embedded system design - hcmutbmthanh/esd/ch4.pdf · of pic and in some cases library functions,...

ĐẠI HỌC QUỐC GIA TP.HỒ CHÍ MINH

TRƯỜNG ĐẠI HỌC BÁCH KHOAKHOA ĐIỆN-ĐIỆN TỬ

BỘ MÔN KỸ THUẬT ĐIỆN TỬ

Bùi Minh Thành – Bộ Môn Kỹ Thuật Điện Tử - ĐHBK11

Embedded System Design

Chapter 4: Development tools

- Software development tool (CCS)

- Advanced simulation with Proteus

Bùi Minh Thành - Bộ môn Kỹ Thuật Điện Tử - ĐHBK

References

• Textbook

– Martin Bates, “Programming 8-bit PIC Microcontrollers in C”, Newnes, 2008

• Many C compilers for PIC:

– MikroC (www.mikroe.com)

– PICC18 (www.htsoft.com)

– MPLAB C18, C30 (www.microchip.com)

– CCS C (www.microchipc.com/reviews/CCS_C/)

2

http://www.elsevier.com/wps/find/bookdescription.cws_home/714793/description


Outline

1. Software development tool (CCS)2. Advanced simmulation with Proteus

3


1. Software development tool (CCS C Compiler)

- CCS (Customer Computer Services) compiler supports the Microchip PIC12x, PIC16x, PIC18x, and dsPIC devices.

- The PCB, PCM, and PCH are separate compilers. - PCB is for 12-bit opcodes- PCM is for 14-bit opcodes- And PCH is for 16-bit opcode PIC® microcontrollers

4


Program structure

5


Program structure

6

• #include: is a directive which allows the pro-grammer to include header

files, which typically give the compiler some information regarding the type

of PIC and in some cases library functions, such as the mathematics library.

• #fuses is a directive which inserts code to set up the configuration fuses

at programming time.

• #use is a directive which allows the programmer to give the compiler

some information regarding the hardware (e.g. clock speed, or pins used

for serial I/O) or how a peripheral device is to be set up.

• #byte is a directive allowing the programmer to give a fixed File location a

name. Ex: #byte PortA = 5 to define Port A

• #bit is a directive allowing the programmer to give a bit in a fixed File

location a name; e.g. a bit in a port connected to a LED; e.g.

#bit LED = 5.2.

• All C programs must have a main() function.


Basic Data types

7

Types Range

short int 1-bit number

int1 0 or 1

int 8-bit unsigned number0 – 255 (0 – 0xFF)int8

char An 8-bit character

long int 16-bit unsigned number

int16 16-bit unsigned number

int32 32-bit unsigned number

signed int 8-bit signed number

signed int8 -128 – 127

signed long 16-bit signed number

signed int16 16-bit signed number

signed int32 32-bit signed number

float 32-bit floating-point number

The qualifier signed may be

used to deal with negative

numbers.

The keywords int8 (same as

int), int16 (same as long) and

int32 are specific to the CCS

compiler.

The keyword const tells the

compiler not to subsequently

change the object


Basic Data types

8


Simple selection structures

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Simple selection structures

10


Iterative Statements

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Iterative Statements

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Parallel port

13


2. Advanced simmulation with Proteus

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• Proteus Virtual System Modelling (VSM) combines mixed mode SPICE circuit

simulation, animated components and microprocessor models to facilitate co-

simulation of complete microcontroller based designs.

• It is possible to develop and test such designs before a physical prototype is

constructed.

• Available for PIC, 8051, MSP430, AVR, HC11, ARM7/LPC2000 and Basic

Stamp processors

• See your code interact with simulated hardware in real-time

• Interactive peripheral models for displays, keypads, etc.

• Over 8000 analogue and digital device models

• Extensive single step and debugging facilities including system wide

diagnostics.

• Works with popular compilers and assemblers


Exercises 1

15

Design an embeded system that creates a pulse with the cycle of 1ms on

PIN 0 of Port D of PIC 16F877A


Exercises 1 – Software design

16

Open CCS PIC compiler.

New Project Wizard



17

Fill out the name of the project (ex: pulse_1s.pjt) and click Save



18

Choose Device (16F877A) and Oscillator Frequency (20MHz) and click OK



19

File pulse_1s.c is opened with some default code. Delete unnecessary code

and type the code as follows:

Choose Compile Compile to compile the project.


Exercises 1 – Hardware design

20

Now, we use Protues to design the hardware of the circuit

Open Proteus Choose P to pick devices from Libraries



21

For this exercise, we need: 1 PIC16F877A, 1 LED, 1 220 resistor, source and

ground. Design the circuit as follows:



22

Double-click on the PIC16F877A to open edit component box and browse the

pulse_1s.hex file in the Program File and change the Processor Clock Frequency

to 20MHz click OK



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Finally, click to to see how it works


Exercise 2

24

Write program that enables 4 LEDs to be turned on gradually in the following

sequence: D0 D1 D2 D3 D2 D1 D0 … Note that the turning cycle

is 1s.


Exercise 3

25

Write the program that allows 2 7-seg led count gradually from 0 to 9 and then

repeat again. Know that LED 7-SEG 0 is common cathode and LED 7-SEG 1 is

common anode and the counting cycle is 500ms.


• PIC16F877 Register Map

26

Unimplemented data

locations, read as ‘0’

* Not a physical register

embedded system design - hcmutbmthanh/esd/ch4.pdf · of pic and in some cases library functions,...

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