I am writing code for serial programming for serial communication between FTDI device and Desktop through XBEE.
I am writing command on device for (in example) reading Battery Voltage Current and Temp.
Command is stored in TxBuffer and I am storing response in RxBuffer. Before Storing I am checking how many bytes I have to read by using FT_Getqueuestatus which is coming 8 bytes but when I am reading using FT_Read and storing in RxBuffer its only reading 4 bytes. Plz Help me in this..
RxBuffer should be- 4642442300VIT
where V-Voltage
I-Current
T-Temp.
but It is reading only 46424423
Code
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <string.h>
#include <unistd.h>
#include "../../ftd2xx.h"
int main(int argc, char *argv[])
{
FT_STATUS ftStatus;
FT_HANDLE ftHandle;
DWORD BytesWritten;
DWORD EventDWord;
DWORD TxBytes;
DWORD RxBytes;
DWORD BytesReceived;
DWORD libraryVersion = 0;
int iport,len,i;
char RxBuffer[256]="\0",outword[40];
char TxBuffer[]="\x4E\x45\x58\x23\x00\r\n"; // Contains data to write to device
ftStatus = FT_GetLibraryVersion(&libraryVersion);
if (ftStatus == FT_OK)
{
printf("Library version = 0x%x\n", (unsigned int)libraryVersion);
}
else
{
printf("Error reading library version.\n");
return 1;
}
if(argc > 1) {
sscanf(argv[1], "%d", &iport);
}
else {
iport = 0;
}
printf("Opening port %d\n", iport);
ftStatus = FT_Open(iport, &ftHandle);
if(ftStatus != FT_OK) {
/*
This can fail if the ftdi_sio driver is loaded
use lsmod to check this and rmmod ftdi_sio to remove
also rmmod usbserial
*/
printf("FT_Open(%d) failed\n", iport);
return 1;
}
printf("FT_Open succeeded. Handle is %p\n", ftHandle);
ftStatus = FT_SetBaudRate(ftHandle, 57600); // Set baud rate to 115200
if (ftStatus == FT_OK) {
printf("\nFT_SetBaudRate OK");
}
else {
printf("\nFT_SetBaudRate Failed");
}
// Set 8 data bits, 1 stop bit and no parity
ftStatus = FT_SetDataCharacteristics(ftHandle, FT_BITS_8, FT_STOP_BITS_1,
FT_PARITY_NONE);
if (ftStatus == FT_OK) {
printf("\nFT_SetDataCharacteristics OK");
}
else {
printf("\nFT_SetDataCharacteristics Failed");
}
ftStatus = FT_Purge(ftHandle, FT_PURGE_RX | FT_PURGE_TX); // Purge both Rx and Tx buffers
if (ftStatus == FT_OK) {
printf("\nFT_Purge OK");
}
else {
printf("\nFT_Purge failed");
}
sleep(1);
ftStatus = FT_Write(ftHandle, TxBuffer, sizeof(TxBuffer), &BytesWritten);
if (ftStatus == FT_OK) {
printf("\nFT_Write OK");
}
else {
printf("\nFT_Write Failed");
}
sleep(1);
FT_SetTimeouts(ftHandle,5000,0);
//FT_GetStatus(ftHandle,&RxBytes,&TxBytes,&EventDWord);
FT_GetQueueStatus(ftHandle,&RxBytes);
if (RxBytes > 0) {
ftStatus = FT_Read(ftHandle,RxBuffer,RxBytes,&BytesReceived);
printf("\n\n\n%d\n\n\n",BytesReceived);
if (ftStatus == FT_OK && RxBytes == BytesReceived) {
len = strlen(RxBuffer);
printf("\n\n\nlen=%d %d",RxBytes,len);
if(RxBuffer[len-1]=='\n')
RxBuffer[--len] = '\0';
for(i = 0; i<len; i++){
sprintf(outword+i*2, "%02X", RxBuffer[i]);
}
//printf("%s\n", outword);
printf("\nFT_Read OK--Data-- %s",outword);
}
else {
printf("\nFT_Read Failed");
}
}
FT_Close(ftHandle);
return 0;
}