port_read_write/main.c

===== Description =====

This demo shows how to read and write port pins of a Netcruzer Single Board Computer. All ports on Netcruzer boards are named 0 - 41 (old names used to be T0 to T7, Y0 to Y11 and X0 to X11). For details how they map to the Microcontroller port pins, see modtronix.com/product/sbc66ec/ For this demo, connect a LED to port 38 (old port name Y8) (anode to port 38, cathode to 0V via a 1k resistor), and a button to port 34 (old port name Y4) (other side of button to 0V). This example will continuously check the state of the button input. When the button is pressed, it will turn on the LED on port 38 (old port name Y8). When not pressed, it will turn off the LED.

===== Required Hardware =====

This project can be run on any of our SBC66 Netcruzer boards. For prototyping, we recommend combining this board with a Prototyping Board, like the PT66ECI for example. This low cost prototyping board makes all the I/O ports of the SBC66 board available via marked labels on the PCB. It also provides a reset and firmware button that simplifies prototyping.

===== Building Project =====

This project is located in the "src/demos/io/port_read_write" folder of the Netcruzer Download. To compile for Netcruzer Board, open this project in MPLAB X, and select the "Project Configuration" for desired board. For example "SBC66ECL_R2" for the SBC66ECL Revision 2 board. For details click here

===== Programming Board =====

After compiling (build), the board can be programmed via the USB Bootloader or a PIC Programmer. USB Programming is simplified when using the SBC board together with a Prototype Board.

===== File History =====

2012-08-08, David H. (DH):

• Initial version

#define THIS_IS_MAIN_FILE   //Uniquely identifies this as the file with the main application entry function main()

#include "HardwareProfile.h"            //Required for all Netcruzer projects


int main(void)
{
    //Declare all timers, and initiaze with current timer value (tick16Get...() functions)
    WORD tmrFlashLed = tick16Get();     //Timer for flashing system LED

    nzSysInitDefault();         //Default initialization. All ports inputs. All analog features disabled. Tick 1ms

    DIR_SYSLED = OUTPUT_PIN;    //Set System LED port=outputs. Setting DIR_xxx to 1 set's port to input, and 0 as output

    //We want to connect a button to port 34 (old port name Y4). When pressed, it will pull port 34 to 0 (connect to 0V). Enable pull-up
    //resistor so when button not pressed, port is 1
    DIR_34 = INPUT_PIN;         //Configure Port 34 (old port name Y4) to be an input
    PULLUP_34 = 1;              //Enable pull-up resistors on port 34 (old port name Y4)

    //Connect a LED to port 38 (old port name Y8), and configure as output pin. Connect anode (+) to port 38, and cathode to 0V via
    //a 1k resistor.
    DIR_38 = OUTPUT_PIN;

    while(1)
    {
        //If button on port 34 (old port name Y4) is pressed, turn LED on port 38 (old port name Y8) on. Else, LED is off
        if (PIN_34 == 0) {
            LAT_38 = 1; //If button on port 34 (old port name Y4) is pressed, turn LED on port 38 (Y8) on. Set port 38 to 1 (3.3V)
        }
        else {
            LAT_38 = 0; //If button on port 34 (old port name Y4) NOT pressed, turn LED on port 38 (Y8) off. Set Y8 to 0 (0V)
        }

        //Flash system LED every 500ms
        if (tick16TestTmr(tmrFlashLed)) {
            tick16UpdateTmrMS(tmrFlashLed, 500); //Update timer to expire in 500ms again
            LAT_SYSLED = !LAT_SYSLED;       //Toggle System LED
        }
    }//end while

    return 0;
}//end main