uint8_t DFTwoWire::requestFrom(uint8_t address, uint8_t quantity, uint8_t sendStop)
{
if (quantity > BUFFER_LENGTH)
quantity = BUFFER_LENGTH;
/* Set slave address via ioctl */
i2c_setslave(i2c_fd, address);
if(i2c_transfer) {
/* Need to perform a combined read/write operation
*/
i2c_transfer = 0;
if (sendStop == false)
return 0;
i2c_add_to_buf(address, 1, rxBuffer, quantity);
if (!i2c_readwrite(i2c_fd)) {
rxBufferIndex = 0;
rxBufferLength = quantity;
i2c_transfer = 0;
return quantity;
} else
return 0;
}
if (i2c_readbytes(i2c_fd, rxBuffer, quantity) < 0)
return 0;
// set rx buffer iterator vars
rxBufferIndex = 0;
rxBufferLength = quantity;
return quantity;
}
I2CError i2c_tx(int bus, int iicaddr, void* buffer, int len) {
I2C[bus].address = iicaddr;
I2C[bus].is_write = TRUE;
I2C[bus].registers = ((uint8_t*) buffer);
I2C[bus].buffer = ((uint8_t*) (buffer))+1;
I2C[bus].bufferLen = len-1;
return i2c_readwrite(&I2C[bus]);
}
I2CError i2c_rx(int bus, int iicaddr, const uint8_t* registers, int num_regs, void* buffer, int len) {
if (num_regs != 1)
return 1;
I2C[bus].address = iicaddr;
I2C[bus].is_write = FALSE;
I2C[bus].registers = registers;
I2C[bus].bufferLen = len;
I2C[bus].buffer = (uint8_t*) buffer;
return i2c_readwrite(&I2C[bus]);
}
int i2c_write(unsigned bus, unsigned chip, unsigned addr,
unsigned alen, const uint8_t *buf, unsigned len)
{
return i2c_readwrite(bus, chip, addr, alen, (void *)buf, len, 0);
}
int i2c_read(unsigned bus, unsigned chip, unsigned addr,
unsigned alen, uint8_t *buf, unsigned len)
{
return i2c_readwrite(bus, chip, addr, alen, buf, len, 1);
}
