I can send the “Capture Frame VGA” command to the Electronic brick camera using a Gumstix, but I haven’t been able to get a response. (I proved this using an oscilloscope to probe TXD and RXD)
More info on the camera:
garden.seeedstudio.com/index.php … MOS_Camera
Here is my code:
int main()
{
int i;
int b=0;
system(“stty -F /dev/ttyS2 ispeed 115200 cs8 -cstopb -brkint -icrnl -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke -parenb”);
// open serial port connected to camera
openPort();
// initialize camera and request version info
printf(“Initialize camera for hex commands…\n”);
byteTx(0x55);
byteTx(0x41);
byteTx(0x52);
byteTx(0x54);
byteTx(0xCA);
byteTx(0x00);
byteTx(0x00);
byteTx(0x00);
byteTx(0x00);
byteTx(0x00);
byteTx(0x00);
while(1)
{
b = byteRx(buf, 1, 3);// != 3)
printBuf(buf);
printf("bytes read = %d\n", b);
byteTx(0x55);
byteTx(0x41);
byteTx(0x52);
byteTx(0x54);
byteTx(0xCA);
byteTx(0x00);
byteTx(0x00);
byteTx(0x00);
byteTx(0x00);
byteTx(0x00);
byteTx(0x00);
b = 0;
}
// print network information
printBuf(buf);
// close serial port connected to GSM module
closePort();
}
void byteTx(char value)
{
char* buffer;
buffer = &value;
write(fd, buffer, 1);
printf(“value sent: %x \n”, *buffer);
}
/**
- byteRx()
- Reads a byte from the camera over the serial interface.
- @arg buffer a character pointer to the buffer which will
-
store the received data. - @arg nbytes an int expressing the number of bytes to read.
- @arg iter an int expressing the number of times to receive
-
nbytes. -
@return int - how many bytes were read
/
int byteRx(char buffer, int nbytes, int iter)
{
int i;
int bytesRead = 0;
printf(“about to read…\n”);
for(i = 0; i < iter; i++)
{
if((bytesRead = read(fd, buffer, nbytes)) == ERROR)
{
printf(“error reading\n”);
return bytesRead;
}
buffer = buffer + nbytes;
printf(“read\n”);
}
return bytesRead;
}
/**
- openPort()
- Opens ttyS2 port to write to camera.
-
@return -1 if port failed to open and 0 if port successfuly opens
*/
int openPort()
{
fd = open("/dev/ttyS2", O_RDWR | O_NONBLOCK);
if (!fd)
{
printf(“File failed to open \n”);
return 0;
}
printf(“File successfully opened with descriptor, fd = %d.\n”, fd);
return fd;
}
/**
- closePort()
- Closes serial port to the camera.
-
@return 1 if successful, -1 if failed.
*/
int closePort()
{
if(!close(fd))
{
printf(“file successfully closed \n”);
return 1;
}
else
return -1;
}