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Move the CRC8 code into utility

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hkz 2025-09-01 08:42:13 +02:00
commit 0f34399cca
4 changed files with 17 additions and 45 deletions
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2
Makefile
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@ -16,7 +16,7 @@ GAME_PRG=game
LIBS=clib-6502.a
MASTER_ASM_SRCS = tk2k_startup_master.s disk2.s master_func.s
MASTER_C_SRCS = master_main.c dos_floppy.c
MASTER_C_SRCS = master_main.c dos_floppy.c utility.c
INTRO_ASM_SRCS = tk2k_startup_module.s preserve_zero_pages.s
INTRO_C_SRCS = intro_main.c utility.c

21
src/master_main.c
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@ -51,7 +51,6 @@ static uint16_t file_load_address[FILE_LIST_LEN] = { // This will hold the load
static void init(void);
static void init_floppy_data(uint8_t *cur_trk, uint8_t *cur_file);
static uint8_t fill_trksec_list(uint8_t* cur_trk);
static uint8_t calculate_crc8(uint8_t* data, uint8_t len);
// Low level initialization
static void init(void) {
@ -117,26 +116,6 @@ static void init_floppy_data(uint8_t *cur_trk, uint8_t *cur_file) {
if (!initialized_correctly) __asm volatile(" brk\n":::);
}
#define CRC8RDALLAS_POLY 0x31
static uint8_t calculate_crc8(uint8_t* data, uint8_t len) {
uint8_t crc = 0;
for(uint8_t data_idx = 0; data_idx < len; data_idx++) {
uint8_t carry;
uint8_t d = data[data_idx];
for (uint8_t i = 8; i > 0; i--) {
carry = (crc & 0x80);
crc <<= 1;
if (d & 1) crc |= 1;
d >>= 1;
if (carry) crc ^= CRC8RDALLAS_POLY;
}
}
return crc;
}
__task int main(void) {
uint8_t cur_trk = 0;
uint8_t cur_file = 0;

37
src/utility.c
View file

@ -44,29 +44,22 @@ uint16_t lfsr_update(void) {
return *lfsr;
}
/*
void print_line(const char* line, uint8_t off_x, uint8_t off_y) {
POKEZ(ZP_CV, off_y);
uint8_t cur_ch;
for(cur_ch = 0; line[cur_ch]; cur_ch++) {
SETNORM();
POKEZ(ZP_CH, cur_ch + off_x);
#define CRC8RDALLAS_POLY 0x31
uint8_t calculate_crc8(uint8_t* data, uint8_t len) {
uint8_t crc = 0;
for(uint8_t data_idx = 0; data_idx < len; data_idx++) {
uint8_t carry;
uint8_t d = data[data_idx];
COUT1(line[cur_ch]|0x80);
SETINV();
COUT1(' '|0x80);
for(uint8_t snd_loop = 0x70; snd_loop; snd_loop--) PEEK(IO_SPEAKER);
WAIT(0xBE);
for (uint8_t i = 8; i > 0; i--) {
carry = (crc & 0x80);
crc <<= 1;
if (d & 1) crc |= 1;
d >>= 1;
if (carry) crc ^= CRC8RDALLAS_POLY;
}
}
SETNORM();
POKEZ(ZP_CH, cur_ch + off_x);
COUT1(' '|0x80);
WAIT(0xFF);
return crc;
}
*/

2
src/utility.h
View file

@ -29,6 +29,6 @@ uint8_t bit_reverse(uint8_t b);
uint8_t bit_count(uint8_t b);
void lfsr_init(uint16_t reg);
uint16_t lfsr_update(void);
//void print_line(const char* line, uint8_t off_x, uint8_t off_y);
uint8_t calculate_crc8(uint8_t* data, uint8_t len);
#endif /* _UTILITY_HEADER_ */