Diagram question

Poul · February 4, 2022, 7:47am

Hi,
In the diagram for PIXY CAM 2 on Github, the WHITE_LED is connected to pin P2_9.

In the file libpixy_m4\led.cpp line 259 the ouput is programmed:
LPC_GPIO_PORT->PIN[1] |= 1<<10;

which in my understanding is pin P1_10. (CAM Y3)
How does that fit?

thanks in advance
regards
Poul

edge · February 4, 2022, 9:12pm

Hello,
I believe the LPC4300 port mappings are made with some kind of output mux, so the physical pin names and gpio port numbers don’t correspond with each other, unless you make them correspond.

Check out this file:

github.com

charmedlabs/pixy2/blob/master/src/device/libpixy_m4/src/platform_config.c

//
// begin license header
//
// This file is part of Pixy CMUcam5 or "Pixy" for short
//
// All Pixy source code is provided under the terms of the
// GNU General Public License v2 (http://www.gnu.org/licenses/gpl-2.0.html).
// Those wishing to use Pixy source code, software and/or
// technologies under different licensing terms should contact us at
// [email protected]. Such licensing terms are available for
// all portions of the Pixy codebase presented here.
//
// end license header
//

#include "lpc43xx.h"
#include "platform_config.h"

#include "lpc43xx_scu.h"
#include "lpc43xx_cgu.h"

This file has been truncated. show original

scu_pinmux() makes the mappings.

Edward