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Nanode Tiny Basic with temperature sensing by @ceejay
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| // TinyBASIC.cpp : An implementation of TinyBASIC in C | |
| // | |
| // Author : Mike Field - hamster@snap.net.nz | |
| // | |
| // Based on TinyBasic for 68000, by Gordon Brandly | |
| // (see http://members.shaw.ca/gbrandly/68ktinyb.html) | |
| // | |
| // which itself was Derived from Palo Alto Tiny BASIC as | |
| // published in the May 1976 issue of Dr. Dobb's Journal. | |
| // | |
| // 0.03 21/01/2011 : Added INPUT routine | |
| // : Reorganised memory layout | |
| // : Expanded all error messages | |
| // : Break key added | |
| // : Removed the calls to printf (left by debugging) | |
| #ifndef ARDUINO | |
| #include "stdafx.h" | |
| #include <conio.h> | |
| #endif | |
| // ASCII Characters | |
| #define CR '\r' | |
| #define NL '\n' | |
| #define TAB '\t' | |
| #define BELL '\b' | |
| #define DEL '\177' | |
| #define SPACE ' ' | |
| #define CTRLC 0x03 | |
| #define CTRLH 0x08 | |
| #define CTRLS 0x13 | |
| #define CTRLX 0x18 | |
| typedef short unsigned LINENUM; | |
| /***********************************************************/ | |
| // Keyword table and constants - the last character has 0x80 added to it | |
| static unsigned char keywords[] = { | |
| 'L','I','S','T'+0x80, | |
| 'L','O','A','D'+0x80, | |
| 'N','E','W'+0x80, | |
| 'R','U','N'+0x80, | |
| 'S','A','V','E'+0x80, | |
| 'N','E','X','T'+0x80, | |
| 'L','E','T'+0x80, | |
| 'I','F'+0x80, | |
| 'G','O','T','O'+0x80, | |
| 'G','O','S','U','B'+0x80, | |
| 'R','E','T','U','R','N'+0x80, | |
| 'R','E','M'+0x80, | |
| 'F','O','R'+0x80, | |
| 'I','N','P','U','T'+0x80, | |
| 'P','R','I','N','T'+0x80, | |
| 'P','O','K','E'+0x80, | |
| 'S','T','O','P'+0x80, | |
| 'B','Y','E'+0x80, | |
| 'D','O','U','T'+0x80, | |
| 'A','O','U','T'+0x80, | |
| 'S','L','E','E','P'+0x80, | |
| 0 | |
| }; | |
| #define KW_LIST 0 | |
| #define KW_LOAD 1 | |
| #define KW_NEW 2 | |
| #define KW_RUN 3 | |
| #define KW_SAVE 4 | |
| #define KW_NEXT 5 | |
| #define KW_LET 6 | |
| #define KW_IF 7 | |
| #define KW_GOTO 8 | |
| #define KW_GOSUB 9 | |
| #define KW_RETURN 10 | |
| #define KW_REM 11 | |
| #define KW_FOR 12 | |
| #define KW_INPUT 13 | |
| #define KW_PRINT 14 | |
| #define KW_POKE 15 | |
| #define KW_STOP 16 | |
| #define KW_BYE 17 | |
| #define KW_DOUT 18 | |
| #define KW_AOUT 19 | |
| #define KW_SLEEP 20 | |
| #define KW_DEFAULT 21 | |
| struct stack_for_frame { | |
| char frame_type; | |
| char for_var; | |
| short int terminal; | |
| short int step; | |
| unsigned char *current_line; | |
| unsigned char *txtpos; | |
| }; | |
| struct stack_gosub_frame { | |
| char frame_type; | |
| unsigned char *current_line; | |
| unsigned char *txtpos; | |
| }; | |
| static unsigned char func_tab[] = { | |
| 'P','E','E','K'+0x80, | |
| 'A','B','S'+0x80, | |
| 'D','I','N'+0x80, | |
| 'A','I','N'+0x80, | |
| 'H','I','G','H'+0x80, | |
| 'L','O','W'+0x80, | |
| 'R','E','A','D','T','E','M','P'+0x80, | |
| 0 | |
| }; | |
| #define FUNC_PEEK 0 | |
| #define FUNC_ABS 1 | |
| #define FUNC_DIN 2 | |
| #define FUNC_AIN 3 | |
| #define FUNC_HIGH 4 | |
| #define FUNC_LOW 5 | |
| #define FUNC_READTEMP 6 | |
| #define FUNC_UNKNOWN 7 | |
| static unsigned char to_tab[] = { | |
| 'T','O'+0x80, | |
| 0 | |
| }; | |
| static unsigned char step_tab[] = { | |
| 'S','T','E','P'+0x80, | |
| 0 | |
| }; | |
| static unsigned char relop_tab[] = { | |
| '>','='+0x80, | |
| '<','>'+0x80, | |
| '>'+0x80, | |
| '='+0x80, | |
| '<','='+0x80, | |
| '<'+0x80, | |
| 0 | |
| }; | |
| #define RELOP_GE 0 | |
| #define RELOP_NE 1 | |
| #define RELOP_GT 2 | |
| #define RELOP_EQ 3 | |
| #define RELOP_LE 4 | |
| #define RELOP_LT 5 | |
| #define RELOP_UNKNOWN 6 | |
| #define VAR_SIZE sizeof(short int) // Size of variables in bytes | |
| static unsigned char memory[1400]; | |
| static unsigned char *txtpos,*list_line; | |
| static unsigned char expression_error; | |
| static unsigned char *tempsp; | |
| static unsigned char *stack_limit; | |
| static unsigned char *program_start; | |
| static unsigned char *program_end; | |
| static unsigned char *stack; // Software stack for things that should go on the CPU stack | |
| static unsigned char *variables_table; | |
| static unsigned char *current_line; | |
| static unsigned char *sp; | |
| #define STACK_GOSUB_FLAG 'G' | |
| #define STACK_FOR_FLAG 'F' | |
| static unsigned char table_index; | |
| static LINENUM linenum; | |
| static const unsigned char okmsg[] = "OK"; | |
| static const unsigned char badlinemsg[] = "Invalid line number"; | |
| static const unsigned char invalidexprmsg[] = "Invalid expression"; | |
| static const unsigned char syntaxmsg[] = "Syntax Error"; | |
| static const unsigned char badinputmsg[] = "\nBad number"; | |
| static const unsigned char nomemmsg[] = "Not enough memory!"; | |
| static const unsigned char initmsg[] = "NanoBasic in C"; | |
| static const unsigned char memorymsg[] = " bytes free."; | |
| static const unsigned char breakmsg[] = "break!"; | |
| static const unsigned char stackstuffedmsg[] = "Stack is stuffed!\n"; | |
| static const unsigned char unimplimentedmsg[] = "Unimplemented"; | |
| static const unsigned char backspacemsg[] = "\b \b"; | |
| static int inchar(void); | |
| static void outchar(unsigned char c); | |
| static void line_terminator(void); | |
| static short int expression(void); | |
| static unsigned char breakcheck(void); | |
| /***************************************************************************/ | |
| static void ignore_blanks(void) | |
| { | |
| while(*txtpos == SPACE || *txtpos == TAB) | |
| txtpos++; | |
| } | |
| /***************************************************************************/ | |
| static void scantable(unsigned char *table) | |
| { | |
| int i = 0; | |
| ignore_blanks(); | |
| table_index = 0; | |
| while(1) | |
| { | |
| // Run out of table entries? | |
| if(table[0] == 0) | |
| return; | |
| // Do we match this character? | |
| if(txtpos[i] == table[0]) | |
| { | |
| i++; | |
| table++; | |
| } | |
| else | |
| { | |
| // do we match the last character of keywork (with 0x80 added)? If so, return | |
| if(txtpos[i]+0x80 == table[0]) | |
| { | |
| txtpos += i+1; // Advance the pointer to following the keyword | |
| ignore_blanks(); | |
| return; | |
| } | |
| // Forward to the end of this keyword | |
| while((table[0] & 0x80) == 0) | |
| table++; | |
| // Now move on to the first character of the next word, and reset the position index | |
| table++; | |
| table_index++; | |
| i = 0; | |
| } | |
| } | |
| } | |
| /***************************************************************************/ | |
| static void pushb(unsigned char b) | |
| { | |
| sp--; | |
| *sp = b; | |
| } | |
| /***************************************************************************/ | |
| static unsigned char popb() | |
| { | |
| unsigned char b; | |
| b = *sp; | |
| sp++; | |
| return b; | |
| } | |
| /***************************************************************************/ | |
| static void printnum(int num) | |
| { | |
| int digits = 0; | |
| if(num < 0) | |
| { | |
| num = -num; | |
| outchar('-'); | |
| } | |
| do { | |
| pushb(num%10+'0'); | |
| num = num/10; | |
| digits++; | |
| } | |
| while (num > 0); | |
| while(digits > 0) | |
| { | |
| outchar(popb()); | |
| digits--; | |
| } | |
| } | |
| /***************************************************************************/ | |
| static unsigned short testnum(void) | |
| { | |
| unsigned short num = 0; | |
| ignore_blanks(); | |
| while(*txtpos>= '0' && *txtpos <= '9' ) | |
| { | |
| // Trap overflows | |
| if(num >= 0xFFFF/10) | |
| { | |
| num = 0xFFFF; | |
| break; | |
| } | |
| num = num *10 + *txtpos - '0'; | |
| txtpos++; | |
| } | |
| return num; | |
| } | |
| /***************************************************************************/ | |
| unsigned char check_statement_end(void) | |
| { | |
| ignore_blanks(); | |
| return (*txtpos == NL) || (*txtpos == ':'); | |
| } | |
| /***************************************************************************/ | |
| static void printmsgNoNL(const unsigned char *msg) | |
| { | |
| while(*msg) | |
| { | |
| outchar(*msg); | |
| msg++; | |
| } | |
| } | |
| /***************************************************************************/ | |
| static unsigned char print_quoted_string(void) | |
| { | |
| int i=0; | |
| unsigned char delim = *txtpos; | |
| if(delim != '"' && delim != '\'') | |
| return 0; | |
| txtpos++; | |
| // Check we have a closing delimiter | |
| while(txtpos[i] != delim) | |
| { | |
| if(txtpos[i] == NL) | |
| return 0; | |
| i++; | |
| } | |
| // Print the characters | |
| while(*txtpos != delim) | |
| { | |
| outchar(*txtpos); | |
| txtpos++; | |
| } | |
| txtpos++; // Skip over the last delimiter | |
| ignore_blanks(); | |
| return 1; | |
| } | |
| /***************************************************************************/ | |
| static void printmsg(const unsigned char *msg) | |
| { | |
| printmsgNoNL(msg); | |
| line_terminator(); | |
| } | |
| /***************************************************************************/ | |
| unsigned char getln(char prompt) | |
| { | |
| outchar(prompt); | |
| txtpos = program_end+sizeof(LINENUM); | |
| while(1) | |
| { | |
| char c = inchar(); | |
| switch(c) | |
| { | |
| case CR: | |
| case NL: | |
| line_terminator(); | |
| // Terminate all strings with a NL | |
| txtpos[0] = NL; | |
| return 1; | |
| case CTRLC: | |
| return 0; | |
| case CTRLH: | |
| if(txtpos == program_end) | |
| break; | |
| txtpos--; | |
| printmsgNoNL(backspacemsg); | |
| break; | |
| default: | |
| // We need to leave at least one space to allow us to shuffle the line into order | |
| if(txtpos == sp-2) | |
| outchar(BELL); | |
| else | |
| { | |
| txtpos[0] = c; | |
| txtpos++; | |
| outchar(c); | |
| } | |
| } | |
| } | |
| } | |
| /***************************************************************************/ | |
| static unsigned char *findline(void) | |
| { | |
| unsigned char *line = program_start; | |
| while(1) | |
| { | |
| if(line == program_end) | |
| return line; | |
| if(((LINENUM *)line)[0] >= linenum) | |
| return line; | |
| // Add the line length onto the current address, to get to the next line; | |
| line += line[sizeof(LINENUM)]; | |
| } | |
| } | |
| /***************************************************************************/ | |
| static void toUppercaseBuffer(void) | |
| { | |
| unsigned char *c = program_end+sizeof(LINENUM); | |
| unsigned char quote = 0; | |
| while(*c != NL) | |
| { | |
| // Are we in a quoted string? | |
| if(*c == quote) | |
| quote = 0; | |
| else if(*c == '"' || *c == '\'') | |
| quote = *c; | |
| else if(quote == 0 && *c >= 'a' && *c <= 'z') | |
| *c = *c + 'A' - 'a'; | |
| c++; | |
| } | |
| } | |
| /***************************************************************************/ | |
| void printline() | |
| { | |
| LINENUM line_num; | |
| line_num = *((LINENUM *)(list_line)); | |
| list_line += sizeof(LINENUM) + sizeof(char); | |
| // Output the line */ | |
| printnum(line_num); | |
| outchar(' '); | |
| while(*list_line != NL) | |
| { | |
| outchar(*list_line); | |
| list_line++; | |
| } | |
| list_line++; | |
| line_terminator(); | |
| } | |
| /***************************************************************************/ | |
| static short int expr4(void) | |
| { | |
| short int a = 0; | |
| if(*txtpos == '0') | |
| { | |
| txtpos++; | |
| a = 0; | |
| goto success; | |
| } | |
| if(*txtpos >= '1' && *txtpos <= '9') | |
| { | |
| do { | |
| a = a*10 + *txtpos - '0'; | |
| txtpos++; | |
| } while(*txtpos >= '0' && *txtpos <= '9'); | |
| goto success; | |
| } | |
| // Is it a function or variable reference? | |
| if(txtpos[0] >= 'A' && txtpos[0] <= 'Z') | |
| { | |
| // Is it a variable reference (single alpha) | |
| if(txtpos[1] < 'A' || txtpos[1] > 'Z') | |
| { | |
| a = ((short int *)variables_table)[*txtpos - 'A']; | |
| txtpos++; | |
| goto success; | |
| } | |
| // Is it a function with a single parameter | |
| scantable(func_tab); | |
| if(table_index == FUNC_UNKNOWN) | |
| goto expr4_error; | |
| unsigned char f = table_index; | |
| // Pseudo Functions added by DCJ for things that need no parms | |
| if (f == FUNC_HIGH) { | |
| a=1; | |
| goto success; | |
| } | |
| if (f == FUNC_LOW) { | |
| a=0; | |
| goto success; | |
| } | |
| if (f == FUNC_READTEMP) { | |
| a = getTempInt(); | |
| goto success; | |
| } | |
| if(*txtpos != '(') | |
| goto expr4_error; | |
| txtpos++; | |
| a = expression(); | |
| if(*txtpos != ')') | |
| goto expr4_error; | |
| txtpos++; | |
| switch(f) | |
| { | |
| case FUNC_PEEK: | |
| a = memory[a]; | |
| goto success; | |
| case FUNC_ABS: | |
| if(a < 0) | |
| a = -a; | |
| goto success; | |
| case FUNC_DIN: | |
| pinMode(a, INPUT); | |
| a = digitalRead(a); | |
| goto success; | |
| case FUNC_AIN: | |
| pinMode(a, INPUT); | |
| a = analogRead(a); | |
| goto success; | |
| } | |
| } | |
| if(*txtpos == '(') | |
| { | |
| txtpos++; | |
| a = expression(); | |
| if(*txtpos != ')') | |
| goto expr4_error; | |
| txtpos++; | |
| goto success; | |
| } | |
| expr4_error: | |
| expression_error = 1; | |
| success: | |
| ignore_blanks(); | |
| return a; | |
| } | |
| /***************************************************************************/ | |
| static short int expr3(void) | |
| { | |
| short int a,b; | |
| a = expr4(); | |
| while(1) | |
| { | |
| if(*txtpos == '*') | |
| { | |
| txtpos++; | |
| b = expr4(); | |
| a *= b; | |
| } | |
| else if(*txtpos == '/') | |
| { | |
| txtpos++; | |
| b = expr4(); | |
| if(b != 0) | |
| a /= b; | |
| else | |
| expression_error = 1; | |
| } | |
| else | |
| return a; | |
| } | |
| } | |
| /***************************************************************************/ | |
| static short int expr2(void) | |
| { | |
| short int a,b; | |
| if(*txtpos == '-' || *txtpos == '+') | |
| a = 0; | |
| else | |
| a = expr3(); | |
| while(1) | |
| { | |
| if(*txtpos == '-') | |
| { | |
| txtpos++; | |
| b = expr3(); | |
| a -= b; | |
| } | |
| else if(*txtpos == '+') | |
| { | |
| txtpos++; | |
| b = expr3(); | |
| a += b; | |
| } | |
| else | |
| return a; | |
| } | |
| } | |
| /***************************************************************************/ | |
| static short int expression(void) | |
| { | |
| short int a,b; | |
| a = expr2(); | |
| // Check if we have an error | |
| if(expression_error) return a; | |
| scantable(relop_tab); | |
| if(table_index == RELOP_UNKNOWN) | |
| return a; | |
| switch(table_index) | |
| { | |
| case RELOP_GE: | |
| b = expr2(); | |
| if(a >= b) return 1; | |
| break; | |
| case RELOP_NE: | |
| b = expr2(); | |
| if(a != b) return 1; | |
| break; | |
| case RELOP_GT: | |
| b = expr2(); | |
| if(a > b) return 1; | |
| break; | |
| case RELOP_EQ: | |
| b = expr2(); | |
| if(a == b) return 1; | |
| break; | |
| case RELOP_LE: | |
| b = expr2(); | |
| if(a <= b) return 1; | |
| break; | |
| case RELOP_LT: | |
| b = expr2(); | |
| if(a < b) return 1; | |
| break; | |
| } | |
| return 0; | |
| } | |
| /***************************************************************************/ | |
| void loop() | |
| { | |
| unsigned char *start; | |
| unsigned char *newEnd; | |
| unsigned char linelen; | |
| variables_table = memory; | |
| program_start = memory + 27*VAR_SIZE; | |
| program_end = program_start; | |
| sp = memory+sizeof(memory); // Needed for printnum | |
| printmsg(initmsg); | |
| printnum(sp-program_end); | |
| printmsg(memorymsg); | |
| // Handle the default ethernet things for nanode | |
| // if (ether.dhcpExpired()) { | |
| // ether.dhcpSetup(); | |
| // } | |
| // word len = ether.packetLoop(ether.packetReceive()); | |
| warmstart: | |
| // this signifies that it is running in 'direct' mode. | |
| current_line = 0; | |
| sp = memory+sizeof(memory); | |
| printmsg(okmsg); | |
| prompt: | |
| while(!getln('>')) | |
| line_terminator(); | |
| toUppercaseBuffer(); | |
| txtpos = program_end+sizeof(unsigned short); | |
| // Find the end of the freshly entered line | |
| while(*txtpos != NL) | |
| txtpos++; | |
| // Move it to the end of program_memory | |
| { | |
| unsigned char *dest; | |
| dest = sp-1; | |
| while(1) | |
| { | |
| *dest = *txtpos; | |
| if(txtpos == program_end+sizeof(unsigned short)) | |
| break; | |
| dest--; | |
| txtpos--; | |
| } | |
| txtpos = dest; | |
| } | |
| // Now see if we have a line number | |
| linenum = testnum(); | |
| ignore_blanks(); | |
| if(linenum == 0) | |
| goto direct; | |
| if(linenum == 0xFFFF) | |
| goto badline; | |
| // Find the length of what is left, including the (yet-to-be-populated) line header | |
| linelen = 0; | |
| while(txtpos[linelen] != NL) | |
| linelen++; | |
| linelen++; // Include the NL in the line length | |
| linelen += sizeof(unsigned short)+sizeof(char); // Add space for the line number and line length | |
| // Now we have the number, add the line header. | |
| txtpos -= 3; | |
| *((unsigned short *)txtpos) = linenum; | |
| txtpos[sizeof(LINENUM)] = linelen; | |
| // Merge it into the rest of the program | |
| start = findline(); | |
| // If a line with that number exists, then remove it | |
| if(start != program_end && *((LINENUM *)start) == linenum) | |
| { | |
| unsigned char *dest, *from; | |
| unsigned tomove; | |
| from = start + start[sizeof(LINENUM)]; | |
| dest = start; | |
| tomove = program_end - from; | |
| while( tomove > 0) | |
| { | |
| *dest = *from; | |
| from++; | |
| dest++; | |
| tomove--; | |
| } | |
| program_end = dest; | |
| } | |
| if(txtpos[sizeof(LINENUM)+sizeof(char)] == NL) // If the line has no txt, it was just a delete | |
| goto prompt; | |
| // Make room for the new line, either all in one hit or lots of little shuffles | |
| while(linelen > 0) | |
| { | |
| unsigned int tomove; | |
| unsigned char *from,*dest; | |
| unsigned int space_to_make; | |
| space_to_make = txtpos - program_end; | |
| if(space_to_make > linelen) | |
| space_to_make = linelen; | |
| newEnd = program_end+space_to_make; | |
| tomove = program_end - start; | |
| // Source and destination - as these areas may overlap we need to move bottom up | |
| from = program_end; | |
| dest = newEnd; | |
| while(tomove > 0) | |
| { | |
| from--; | |
| dest--; | |
| *dest = *from; | |
| tomove--; | |
| } | |
| // Copy over the bytes into the new space | |
| for(tomove = 0; tomove < space_to_make; tomove++) | |
| { | |
| *start = *txtpos; | |
| txtpos++; | |
| start++; | |
| linelen--; | |
| } | |
| program_end = newEnd; | |
| } | |
| goto prompt; | |
| unimplemented: | |
| printmsg(unimplimentedmsg); | |
| goto prompt; | |
| badline: | |
| printmsg(badlinemsg); | |
| goto prompt; | |
| invalidexpr: | |
| printmsg(invalidexprmsg); | |
| goto prompt; | |
| syntaxerror: | |
| printmsg(syntaxmsg); | |
| if(current_line != (void *)0) | |
| { | |
| unsigned char tmp = *txtpos; | |
| if(*txtpos != NL) | |
| *txtpos = '^'; | |
| list_line = current_line; | |
| printline(); | |
| *txtpos = tmp; | |
| } | |
| line_terminator(); | |
| goto prompt; | |
| stackstuffed: | |
| printmsg(stackstuffedmsg); | |
| goto warmstart; | |
| nomem: | |
| printmsg(nomemmsg); | |
| goto warmstart; | |
| run_next_statement: | |
| while(*txtpos == ':') | |
| txtpos++; | |
| ignore_blanks(); | |
| if(*txtpos == NL) | |
| goto execnextline; | |
| goto interperateAtTxtpos; | |
| direct: | |
| txtpos = program_end+sizeof(LINENUM); | |
| if(*txtpos == NL) | |
| goto prompt; | |
| interperateAtTxtpos: | |
| if(breakcheck()) | |
| { | |
| printmsg(breakmsg); | |
| goto warmstart; | |
| } | |
| scantable(keywords); | |
| ignore_blanks(); | |
| switch(table_index) | |
| { | |
| case KW_LIST: | |
| goto list; | |
| case KW_LOAD: | |
| goto unimplemented; ///////////////// | |
| case KW_NEW: | |
| if(txtpos[0] != NL) | |
| goto syntaxerror; | |
| program_end = program_start; | |
| goto prompt; | |
| case KW_RUN: | |
| current_line = program_start; | |
| goto execline; | |
| case KW_SAVE: | |
| goto unimplemented; ////////////////////// | |
| case KW_NEXT: | |
| goto next; | |
| case KW_LET: | |
| goto assignment; | |
| case KW_IF: | |
| { | |
| short int val; | |
| expression_error = 0; | |
| val = expression(); | |
| if(expression_error || *txtpos == NL) | |
| goto invalidexpr; | |
| if(val != 0) | |
| goto interperateAtTxtpos; | |
| goto execnextline; | |
| } | |
| case KW_GOTO: | |
| expression_error = 0; | |
| linenum = expression(); | |
| if(expression_error || *txtpos != NL) | |
| goto invalidexpr; | |
| current_line = findline(); | |
| goto execline; | |
| case KW_GOSUB: | |
| goto gosub; | |
| case KW_RETURN: | |
| goto gosub_return; | |
| case KW_REM: | |
| goto execnextline; // Ignore line completely | |
| case KW_FOR: | |
| goto forloop; | |
| case KW_INPUT: | |
| goto input; | |
| case KW_PRINT: | |
| goto print; | |
| case KW_POKE: | |
| goto poke; | |
| case KW_STOP: | |
| // This is the easy way to end - set the current line to the end of program attempt to run it | |
| if(txtpos[0] != NL) | |
| goto syntaxerror; | |
| current_line = program_end; | |
| goto execline; | |
| case KW_BYE: | |
| // Leave the basic interperater | |
| return; | |
| case KW_DOUT: | |
| goto dout; | |
| case KW_AOUT: | |
| goto aout; | |
| case KW_SLEEP: | |
| goto sleep; | |
| case KW_DEFAULT: | |
| goto assignment; | |
| default: | |
| break; | |
| } | |
| execnextline: | |
| if(current_line == (void *)0) // Processing direct commands? | |
| goto prompt; | |
| current_line += current_line[sizeof(LINENUM)]; | |
| execline: | |
| if(current_line == program_end) // Out of lines to run | |
| goto warmstart; | |
| txtpos = current_line+sizeof(LINENUM)+sizeof(char); | |
| goto interperateAtTxtpos; | |
| input: | |
| { | |
| unsigned char isneg=0; | |
| unsigned char *temptxtpos; | |
| short int *var; | |
| ignore_blanks(); | |
| if(*txtpos < 'A' || *txtpos > 'Z') | |
| goto syntaxerror; | |
| var = ((short int *)variables_table)+*txtpos-'A'; | |
| txtpos++; | |
| if(!check_statement_end()) | |
| goto syntaxerror; | |
| again: | |
| temptxtpos = txtpos; | |
| if(!getln('?')) | |
| goto warmstart; | |
| // Go to where the buffer is read | |
| txtpos = program_end+sizeof(LINENUM); | |
| if(*txtpos == '-') | |
| { | |
| isneg = 1; | |
| txtpos++; | |
| } | |
| *var = 0; | |
| do { | |
| *var = *var*10 + *txtpos - '0'; | |
| txtpos++; | |
| } while(*txtpos >= '0' && *txtpos <= '9'); | |
| ignore_blanks(); | |
| if(*txtpos != NL) | |
| { | |
| printmsg(badinputmsg); | |
| goto again; | |
| } | |
| if(isneg) | |
| *var = -*var; | |
| goto run_next_statement; | |
| } | |
| forloop: | |
| { | |
| unsigned char var; | |
| short int initial, step, terminal; | |
| if(*txtpos < 'A' || *txtpos > 'Z') | |
| goto syntaxerror; | |
| var = *txtpos; | |
| txtpos++; | |
| scantable(relop_tab); | |
| if(table_index != RELOP_EQ) | |
| goto syntaxerror; | |
| expression_error = 0; | |
| initial = expression(); | |
| if(expression_error) | |
| goto invalidexpr; | |
| scantable(to_tab); | |
| if(table_index != 0) | |
| goto syntaxerror; | |
| terminal = expression(); | |
| if(expression_error) | |
| goto invalidexpr; | |
| scantable(step_tab); | |
| if(table_index == 0) | |
| { | |
| step = expression(); | |
| if(expression_error) | |
| goto invalidexpr; | |
| } | |
| else | |
| step = 1; | |
| if(!check_statement_end()) | |
| goto syntaxerror; | |
| if(!expression_error && *txtpos == NL) | |
| { | |
| struct stack_for_frame *f; | |
| if(sp + sizeof(struct stack_for_frame) < stack_limit) | |
| goto nomem; | |
| sp -= sizeof(struct stack_for_frame); | |
| f = (struct stack_for_frame *)sp; | |
| ((short int *)variables_table)[var-'A'] = initial; | |
| f->frame_type = STACK_FOR_FLAG; | |
| f->for_var = var; | |
| f->terminal = terminal; | |
| f->step = step; | |
| f->txtpos = txtpos; | |
| f->current_line = current_line; | |
| goto run_next_statement; | |
| } | |
| } | |
| goto syntaxerror; | |
| gosub: | |
| expression_error = 0; | |
| linenum = expression(); | |
| if(expression_error) | |
| goto invalidexpr; | |
| if(!expression_error && *txtpos == NL) | |
| { | |
| struct stack_gosub_frame *f; | |
| if(sp + sizeof(struct stack_gosub_frame) < stack_limit) | |
| goto nomem; | |
| sp -= sizeof(struct stack_gosub_frame); | |
| f = (struct stack_gosub_frame *)sp; | |
| f->frame_type = STACK_GOSUB_FLAG; | |
| f->txtpos = txtpos; | |
| f->current_line = current_line; | |
| current_line = findline(); | |
| goto execline; | |
| } | |
| goto syntaxerror; | |
| next: | |
| // Fnd the variable name | |
| ignore_blanks(); | |
| if(*txtpos < 'A' || *txtpos > 'Z') | |
| goto syntaxerror; | |
| txtpos++; | |
| if(!check_statement_end()) | |
| goto syntaxerror; | |
| gosub_return: | |
| // Now walk up the stack frames and find the frame we want, if present | |
| tempsp = sp; | |
| while(tempsp < memory+sizeof(memory)-1) | |
| { | |
| switch(tempsp[0]) | |
| { | |
| case STACK_GOSUB_FLAG: | |
| if(table_index == KW_RETURN) | |
| { | |
| struct stack_gosub_frame *f = (struct stack_gosub_frame *)tempsp; | |
| current_line = f->current_line; | |
| txtpos = f->txtpos; | |
| sp += sizeof(struct stack_gosub_frame); | |
| goto run_next_statement; | |
| } | |
| // This is not the loop you are looking for... so Walk back up the stack | |
| tempsp += sizeof(struct stack_gosub_frame); | |
| break; | |
| case STACK_FOR_FLAG: | |
| // Flag, Var, Final, Step | |
| if(table_index == KW_NEXT) | |
| { | |
| struct stack_for_frame *f = (struct stack_for_frame *)tempsp; | |
| // Is the the variable we are looking for? | |
| if(txtpos[-1] == f->for_var) | |
| { | |
| short int *varaddr = ((short int *)variables_table) + txtpos[-1] - 'A'; | |
| *varaddr = *varaddr + f->step; | |
| // Use a different test depending on the sign of the step increment | |
| if((f->step > 0 && *varaddr <= f->terminal) || (f->step < 0 && *varaddr >= f->terminal)) | |
| { | |
| // We have to loop so don't pop the stack | |
| txtpos = f->txtpos; | |
| current_line = f->current_line; | |
| goto run_next_statement; | |
| } | |
| // We've run to the end of the loop. drop out of the loop, popping the stack | |
| sp = tempsp + sizeof(struct stack_for_frame); | |
| goto run_next_statement; | |
| } | |
| } | |
| // This is not the loop you are looking for... so Walk back up the stack | |
| tempsp += sizeof(struct stack_for_frame); | |
| break; | |
| default: | |
| goto stackstuffed; | |
| } | |
| } | |
| // Didn't find the variable we've been looking for | |
| goto syntaxerror; | |
| assignment: | |
| { | |
| short int value; | |
| short int *var; | |
| if(*txtpos < 'A' || *txtpos > 'Z') | |
| goto syntaxerror; | |
| var = (short int *)variables_table + *txtpos - 'A'; | |
| txtpos++; | |
| ignore_blanks(); | |
| if (*txtpos != '=') | |
| goto syntaxerror; | |
| txtpos++; | |
| ignore_blanks(); | |
| expression_error = 0; | |
| value = expression(); | |
| if(expression_error) | |
| goto invalidexpr; | |
| // Check that we are at the end of the statement | |
| if(!check_statement_end()) | |
| goto syntaxerror; | |
| *var = value; | |
| } | |
| goto run_next_statement; | |
| sleep: | |
| { | |
| short int value; | |
| expression_error = 0; | |
| value = expression(); | |
| if(expression_error) | |
| goto invalidexpr; | |
| delay(value); | |
| } | |
| goto run_next_statement; | |
| dout: | |
| { | |
| short int value; | |
| short int var; | |
| // OK - we only handle pins 0 to 9 - but nanode uses 10 upwards for other stuff (mostly ;-) | |
| if(*txtpos < '0' || *txtpos > '9') | |
| goto syntaxerror; | |
| var = *txtpos - '0'; | |
| txtpos++; | |
| ignore_blanks(); | |
| if (*txtpos != '=') | |
| goto syntaxerror; | |
| txtpos++; | |
| ignore_blanks(); | |
| expression_error = 0; | |
| value = expression(); | |
| if(expression_error) | |
| goto invalidexpr; | |
| // Check that we are at the end of the statement | |
| if(!check_statement_end()) | |
| goto syntaxerror; | |
| pinMode(var, OUTPUT); | |
| if(value < 0 || value > 1) | |
| goto syntaxerror; | |
| if(value == 1) | |
| digitalWrite(var, HIGH); | |
| else | |
| digitalWrite(var, LOW); | |
| } | |
| goto run_next_statement; | |
| aout: | |
| { | |
| short int value; | |
| short int var; | |
| // OK - we only handle pins 0 to 9 - but nanode uses 10 upwards for other stuff (mostly ;-) | |
| if(*txtpos < '0' || *txtpos > '9') | |
| goto syntaxerror; | |
| var = *txtpos - '0'; | |
| txtpos++; | |
| ignore_blanks(); | |
| if (*txtpos != '=') | |
| goto syntaxerror; | |
| txtpos++; | |
| ignore_blanks(); | |
| expression_error = 0; | |
| value = expression(); | |
| if(expression_error) | |
| goto invalidexpr; | |
| // Check that we are at the end of the statement | |
| if(!check_statement_end()) | |
| goto syntaxerror; | |
| pinMode(var, OUTPUT); | |
| if (value < 0 || value > 255) | |
| goto syntaxerror; | |
| analogWrite(var, value); | |
| } | |
| goto run_next_statement; | |
| poke: | |
| { | |
| short int value; | |
| unsigned char *address; | |
| // Work out where to put it | |
| expression_error = 0; | |
| value = expression(); | |
| if(expression_error) | |
| goto invalidexpr; | |
| address = (unsigned char *)value; | |
| // check for a comma | |
| ignore_blanks(); | |
| if (*txtpos != ',') | |
| goto syntaxerror; | |
| txtpos++; | |
| ignore_blanks(); | |
| // Now get the value to assign | |
| expression_error = 0; | |
| value = expression(); | |
| if(expression_error) | |
| goto invalidexpr; | |
| // printf("Poke %p value %i\n",address, (unsigned char)value); | |
| // Check that we are at the end of the statement | |
| if(!check_statement_end()) | |
| goto syntaxerror; | |
| } | |
| goto run_next_statement; | |
| list: | |
| linenum = testnum(); // Retuns 0 if no line found. | |
| // Should be EOL | |
| if(txtpos[0] != NL) | |
| goto syntaxerror; | |
| // Find the line | |
| list_line = findline(); | |
| while(list_line != program_end) | |
| printline(); | |
| goto warmstart; | |
| print: | |
| // If we have an empty list then just put out a NL | |
| if(*txtpos == ':' ) | |
| { | |
| line_terminator(); | |
| txtpos++; | |
| goto run_next_statement; | |
| } | |
| if(*txtpos == NL) | |
| { | |
| goto execnextline; | |
| } | |
| while(1) | |
| { | |
| ignore_blanks(); | |
| if(print_quoted_string()) | |
| { | |
| ; | |
| } | |
| else if(*txtpos == '"' || *txtpos == '\'') | |
| goto syntaxerror; | |
| else | |
| { | |
| short int e; | |
| expression_error = 0; | |
| e = expression(); | |
| if(expression_error) | |
| goto invalidexpr; | |
| printnum(e); | |
| } | |
| // At this point we have three options, a comma or a new line | |
| if(*txtpos == ',') | |
| txtpos++; // Skip the comma and move onto the next | |
| else if(txtpos[0] == ';' && (txtpos[1] == NL || txtpos[1] == ':')) | |
| { | |
| txtpos++; // This has to be the end of the print - no newline | |
| break; | |
| } | |
| else if(check_statement_end()) | |
| { | |
| line_terminator(); // The end of the print statement | |
| break; | |
| } | |
| else | |
| goto syntaxerror; | |
| } | |
| goto run_next_statement; | |
| } | |
| /***********************************************************/ | |
| static void line_terminator(void) { | |
| outchar(NL); | |
| outchar(CR); | |
| } | |
| /***********************************************************/ | |
| static unsigned char breakcheck(void) { | |
| #ifdef ARDUINO | |
| if(Serial.available()) | |
| return Serial.read() == CTRLC; | |
| return 0; | |
| #else | |
| if(kbhit()) | |
| return getch() == CTRLC; | |
| else | |
| return 0; | |
| #endif | |
| } | |
| /***********************************************************/ | |
| static int inchar() { | |
| #ifdef ARDUINO | |
| while(1) { | |
| if(Serial.available()) | |
| return Serial.read(); | |
| } | |
| #else | |
| return getch(); | |
| #endif | |
| } | |
| /***********************************************************/ | |
| static void outchar(unsigned char c) { | |
| #ifdef ARDUINO | |
| Serial.write(c); | |
| #else | |
| putch(c); | |
| #endif | |
| } | |
| /***********************************************************/ | |
| #ifdef ARDUINO | |
| void setup() { | |
| Serial.begin(115200); // opens serial port, sets data rate to 115200 bps | |
| } | |
| #endif | |
| /***********************************************************/ | |
| #ifndef ARDUINO | |
| int main() { | |
| while(1) | |
| loop(); | |
| } | |
| #endif | |
| /**********************************************************/ | |
| // Extra functions added by DC-J for grins. | |
| int getTempInt() { | |
| int result = (int) (getTempFloat() + 0.5); | |
| return result; | |
| } | |
| float getTempFloat() { | |
| float result; | |
| int res; | |
| static uint8_t saveADMUX, saveADCSRA; | |
| saveADMUX = ADMUX; | |
| saveADCSRA = ADCSRA; | |
| // Read temperature sensor against 1.1V reference | |
| ADMUX = _BV(REFS1) | _BV(REFS0) | _BV(MUX3); | |
| delay(10); // Wait for Vref to settle | |
| ADCSRA |= _BV(ADSC); // Convert | |
| while (bit_is_set(ADCSRA,ADSC)); | |
| res = ADCL; | |
| res |= ADCH<<8; | |
| result = (float) res; | |
| //result = ((result - 125) * 1075)/10; | |
| result = ((result - 336.59) / 1.17); | |
| ADMUX = saveADMUX; | |
| ADCSRA = saveADCSRA; | |
| return result; | |
| } |
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