int
serialReadChunk (
SerialDevice *serial,
void *buffer, size_t *offset, size_t count,
int initialTimeout, int subsequentTimeout
) {
unsigned char *byte = buffer;
const unsigned char *const first = byte;
const unsigned char *const end = first + count;
int timeout = *offset? subsequentTimeout: initialTimeout;
if (!serialFlushAttributes(serial)) return 0;
byte += *offset;
while (byte < end) {
ssize_t result = serialGetData(serial, byte, 1, timeout, subsequentTimeout);
if (!result) {
result = -1;
errno = EAGAIN;
}
if (result == -1) {
if (errno == EINTR) continue;
return 0;
}
byte += 1;
*offset += 1;
timeout = subsequentTimeout;
}
return 1;
}
ssize_t
serialReadData (
SerialDevice *serial,
void *buffer, size_t size,
int initialTimeout, int subsequentTimeout
) {
if (!serialFlushAttributes(serial)) return -1;
return serialGetData(serial, buffer, size, initialTimeout, subsequentTimeout);
}
uint8_t *serialCommand(void *driverVoid, uint16_t transactions, uint32_t *buffer)
{
driver_t *driver = (driver_t *)driverVoid;
serial_port_t *port = (serial_port_t *)driver->driverContext;
uint8_t *returnBuffer = (uint8_t *)malloc(transactions);
if (returnBuffer == NULL) {
return NULL;
}
// Send the transaction data to the serial port
serialPutData(port, transactions * 4, (uint8_t *)buffer);
serialGetData(port, transactions, returnBuffer);
return returnBuffer;
}
