55 lines
673 B
C
55 lines
673 B
C
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#include <stdint.h>
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#include "uart.h"
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// K&R inspirated
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void printhex(unsigned int d)
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{
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char n;
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for(int c=28;c>=0;c-=4) {
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// get highest tetrad
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n=(d>>c)&0xF;
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// 0-9 => '0'-'9', 10-15 => 'A'-'F'
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n+=n>9?0x37:0x30;
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putc(n);
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}
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}
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int strlen(char s[])
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{
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int i=0;
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while(s[i]!= '\0') {
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++i;
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}
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return i;
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}
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void reverse(char s[])
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{
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int c, i, j;
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for(i=0, j=strlen(s)-1; i<j; i++, j--) {
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c=s[i];
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s[i]=s[j];
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s[j]=c;
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}
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}
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void itoa(unsigned int n, char s[])
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{
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int i=0;
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do {
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s[i++]=n%10+'0';
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} while((n/=10)>0);
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s[i]='\0';
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reverse(s);
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}
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void printdec(unsigned int d)
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{
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char s[16];
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itoa(d, s);
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for(int i=0; i<strlen(s); i++) {
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putc(s[i]);
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}
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}
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