Revision 276
Optimizations to the card reader
cardreader.c | ||
---|---|---|
62 | 62 |
|
63 | 63 |
// Look for the start sentinal |
64 | 64 |
while (start_sentinal == 0) { |
65 |
byte = (((byte >> 1) & 0x1F) | (cr_buf[i])); |
|
65 |
byte = (((byte >> 1) & 0x1F) | (cr_buf[i] << 5));
|
|
66 | 66 |
|
67 | 67 |
if (cr_dict[byte] == CR_SS) { |
68 | 68 |
start_sentinal = 1; |
... | ... | |
109 | 109 |
|
110 | 110 |
// Data bits |
111 | 111 |
} else { |
112 |
byte = (((byte >> 1) & 0x1F) | (cr_buf[i])); |
|
112 |
byte = (((byte >> 1) & 0x1F) | (cr_buf[i] << 5));
|
|
113 | 113 |
byte_idx++; |
114 |
parity += (cr_buf[i]) ? 0 : 1;
|
|
114 |
parity += cr_buf[i];
|
|
115 | 115 |
} |
116 | 116 |
|
117 | 117 |
// Goto next bit in cr_buf |
... | ... | |
144 | 144 |
// Read data in on the downtick of the clock |
145 | 145 |
if (!(PIND & CR_CLK)) { |
146 | 146 |
// Read data from card reader and flip since ours inverts |
147 |
cr_buf[cr_buf_idx] = (PIND & CR_DATA) ? 0 : 0x20;
|
|
147 |
cr_buf[cr_buf_idx] = !(PIND & CR_DATA);
|
|
148 | 148 |
cr_buf_idx++; |
149 | 149 |
} |
150 | 150 |
} |
Also available in: Unified diff