/*****************************************************************************
*
*
* 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;
}
/*********************************************************************
* @fn hali2cSend
* @brief Sends buffer contents to SM-Bus device
* @param buffer - ptr to buffered data to send
* @param len - number of bytes in buffer
* @param sendStart - whether or not to send start condition.
* @param sendStop - whether or not to send stop condition.
* @return void
*/
STATIC void hali2cSend( uint8 *buffer, uint16 len, uint8 sendStart, uint8 sendStop )
{
uint16 i;
uint8 retry = HAL_I2C_RETRY_CNT;
if (!len) {
return;
}
if (sendStart == SEND_START) {
hali2cStart();
}
for ( i = 0; i < len; i++ )
{
do {
if ( hali2cSendByte( buffer[i] ) ) // takes care of ack polling
{
break;
}
} while ( --retry );
}
if (sendStop == SEND_STOP) {
hali2cStop();
}
}
// Wait for Finish EEPROM WRITE operation
uint8_t hali2c_acknowledge_write_polling(uint8_t devaddr)
{
uint8_t rc;
do{
hali2cStart();
rc = hali2cSendByte((devaddr<<1) | OCM_WRITE);
}while (!rc);
return 0;
}
/*********************************************************************
* @fn hali2cSendDeviceAddress
* @brief Send onlythe device address. Do ack polling
*
* @param void
* @return none
*/
STATIC void hali2cSendDeviceAddress(uint8 address)
{
uint8 retry = HAL_I2C_RETRY_CNT;
do {
hali2cStart();
if (hali2cSendByte(address)) // do ack polling...
{
break;
}
} while ( --retry );
}
// 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;
}
/////////////////////////////////////////////////////////////
// ADXL345 Vibrate Sensor
//STATIC void hali2cSend( uint8 *buffer, uint16 len, uint8 sendStart, uint8 sendStop );
//STATIC _Bool hali2cSendByte( uint8 dByte );
//STATIC void hali2cWrite( bool dBit );
//STATIC void hali2cClock( bool dir );
//STATIC void hali2cStart( void );
//STATIC void hali2cStop( void );
//STATIC void hali2cReceive( uint8 address, uint8 *buffer, uint16 len );
//STATIC uint8 hali2cReceiveByte( void );
//STATIC _Bool hali2cRead( void );
//STATIC void hali2cSendDeviceAddress(uint8 address);
void ADXL345WriteByte(byte address, byte value)
{
// Address and W/R bit
byte firstByte = 0x00;
// wait turns to receive the slave ack
uint8 retry = HAL_I2C_RETRY_CNT;
// Send the start condition
hali2cStart();
// Send the slave address + w flag
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 value
do {
if ( hali2cSendByte(value) ) // takes care of ack polling
{
break;
}
} while ( --retry );
// Send stop condition
hali2cStop();
}
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();
}