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  1. #include <stdio.h>
  2. #include <stdint.h>
  3. #include <string.h>
  4.  
  5. void uint16_to_bcd(uint16_t input, uint8_t *bcd) {
  6.     uint8_t i, j;
  7.     bcd[0] = 0; bcd[1] = 0; bcd[2] = 0; bcd[3] = 0; bcd[4] = 0;
  8.     for (i = 0; i < 16; i++) {
  9.         // Коррекция.
  10.         for (j = 0; j < 5; j++) {
  11.             bcd[j] = (bcd[j] >= 0x05) ? (bcd[j] + (uint8_t) 0x03) : bcd[j];
  12.         }
  13.         // Сдвиг.
  14.         bcd[4] = (bcd[4] << 1) | (bcd[3] >> 3);
  15.         bcd[3] = (bcd[3] << 1) | (bcd[2] >> 3);
  16.         bcd[2] = (bcd[2] << 1) | (bcd[1] >> 3);
  17.         bcd[1] = (bcd[1] << 1) | (bcd[0] >> 3);
  18.         bcd[0] = (bcd[0] << 1) | (input >> 15);
  19.         input <<= 1;
  20.         for (j = 0; j < 5; j++) {
  21.             bcd[j] &= 0x0F;
  22.         }
  23.     }
  24. }
  25.  
  26. int test_bcd() {
  27.     uint16_t i;
  28.     uint8_t bcd[5];
  29.     char str1[10];
  30.     char str2[10];
  31.  
  32.     for (i = 0; i < 0xFFFF; i++) {
  33.         uint16_to_bcd(i, bcd);
  34.         sprintf(str1, "%X%X%X%X%X", bcd[4], bcd[3], bcd[2], bcd[1], bcd[0]);
  35.         sprintf(str2, "%05d", i);
  36.         if (strcmp(str1, str2))
  37.             return -1;
  38.     }
  39.     return 0;
  40. }
  41.  
  42. int main() {
  43.     uint8_t bcd[3];
  44.     uint16_to_bcd(12345, bcd);
  45.     printf("example 1: %X %X %X %X %X\n", bcd[4], bcd[3], bcd[2], bcd[1], bcd[0]);
  46.  
  47.     uint16_to_bcd(54679, bcd);
  48.     printf("example 2: %X %X %X %X %X\n", bcd[4], bcd[3], bcd[2], bcd[1], bcd[0]);
  49.  
  50.     if (test_bcd())
  51.         printf("BCD test: FAILED");
  52.     else
  53.         printf("BCD test: OK");
  54. }
  55.  
Success #stdin #stdout 0.02s 9432KB
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Standard input is empty
stdout
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example 1: 1 2 3 4 5
example 2: 5 4 6 7 9
BCD test: OK
https://ideone.com/M8BPus
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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