Diff: I2Cdev.cpp

Revision:

5:8a3cf73d7ed3

Parent:

4:e5018e5ba340

diff -r e5018e5ba340 -r 8a3cf73d7ed3 I2Cdev.cpp
--- a/I2Cdev.cpp	Thu Jun 16 08:12:33 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,339 +0,0 @@
-#if 0
-#include "I2Cdev.h"
-
-extern DigitalOut myled;
-static uint8_t buffer[24];
-//I2C g_i2c1(P0_11, P0_10);
-extern I2C g_i2c;
-
-uint16_t I2Cdev::readTimeout = I2CDEV_DEFAULT_READ_TIMEOUT;
-
-void I2Cdev::init()
-{
-    g_i2c.frequency(267000);
-}
-
-/** Default constructor.
- */
-I2Cdev::I2Cdev()
-{
-    g_i2c.frequency(400000);
-    //myled = 1;
-}
-
-/** Read a single bit from an 8-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register regAddr to read from
- * @param bitNum Bit position to read (0-7)
- * @param data Container for single bit value
- * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
- * @return Status of read operation (true = success)
- */
-int8_t I2Cdev::readBit(uint8_t devAddr, uint8_t regAddr, uint8_t bitNum, uint8_t *data, uint16_t timeout)
-{
-    uint8_t b;
-    uint8_t count = readByte(devAddr, regAddr, &b, timeout);
-    *data = b & (1 << bitNum);
-    return count;
-}
-
-/** Read a single bit from a 16-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register regAddr to read from
- * @param bitNum Bit position to read (0-15)
- * @param data Container for single bit value
- * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
- * @return Status of read operation (true = success)
- */
-int8_t I2Cdev::readBitW(uint8_t devAddr, uint8_t regAddr, uint8_t bitNum, uint16_t *data, uint16_t timeout)
-{
-    uint16_t b;
-    uint8_t count = readWord(devAddr, regAddr, &b, timeout);
-    *data = b & (1 << bitNum);
-    return count;
-}
-
-/** Read multiple bits from an 8-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register regAddr to read from
- * @param bitStart First bit position to read (0-7)
- * @param length Number of bits to read (not more than 8)
- * @param data Container for right-aligned value (i.e. '101' read from any bitStart position will equal 0x05)
- * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
- * @return Status of read operation (true = success)
- */
-int8_t I2Cdev::readBits(uint8_t devAddr, uint8_t regAddr, uint8_t bitStart, uint8_t length, uint8_t *data, uint16_t timeout)
-{
-    // 01101001 read byte
-    // 76543210 bit numbers
-    //    xxx   args: bitStart=4, length=3
-    //    010   masked
-    //   -> 010 shifted
-    uint8_t count, b;
-    if ((count = readByte(devAddr, regAddr, &b, timeout)) != 0) {
-        uint8_t mask = ((1 << length) - 1) << (bitStart - length + 1);
-        b &= mask;
-        b >>= (bitStart - length + 1);
-        *data = b;
-    }
-    return count;
-}
-
-/** Read multiple bits from a 16-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register regAddr to read from
- * @param bitStart First bit position to read (0-15)
- * @param length Number of bits to read (not more than 16)
- * @param data Container for right-aligned value (i.e. '101' read from any bitStart position will equal 0x05)
- * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
- * @return Status of read operation (1 = success, 0 = failure, -1 = timeout)
- */
-int8_t I2Cdev::readBitsW(uint8_t devAddr, uint8_t regAddr, uint8_t bitStart, uint8_t length, uint16_t *data, uint16_t timeout)
-{
-    // 1101011001101001 read byte
-    // fedcba9876543210 bit numbers
-    //    xxx           args: bitStart=12, length=3
-    //    010           masked
-    //           -> 010 shifted
-    uint8_t count;
-    uint16_t w;
-    if ((count = readWord(devAddr, regAddr, &w, timeout)) != 0) {
-        uint16_t mask = ((1 << length) - 1) << (bitStart - length + 1);
-        w &= mask;
-        w >>= (bitStart - length + 1);
-        *data = w;
-    }
-    return count;
-}
-
-/** Read single byte from an 8-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register regAddr to read from
- * @param data Container for byte value read from device
- * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
- * @return Status of read operation (true = success)
- */
-int8_t I2Cdev::readByte(uint8_t devAddr, uint8_t regAddr, uint8_t *data, uint16_t timeout)
-{
-    return readBytes(devAddr, regAddr, 1, data, timeout);
-}
-
-/** Read single word from a 16-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register regAddr to read from
- * @param data Container for word value read from device
- * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
- * @return Status of read operation (true = success)
- */
-int8_t I2Cdev::readWord(uint8_t devAddr, uint8_t regAddr, uint16_t *data, uint16_t timeout)
-{
-    return readWords(devAddr, regAddr, 1, data, timeout);
-}
-
-/** Read multiple bytes from an 8-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr First register regAddr to read from
- * @param length Number of bytes to read
- * @param data Buffer to store read data in
- * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
- * @return Number of bytes read (-1 indicates failure)
- */
-int8_t I2Cdev::readBytes(uint8_t devAddr, uint8_t regAddr, uint8_t length, uint8_t *data, uint16_t timeout)
-{
-    g_i2c.write(devAddr << 1, (char*)&regAddr, 1, false);
-    uint8_t realReadAddr = (devAddr << 1) | 0x01;
-    int retRead = g_i2c.read(realReadAddr, (char*)data, length);
-    if (retRead == 0) {
-        return length;
-    }
-    return -1;
-}
-
-int8_t I2Cdev::readBytesOnly(uint8_t devAddr, uint8_t length, uint8_t *data, uint16_t timeout)
-{
-    uint8_t realReadAddr = (devAddr << 1) | 0x01;
-    int retRead = g_i2c.read(realReadAddr, (char*)data, length);
-    if (retRead == 0) {
-        return length;
-    }
-    return -1;
-}
-
-/** Read multiple words from a 16-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr First register regAddr to read from
- * @param length Number of words to read
- * @param data Buffer to store read data in
- * @param timeout Optional read timeout in milliseconds (0 to disable, leave off to use default class value in I2Cdev::readTimeout)
- * @return Number of words read (0 indicates failure)
- */
-int8_t I2Cdev::readWords(uint8_t devAddr, uint8_t regAddr, uint8_t length, uint16_t *data, uint16_t timeout)
-{
-    g_i2c.write(devAddr << 1, (char*)&regAddr, 1, false);
-    uint8_t realReadAddr = (devAddr << 1) | 0x01;
-    int retRead = g_i2c.read(realReadAddr, (char*)data, length*2);
-    if (retRead == 0) {
-        return length;
-    }
-    return 0;
-}
-
-/** write a single bit in an 8-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register regAddr to write to
- * @param bitNum Bit position to write (0-7)
- * @param value New bit value to write
- * @return Status of operation (true = success)
- */
-bool I2Cdev::writeBit(uint8_t devAddr, uint8_t regAddr, uint8_t bitNum, uint8_t data)
-{
-    uint8_t b;
-    readByte(devAddr, regAddr, &b);
-    b = (data != 0) ? (b | (1 << bitNum)) : (b & ~(1 << bitNum));
-    return writeByte(devAddr, regAddr, b);
-}
-
-/** write a single bit in a 16-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register regAddr to write to
- * @param bitNum Bit position to write (0-15)
- * @param value New bit value to write
- * @return Status of operation (true = success)
- */
-bool I2Cdev::writeBitW(uint8_t devAddr, uint8_t regAddr, uint8_t bitNum, uint16_t data)
-{
-    uint16_t w;
-    readWord(devAddr, regAddr, &w);
-    w = (data != 0) ? (w | (1 << bitNum)) : (w & ~(1 << bitNum));
-    return writeWord(devAddr, regAddr, w);
-}
-
-/** Write multiple bits in an 8-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register regAddr to write to
- * @param bitStart First bit position to write (0-7)
- * @param length Number of bits to write (not more than 8)
- * @param data Right-aligned value to write
- * @return Status of operation (true = success)
- */
-bool I2Cdev::writeBits(uint8_t devAddr, uint8_t regAddr, uint8_t bitStart, uint8_t length, uint8_t data)
-{
-    //      010 value to write
-    // 76543210 bit numbers
-    //    xxx   args: bitStart=4, length=3
-    // 00011100 mask byte
-    // 10101111 original value (sample)
-    // 10100011 original & ~mask
-    // 10101011 masked | value
-    uint8_t b;
-    if (readByte(devAddr, regAddr, &b) != 0) {
-        uint8_t mask = ((1 << length) - 1) << (bitStart - length + 1);
-        data <<= (bitStart - length + 1); // shift data into correct position
-        data &= mask; // zero all non-important bits in data
-        b &= ~(mask); // zero all important bits in existing byte
-        b |= data; // combine data with existing byte
-        return writeByte(devAddr, regAddr, b);
-    } else {
-        return false;
-    }
-}
-
-/** Write multiple bits in a 16-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register regAddr to write to
- * @param bitStart First bit position to write (0-15)
- * @param length Number of bits to write (not more than 16)
- * @param data Right-aligned value to write
- * @return Status of operation (true = success)
- */
-bool I2Cdev::writeBitsW(uint8_t devAddr, uint8_t regAddr, uint8_t bitStart, uint8_t length, uint16_t data)
-{
-    //              010 value to write
-    // fedcba9876543210 bit numbers
-    //    xxx           args: bitStart=12, length=3
-    // 0001110000000000 mask byte
-    // 1010111110010110 original value (sample)
-    // 1010001110010110 original & ~mask
-    // 1010101110010110 masked | value
-    uint16_t w;
-    if (readWord(devAddr, regAddr, &w) != 0) {
-        uint8_t mask = ((1 << length) - 1) << (bitStart - length + 1);
-        data <<= (bitStart - length + 1); // shift data into correct position
-        data &= mask; // zero all non-important bits in data
-        w &= ~(mask); // zero all important bits in existing word
-        w |= data; // combine data with existing word
-        return writeWord(devAddr, regAddr, w);
-    } else {
-        return false;
-    }
-}
-
-/** Write single byte to an 8-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register address to write to
- * @param data New byte value to write
- * @return Status of operation (true = success)
- */
-bool I2Cdev::writeByte(uint8_t devAddr, uint8_t regAddr, uint8_t data)
-{
-    return writeBytes(devAddr, regAddr, 1, &data);
-}
-
-/** Write single word to a 16-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr Register address to write to
- * @param data New word value to write
- * @return Status of operation (true = success)
- */
-bool I2Cdev::writeWord(uint8_t devAddr, uint8_t regAddr, uint16_t data)
-{
-    return writeWords(devAddr, regAddr, 1, &data);
-}
-
-/** Write multiple bytes to an 8-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr First register address to write to
- * @param length Number of bytes to write
- * @param data Buffer to copy new data from
- * @return Status of operation (true = success)
- */
-bool I2Cdev::writeBytes(uint8_t devAddr, uint8_t regAddr, uint8_t length, uint8_t* data)
-{
-    uint8_t i;
-    uint8_t *p = buffer;
-
-    /* Copy address and data to local buffer for burst write */
-    *p++ = regAddr;
-    for (i = 0; i < length; i++) {
-        *p++ = *data++;
-    }
-    length++;
-    /* Send address and data */
-    int status = g_i2c.write(devAddr << 1, (char*)buffer, length, false);
-    return status == 0;
-}
-
-/** Write multiple words to a 16-bit device register.
- * @param devAddr I2C slave device address
- * @param regAddr First register address to write to
- * @param length Number of words to write
- * @param data Buffer to copy new data from
- * @return Status of operation (true = success)
- */
-bool I2Cdev::writeWords(uint8_t devAddr, uint8_t regAddr, uint8_t length, uint16_t* data)
-{
-    uint16_t i;
-    uint8_t *p = buffer;
-    uint16_t realLen = length * 2;
-
-    /* Copy address and data to local buffer for burst write */
-    *p++ = regAddr;
-    for (i = 0; i < realLen; i++) {
-        *p++ = *data++;
-    }
-    realLen++;
-    /* Send address and data */
-    int status = g_i2c.write(devAddr << 1, (char*)buffer, realLen, false);
-    return status == 0;
-}
-#endif
\ No newline at end of file