ME333 Sample Code

Simple PIC

• simplePIC.c: Flashes LEDs on the NU32 unless the USER button is pressed.

NU32 library, header file, procdefs, and terminal comm test

• NU32.c: NU32 board library.
• NU32.h: NU32 header file.
• procdefs.ld: Linker file for NU32.
• NU32_serial_comm.c: Serial communication test with the terminal.
• NU32_serial_plot.c: Plot data with serial communication in NU32_Utility.

Interrupts

• INT_core_timer.c: Interrupt on core timer period match.
• INT_ext_int.c: Interrupt on rising edge of external interrupt line INT0.

Digital I/O

• DIGIO_sfrs.c: Digital I/O and change notification using SFR manipulation.
• DIGIO_plib.c: Digital I/O and change notification using the peripheral library.

Counter/timer

• TMR_16bit.c: Set up a 16-bit timer to count the PBCLK.
• TMR_16bit_external_clocks.c: Count two external clock sources, such as the A and B channel from a motor encoder.

LCD code

• LCD.c: LCD library.
• LCD.h: LCD header file.
• LCDtest.c: Test program for LCD library.

Output compare (PWM)

• OC_PWM_nolib.c: Set up PWM by setting SFRs.
• OC_PWM_lib.c: Set up PWM using peripheral library functions.
• OC_square_wave.c: Alternate between two different PWM duty cycles at 1 Hz. PWM is at 100 kHz and can be low-pass filtered to get a square wave analog output.

Analog to digital

• ADC_Read2.c: Reads two analog inputs repetitively and prints the results to the user's terminal.
• ADC_Read2_LCD.c Reads two analog inputs repetitively and prints the results to the LCD.

Using RS232

• Simple UART communication
• UART with hardware flow control

Using SPI

• MCP4922 12bit SPI DAC
• MCP3008 10bit SPI ADC
• Microchip 23k256 256kbit SPI SRAM

Using I2C

• MAX518 8bit I2C DAC
• NAU7802 24bit I2C ADC
• PCF8570 2kbit I2C SRAM

Programming the on board flash

• Flash self programming

Using the RTCC

• Keeping time

Using CAN

• Creating a CAN bus

Applications

DSP and FFT

• DSP_sample_square_wave.zip: Examples of FIR and FFT in both MATLAB and on the PIC32.
• DSP_mips32_fft.zip: Example of using the Q31 mips library for FFT. Contains a C source file and a header file.

Reading a quadrature encoder with the dsPIC33FJ12MC201 breakout board

• NU32_dsPIC_QEI_example.c: Read the encoder count at 250Hz, send to the computer at 5Hz

Controlling a stepper motor with the TB6612

• NU32_stepper_example.c: Use the TB6612 to step the motor at 25 Hz steps (1 rev in 16s)

Controlling an RC servo motor

• NU32_rcservo_pwm_example.c: Use a PWM pin to set the position of the servo (note you only have 5 PWM pins)
• NU32_rcservo_digio_example.c: Use any digital IO pin and a timer to set the position of the servo

Data logging on a uSD card

• Using the Microchip FAT32 library, AN1045