VTI Instruments EX1629, Руководство пользователя

Страница: 339 / 346

www.vtiinstruments.com
EX1629 Onboard Memory 339
if (len < MLANBUFLEN)
{
printf("Error, buffer size not large enough to hold MLAN
response");
return -1;
}
result = vtex1629_read_teds_MLAN(vi, channel, MLANBUFLEN,
receive_packet, &data);
if (result != 0)
{
vtex1629_error_message(vi, result, error);
printf("error when receiving from driver: %s\n", error);
}
else
{
printf("got a packet without errors on receive\n");
PrintPacket(receive_packet);
}
// return the length in bytes of the packet including length byte
return receive_packet[0] + 1;
}
void MLanHostPacketSend(uint8_t *send_packet, int channel)
{
int result = 0;
ViChar error[256];
// add platform/protocol specific code here
result = vtex1629_write_teds_MLAN(vi, channel, (send_packet[0]+1),
send_packet);
if(result != 0)
{
vtex1629_error_message(vi,result,error);
printf("Error sending packet to driver: (%s)\n", error);
}
else
{
printf("sent packet without errors\n");
PrintPacket(send_packet);
}
return;
}
These functions are fairly simple and only act as device-specific wrappers around the sending and
receiving of commands.
Printing Packets
The function that prints the packet is called from the sender & receiver, just to make it easier to
determine which (sender vs. receiver) was doing the printing. Here is the code for the PrintPacket
function.
void PrintPacket(uint8_t* pkt)
{
int len = pkt[0]+1;
int i = 0;
printf("Packet length: %i\n", len);
for (i=0 ; i< len ; i++)