Microchip dsPIC microcontrollers

16-bit PIC microcontroller-based Embedded Systems

1. PIC24 microcontrollers

2. dsPIC Digital Signal Conditioners (DSC)

PIC24 family of microcontrollers

1. PIC24F Low Power

2. PIC24H/E High Performance

dsPIC family of DSC

1. dsPIC30F 5V operation

2. dsPIC33F/E High Performance

We will be using dsPIC30F4013.

40 Pin

48k Program Memory

2k Data Memory

1k EEPROM

5 16-bit Timers

4 Input Capture and 4 Output Compare/PWM

13 Channel 12-bit ADC

2 UART

1 SPI and 1 I2C

1 CAN

Applications

In addition to the Mid-range PIC application

Advanced Motor Control

Speech and Audio Embedded Applications

Graphics Display

Advanced Communication Peripherals

Deterministic Interrupt Response

On-Chip Oscillator

Hardware Real-Time Clock

DSP Applications; FFT, Filters etc.

dsPIC Resources

dsPIC microcontrollers are relatively new devices. There

are few source of information:

1- dsPIC30F3014-4013 datasheet

2- dsPIC Master Reference Manual

3- Programming dsPIC (Digital Signal Controllers) in C

3- mikroC PRO for dsPIC Help option of the Compiler

Pinouts

dsPIC30F4013 Program space memory

RESET Vector at 0x00

Interrupt Vector Table

0x000004 to 0000x7FE

Data Space memory

is split into two

blocks of X and Y

Data Space is

separate for some

DSP instructions

and linear for MCU

instructions

Digital Inputs/Outputs

PORTA- 1 bit, RA11

PORTB- 13 bits, RB0-12

PORTC- 3 bits, RC13-15

PORTD- 6 bits, RD0-3 and RD8-9

PORTF- 7 bits, RF0-6

dsPICF4013 has 5 ports.

Not all the pin are available on each port.

PORTA

PORTD

PORTBH

PORTBL

PORTF

RF6RF5RF4RF3RF2RF1RF0PORTF

RD9RD8RD3RD2RD1RD0PORTD

RB12RB11RB10RB9RB8PORTBH

RB7RB6RB5RB4RB3RB2RB1RB0PORTBL

RA11RC14RC13PORTA

Bit 7Bit 6Bit 5Bit 4Bit 3Bit 2Bit 1Bit 0

To allow maximum flexibility, the I/O pins are grouped onto

the ports.

Programming digital Inputs and outputs

3 registers are associated with each I/O pin.

1- TRISx

2- LATx

3- PORTx

TRISx determines whether the pin is an input or an

output.

1 makes the pin input

0 makes the pin output

The relevant registers are:

TRISA TRISB TRISC TRISD TRISF

A read from latch instruction reads the latch (LATx)

A write to latch instruction writes to the latch (LATx)

A read from the port (PORTx) reads the pin

A write to the port (PORTx) writes to the pin

Configuring TRISx and outputs

TRISF=0x00; // Make all the bits of PORTF output

To change a bit to output without affecting status of other

bits use masking technique using AND & operator.

For example to make bit 0 of PORTF output without

changing other bits:

TRISF=(LATF&0xfe);

X X X X X X X X

1 1 1 1 1 1 1 0

X X X X X X X 0

Original TRISF

Mask

New TRISF

Configuring TRISx and inputs

TRISF=0x00; // Make all the bits of PORTF output

To change a bit to input without affecting status of other

bits use masking technique and OR | operator.

For example to make bit 1 of PORTF input without

changing other bits:

TRISF=(LATF|0x02);

Original TRISF

Mask

New TRISF

X X X X X X X X

0 0 0 0 0 0 1 0

X X X X X X 1 x

Changing status of output without affecting others

TRISF=0x00; // Make PORTF output

PORTF=0x0f; // Turn bits 0-3 on & 4-7 off

To turn bit 0 on without affecting other bits:

PORTF=(LATF&0xff)|0x01;

Alternatively:

PORTF.B0=1;

Tutorial

1- Make PORTB output.

2- Make bits 0 and 1 of PORTB input.

3- Turn bit 3 on.

Note: In order to use PORTB pins for digital I/O, the

corresponding bits in the ADPCFG register must be set

to 1, even if the A/D module is turned off.

ADPCFG register

PORTB can be used as a digital I/O port or as analogue

input port for the ADC converter. ADPCFG is used to

assign each bit of PORTB as digital or analogue port.

Bit15 Bit14 Bit13 Bit12 Bit11 Bit10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

PCF

G15

PCF

G14

PCF

G13

PCF

G12

PCF

G11

PCF

G10

PCF

G9

PCF

G8

PCF

G7

PCF

G6

PCF

G5

PCF

G4

PCF

G3

PCF

G2

PCF

G1

PCF

G0

For example to make PORTBL digital port and PORTBH

analogue add the following line to your programs.

ADPCFG=0x00ff;

Digital I/O example program 1

Turn all the LEDs connected to PORTBL on when RB8 is

pressed.

void main( ) {

ADPCFG=0x01ff; // Configure PORTBL port as digital

TRISB=(TRISB&0xff00)|0x0100; // Make PORTBL

output & RD8 input

while(1)

{

//if(PORTD.B0) PORTB=0x00ff; // Turn PORTBL on

// A better way is

if(PORTD.B0) PORTB=(LATB&0xff00)|0x00ff;

else PORTB=0x0000;

}

}

Digital I/O example program 2

Turn all the LEDs connected to PORTBL on when RD0

is pressed. Turn off the LEDs when RD1 is pressed.

void main( ) {

ADPCFG=0x00ff; // Configure PORTBL port as digital

//TRISB=0xff00; // Make PORTBL output

TRISB=(LATB&0x1f00); // Alternative better method

TRISD=0xff; // Make PORTF input

while(1)

{

if (PORTD.B0==1)

{PORTB=0x00ff; }

if(PORTD.B1==1)

{PORTB=0x0000;}

}}

Digital I/O Tutorial

Write a program to flash (turn on & off) bit 0 of PORTB

at regular intervals.

Reduce the flashing time intervals every time bit 1 of

PORTD is pressed.

Write your own delay function. For example:

void My_delay(int T)

{

int x,y;

for(y=0;y