/*********************************************************************
* @fn hali2cReceive
* @brief reads data into a buffer
* @param address: linear address on part from which to read
* @param buffer: target array for read characters
* @param len: max number of characters to read
* @return void
*/
STATIC void hali2cReceive( uint8 address, uint8 *buffer, uint16 len )
{
//uint8 ch;
uint16 i;
if (!len) {
return;
}
hali2cSendDeviceAddress(address);
//ch = OCM_ADDRESS_BYTE(0, OCM_READ);
//hali2cSend(&ch, 1, SEND_START, NOSEND_STOP);
for ( i = 0; i < len-1; i++ )
{
// SCL may be high. set SCL low. If SDA goes high when input
// mode is set the slave won't see a STOP
hali2cClock(0);
OCM_DATA_HIGH();
buffer[i] = hali2cReceiveByte();
hali2cWrite(SMB_ACK); // write leaves SCL high
}
// condition SDA one more time...
hali2cClock(0);
OCM_DATA_HIGH();
buffer[i] = hali2cReceiveByte();
hali2cWrite(SMB_NAK);
hali2cStop();
}
/*****************************************************************************
*
*
* Read ADXL345
*/
byte ADXL345ReadByte(byte address)
{
// address and W/R bit
byte firstByte = 0x00;
// reserve the read byte
byte value = 0x00;
// wait turns to receive the slave ack
uint8 retry = HAL_I2C_RETRY_CNT;
// Send the start condition
hali2cStart();
// Send the slave address and wirte bit
firstByte = 0xA6;
do {
if ( hali2cSendByte(firstByte) ) // takes care of ack polling
{
retry = HAL_I2C_RETRY_CNT;
break;
}
} while ( --retry );
// Send the reg address
do {
if ( hali2cSendByte(address) ) // takes care of ack polling
{
retry = HAL_I2C_RETRY_CNT;
break;
}
} while ( --retry );
// Send the start condition again
hali2cStart();
// Send the slave address and read bit
firstByte = 0xA7;
do {
if ( hali2cSendByte(firstByte) ) // takes care of ack polling
{
retry = HAL_I2C_RETRY_CNT;
break;
}
} while ( --retry );
// Read a byte from ADXL345
value = hali2cReceiveByte();
// write NACK
hali2cWrite(SMB_NAK);
// Send stop condition
hali2cStop();
return value;
}
// EEPROM READ byte
uint8_t hali2cRead_byte( uint8 devaddr, uint16 regaddr )
{
uint8_t d = 0;
hali2cSendDeviceAddress((devaddr<<1) | OCM_WRITE);
// send internal eeprom addres (0 - 0x1fff)
hali2cSendByte(regaddr >> 8);
hali2cSendByte(regaddr & 0xff);
hali2cStart();
hali2cSendDeviceAddress((devaddr<<1) | OCM_READ);
d = hali2cReceiveByte();
hali2cWrite(SMB_NAK);
hali2cStop();
return d;
}
void ADXL345ReadBytes(uint8 startAddr, uint8* buffer, uint8 len)
{
// wait turns to receive the slave ack
uint8 retry = HAL_I2C_RETRY_CNT;
// 7-bit address and W/R bit
byte firstByte = 0x00;
byte i = 0;
// Send start condition
hali2cStart();
// Send the slave address and wirte bit
firstByte = 0xA6; // seven-bit slave address and write bit '0', 0x1111_1110
do {
if ( hali2cSendByte(firstByte) ) // takes care of ack polling
{
retry = HAL_I2C_RETRY_CNT;
break;
}
} while ( --retry );
// Send the reg address
do {
if ( hali2cSendByte(startAddr) ) // takes care of ack polling
{
retry = HAL_I2C_RETRY_CNT;
break;
}
} while ( --retry );
// this is the repeat start condition
hali2cStart();
// Send the slave address and read bit
firstByte = 0xA7;
do {
if ( hali2cSendByte(firstByte) ) // takes care of ack polling
{
retry = HAL_I2C_RETRY_CNT;
break;
}
} while ( --retry );
// read several bytes
for ( i = 0; i<len-1; i++ )
{
// SCL may be high. set SCL low. If SDA goes high when input
// mode is set the slave won't see a STOP
hali2cClock(0);
OCM_DATA_HIGH();
buffer[i] = hali2cReceiveByte();
hali2cWrite(SMB_ACK); // write leaves SCL high
}
// condition SDA one more time...
// hali2cClock(0);
// OCM_DATA_HIGH();
// buffer[i] = hali2cReceiveByte();
// hali2cWrite(SMB_NAK);
// Send stop condition
hali2cStop();
}
