/** Attempt to synchronize with an Analog Device ARM micro. Sends a
backspace and reads back the microcontrollers response. Performs
multiple retries. Exits the program on error, returns to caller in the
case of success.
*/
static void AnalogDevicesSync(ISP_ENVIRONMENT *IspEnvironment)
{
BINARY sync; /* Holds sync command. */
AD_SYNC_RESPONSE response; /* Response from micro. */
int sync_attempts; /* Number of retries. */
/* Make sure we don't read garbage later instead of the */
/* response we expect from the micro. */
ClearSerialPortBuffers(IspEnvironment);
DebugPrintf(2, "Synchronizing\n"); /* Progress report. */
sync = ANALOG_DEVICES_SYNC_CHAR; /* Build up sync command. */
/* Perform the actual sync attempt. First send the sync */
/* character, the attempt to read back the response. For the */
/* AD ARM micro this is a fixed length block. If response is */
/* received attempt to validate it by comparing the first */
/* characters to those expected. If the received block does */
/* not validate or is incomplete empty the serial buffer and */
/* retry. */
for (sync_attempts = 0; sync_attempts < 5; sync_attempts++)
{
SendComPortBlock(IspEnvironment, &sync, 1);
if (ReceiveComPortBlockComplete(IspEnvironment, &response, sizeof(response),
500) == 0)
{
if (memcmp(response.product_id, ANALOG_DEVICES_SYNC_RESPONSE,
ANALOG_DEVICES_SYNC_SIZE) == 0)
{
return;
}
else
{
DumpString(3, &response, sizeof(response),
"Unexpected response to sync attempt ");
}
}
else
{
DebugPrintf(3, "No (or incomplete) answer on sync attempt\n");
}
ClearSerialPortBuffers(IspEnvironment);
}
DebugPrintf(1, "No (or unacceptable) answer on sync attempt\n");
exit(4);
}
/** Send a previously form Analog Devices communication. Retry a
couple of times if needed but fail by exiting the program if no ACK is
forthcoming.
\param [in] packet the packet to send.
*/
static void AnalogDevicesSendPacket(ISP_ENVIRONMENT *IspEnvironment,
const AD_PACKET * packet)
{
BINARY response;
int retry = 0;
do {
retry++;
/* Make sure we don't read garbage later instead of */
/* the response we expect from the micro. */
ClearSerialPortBuffers(IspEnvironment);
/* Send the packet, the size is the number of data */
/* bytes in the packet plus 3 bytes worth of header */
/* plus checksum. */
SendComPortBlock(IspEnvironment, packet, packet->bytes + 4);
/* Receive the response and check, return to caller */
/* if successful. */
if (ReceiveComPortBlockComplete(IspEnvironment, &response, 1, 5000) == 0)
{
if (response == ANALOG_DEVICES_ACK)
{
DebugPrintf(3, "Packet Sent\n");
return;
}
if (response != ANALOG_DEVICES_NAK)
{
DebugPrintf(3, "Unexpected response to packet (%x)\n", (int)response);
}
DebugPrintf(2, "*");
}
} while (retry < 3);
DebugPrintf(1, "Send packet failed\n");
exit(-1);
}
/** Sends a string out the opened com port.
\param [in] s string to send.
*/
void SendComPort(const char *s)
{
SendComPortBlock(s, strlen(s));
}