Overview

This is a simple example project for the MSP430 series MCU and the GCC port of the mspgcc project. The project contains a makefile and uses assembler and C sources. It shows a clock on an character LCD.

Features:

• How to use a character LCD.
  • Download font with custom characters
  • It contains a reusable LCD C-module
• How to use (wakeup) interrupts in C
  • Sync foreground with interrupt by using the lowpower modes
• Use printf to print formated strings and do a printf emulation that prints to the LCD.
• Using the Timer_A as realtime clock
• Makefile
  • Compile and link
  • Convert to intel hex format
  • Generate a listing with mixed C / assembly

Required hardware

• A MSP430F1121 or larger device (any from the F1x series)

• Any character type display with a HD44780 controler or compatible (e.g. a KS0066 16x2 type was used for developement). Connections for a four bit interface (LCD->MSP):

  RS  -> P1.1
  R/W -> P1.2
  E   -> P1.3
  D4  -> P1.4
  D5  -> P1.5
  D6  -> P1.6
  D7  -> P1.7
  

  Many LCD controllers run from 3 volts, but the display requires a voltage difference of more than 3 volts for the contrast. This means a negative voltage is needed on the contrast pin (usualy named VEE or VO)

• Watch crystal 32.768kHz

• Optionaly a LED on P2.5 (470 Ohms series resistor to GND)

Source

Files:

• README.txt This file
• font.c Bitmaps of downloadable characters
• font.h
• hardware.h Pins and port descriptions
• lcd.c HD44780 control code
• lcd.h HD44780 control code function prototypes and constants
• main.c Main application
• makefile Build rules

Disclaimer

This example is part of the mspgcc project http://mspgcc.sf.net. See license.txt for details.

chris

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