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cebix |
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/* |
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* common.h - Common parts of readcbm and writecbm |
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* |
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* Written in 2003 by Christian Bauer <Christian.Bauer@uni-mainz.de> |
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*/ |
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#ifndef COMMON_H |
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#define COMMON_H |
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/* Number of tracks (tracks are numbered 1..NUM_TRACKS) */ |
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#define NUM_TRACKS 35 |
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/* Maximum number of sectors per track */ |
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#define MAX_SECTORS 21 |
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/* Bytes per sector */ |
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#define SECTOR_SIZE 256 |
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/* 1541 crystal frequency (16 MHz) */ |
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#define CRYSTAL_FREQ 16000000 |
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/* 1541 RPM */ |
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#define NOMINAL_RPM 300 |
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/* Catweasel frequency (7 MHz) */ |
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#define CW_FREQ 7080500.0 |
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/* Bit rate for each speed zone */ |
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const int bps[4] = { |
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CRYSTAL_FREQ / 16 / 4, CRYSTAL_FREQ / 15 / 4, |
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CRYSTAL_FREQ / 14 / 4, CRYSTAL_FREQ / 13 / 4 |
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}; |
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/* Standard speeds for tracks */ |
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const int std_speed[NUM_TRACKS + 1] = { |
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0, |
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3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, |
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2, 2, 2, 2, 2, 2, 2, |
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1, 1, 1, 1, 1, 1, |
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0, 0, 0, 0, 0 |
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}; |
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/* Number of sectors per track, for all tracks */ |
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const int num_sectors[NUM_TRACKS + 1] = { |
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0, |
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21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21, |
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19,19,19,19,19,19,19, |
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18,18,18,18,18,18, |
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17,17,17,17,17 |
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}; |
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/* Actual RPM of the drive, and double step flag */ |
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static int drive_rpm = 300; |
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static int double_step = 0; |
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/* Clock table (nominal number of Catweasel clocks per inter-flux-change gap) */ |
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static int clock_table[4] = {0, 0, 0, 0}; |
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/* Threshold table */ |
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static int thresh_table[3] = {0, 0, 0}; |
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/* Track buffer */ |
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static unsigned char track_buf[MAX_SECTORS * SECTOR_SIZE]; |
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/* Catweasel controller struct */ |
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catweasel_contr c; |
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/* Delay specified number of milliseconds */ |
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static void msdelay(int ms) |
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{ |
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usleep(ms * 1000); |
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} |
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/* Set speed zone and tables */ |
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static void set_zone(int track) |
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{ |
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int zone = std_speed[track]; |
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clock_table[0] = 0; |
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clock_table[1] = CW_FREQ * NOMINAL_RPM * 1 / (bps[zone] * drive_rpm); |
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clock_table[2] = CW_FREQ * NOMINAL_RPM * 2 / (bps[zone] * drive_rpm); |
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clock_table[3] = CW_FREQ * NOMINAL_RPM * 3 / (bps[zone] * drive_rpm); |
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thresh_table[0] = (clock_table[0] + clock_table[1]) / 2; |
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thresh_table[1] = (clock_table[1] + clock_table[2]) / 2; |
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thresh_table[2] = (clock_table[2] + clock_table[3]) / 2; |
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} |
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#endif |
