common/print.c

   1 /* Copyright 2012 Jun Wako <wakojun@gmail.com> */
   2 /* Very basic print functions, intended to be used with usb_debug_only.c
   3  * http://www.pjrc.com/teensy/
   4  * Copyright (c) 2008 PJRC.COM, LLC
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include <avr/io.h>
  26 #include <avr/pgmspace.h>
  27 #include "print.h"
  28
  29
  30 #define sendchar(c)    do { if (print_enable && print_sendchar_func) (print_sendchar_func)(c); } while (0)
  31
  32
  33 int8_t (*print_sendchar_func)(uint8_t) = 0;
  34 bool print_enable = true;
  35
  36
  37 /* print string stored in data memory(SRAM)
  38  *     print_P("hello world");
  39  * This consumes precious SRAM memory space for string.
  40  */
  41 void print_S(const char *s)
  42 {
  43     uint8_t c;
  44     while (1) {
  45         c = *s++;
  46         if (!c) break;
  47         if (c == '\n') sendchar('\r');
  48         sendchar(c);
  49     }
  50 }
  51
  52 /* print string stored in program memory(FLASH)
  53  *     print_P(PSTR("hello world");
  54  * This consumes relatively abundant FLASH memory area not SRAM.
  55  */
  56 void print_P(const char *s)
  57 {
  58     uint8_t c;
  59     while (1) {
  60         c = pgm_read_byte(s++);
  61         if (!c) break;
  62         if (c == '\n') sendchar('\r');
  63         sendchar(c);
  64     }
  65 }
  66
  67 void print_CRLF(void)
  68 {
  69     sendchar('\r'); sendchar('\n');
  70 }
  71
  72
  73 #define SIGNED  0x80
  74 #define BIN     2
  75 #define OCT     8
  76 #define DEC     10
  77 #define HEX     16
  78
  79 static inline
  80 char itoc(uint8_t i)
  81 {
  82     return (i < 10 ? '0' + i : 'A' + i - 10);
  83 }
  84
  85 static inline
  86 void print_int(uint16_t data, uint8_t base)
  87 {
  88     char buf[7] = {'\0'};
  89     char *p = &buf[6];
  90     if ((base & SIGNED) && (data & 0x8000)) {
  91         data = -data;
  92         buf[0] = '-';
  93     }
  94     base &= ~SIGNED;
  95     uint16_t n;
  96     do {
  97         n = data;
  98         data /= base;
  99         *(--p) = itoc(n - data*base);
 100     } while (data);
 101     if (buf[0]) *(--p) = buf[0];
 102     print_S(p);
 103 }
 104
 105 void print_dec(uint16_t data)
 106 {
 107     print_int(data, DEC);
 108 }
 109
 110 void print_decs(int16_t data)
 111 {
 112     print_int(data, DEC|SIGNED);
 113 }
 114
 115
 116 static inline
 117 void print_hex4(uint8_t data)
 118 {
 119     sendchar(data + ((data < 10) ? '0' : 'A' - 10));
 120 }
 121
 122 void print_hex8(uint8_t data)
 123 {
 124     print_hex4(data>>4);
 125     print_hex4(data&0x0F);
 126 }
 127
 128 void print_hex16(uint16_t data)
 129 {
 130     print_hex8(data>>8);
 131     print_hex8(data);
 132 }
 133
 134 void print_hex32(uint32_t data)
 135 {
 136     print_hex16(data>>16);
 137     print_hex16(data);
 138 }
 139
 140
 141 void print_bin8(uint8_t data)
 142 {
 143     for (int i = 7; i >= 0; i--) {
 144         sendchar((data & (1<<i)) ? '1' : '0');
 145     }
 146 }
 147
 148 void print_bin16(uint16_t data)
 149 {
 150     print_bin8(data>>8);
 151     print_bin8(data);
 152 }
 153
 154 void print_bin32(uint32_t data)
 155 {
 156     print_bin8(data>>24);
 157     print_bin8(data>>16);
 158     print_bin8(data>>8);
 159     print_bin8(data);
 160 }
 161
 162 void print_bin_reverse8(uint8_t data)
 163 {
 164     for (int i = 0; i < 8; i++) {
 165         sendchar((data & (1<<i)) ? '1' : '0');
 166     }
 167 }
 168
 169 void print_bin_reverse16(uint16_t data)
 170 {
 171     print_bin_reverse8(data);
 172     print_bin_reverse8(data>>8);
 173 }
 174
 175 void print_bin_reverse32(uint32_t data)
 176 {
 177     print_bin_reverse8(data);
 178     print_bin_reverse8(data>>8);
 179     print_bin_reverse8(data>>16);
 180     print_bin_reverse8(data>>24);
 181 }