A project to implement a console using the Mbed using VGA for video output and a PS/2 keyboard for the input. The eventual goal is to also include tools for managing SD cards, and a semi-self-hosting programming environment.
Dependencies: PS2_MbedConsole fastlib SDFileSystem vga640x480g_mbedconsole lightvm mbed
MbedConsole is a cool little project to have a self-contained computer all on an Mbed. So far it has VGA and PS/2 support and can stand alone without a computer powering it. Next planned features are SD card support and a lightweight programmable VM complete with a file editor and self-hosted assembler.
You can view additional details about it at http://earlz.net/tags/mbedconsole
plEarlz.h
- Committer:
- earlz
- Date:
- 2012-09-28
- Revision:
- 11:fede136943a9
- Parent:
- 9:4211d638b2e9
- Child:
- 16:370b9e559f92
File content as of revision 11:fede136943a9:
#ifndef PLEARLZ_H #define PLEARLZ_H #define MAXSTACK 64 #define MAXTEMPSTACK 64 #define MAXLINELENGTH 128 #define DICTIONARYSTEP 4 //how much memory to reserve when doing a reallocation for resizing #define CODEBLOCKSTEP 16 enum ErrorType { None, StackOverflow, StackUnderflow }; //arguments are in the bytecode, not the stack! But, things like Add has no arguments and uses the stack //pointers are assumed 32-bit? enum Opcode { BranchTrue, //argument is 16 bit vaddress BranchFalse, //argument is 16bit vaddress Branch, PushTemp, //pops from stack and pushes onto the temporary stack PopTemp, //pushes onto stack from temporary stack Push, //argument is 32bit number Drop, //trashes top value on stack Call, //call. argument is WORD entry pointer in dictionary CallInt, //call internal argument is function pointer Add, Sub, Mul, Div, Mod, Cgt, //takes two integers and compares for greater than pushes 1 if so, 0 if not Clt, //less than Cgte, //greater than or equal Clte, Ceq, Cneq, LoadStr, //argument is variable length string ending with 0. Pushes address onto stack LoadConst, //pushes the value pointed to by the argument StoreConst, //pops a value and stores it in the memory pointed to by the argument Load, //same as above, except the address is popped first. Store, Swap, New, //pushes a pointer to free memory for an integer NewVar, //pushes a pointer to memory. Size is specified by argument Delete, //pops a pointer and frees it. Pick, //takes an integer position from the stack. Goes that many slots back in the stack and peeks at the value, and then pushes it on the top of the stack Ret //exit }; typedef void (*BuiltinFunction)(void); typedef struct { char name[12]; enum Type{ Constant, ConstantString, Builtin, Function } type; union valueunion{ int intvalue; BuiltinFunction builtin; char *string; } value; } WordKey; /** BranchTarget tracks branches/labels. When a beginning conditional/looping structure is found, it adds a branch target to the list with `target` set to point to the relevant branch target in codeblock When an ending structure is found, it replaces the branch target(which starts at -1) with the actual branch address, **/ typedef struct TargetNode { int target; //position inside of codeblock. Can't use pointers because life is cruel and the block could be reallocated at anytime. TargetNode* previous; //previous instead of next because we're going to "destroy" this list in reverse } BranchTarget; extern ErrorType pl_error; int pl_shell(); static inline int is_whitespace(char c){ return (c==' ') || (c=='\t') || (c=='\n') || (c=='\r'); } static inline int is_numeric(char c){ return (c>='0') && (c<='9'); } static inline int is_alpha(char c){ return ((c>='a') && (c<='z')) || ((c>='A') && (c<='Z')); } static inline int is_identifier(char c){ return is_alpha(c) || is_numeric(c) || (c=='_'); } static inline int is_quote(char c){ return (c=='\"') || (c=='\''); } int forth_execute(uint8_t* block, int length); WordKey *pl_lookup(char* name); int pl_pop(); void pl_push(int val); //builtin functions void bi_print(); #endif