FreeCalypso > hg > gsm-codec-lib
view dev/efr-sid-insert.c @ 128:a5ffec18e4cd
test programs: use printf %d format for codec parameters
Even though all codec params (both FR and EFR) are small unsigned integers,
we use signed int16_t data type for both, for interface reasons: in the
case of FR it's the gsm_signal type of libgsm, and in the case of EFR
it's the Word16 type of ETSI codec guts. Therefore, the correct printf
format is %d, not %u, when the objective is to see what's in the variables
(what the compiler sees) and catch any bugs.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sun, 11 Dec 2022 04:00:13 +0000 |
parents | 3b5958f28a40 |
children |
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/* * We need to implement a function that inserts the 95 bit wide SID * codeword into the frame, and we would like to do it more efficiently * than calling a "set bit" function for each of the 95 bits. This * program will produce a more efficient solution. */ #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> static const uint8_t SID_codeword_bit_idx[95] = { 45, 46, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 94, 95, 96, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221 }; static void set_bit(uint8_t *frame, unsigned bitnum) { unsigned bytenum = bitnum >> 3; unsigned bit_in_byte = 7 - (bitnum & 7); unsigned bitmask = 1 << bit_in_byte; frame[bytenum] |= bitmask; } main(argc, argv) char **argv; { uint8_t bytes[31]; unsigned n; memset(bytes, 0, 31); for (n = 0; n < 95; n++) set_bit(bytes, SID_codeword_bit_idx[n] + 4); for (n = 0; n < 31; n++) if (bytes[n]) printf("\tframe[%u] |= 0x%02X;\n", n, bytes[n]); exit(0); }