Difference between revisions of "PIC"

From the Linux and Unix Users Group at Virginia Teck Wiki
Jump to: navigation, search
imported>Mjh
(Categorization)
imported>Mjh
(Merged in Uniluug content)
Line 1: Line 1:
−
'''PIC''' microcontrollers are a [[w:Reduced_instruction_set_computing|RISC]] line from Microchip. They are used in [[gp:ECE 2504 Introduction to Computer Engineering|ECE 2504 Introduction to Computer Engineering]] and [[gp:ECE 4534 Embedded System Design|ECE 4534 Embedded System Design]].
+
'''PIC''' microcontrollers are a relatively popular line of [[w:Reduced_instruction_set_computing|RISC]] microcontrollers from [[w:Microchip_Technology|Microchip Technology]]. Different toolchains are required to build code between the 8-bit, 16-bit, and 32-bit data size lines. They are used in [[gp:ECE 2504 Introduction to Computer Engineering|ECE 2504 Introduction to Computer Engineering]] and [[gp:ECE 4534 Embedded System Design|ECE 4534 Embedded System Design]].
 +
 
 +
==Toolchains==
 +
===8-Bit===
 +
The [[freeware]] [http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en536656 MCC18 toolchain] from Microchip provides libraries and will compile and link for the 8-bit data word chips such as PIC18 devices. MCC18 can be run on Linux using wine. [http://sdcc.sourceforge.net/index.php sdcc] is a [[software libre]] toolchain that supports a [http://sdcc.sourceforge.net/doc/sdccman.html/node122.html number of PIC18 devices].
 +
 
 +
===16-Bit===
 +
To build a nonfree toolchain for Linux, use the instructions at [http://www.electricrock.co.nz/blog/microchip-c30/]. To build a completely [[software libre]] toolchain for the PIC24 or dsPIC, follow the steps below.
 +
<pre>
 +
sudo apt-get install build-essential tofrodos
 +
mkdir ~/prj/pic30
 +
cd ~/prj/pic30
 +
wget http://ww1.microchip.com/downloads/en/DeviceDoc/mplabalc30v3_31.tar.gz
 +
wget http://ww1.microchip.com/downloads/en/DeviceDoc/mplabc30v3_31.tar.gz
 +
wget http://www.electricrock.co.nz/c30/pic30-binutils-v01.tar.bz2
 +
wget http://www.electricrock.co.nz/c30/pic30-gcc-v01.tar.bz2
 +
tar xf mplabalc30v3_31.tar.gz
 +
tar xf mplabc30v3_31.tar.gz
 +
find . -type f -exec fromdos {} \;
 +
# We don't need to "fix" the search path by adding -nonfree directories
 +
tar xf pic30-binutils-v01.tar.bz2 --exclude=search-path-fix.diff
 +
tar xf pic30-gcc-v01.tar.bz2 --exclude=search-path-fix.diff
 +
for p in pic30-binutils-v01/patches/*; do patch -p0 < $p; done
 +
for p in pic30-gcc-v01/patches/*; do patch -p0 < $p; done
 +
cd acme
 +
CFLAGS=-DMCHP_VERSION=v3.31-Debian ./configure --prefix="${HOME}/prj/pic30/build" --target=pic30-coff
 +
make
 +
cd ..
 +
cd gcc-4.0.2/gcc-4.0.2
 +
CFLAGS=-DMCHP_VERSION=v3.31-Debian ./configure --prefix="${HOME}/prj/pic30/build" --target=pic30-coff --enable-languages=c
 +
make
 +
cd ../..
 +
</pre>
 +
 
 +
===32-Bit===
 +
 
 +
 
 +
==Programmers==
 +
See the [[PICKit 2]] article for programming your hex file natively using <code>pk2cmd</code>.
 +
 
 +
==Integrated Development Environments==
 +
MPLAB is the freeware IDE written by Microchip. Only Windows versions of older versions were made available, although those could be run with wine and with a [[Windows virtual machine]]. The newer MPLAB X is cross-platform [[freeware]]. [http://piklab.sourceforge.net/ Piklab] is a [[software libre]] IDE for PIC microcontrollers.
  
 
==Compiling Code==
 
==Compiling Code==
Line 68: Line 109:
 
==External Links==
 
==External Links==
 
* [http://hackaday.com/2010/11/03/how-to-program-pics-using-linux/ How-to Program PICs using Linux - Hackaday] (see article and comments)
 
* [http://hackaday.com/2010/11/03/how-to-program-pics-using-linux/ How-to Program PICs using Linux - Hackaday] (see article and comments)
 +
* [http://gun.io/open/43/libre-pic30-toolchain-bitbake-recipe Bounty on a libre pic30 toolchain BitBake recipe]
 +
  
 
[[Category:Hardware hacking]]
 
[[Category:Hardware hacking]]
 
[[Category:Classwork]]
 
[[Category:Classwork]]

Revision as of 17:45, 18 February 2015

PIC microcontrollers are a relatively popular line of RISC microcontrollers from Microchip Technology. Different toolchains are required to build code between the 8-bit, 16-bit, and 32-bit data size lines. They are used in ECE 2504 Introduction to Computer Engineering and ECE 4534 Embedded System Design.

Toolchains

8-Bit

The freeware MCC18 toolchain from Microchip provides libraries and will compile and link for the 8-bit data word chips such as PIC18 devices. MCC18 can be run on Linux using wine. sdcc is a software libre toolchain that supports a number of PIC18 devices.

16-Bit

To build a nonfree toolchain for Linux, use the instructions at [1]. To build a completely software libre toolchain for the PIC24 or dsPIC, follow the steps below. 

sudo apt-get install build-essential tofrodos
mkdir ~/prj/pic30
cd ~/prj/pic30
wget http://ww1.microchip.com/downloads/en/DeviceDoc/mplabalc30v3_31.tar.gz
wget http://ww1.microchip.com/downloads/en/DeviceDoc/mplabc30v3_31.tar.gz
wget http://www.electricrock.co.nz/c30/pic30-binutils-v01.tar.bz2
wget http://www.electricrock.co.nz/c30/pic30-gcc-v01.tar.bz2
tar xf mplabalc30v3_31.tar.gz
tar xf mplabc30v3_31.tar.gz
find . -type f -exec fromdos {} \;
# We don't need to "fix" the search path by adding -nonfree directories
tar xf pic30-binutils-v01.tar.bz2 --exclude=search-path-fix.diff
tar xf pic30-gcc-v01.tar.bz2 --exclude=search-path-fix.diff
for p in pic30-binutils-v01/patches/*; do patch -p0 < $p; done
for p in pic30-gcc-v01/patches/*; do patch -p0 < $p; done
cd acme
CFLAGS=-DMCHP_VERSION=v3.31-Debian ./configure --prefix="${HOME}/prj/pic30/build" --target=pic30-coff
make
cd ..
cd gcc-4.0.2/gcc-4.0.2
CFLAGS=-DMCHP_VERSION=v3.31-Debian ./configure --prefix="${HOME}/prj/pic30/build" --target=pic30-coff --enable-languages=c
make
cd ../..

32-Bit

Programmers

See the PICKit 2 article for programming your hex file natively using pk2cmd.

Integrated Development Environments

MPLAB is the freeware IDE written by Microchip. Only Windows versions of older versions were made available, although those could be run with wine and with a Windows virtual machine. The newer MPLAB X is cross-platform freeware. Piklab is a software libre IDE for PIC microcontrollers.

Compiling Code

MPLAB is the IDE recommended by the ECE department. It can be run inside a Virtual Machine, programming using USB passthrough. It can also be installed under wine and the compiler used from the commandline. sdcc is a GPL C compiler with some support for PIC devices. Some GNU utilities (namely the assembler and linker, but not compiler) have been modified to support Microchip's microprocessors as part of the gputils project. Piklab is an IDE with support for both open source toolchains.

Using Wine to Run the Toolchain

The MCC18 toolchain can be run using wine. This page should be updated to give more detailed instructions.

Makefile Using Wine

The file below is a work in progress. 

# Hacked up makefile for Linux

export WINEPREFIX = /home/user/class/embedded/pic/toolchain
MCCPATH = $(WINEPREFIX)/drive_c/MCC18/bin
CC = wine $(MCCPATH)/mcc18.exe
CFLAGS =  --extended -Opa-
# -D__DEBUG -Ou- -Ot- -Ob- -Op- -Or- -Od- -Opa-
LD = wine $(MCCPATH)/mplink.exe
AR = wine $(MCCPATH)/mplib.exe
PK2PATH = /home/user/class/embedded/pic/pk2cmd/pk2cmdv1.20LinuxMacSource
PK2CMD = $(PK2PATH)/pk2cmd
RM = rm

Proj1.cof : main.o messages.o interSecure Shellrupts.o user_interrupts.o my_uart.o uart_thread.o timer1_thread.o timer0_thread.o my_i2c.o
	$(LD) /p18F2680 /l"C:\MCC18\lib" "main.o" "messages.o" "interrupts.o" "user_interrupts.o" "my_uart.o" "uart_thread.o" "timer1_thread.o" "timer0_thread.o" "my_i2c.o" /u_CRUNTIME /u_EXTENDEDMODE /z__MPLAB_BUILD=1 /m"Proj1.map" /w /o"Proj1.cof"

main.o : main.c ../toolchain/drive_c/MCC18/h/stdio.h ../toolchain/drive_c/MCC18/h/usart.h ../toolchain/drive_c/MCC18/h/i2c.h ../toolchain/drive_c/MCC18/h/timers.h messages.h my_uart.h my_i2c.h uart_thread.h timer1_thread.h timer0_thread.h main.c maindefs.h ../toolchain/drive_c/MCC18/h/p18f2680.h ../toolchain/drive_c/MCC18/h/stdarg.h ../toolchain/drive_c/MCC18/h/stddef.h ../toolchain/drive_c/MCC18/h/pconfig.h interrupts.h
	$(CC) -p=18F2680 "main.c" -fo="main.o" $(CFLAGS)

messages.o : messages.c messages.h messages.c maindefs.h ../toolchain/drive_c/MCC18/h/p18f2680.h interrupts.h
	$(CC) -p=18F2680 "messages.c" -fo="messages.o" $(CFLAGS)

interrupts.o : interrupts.c messages.h my_uart.h interrupts.c maindefs.h ../toolchain/drive_c/MCC18/h/p18f2680.h interrupts.h user_interrupts.h
	$(CC) -p=18F2680 "interrupts.c" -fo="interrupts.o" $(CFLAGS)

user_interrupts.o : user_interrupts.c ../toolchain/drive_c/MCC18/h/timers.h messages.h my_uart.h user_interrupts.c maindefs.h ../toolchain/drive_c/MCC18/h/p18f2680.h ../toolchain/drive_c/MCC18/h/pconfig.h user_interrupts.h
	$(CC) -p=18F2680 "user_interrupts.c" -fo="user_interrupts.o" $(CFLAGS)

my_uart.o : my_uart.c ../toolchain/drive_c/MCC18/h/usart.h messages.h my_uart.h my_uart.c maindefs.h ../toolchain/drive_c/MCC18/h/p18f2680.h ../toolchain/drive_c/MCC18/h/pconfig.h
	$(CC) -p=18F2680 "my_uart.c" -fo="my_uart.o" $(CFLAGS)

uart_thread.o : uart_thread.c ../toolchain/drive_c/MCC18/h/stdio.h uart_thread.h uart_thread.c maindefs.h ../toolchain/drive_c/MCC18/h/p18f2680.h ../toolchain/drive_c/MCC18/h/stdarg.h ../toolchain/drive_c/MCC18/h/stddef.h
	$(CC) -p=18F2680 "uart_thread.c" -fo="uart_thread.o" $(CFLAGS)

timer1_thread.o : timer1_thread.c ../toolchain/drive_c/MCC18/h/stdio.h messages.h timer1_thread.h timer1_thread.c maindefs.h ../toolchain/drive_c/MCC18/h/p18f2680.h ../toolchain/drive_c/MCC18/h/stdarg.h ../toolchain/drive_c/MCC18/h/stddef.h
	$(CC) -p=18F2680 "timer1_thread.c" -fo="timer1_thread.o" $(CFLAGS)

timer0_thread.o : timer0_thread.c ../toolchain/drive_c/MCC18/h/stdio.h timer0_thread.h timer0_thread.c maindefs.h ../toolchain/drive_c/MCC18/h/p18f2680.h ../toolchain/drive_c/MCC18/h/stdarg.h ../toolchain/drive_c/MCC18/h/stddef.h
	$(CC) -p=18F2680 "timer0_thread.c" -fo="timer0_thread.o" $(CFLAGS)

my_i2c.o : my_i2c.c ../toolchain/drive_c/MCC18/h/i2c.h messages.h my_i2c.h my_i2c.c maindefs.h ../toolchain/drive_c/MCC18/h/p18f2680.h ../toolchain/drive_c/MCC18/h/pconfig.h
	$(CC) -p=18F2680 "my_i2c.c" -fo="my_i2c.o" $(CFLAGS)

clean : 
	$(RM) "main.o" "messages.o" "interrupts.o" "user_interrupts.o" "my_uart.o" "uart_thread.o" "timer1_thread.o" "timer0_thread.o" "my_i2c.o" "Proj1.cof" "Proj1.hex" "Proj1.map"

prog : Proj1.hex
	$(PK2CMD) -A3.3 -B$(PK2PATH) -P -M -FProj1.hex -Y -T

Programming

See the PICKit 2 article for programming your hex file natively using pk2cmd.

Debugging

Reading printf-style debugging messages over UART with the PICKit 2 is possible from a Windows virtual machine with USB passthrough.

External Links

Retrieved from "https://vtluug.org/w/index.php?title=PIC&oldid=2974"