interface to µCAM (microcam)

KevinKK

I tried a lot of ways to read the image from µCAM-TTL, we bought from 4D systems,
http://www.4dsystems.com.au/prod.php?id=75
I have checked all things about wiring, GND, power, RX/TX cross line and baud rate. But still failed.
Here I attached my code , please help me out this project.
uCamTest.spinFullDuplexSerial.spinJDCogSerial.spin

Rayman

I took a quick peek at your code. Didn't see any obvious trouble. Of course, make sure you don't have RX and TX backwards...

I have some code on my website for a different version of a TTL camera. But, your code looks similar to mine, so maybe mine would give you ideas...

kuroneko

The only thing odd is your GetAck sequence. Your're using rxcheck which returns immediately if no character is available. Which means if it's called before $AA is received you're most likely out of sync for the rest of the sequence. It'd be better to keep looking for $AA^A (possibly with timeout) and then evaluate the remaining characters.

^A e.g. repeat until ucam.rx == $AA

KevinKK

We worked it out after several test. What we feel strange is both Prop USB Platform (#32208) and Demo board (#32100) can't support this µCAM anyway. We finally make a new test board with Prop chip, regulator, crystal clock and EEPROM. Attached is the file we test it out.uCamTest_CheckSync_success.spin Anyone who can share the experience of different boards with me ?

prof_braino

Can you show the schematic of the "new test board" that finally worked? A prop is a prop, unless you have special hardware, they should be the same.

KevinKK

I didn't add any other component just follow the Prop manual. You can check the PE plateform http://www.parallax.com/Store/Education/KitsandBoards/tabid/182/ProductID/415/List/1/Default.aspx?SortField=ProductName,ProductName