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Developer(s) | Philippe Paternotte |
---|---|
Stable release | 2.0.6 / September 9, 2014 |
Operating system | Win32 |
Type | Compiler |
License | Freeware |
Website | www |
Pic Micro Pascala.k.a. PMP is a free Pascal cross compiler for PIC microcontrollers. It is intended to work with the Microchip Technology MPLAB suite installed; it has its own IDE (Scintilla-based) and it is a highly optimized compiler.
It is intended to target 8-bit processors only: PIC10, PIC12, PIC16, PIC16 enhanced, PIC18.
The main axis of development was to avoid special built-in functions and procedures to interface hardware registers. These registers are accessed directly as variables, there are no wrapper functions, and emitted code is quite compact.
PMP does not include an assembler or linker. It is designed to work with the Microchip MPLAB suite installed, and directly uses MPASM and MPLINK .lkr files for memory mapping initializations; as of V2 it comes with its own database for processor features and standard register definitions.
PMP also supports the GPUTILS suite.
PMP does not support object-oriented programming, but a RECORD can have methods.
As of 2014, the implementation supports multiple file compiling, by include directives and by a per unit concept. PMP supports a unique feature: variables may be declared in EEPROM and then used transparently as any other variable (with some limitations).
PMP's data types:
PMP syntax is very close to the non-OOP syntax of Turbo Pascal or Delphi, with some extensions to support some target processor features (bit manipulations ...).
programBeacon;usesA2D;varI_IR_Receiver:boolean@PORTB.4;// TSOP1736 IR receiverO_LED_RECEIVING:boolean@PORTC.0;// Receive in progressO_LED_ERROR:boolean@PORTC.1;// Receive errorO_PWM_A:boolean@PORTC.4;// PWM to US transducer phase A (addr cannot be changed)O_PWM_B:boolean@PORTC.5;// PWM to US transducer phase B (addr cannot be changed){ Beacon Addr dip switches }I_ADDR_0:boolean@PORTA.2;I_ADDR_1:boolean@PORTA.5;CONSTLOW_BATT_SENSOR_CHANNEL=ANS0;// Channel for battery measurement (RA0){ Led on/off values }cLED_ON=TRUE;cLED_OFF=FALSE;// pins that are inputsTRISA_MASK=[I_NOT_OPTION_SERIAL,I_ADDR_0,I_ADDR_1];TRISB_MASK=[I_IR_Receiver];TRISC_MASK=[];begin...PORTA:=0;// Prepare all outputs TRISA:=TRISA_MASK;// Set pins direction...A2D_Init([LOW_BATT_SENSOR_CHANNEL],5,adcFosc16,adm8Bits,advVdd);Baud(19200);// setup serial portassign(output,SerialPort_Output);writeln('Hello world!');...end.
Since version 1.6, some language "extensions" may be used (with explicit activation), most of them coming from other Pascal-Like languages such as Oberon or Modula:
...FORIinSomeVarDO<Statements>(* SomeVar may be any variable or an enumeration type *)FORI:=XTOYBYnDO<Statements>(* Specification of the variable step value *)LOOP<Statements>END(* Forever loop *)IFCondition1THEN<Statements>ELSIFCondition2THEN<Statements>(* Shortcut for ELSE IF *)RETURNSomeResult(* Function's result value assignment and exit *)
PMP was created in 2006 by Philippe Paternotte and released as freeware for now, as free software in the future. The latest version is 2.0.6, September 2014. [1]
PMP has been the subject of an article in SERVO Magazine in March 2015. [2]
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is a reserved word, type modifier, storage class, and hint. The register
keyword was deprecated in C++, until it became reserved and unused in C++17. It suggests that the compiler store a declared variable in a CPU register instead of in RAM. If possible, depending of type of CPU and complexity of the program code, it will optimize access to that variable, and will hence improve the execution time of a program. In C the location of a variable declared with register
cannot be accessed, but the sizeof
operator can be applied. Aside from this limitation, register
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may still be significant; for example the Microchip MPLAB XC32 compiler allows the programmer to specify a particular register with the keyword; however, this is discouraged in favor of the compiler's optimizations. When used, register
is typically for loop counters, or possibly for other very frequently used variables in the code.