status_t I2C_MasterTransferBlocking(I2C_Type *base, i2c_master_transfer_t *xfer)
{
status_t result = kStatus_Success;
uint32_t subaddress;
uint8_t subaddrBuf[4];
int i;
assert(xfer);
/* If repeated start is requested, send repeated start. */
if (!(xfer->flags & kI2C_TransferNoStartFlag))
{
if (xfer->subaddressSize)
{
result = I2C_MasterStart(base, xfer->slaveAddress, kI2C_Write);
if (result == kStatus_Success)
{
/* Prepare subaddress transmit buffer, most significant byte is stored at the lowest address */
subaddress = xfer->subaddress;
for (i = xfer->subaddressSize - 1; i >= 0; i--)
{
subaddrBuf[i] = subaddress & 0xff;
subaddress >>= 8;
}
/* Send subaddress. */
result = I2C_MasterWriteBlocking(base, subaddrBuf, xfer->subaddressSize, kI2C_TransferNoStopFlag);
if ((result == kStatus_Success) && (xfer->direction == kI2C_Read))
{
result = I2C_MasterRepeatedStart(base, xfer->slaveAddress, xfer->direction);
}
}
}
int i2c_byte_write(i2c_t *obj, int data) {
if (I2C_MasterWriteBlocking(i2c_addrs[obj->instance], (uint8_t *)(&data), 1) == kStatus_Success) {
return 1;
}
return 0;
}
