Files
Last update 8 years 9 months
by
Raivo Laanemets
| Filesavrsrc | |
|---|---|
| .. | |
| adc.c | |
| adjust.c | |
| error.c | |
| fans.c | |
| hex.c | |
| init.c | |
| init_fans.c | |
| main.c | |
| measure.c | |
| pearson.c | |
| protocol.c | |
| rpm.c | |
| usart_buffer.c | |
| usart_run.c |
hex.c// Decodes single hex character. uint8_t hex_decode_single(uint8_t ch) { switch (ch) { case '0': return 0; case '1': return 1; case '2': return 2; case '3': return 3; case '4': return 4; case '5': return 5; case '6': return 6; case '7': return 7; case '8': return 8; case '9': return 9; case 'a': return 10; case 'b': return 11; case 'c': return 12; case 'd': return 13; case 'e': return 14; case 'f': return 15; } return 0; } // Returns hex encoding of lower // nibble of the given value. uint8_t hex_encode_single(uint8_t value) { switch (value & 0x0F) { case 0: return '0'; case 1: return '1'; case 2: return '2'; case 3: return '3'; case 4: return '4'; case 5: return '5'; case 6: return '6'; case 7: return '7'; case 8: return '8'; case 9: return '9'; case 10: return 'a'; case 11: return 'b'; case 12: return 'c'; case 13: return 'd'; case 14: return 'e'; case 15: return 'f'; } return '0'; } // Decodes len hex characters from source. // len must be an even number. void hex_decode(volatile uint8_t *source, volatile uint8_t *dest, uint8_t len) { uint8_t bytes = len/2; for (uint8_t i = 0; i < bytes; i++) { uint8_t higher = hex_decode_single(source[i * 2]); uint8_t lower = hex_decode_single(source[i * 2 + 1]); dest[i] = (higher << 4) + lower; } } // Encodes len bytes from source to hex // in the dest buffer. void hex_encode(volatile uint8_t *source, volatile uint8_t *dest, uint8_t len) { for (uint8_t i = 0; i < len; i++) { dest[i * 2] = hex_encode_single(source[i] >> 4); dest[i * 2 + 1] = hex_encode_single(source[i]); } }