Digilent PmodCLP Manuel utilisateur
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Revision: February 14, 2012
1300 NE Henley Court, Suite 3
Pullman, WA 99163
(509) 334 6306 Voice | (509) 334 6300 Fax
page 1 of 4
Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
Introduction
The PmodCLP is a 16x2 character LCD module that uses two Pmod connectors to present a 3.3V, 8-bit
parallel data interface to system boards. It is based on a Sunlike LCD panel that uses a Samsung KS0066
(or equivalent) LCD controller. The module can be attached to any number of Digilent system boards to
create a character LCD subsystem. This document provides a demonstrational overview of the driver
library(ClpLib) included for operation of this module.
Required Hardware:
1. Cerebot 32Mx4cK or Cerebot 32Mx4
2. PmodCLP –J1 plugged into JA and J2 plugged into JB.
Note: Project was created using MPLAB v8.83
Overview
The module is capable of displaying any one of more than 200 predefined characters in each of the
32 display locations (organized as 16 characters on two rows). Most characters use ASCII codes (see
the Samsung KS0066 data sheet for a complete list of character codes). The module can also
execute a variety of instructions, such as erasing specific characters, setting different display modes,
scrolling, and displaying user-defined characters.
Library Operation
Library Interface
The header file ClpLib_config.h is a configuration file to setup the target platform for the specific
PMOD connections being used (default: JA and JB).
The header file ClpLib.h contains the declarations for the actual functions that are available to the
user for this module. Actual definitions for these functions are found within ClpLib.c.
For more information see PmodCLP Library Reference Manual.
Demo Documentation
The application implements (in a circular manner) a number of steps, each demonstrating the use of
some CLP functions. Buttons are used to trigger some actions and to move through the steps.
PmodCLP Library: CLP Demo Digilent, Inc.
www.digilentinc.com page 2 of 4
Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
No.
Step
Actions
Demonstrates
1.
Welcome screen
Press Any button to
continue
ClpWriteStringAtPos - Write to Clp
2.
Backlight On /
Off
BTN2: toggle backlight
BTN1: continue
ClpWriteStringAtPos - Write to Clp
ClpSetBackLight - Set Backlight
3.
Display Shift left
/ right
BTN2: shift left
BTN1: shift right
Double buttons action to
continue
ClpWriteStringAtPos - Write to Clp
ClpDisplayShift –shift display
ClpDisplayClear –clear display
4.
Display On / Off
BTN2: toggle display
BTN1: continue
ClpWriteStringAtPos - Write to Clp
ClpDisplaySet - Set Display On / Off
ClpReturnHome –Cursor Home
5.
Cursor On / Off
BTN2: toggle cursor
BTN1: continue
ClpWriteStringAtPos - Write to Clp
ClpDisplaySet - Set cursor On / Off
6.
Cursor Blink On
/ Off
BTN2: toggle cursor blink
BTN1: continue
ClpWriteStringAtPos - Write to Clp
ClpDisplaySet - Set Blink On / Off
7.
Cursor shift left /
right
BTN2: cursor shift left
BTN1: cursor shift right
Double buttons action to
continue
ClpWriteStringAtPos - Write to Clp
ClpCursorShift –shift cursor
ClpDisplayClear –clear display
8.
User defined
character
Any button to continue
ClpWriteBytesAtPosCgram –write
user defined character data to
CGRAM
ClpWriteDataByte –send CGRAM
character to CLP
Features:
oButtons are debounced.
oRecognizes three button actions:
1. BTN1 pressed
2. BTN2 pressed
3. Releasing one button while the other is pressed (double buttons action)
Project Files
File
Containing
main.c
Main application file. Contains main application loop,
interface ISR, buttons processing.
As it implements application functionality, is modified for
each application.
util.h
Common Utility Procedures. This is a standard Digilent
file, also used in other applications.
It was not modified for this application.
util.c
Common Utility Procedures. This is a standard Digilent
file, also used in other applications, implementing some
led and wait functions.
It was not modified for this application.
stdtypes.h
Digilent Standard Type Declarations. This is a standard
PmodCLP Library: CLP Demo Digilent, Inc.
www.digilentinc.com page 3 of 4
Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
Digilent file, also used in other applications.
It was not modified for this application.
Resources Used
Timer5 configuration is done using Plib macros in AppInit function. SFRs approach is also provided in
the commented code.
Plib macro used:
OpenTimer5(T5_ON | T5_SOURCE_INT | T5_PS_1_8, 99);
ConfigIntTimer5(T5_INT_ON | T5_INT_PRIOR_7 | T5_INT_SUB_PRIOR_3);
Meaning:
- T5_ON –timer 5 is ON.
- T5_PS_1_8 (Prescaler 1/8): so the frequency is 1/8 of Peripheral bus freq, which is 1/8 of
SYSCLK (65 MHz) = 1 MHz
- Period = 99, so Timer period = (99 + 1) * 1/1MHz = 100 us
- T5_SOURCE_INT : Timer5 triggers interrupt
- T5_INT_ON –T5 interrupt is ON
- T5_INT_PRIOR_7, T5_INT_SUB_PRIOR_3 - timer interrupt priority level 7, subpriority level
3
More information about Timer5 is shown in Timer5Handler.
Functions defined in main.c
void __ISR(_TIMER_5_VECTOR, ipl7) Timer5Handler(void)
Parameters:
None
Interrupt service routine for Timer 5interrupt. Timer 5 is used to perform software debouncing
of the on-board buttons.
int main(void)
Parameters:
none
Main program module. Performs basic board initialization (by calling DeviceInit and AppInit)
and then enters the main program loop, where steps are cycled. For every step,
WaitUntilBtnPressed is called in order to wait for the buttons.
void WaitUntilBtnPressed(BOOL *pfBtn1Process, BOOL *pfBtn2Process)
Parameters:
pfBtn1Process used as output parameter fTrue if the button 1 causes
processing fFalse if the button 1 does not cause processing.
pfBtn2Process used as output parameter fTrue if the button 2 causes
processing fFalse if the button 2 does not cause processing.
PmodCLP Library: CLP Demo Digilent, Inc.
www.digilentinc.com page 4 of 4
Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
Waits in a loop until a button action is detected, then configures the output parameters and
returns. It reads flags set by Timer5Handler, detecting the following actions:
osingle button: one of BTN1, BTN2 is pressed - *pfBtn1Process, *pfBtn2Process are
set to fTrue
odouble buttons: one of BTN1, BTN2 is released while the other is pressed –both
*pfBTn1Process and *pfBtn2Process are set to fTrue
This function is called from main program loop, so its loop is the place where other
functionality can be placed.
void DeviceInit(void)
Parameters:
none
This routine initializes the on-chip and on-board peripheral devices to their default state. I t
also calls ClpPinsConfigure() toconfigure CLP pins.
void AppInit(void)
Parameters:
none
This routine performs application specific initialization. It configures devices and global
variables for the application. It configures TIMER5 and its interrupt using Plib macros. SFRs approach
is also provided in the commented code.
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