c_sources.zip_PURE

#include <stdio.h> #include <stdint.h> void print_bits(size_t const size, void const * const ptr) { unsigned char *b = (unsigned char*) ptr; unsigned char byte; int i, j; for (i = size - 1; i >= 0; --i) { for (j=7; j>=0; --j) { byte = b[i] & (1<<j); byte >>= j; printf("%u", byte); } printf(" "); } puts(""); } /* To split numbers into Little Endian format */ #define WORD_CHARS(x) (x&0xff), ((x>>8)&0xff), ((x>>16)&0xff), ((x>>24)&0xff) #define SHORT_CHARS(x) (x&0xff), ((x>>8)&0xff) int test_bit_shifting(void) { // form uint32_t having uint8_t uint8_t v4[4] = {1, 2, 3, 4}; uint32_t i32_00 = v4[0] | (v4[1] << 8) | (v4[2] << 16) | (v4[3] << 24); print_bits(4, &i32_00); // form uint32_t having uint8_t uint32_t i32_01 = 0; i32_01 |= (v4[0] << 0); i32_01 |= (v4[1] << 8); i32_01 |= (v4[2] << 16); i32_01 |= (v4[3] << 24); print_bits(4, &i32_01); // form uint32_t having uint8_t uint32_t i32_02 = 0; uint8_t b1 = 1; uint8_t b2 = 2; uint8_t b3 = 3; uint8_t b4 = 4; i32_02 |= (b1 << 0); i32_02 |= (b2 << 8); i32_02 |= (b3 << 16); i32_02 |= (b4 << 24); print_bits(4, &i32_02); // form uint32_t having uint8_t & uint16_t uint32_t i32_03 = 0; uint8_t b11 = 1; uint8_t b22 = 2; uint16_t b33 = 3; i32_03 |= (b11 << 0); i32_03 |= (b22 << 8); i32_03 |= (b33 << 16); print_bits(4, &i32_03); uint8_t b222 = 2; b222 = b222 << 8; print_bits(1, &b222); return 0; } void test_bit_set_clear() { #define BIT_SET(a,b) ((a) |= (1<<(b))) #define BIT_CLEAR(a,b) ((a) &= ~(1<<(b))) #define BIT_FLIP(a,b) ((a) ^= (1<<(b))) #define BIT_CHECK(a,b) ((a) & (1<<(b))) uint8_t a = 0; /* set bit */ a |= (1 << 1); print_bits(1, &a); /* clear bit */ a &= ~(1 << 1); print_bits(1, &a); /* flip bit */ a ^= (1 << 1); print_bits(1, &a); uint8_t res = a & (1 << 0); if (res) printf("bit is set: res: %d\n", res); else printf("bit is not set: res: %d\n", res); uint16_t wMaxPacketSize = 1024 | 0x1000; /* set bit */ print_bits(2, &wMaxPacketSize); } int main() { test_bit_set_clear(); return 0; }