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Need request/response packets for pixy.init and pixy.changeProg

Pixy Software
#1

Hi edge,

I am writing a line following program for the Parallax Propeller 1 and have found that there are no request packets for pixy,init and pixy.changeProg in the Pixy2 Serial Protocol - Packet Reference Documentation.

Shouldn’t there be a changeProg(“line”) Packet Reference in the Line Tracking section of Pixy2 Serial Protocol - Packet Reference Documentation?

Would it be possible for you to provide those two packets in the sendPacket / requests sent to Pixy2 format?

As an example, my code for request version looks like this:

void pixy_request_version() {
clear_buffer();
fdserial_txChar(fdser5_4, ((0xAE) & 0xFF)); //16-bit sync
fdserial_txChar(fdser5_4, ((0xC1) & 0xFF)); //16-bit sync
fdserial_txChar(fdser5_4, ((0x0E) & 0xFF)); //Type of packet 14
fdserial_txChar(fdser5_4, ((0x00) & 0xFF)); //Length of payload 0
pixy_get_response();
extract_version();
}

Or:

int32_t pixy2_getVersion()
{
clearBuffer();

serial_txChar(pixy2, 0xAE);
serial_txChar(pixy2, 0xC1);
serial_txChar(pixy2, REQUEST_VERSION);
serial_txChar(pixy2, 0x00);

recvPacket();

if (validateChecksum() != RESULT_OK) {
return RESULT_CHECKSUM_ERROR;
}
else {
if (response[2] == RESPONSE_VERSION)
return RESULT_OK;
else
return (int32_t)(0xFFFFFF00 | response[2]);
}
}

The pixy.init will obviously not have a payload length, however the pixy.changeProg should have a payload length of 1 and a string “line_tracking”.

Regards,
TCIII

#2

Bump?

So no one at Charmed Labs in the Software Development Section can respond to my request?

Regards,
TCIII

#3

Hello,
It looks like we need to add this to the docs. In the meantime, this file is a good reference:

search for “changeProg”. It essentially details (in code) what is sent.

Hope this helps.

Edward

#4

@edge,

Thanks for the response, much appreciated.

Regards,
TCIII