Estou escrevendo código para programação serial para comunicação serial entre o dispositivo FTDI e o Desktop através do XBEE.
Estou escrevendo o comando no dispositivo para (no exemplo) ler a corrente e a voltagem da bateria.
O comando é armazenado em TxBuffer e eu estou armazenando a resposta em RxBuffer . Antes de armazenar Estou verificando quantos bytes devo ler usando FT_Getqueuestatus que está chegando 8 bytes , mas quando estou lendo usando FT_Read e armazenando em RxBuffer a sua única leitura 4 bytes. Plz Ajude-me nisso ..
RxBuffer deve ser: 4642442300VIT
onde V-Voltage
I-Current
T-Temp.
mas está lendo apenas 46424423
Código
#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]="#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]="%pre%",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] = '%pre%';
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;
}
",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] = '%pre%';
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;
}
Tenho resposta.
Sinse Eu estava armazenando Response em String e o sub-comando contém 00, que não é nada, mas é por isso que termina. Para superar este problema estou lendo de Buffer até RxBytes, que não é nada, mas não. de bytes recebidos do buffer.
Tags gcc c serial-port