Page 1 of 1

new pin diagram really correct ?

Posted: Tue Mar 07, 2017 6:11 pm
by Lutz
@ LattePanda team :
I found your new picture at
http://www.lattepanda.com/docs/#Inputs_and_Outputs

Did you ever check the pin 5 to 8 at the 10-pin-CPU-connector ?
I did an own PCB and found TXD at pin 5 instead pin 6 and RXD at pin 7 instead pin 8 !
Could you please check this connector ?

Re: new pin diagram really correct ?

Posted: Thu Mar 09, 2017 4:06 am
by LattePanda
I've passed this on to investigate, thanks for the feedback.

Re: new pin diagram really correct ?

Posted: Thu Mar 09, 2017 9:00 am
by Gaby
I have some questions with the new design card. How can we know if we have the new or the old design (without testing pin with a test sofware) ?
With this new design, we have 3 additional digital output pins (D17, D18, D19). It could be usefull. But there is 3 pins less if we use analog inputs. It is a pity that there is no Arduino pin in the connector close to the mini USB anymore.

Re: new pin diagram really correct ?

Posted: Thu Mar 09, 2017 9:11 am
by LattePanda
Appreciate your carefulness.
We confirmed with our engineers and according to the layout, the pin order is correct.
Seems the UART_GNSS is used to communicate with GNSS chip and you should use pin 5&7 if you want to link with CPU directly.
Next step, we will do a function test to see if the pin-out is correct , or any wrong description we need fixed.
Any progress I will update in here.

Re: new pin diagram really correct ?

Posted: Thu Mar 09, 2017 9:21 am
by LattePanda
Gaby wrote:I have some questions with the new design card. How can we know if we have the new or the old design (without testing pin with a test sofware) ?
With this new design, we have 3 additional digital output pins (D17, D18, D19). It could be usefull. But there is 3 pins less if we use analog inputs. It is a pity that there is no Arduino pin in the connector close to the mini USB anymore.
Hi, I think we have a mistake on the old pin-out diagram that the D17, D18,D19 actually is A3,A4,A5.in the board
If you still need extra 3 pins, use the 6*3-pin port A0 A1 A2 to have 3 additional digital pins D14 D15 D16

Re: new pin diagram really correct ?

Posted: Thu Mar 09, 2017 10:40 am
by Lutz
LattePanda wrote:Appreciate your carefulness.
We confirmed with our engineers and according to the layout, the pin order is correct.
Seems the UART_GNSS is used to communicate with GNSS chip and you should use pin 5&7 if you want to link with CPU directly.
Next step, we will do a function test to see if the pin-out is correct , or any wrong description we need fixed.
Any progress I will update in here.
This is very interesting...

Here are 2 pictures, one of a part of my PCB. You can see the two red wires to correct the pin connection between header pin 5 - 8 and level shifter U2.
I have some of the first LPs, maybe only the first batch of your PCBs are wrong ?
COM1_PCB__004.jpg
COM1_PCB__004.jpg (238.53 KiB) Viewed 10256 times
This is a screenshot of my communication over LPs COM1
Screen_COM1_001t.JPG
Screen_COM1_001t.JPG (165.04 KiB) Viewed 10256 times
Communication via COM1 thus definitely works with pin 5 + 7.

You certainly understand before I put my PCB in series the problem must be clarified.
http://www.lattepanda.com/forum/viewtop ... 4840#p4840

Re: new pin diagram really correct ?

Posted: Tue Dec 12, 2017 4:45 pm
by Juank
Can I use pines d9, d10 and d11 simultaneously? How?