Revision 276
Optimizations to the card reader
| trunk/cardbox/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 |
} |
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