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.cpp
- Committer:
- earlz
- Date:
- 2013-04-15
- Revision:
- 20:13556e5bac04
- Parent:
- 16:370b9e559f92
File content as of revision 20:13556e5bac04:
/* <Copyright Header> Copyright (c) 2012 Jordan "Earlz" Earls <http://lastyearswishes.com> All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. The name of the author may not be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. This file is part of the MbedConsole project */ #include "mbedconsole.h" #include "plEarlz.h" #include <stdarg.h> #include <stdint.h> //Basically a non-conforming take on Forth, btw. inline int internal_captureline(void* pBuffer, char const* pFormatString, ...) { char* pStringEnd = (char*)pBuffer + strlen((char*)pBuffer); va_list valist; va_start(valist, pFormatString); return vsprintf(pStringEnd, pFormatString, valist); } void printheapstats() { char buffer[256]; __heapstats(internal_captureline, buffer); vputs("Memory info: "); vputs(buffer); } BranchTarget *last_target=NULL; ErrorType pl_error=None; enum WordType { Unknown, Number, Word, Quote }; uint8_t *pl_codeblock; int pl_blockpos; int pl_blocksize; uint8_t* push_opcode_byte(uint8_t val) { if(pl_blockpos>=pl_blocksize) { void* tmp=realloc(pl_codeblock, pl_blocksize+CODEBLOCKSTEP); if(tmp==NULL) { vputs("Out of memory!!"); return; } pl_codeblock=(uint8_t*)tmp; pl_blocksize+=CODEBLOCKSTEP; } pl_codeblock[pl_blockpos]=val; pl_blockpos++; return &pl_codeblock[pl_blockpos-1]; } Opcode* push_opcode(Opcode val) { if(pl_blockpos>=pl_blocksize) { void* tmp=realloc(pl_codeblock, pl_blocksize+CODEBLOCKSTEP); if(tmp==NULL) { vputs("Out of memory!!"); return; } pl_codeblock=(uint8_t*)tmp; pl_blocksize+=CODEBLOCKSTEP; } pl_codeblock[pl_blockpos]=(uint8_t)val; pl_blockpos++; return (Opcode*)&pl_codeblock[pl_blockpos-1]; } uint16_t* push_opcode_word(uint16_t val) { if(pl_blockpos>=pl_blocksize) { void* tmp=realloc(pl_codeblock, pl_blocksize+CODEBLOCKSTEP); if(tmp==NULL) { vputs("Out of memory!!"); return; } pl_codeblock=(uint8_t*)tmp; pl_blocksize+=CODEBLOCKSTEP; } *(uint16_t*)&pl_codeblock[pl_blockpos]=val; pl_blockpos+=2; return (uint16_t*)(&pl_codeblock[pl_blockpos-2]); } uint32_t* push_opcode_dword(uint32_t val) { if(pl_blockpos>=pl_blocksize) { void* tmp=realloc(pl_codeblock, pl_blocksize+CODEBLOCKSTEP); if(tmp==NULL) { vputs("Out of memory!!"); return; } pl_codeblock=(uint8_t*)tmp; pl_blocksize+=CODEBLOCKSTEP; } *(uint32_t*)&pl_codeblock[pl_blockpos]=val; pl_blockpos+=4; return (uint32_t*)&pl_codeblock[pl_blockpos-4]; } void new_codeblock(bool freeit) { if(freeit) { free(pl_codeblock); } pl_codeblock=(uint8_t*)malloc(CODEBLOCKSTEP); pl_blockpos=0; pl_blocksize=CODEBLOCKSTEP; last_target=NULL; } int execute_codeblock() { return forth_execute(pl_codeblock, pl_blockpos); } void push_target(int address) { BranchTarget* target=(BranchTarget*)malloc(sizeof(BranchTarget)); target->previous=last_target; target->target=address; last_target=target; } void pop_target() { if(last_target==NULL) { vputs("Unmatched control statement!\n"); return; } volatile void* tmp=last_target; last_target=last_target->previous; free((void*)tmp); } inline void write_blockword(int pos,uint16_t val) { *(uint16_t*)&pl_codeblock[pos]=val; } int compile_word(char *word, WordType type) //returns 0 for success, 1 for ending word found, -1 for error { if(type==Number){ push_opcode(Push); push_opcode_dword(atoi(word)); }else{ if(word[1]==0) //check the quick builtins first { if(word[0]=='.'){ push_opcode(CallInt); push_opcode_dword((uint32_t)&bi_print); }else if(word[0]==';') { push_opcode(Ret); //execute! return 1; }else if(word[0]=='+'){ push_opcode(Add); }else if(word[0]=='/'){ push_opcode(Div); }else if(word[0]=='-'){ push_opcode(Sub); }else if(word[0]=='!'){ //pl_push(pl_pop()-pl_pop()); }else if(word[0]=='%'){ push_opcode(Mod); }else if(word[0]=='*'){ push_opcode(Mul); }else if(word[0]=='!'){ //push_opcode(Store); }else if(word[0]=='?'){ pl_push(*(int*)pl_pop()); }else if(word[0]=='='){ pl_push(pl_pop() == pl_pop()); }else if(word[0]=='`'){ pl_push(pl_pop()>0); }else if(word[0]=='$'){ //print string (address on stack }else if(word[0]=='['){ //begin quotation push_opcode(Push); push_opcode_word(pl_blockpos+3); push_opcode(Branch); push_target(pl_blockpos); push_opcode_word(0); }else if(word[0] == ']'){ //end quotation push_opcode(Ret); write_blockword(last_target->target, pl_blockpos); pop_target(); } }else if(strlcmp("if", word, 3)==0){ push_opcode(BranchFalse); push_target(pl_blockpos); push_opcode_word(0); }else if(strlcmp("else", word, 5)==0){ push_opcode(Branch); int tmp=pl_blockpos; push_opcode_word(0); write_blockword(last_target->target,pl_blockpos); pop_target(); push_target(tmp); //have to do it after we pop it or we fall into an infinite loop! }else if(strlcmp("end", word, 4)==0){ write_blockword(last_target->target,(uint16_t)pl_blockpos); pop_target(); }else if(strlcmp("tif", word, 4)==0){ /** swap value 2 behind stack to front call.true 1 from stack call.false top of stack _label: **/ //alloca(10); push_opcode(Push); push_opcode_dword(3); push_opcode(Pick); push_opcode(BranchFalse); //push_opcode_word(pl_blockpos+ }else{ vputs("I don't know the word '"); vputs(word); vputs("'\n"); } } return 0; } void parse_line(char *line) { int len=strlen(line); char word[16]; word[0]=0; int wordpos=0; WordType type=Unknown; for(int i=0;i<len;i++) { char c=line[i]; if(is_whitespace(c) || c=='\\') { if(word[0]!=0) { word[wordpos]=0; int tmp=compile_word(word,type); if(tmp==1) { execute_codeblock(); new_codeblock(true); } word[0]=0; } wordpos=0; type=Unknown; if(c=='\\'){ return; //rest is a comment } }else if(is_numeric(c)){ if(type==Unknown){ type=Number; } word[wordpos]=c; wordpos++; }else if(is_quote(c)){ push_opcode(LoadStr); for(;i<len;i++) { //char c=line[ } vputs("This isn't supported yet foo!"); return; }else{ if(type==Number){ vputs("Syntax Error! Unexpected symbol in the middle of a number"); return; } type=Word; word[wordpos]=c; wordpos++; } } } void tester() { printf("foo!"); } int pl_shell() { vputs(">>plEarlz -- A forth-ish shell<<\n"); printheapstats(); vputs("\n"); char *line=(char*)malloc(MAXLINELENGTH); sprintf(line, "Stack Size: %i; Max Recursion Level %i; Loaded WORDs: %i", MAXSTACK, MAXTEMPSTACK, 0); vputs(line); sprintf(line, "Max line length: %i\n", MAXLINELENGTH); vputs(line); new_codeblock(false); char *tmp=(char*)malloc(32); //for constructing words/elements while(1) { vputs("cmd> "); vgetsl(line, MAXLINELENGTH); line[MAXLINELENGTH-1]=0; int len=strlen(line); line[len]='\n'; line[len+1]=0; parse_line(line); } free(line); free(tmp); return 0; }