Introduction toPIC-C

Installing PIC-C

Goto http://sw.e-cpe.org/ Username/pass = guest/cpecmu Download and install:

IDEUTIL PCWHD You need the files in registry.zip to register

Installing Supporting Sotware GoGo Firmware Downloader

http://www.gogoboard.org – download page

Putty http://files.e-cpe.org/gogo

Topics you need to learn

Simple “hello world” Basic I/O, Sensors, Output Control Interrupts

Timer I/O Other

I2C Bus

1. Writing a“Hello world” programYou will need to

Configure RS232 on the PIC using the PIC Wizard

Write a simple C program Compile the source to generate a HEX file Download the HEX file to the PIC using the

firmware downloader Use putty to view the output of your program

Reflection

What is the spec of your PIC? RAM, EEPROM, Clock Speed

How much ROM/RAM did your program use?

Using PIC-C’s help

2. BASIC I/O

Write a program to blink the USER LED

Turn on the USER_LED only when the RUN BUTTON is pressed

Make the board “BEEP”

Using Sensors (Analog input):Control the USER_LED with a light sensor Setting up your sensor ports using:

#device adc=10

setup_adc_ports(ALL_ANALOG);

setup_adc(ADC_CLOCK_INTERNAL);

Read from a sensor port using:set_adc_channel(2); // channel = 0-7delay_us(10); // wait for ADC to stabilize

value = read_adc();

Exercise II

Write a program that allows the user to turn on/off the USER_LED or BEEP by typing the following commands in putty: ON OFF BEEP