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I've been learning about uart recently and i was wondering how to use it on the 80C52. Assuming i have space, im going to put a gps and maybe 3g module in there somewhere. For the gps i wanted to use navit of course, but does navit have like a uart input? or will it just... work? I don't really know what im tring to ask
here is some code
#ifndef __LCD_H__ #define __LCD_H__ void lcd_init(void); void delay(); void control_word(unsigned char ch); void data_word(unsigned char ch); void wrt_value(unsigned char x); void cursorxy(unsigned char x, unsigned char y); void disp_str(unsigned char msg[]); void wrt_string(unsigned char *string); void wrt_long(unsigned long a); void wrt_char(unsigned char a); void wrt_int(unsigned int a); void wrt_dec_char(unsigned char x); void wrt_dec_long(unsigned long a); void wrt_dec_int(unsigned int a); void wrt_2dec_place(unsigned char a); void wrt_float(float a); #endif #include <reg51.h> #define LCD P2 // lcd connected to this port void delay() { unsigned char i; for (i=0; i<255 ;i++); } void control_word(unsigned char ch) { unsigned char copy; copy = ch; //save a copy of it ch = ch >> 4; //get the higher nibble ch = ch & 0x0f; // -- do -- ch = ch | 0x20; // add E(bit 6) & RS (bit 5) LCD = ch; //out to lcd data port HIGHER nibble with E=1, RS=0 ch = ch & 0x0f; // make E=0, RS=0 with higher nibble LCD = ch; //out to lcd data port higher nibble with E=0, RS=0 ch = copy; //get original byte ch = ch & 0x0f; //to get lower nibble ch = ch | 0x20; // E=1, RS=0 LCD = ch; //out to lcd data port LOWER nibble with E=1, RS=0 ch = ch & 0x0f; // make E=0, RS=0 LCD = ch; //out to lcd data port lower nibble with E=0, RS=0 delay(); // give some delay here // } void data_word(unsigned char ch) { unsigned char copy; copy = ch; //save a copy of it ch = ch >> 4; //get the higher nibble ch = ch & 0x0f; // -- do -- ch = ch | 0x30; // add E(bit 6) & RS (bit 5) LCD = ch; //out to lcd data port HIGHER nibble with E=1, RS=1 ch = ch & 0x1f; // make E=0, RS=1 with higher nibble LCD = ch; //out to lcd data port higher nibble with E=0, RS=1 ch = copy; //get original byte ch = ch & 0x0f; //to get lower nibble ch = ch | 0x30; // E=1, RS=1 LCD = ch; //out to lcd data port LOWER nibble with E=1, RS=1 ch = ch & 0x1f; // make E=0, RS=1 LCD = ch; //out to lcd data port lower nibble with E=0, RS=1 delay(); // give some delay here } void lcd_init(void) { control_word(0x28);// 4bit, 2lines, 5x7 control_word(0x28);// again control_word(0x0E);// disp On, cursor On, no blink control_word(0x01);// clear LCD control_word(0x06);// CUR_RIGHT control_word(0x80);// line 1 cur. position 0 } void disp_str(unsigned char msg[]) { unsigned char i; while(msg != '\0') { data_word(msg[i++]); } } /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Bringing Cursor to (X,Y) location of LCD X -> 1,2 Y -> 1,16 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/ void cursorxy(unsigned char x, unsigned char y) { if((x<1||x>2)&&(y<1||y>16)) { x=1; y=1; } if(x == 1) control_word(0x7F+y); else control_word(0xBF+y); } void wrt_value(unsigned char x) { unsigned char temp; temp = x/0x10; if(temp>9) return; else data_word(temp+0x30); temp = x%0x10; if(temp>9) return; else data_word(temp+0x30); } /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Writing string to LCD ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/ void wrt_string(unsigned char *string) { delay(); while(*string) data_word(*string++); } //----------------------------------------------- void wrt_long(unsigned long a) { unsigned char i; unsigned char b,c[8]={48,48,48,48,48,48,48,48}; for(i = 7;a > 0;i--) { b = a % 16; if(b <= 9) b = b + 48; else b = b + 55; a = a / 16; c = b; } for(i =0; i<=7;i++) data_word(c); } //----------------------------------------------- void wrt_int(unsigned int a) { unsigned char i; unsigned char b,c[4]={48,48,48,48}; for(i = 3;a > 0;i--) { b = a % 16; if(b <= 9) b = b + 48; else b = b + 55; a = a / 16; c = b; } for(i =0; i<=3;i++) data_word(c); } //----------------------------------------------- void wrt_char(unsigned char x) { unsigned char temp; temp = x/0x10; if(temp>9) data_word(temp+55); else data_word(temp+48); temp = x%0x10; if(temp>9) data_word(temp+55); else data_word(temp+48); } //------------------------------------ void wrt_dec_char(unsigned char a) { unsigned char i; unsigned char b,c[3]={48,48,48}; for(i = 2;a > 0;i--) { b = a % 10; b = b + 48; a = a / 10; c = b; } for(i =0; i<=2;i++) data_word(c); } //----------------------------------------------- void wrt_dec_long(unsigned long a) { unsigned char i; unsigned char b,c[10]={48,48,48,48,48,48,48,48,48,48}; for(i = 9;a > 0;i--) { b = a % 10; b = b + 48; a = a / 10; c = b; } for(i =0; i<=9;i++) data_word(c); } //----------------------------------------------- void wrt_dec_int(unsigned int a) { unsigned char i; unsigned char b,c[5]={48,48,48,48,48}; for(i = 4;a > 0;i--) { b = a % 10; b = b + 48; a = a / 10; c = b; } for(i =0; i<=4;i++) data_word(c); } //------------------------------------ void wrt_2dec_place(unsigned char a) /* function to write the fractional part after decimal upto two decimal places INPUT : the decimal part as unsigned char */ { unsigned char i; unsigned char b,c[2]={48,48}; for(i = 1;a > 0;i--) { b = a % 10; b = b + 48; a = a / 10; c = b; } for(i =0; i<=1;i++) data_word(c); } //------------------------------------ void wrt_float(float a) /* function to write the floating point number upto two decimal places INPUT : floating point number OUTPUT : xxxxx.yy on lcd at current cursor position */ { unsigned int i; unsigned char j; i = (unsigned int)a; wrt_dec_int(i); wrt_string("."); j = (unsigned char)((a - i) * 100); wrt_2dec_place(j); } //-----------------------------------------------
indeed there is - but does it have anything at all to do with this thread??