PIC Micro Controller C Routine Input / Output Library

• Ports

  • Using macros to simplify IO port operations in C
  • Button/Switch Debouncing by Damon Hopkins
  • SPI Setup by Peter Schutz
  • RS232 to SPI converter in CCS C by David Knott
  • C Serial I/O Software
  • Rob Hamerling shares this code: S628.htm Interrupt driven routines, using PIC hardware USART,with CTS flow control. Source code for CC5X C compiler with ample comments, easily adaptable to other PICs than the sample 16F628.
  • SPI to MAX3100 rs232 in HiTech C by John A. Kraft
  • SPI to Dataflash by Michail Evstafiev

• Peripherals

  • Visual
    • Hitachi Charactor LCD Drivers by Andy Kunz
    • Hitachi Charactor LCD Drivers by Craig Lee
    • KS0107/KS0108 Graphic LCD code by Jon Hulatt
    • Colin D Barnard shares this code: LCD using a shift register
    • C code for 7 segment displays.
    • LED dimmer. Software PWM, A2D from Potentiometer. Written in CCS C
  • Mechanical
    • Servos
      • Dale Botkins CCS ServoTst Servo Motor code
      • JP Browns CCS Servo code
      • Graham Keggi shares this code: Servo control with a PIC24F via Output Compare module. Operates in CPU idle mode.
    • Quadrature Encoder ISR by David Kott
    • Dallas DS1990 reader by Enzo Gomez
  • /techref/microchip/io/audio.htm

See also:

• http://www.starlino.com/port_macro.html Completely brilliant set of macros to greatly simplify setup of ports and pins in C for the PIC and AVR controllers.
• http://www.ozemail.com.au/~dljones/pic.htm has some general purpose I2C routines written in HiTech C.
• http://ubasics.com/adam/electronics/lcd/cc5xlcd.c LCD code (16c66):
• http://ubasics.com/adam/electronics/ha/code.shtml#code LCD, RS-232 (hardware UART), A/D, and keypad(16F876):
• http://www.emicros.com/micros/sapin3.htm The SAPIN3 is a microcontroller based module that converts 2 analog inputs to an 8 bit value, reads a single digital input, and serially transmits the values at 9600 baud. This simple device requires only 1 integrated circuit and a handful of discrete components. The software is written in C using the CCS PCM C Compiler which is a powerful and cost effective compiler.

Archive:

• PICList post "Frequency counting"

Questions:

• victor.goertzen@cancercare.mb.ca asks:

  I am looking for C code for a software RS232 port. I need 2 separate ports on 1 PIC, 1 can be the USART, the other must be implemented in software. Thanks Vic

  It's called "bit banging", search for "PIC bit bang serial io"

• george_inacio@yahoo.com.br asks:

  I made some modifications in the xlcd.h but the microcontroller don´t refletc the changes. I know I have to recompile the xlcd lib but I don´t know how to do it. Could someone explain me step-by-step? Thanks in advance!
  
  George Inacio

  replies: there are batch files to do that. one of them is called makeonep.bat if i remember correctly. This is all explained in the microchip library reference documents which you can download from the microchip site. i'm sure you read those already, didn't you?

• rdlarson@lucent.com asks:

  Hello, after attempting several peoples code for driving a Hitachi HD44780 based LCD I am confused. I happen to be using a Optrex DMC16106A, which is a 16x1 display. I have this connected via PortB (data) and PortD (ctrl) on a 18F452 Microchip processor. The processor works fine as I can write simple routines to blink LEDs and everything works fine. When I attempt to initialize the LCD and write a few characters, the display lights every pixel in every character position. I know I can doing something, because without the code the display remains totally dark. I have tried assembly routines as well as C routines all with no luck. I am using the C18 C compiler and MPLAB 6.0 with no luck. I have even tried using their XLCD libraries to start from scratch again nothing. Does anyone have any routines that work with the 18FXXX? I would love some recommendations. Thanks Russ Larson

  replies: LCD = all black means not initialised. The Microchip xlcd libs definately work. You need to recompile the libraries once you've edited the .h files to reflect the port/pin you;ve connected your LCD. Did you do that? If not it's probably a timing issue. With the xlcd functions, you need to provide your own timing functions - make these wait a lot longer - maybe 10 or 20 times as long. Then if it works, slowly tighten up the timings. Additionally, make sure you're waiting at least 100ms or so after power on before you initialise the LCD- they take some time to settle down. If you're still stuck, please join and post to the mailing list.