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
forth_machine.cpp@11:fede136943a9, 2012-09-28 (annotated)
- Committer:
- earlz
- Date:
- Fri Sep 28 04:03:54 2012 +0000
- Revision:
- 11:fede136943a9
- Parent:
- 9:4211d638b2e9
- Child:
- 13:442bd2fb4ea0
Finally have keyboard support, AND it plays nice with VGA
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
earlz | 6:a4dff59ef214 | 1 | #include "mbedconsole.h" |
earlz | 6:a4dff59ef214 | 2 | #include "plEarlz.h" |
earlz | 6:a4dff59ef214 | 3 | #include <stdint.h> |
earlz | 6:a4dff59ef214 | 4 | #include <stdarg.h> |
earlz | 6:a4dff59ef214 | 5 | |
earlz | 6:a4dff59ef214 | 6 | |
earlz | 6:a4dff59ef214 | 7 | //An extremely simple virtual machine to make this implementation about 10 times easier and probably a bit faster |
earlz | 6:a4dff59ef214 | 8 | |
earlz | 6:a4dff59ef214 | 9 | |
earlz | 6:a4dff59ef214 | 10 | |
earlz | 6:a4dff59ef214 | 11 | |
earlz | 6:a4dff59ef214 | 12 | |
earlz | 6:a4dff59ef214 | 13 | int pl_stackpos=0; |
earlz | 6:a4dff59ef214 | 14 | int pl_stack[MAXSTACK]; |
earlz | 6:a4dff59ef214 | 15 | |
earlz | 6:a4dff59ef214 | 16 | |
earlz | 6:a4dff59ef214 | 17 | |
earlz | 6:a4dff59ef214 | 18 | |
earlz | 6:a4dff59ef214 | 19 | int pl_dictionary_count=0; |
earlz | 6:a4dff59ef214 | 20 | int pl_dictionary_size=0; |
earlz | 6:a4dff59ef214 | 21 | WordKey *pl_dictionary; //todo: a hash table would be much faster |
earlz | 6:a4dff59ef214 | 22 | |
earlz | 6:a4dff59ef214 | 23 | void pl_push(int val) |
earlz | 6:a4dff59ef214 | 24 | { |
earlz | 6:a4dff59ef214 | 25 | if(pl_stackpos>=MAXSTACK) |
earlz | 6:a4dff59ef214 | 26 | { |
earlz | 6:a4dff59ef214 | 27 | vputs("Stack overflow!"); |
earlz | 6:a4dff59ef214 | 28 | pl_error=StackOverflow; |
earlz | 6:a4dff59ef214 | 29 | return; |
earlz | 6:a4dff59ef214 | 30 | } |
earlz | 6:a4dff59ef214 | 31 | pl_stack[pl_stackpos]=val; |
earlz | 6:a4dff59ef214 | 32 | pl_stackpos++; |
earlz | 6:a4dff59ef214 | 33 | } |
earlz | 6:a4dff59ef214 | 34 | int pl_pop() |
earlz | 6:a4dff59ef214 | 35 | { |
earlz | 6:a4dff59ef214 | 36 | if(pl_stackpos<=0) |
earlz | 6:a4dff59ef214 | 37 | { |
earlz | 6:a4dff59ef214 | 38 | vputs("Stack underflow!"); |
earlz | 6:a4dff59ef214 | 39 | pl_error=StackUnderflow; |
earlz | 6:a4dff59ef214 | 40 | return 0; |
earlz | 6:a4dff59ef214 | 41 | } |
earlz | 6:a4dff59ef214 | 42 | pl_stackpos--; |
earlz | 6:a4dff59ef214 | 43 | return pl_stack[pl_stackpos]; |
earlz | 6:a4dff59ef214 | 44 | } |
earlz | 6:a4dff59ef214 | 45 | |
earlz | 6:a4dff59ef214 | 46 | WordKey *pl_lookup(char* name) |
earlz | 6:a4dff59ef214 | 47 | { |
earlz | 6:a4dff59ef214 | 48 | for(int i=0;i<pl_dictionary_count;i++) |
earlz | 6:a4dff59ef214 | 49 | { |
earlz | 6:a4dff59ef214 | 50 | if(strlcmp(name, pl_dictionary[i].name, 12)==0) |
earlz | 6:a4dff59ef214 | 51 | { |
earlz | 6:a4dff59ef214 | 52 | return &pl_dictionary[i]; |
earlz | 6:a4dff59ef214 | 53 | } |
earlz | 6:a4dff59ef214 | 54 | } |
earlz | 6:a4dff59ef214 | 55 | return NULL; |
earlz | 6:a4dff59ef214 | 56 | } |
earlz | 6:a4dff59ef214 | 57 | |
earlz | 6:a4dff59ef214 | 58 | int pl_addword() |
earlz | 6:a4dff59ef214 | 59 | { |
earlz | 6:a4dff59ef214 | 60 | if(pl_dictionary_size==0){ |
earlz | 6:a4dff59ef214 | 61 | pl_dictionary=(WordKey*)malloc(sizeof(WordKey)*12); |
earlz | 6:a4dff59ef214 | 62 | pl_dictionary_size=12; |
earlz | 6:a4dff59ef214 | 63 | return 0; |
earlz | 6:a4dff59ef214 | 64 | } |
earlz | 6:a4dff59ef214 | 65 | if(pl_dictionary_size<=pl_dictionary_count) |
earlz | 6:a4dff59ef214 | 66 | { |
earlz | 6:a4dff59ef214 | 67 | void* tmp=realloc(pl_dictionary, pl_dictionary_size+sizeof(WordKey)*DICTIONARYSTEP); |
earlz | 6:a4dff59ef214 | 68 | if(tmp==NULL) |
earlz | 6:a4dff59ef214 | 69 | { |
earlz | 6:a4dff59ef214 | 70 | vputs("Out of memory!! Epic Fail!!"); |
earlz | 6:a4dff59ef214 | 71 | return -1; |
earlz | 6:a4dff59ef214 | 72 | } |
earlz | 6:a4dff59ef214 | 73 | pl_dictionary=(WordKey*)tmp; |
earlz | 6:a4dff59ef214 | 74 | pl_dictionary_size+=sizeof(WordKey)*DICTIONARYSTEP; |
earlz | 6:a4dff59ef214 | 75 | } |
earlz | 6:a4dff59ef214 | 76 | return pl_dictionary_count++; |
earlz | 6:a4dff59ef214 | 77 | } |
earlz | 6:a4dff59ef214 | 78 | |
earlz | 9:4211d638b2e9 | 79 | int pl_tempstack[MAXTEMPSTACK]; |
earlz | 9:4211d638b2e9 | 80 | int pl_temppos=0; |
earlz | 9:4211d638b2e9 | 81 | void pl_temppush(int val) |
earlz | 9:4211d638b2e9 | 82 | { |
earlz | 9:4211d638b2e9 | 83 | if(pl_temppos>=MAXTEMPSTACK) |
earlz | 9:4211d638b2e9 | 84 | { |
earlz | 9:4211d638b2e9 | 85 | vputs("Temporary stack overflow\n"); |
earlz | 9:4211d638b2e9 | 86 | return; |
earlz | 9:4211d638b2e9 | 87 | } |
earlz | 9:4211d638b2e9 | 88 | pl_tempstack[pl_temppos]=val; |
earlz | 9:4211d638b2e9 | 89 | pl_temppos++; |
earlz | 9:4211d638b2e9 | 90 | } |
earlz | 9:4211d638b2e9 | 91 | int pl_temppop() |
earlz | 9:4211d638b2e9 | 92 | { |
earlz | 9:4211d638b2e9 | 93 | if(pl_temppos<=0) |
earlz | 9:4211d638b2e9 | 94 | { |
earlz | 9:4211d638b2e9 | 95 | vputs("Temporary stack underflow\n"); |
earlz | 9:4211d638b2e9 | 96 | return 0; |
earlz | 9:4211d638b2e9 | 97 | } |
earlz | 9:4211d638b2e9 | 98 | return pl_tempstack[pl_temppos--]; |
earlz | 9:4211d638b2e9 | 99 | } |
earlz | 6:a4dff59ef214 | 100 | |
earlz | 6:a4dff59ef214 | 101 | int forth_execute(uint8_t* block, int length) |
earlz | 6:a4dff59ef214 | 102 | { |
earlz | 7:2ac6752d47d2 | 103 | uint16_t pos=0; |
earlz | 8:f356684767ef | 104 | printf("block length: %x\r\n",length); |
earlz | 6:a4dff59ef214 | 105 | while(pos<length) |
earlz | 6:a4dff59ef214 | 106 | { |
earlz | 8:f356684767ef | 107 | //serial.getc(); |
earlz | 6:a4dff59ef214 | 108 | Opcode op=(Opcode)block[pos]; |
earlz | 8:f356684767ef | 109 | printf("pos: %x -- opcode: %x\r\n",(int)pos, (int)op); |
earlz | 6:a4dff59ef214 | 110 | switch(op) |
earlz | 6:a4dff59ef214 | 111 | { |
earlz | 6:a4dff59ef214 | 112 | case BranchTrue: |
earlz | 6:a4dff59ef214 | 113 | if(pl_pop()){ |
earlz | 6:a4dff59ef214 | 114 | pos++; |
earlz | 6:a4dff59ef214 | 115 | pos=*((uint16_t*)&block[pos]); |
earlz | 7:2ac6752d47d2 | 116 | |
earlz | 6:a4dff59ef214 | 117 | }else{ |
earlz | 6:a4dff59ef214 | 118 | pos+=3; |
earlz | 6:a4dff59ef214 | 119 | } |
earlz | 6:a4dff59ef214 | 120 | break; |
earlz | 6:a4dff59ef214 | 121 | case BranchFalse: |
earlz | 6:a4dff59ef214 | 122 | if(!pl_pop()){ |
earlz | 6:a4dff59ef214 | 123 | pos++; |
earlz | 8:f356684767ef | 124 | serial.printf("branch false %x\r\n",(int)pos); |
earlz | 6:a4dff59ef214 | 125 | pos=*((uint16_t*)&block[pos]); |
earlz | 7:2ac6752d47d2 | 126 | serial.printf("branch false %x\r\n",(int)pos); |
earlz | 6:a4dff59ef214 | 127 | }else{ |
earlz | 6:a4dff59ef214 | 128 | pos+=3; |
earlz | 7:2ac6752d47d2 | 129 | serial.printf("branch false skip %x\r\n", (int)pos); |
earlz | 6:a4dff59ef214 | 130 | } |
earlz | 6:a4dff59ef214 | 131 | break; |
earlz | 6:a4dff59ef214 | 132 | case Branch: |
earlz | 6:a4dff59ef214 | 133 | pos++; |
earlz | 6:a4dff59ef214 | 134 | pos=*((uint16_t*)&block[pos]); |
earlz | 6:a4dff59ef214 | 135 | break; |
earlz | 6:a4dff59ef214 | 136 | case Push: |
earlz | 6:a4dff59ef214 | 137 | pos++; |
earlz | 6:a4dff59ef214 | 138 | pl_push(*(uint32_t*)&block[pos]); |
earlz | 6:a4dff59ef214 | 139 | pos+=4; |
earlz | 6:a4dff59ef214 | 140 | break; |
earlz | 9:4211d638b2e9 | 141 | case Drop: |
earlz | 6:a4dff59ef214 | 142 | pos++; |
earlz | 6:a4dff59ef214 | 143 | pl_pop(); |
earlz | 6:a4dff59ef214 | 144 | break; |
earlz | 6:a4dff59ef214 | 145 | case Add: |
earlz | 6:a4dff59ef214 | 146 | pos++; |
earlz | 6:a4dff59ef214 | 147 | pl_push(pl_pop()+pl_pop()); |
earlz | 6:a4dff59ef214 | 148 | break; |
earlz | 6:a4dff59ef214 | 149 | case Sub: |
earlz | 6:a4dff59ef214 | 150 | pos++; |
earlz | 6:a4dff59ef214 | 151 | pl_push(pl_pop()-pl_pop()); |
earlz | 6:a4dff59ef214 | 152 | break; |
earlz | 6:a4dff59ef214 | 153 | case Mul: |
earlz | 6:a4dff59ef214 | 154 | pos++; |
earlz | 6:a4dff59ef214 | 155 | pl_push(pl_pop()*pl_pop()); |
earlz | 6:a4dff59ef214 | 156 | break; |
earlz | 6:a4dff59ef214 | 157 | case Div: |
earlz | 6:a4dff59ef214 | 158 | pos++; |
earlz | 6:a4dff59ef214 | 159 | pl_push(pl_pop()/pl_pop()); |
earlz | 6:a4dff59ef214 | 160 | break; |
earlz | 6:a4dff59ef214 | 161 | case Mod: |
earlz | 6:a4dff59ef214 | 162 | pos++; |
earlz | 6:a4dff59ef214 | 163 | pl_push(pl_pop()%pl_pop()); |
earlz | 6:a4dff59ef214 | 164 | break; |
earlz | 8:f356684767ef | 165 | case Cgt: |
earlz | 8:f356684767ef | 166 | pos++; |
earlz | 8:f356684767ef | 167 | pl_push(pl_pop()>pl_pop()); |
earlz | 8:f356684767ef | 168 | break; |
earlz | 8:f356684767ef | 169 | case Clt: |
earlz | 8:f356684767ef | 170 | pos++; |
earlz | 8:f356684767ef | 171 | pl_push(pl_pop()<pl_pop()); |
earlz | 8:f356684767ef | 172 | break; |
earlz | 8:f356684767ef | 173 | case Cgte: |
earlz | 8:f356684767ef | 174 | pos++; |
earlz | 8:f356684767ef | 175 | pl_push(pl_pop()>=pl_pop()); |
earlz | 8:f356684767ef | 176 | break; |
earlz | 8:f356684767ef | 177 | case Clte: |
earlz | 8:f356684767ef | 178 | pos++; |
earlz | 8:f356684767ef | 179 | pl_push(pl_pop()<=pl_pop()); |
earlz | 8:f356684767ef | 180 | break; |
earlz | 8:f356684767ef | 181 | case Ceq: |
earlz | 8:f356684767ef | 182 | pos++; |
earlz | 8:f356684767ef | 183 | pl_push(pl_pop()==pl_pop()); |
earlz | 8:f356684767ef | 184 | break; |
earlz | 8:f356684767ef | 185 | case Cneq: |
earlz | 8:f356684767ef | 186 | pos++; |
earlz | 8:f356684767ef | 187 | pl_push(pl_pop()!=pl_pop()); |
earlz | 8:f356684767ef | 188 | break; |
earlz | 9:4211d638b2e9 | 189 | case CallInt:{ |
earlz | 6:a4dff59ef214 | 190 | pos++; |
earlz | 6:a4dff59ef214 | 191 | uint32_t tmp=*(uint32_t*)&block[pos]; |
earlz | 6:a4dff59ef214 | 192 | ((BuiltinFunction)tmp)(); |
earlz | 6:a4dff59ef214 | 193 | pos+=4; |
earlz | 9:4211d638b2e9 | 194 | break;} |
earlz | 9:4211d638b2e9 | 195 | case Swap:{ |
earlz | 9:4211d638b2e9 | 196 | pos++; |
earlz | 9:4211d638b2e9 | 197 | int tmp=pl_pop(); |
earlz | 9:4211d638b2e9 | 198 | int tmp2=pl_pop(); |
earlz | 9:4211d638b2e9 | 199 | pl_push(tmp); |
earlz | 9:4211d638b2e9 | 200 | pl_push(tmp2); |
earlz | 6:a4dff59ef214 | 201 | break; |
earlz | 9:4211d638b2e9 | 202 | } |
earlz | 9:4211d638b2e9 | 203 | case PushTemp: |
earlz | 9:4211d638b2e9 | 204 | pos++; |
earlz | 9:4211d638b2e9 | 205 | pl_temppush(pl_pop()); |
earlz | 9:4211d638b2e9 | 206 | break; |
earlz | 9:4211d638b2e9 | 207 | case PopTemp: |
earlz | 9:4211d638b2e9 | 208 | pos++; |
earlz | 9:4211d638b2e9 | 209 | pl_push(pl_temppop()); |
earlz | 9:4211d638b2e9 | 210 | case Pick:{ |
earlz | 9:4211d638b2e9 | 211 | pos++; |
earlz | 9:4211d638b2e9 | 212 | int tmp=pl_pop(); |
earlz | 9:4211d638b2e9 | 213 | if(pl_stackpos-tmp>0){ |
earlz | 9:4211d638b2e9 | 214 | pl_push(pl_stack[pl_stackpos-tmp]); |
earlz | 9:4211d638b2e9 | 215 | |
earlz | 9:4211d638b2e9 | 216 | }else{ |
earlz | 9:4211d638b2e9 | 217 | pl_push(0); |
earlz | 9:4211d638b2e9 | 218 | vputs("Stack underflow on pick\n"); |
earlz | 9:4211d638b2e9 | 219 | } |
earlz | 9:4211d638b2e9 | 220 | break;} |
earlz | 7:2ac6752d47d2 | 221 | case Ret: |
earlz | 8:f356684767ef | 222 | return 0; |
earlz | 6:a4dff59ef214 | 223 | |
earlz | 6:a4dff59ef214 | 224 | |
earlz | 6:a4dff59ef214 | 225 | default: |
earlz | 6:a4dff59ef214 | 226 | vputs("Unknown opcode!!"); |
earlz | 6:a4dff59ef214 | 227 | return; |
earlz | 6:a4dff59ef214 | 228 | } |
earlz | 6:a4dff59ef214 | 229 | } |
earlz | 6:a4dff59ef214 | 230 | return 0; |
earlz | 6:a4dff59ef214 | 231 | } |