b0947188 306 for (i = 0; i < length; i++) {
lixianyu 2:6cd3b0947188 307 *p++ = *data++;
lixianyu 2:6cd3b0947188 308 }
lixianyu 2:6cd3b0947188 309 length++;
lixianyu 2:6cd3b0947188 310 /* Send address and data */
lixianyu 2:6cd3b0947188 311 int status = g_i2c.write(devAddr << 1, (char*)buffer, length, false);
lixianyu 2:6cd3b0947188 312 return status == 0;
lixianyu 2:6cd3b0947188 313 }
lixianyu 2:6cd3b0947188 314
lixianyu 2:6cd3b0947188 315 /** Write multiple words to a 16-bit device register.
lixianyu 2:6cd3b0947188 316 * @param devAddr I2C slave device address
lixianyu 2:6cd3b0947188 317 * @param regAddr First register address to write to
lixianyu 2:6cd3b0947188 318 * @param length Number of words to write
lixianyu 2:6cd3b0947188 319 * @param data Buffer to copy new data from
lixianyu 2:6cd3b0947188 320 * @return Status of operation (true = success)
lixianyu 2:6cd3b0947188 321 */
lixianyu 2:6cd3b0947188 322 bool I2Cdev::writeWords(uint8_t devAddr, uint8_t regAddr, uint8_t length, uint16_t* data)
lixianyu 2:6cd3b0947188 323 {
lixianyu 2:6cd3b0947188 324 uint16_t i;
lixianyu 2:6cd3b0947188 325 uint8_t *p = buffer;
lixianyu 2:6cd3b0947188 326 uint16_t realLen = length * 2;
lixianyu 2:6cd3b0947188 327
lixianyu 2:6cd3b0947188 328 /* Copy address and data to local buffer for burst write */
lixianyu 2:6cd3b0947188 329 *p++ = regAddr;
lixianyu 2:6cd3b0947188 330 for (i = 0; i < realLen; i++) {
lixianyu 2:6cd3b0947188 331 *p++ = *data++;
lixianyu 2:6cd3b0947188 332 }
lixianyu 2:6cd3b0947188 333 realLen++;
lixianyu 2:6cd3b0947188 334 /* Send address and data */
lixianyu 2:6cd3b0947188 335 int status = g_i2c.write(devAddr << 1, (char*)buffer, realLen, false);
lixianyu 2:6cd3b0947188 336 return status == 0;
lixianyu 2:6cd3b0947188 337 }