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reduce window included in wait_1 before response to avoid phantom symbols

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This commit is contained in:
Philippe Teuwen 2020-01-15 23:22:42 +01:00
commit aa0879eee4
1 changed files with 4 additions and 3 deletions
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7
armsrc/hitag2.c
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@ -1211,6 +1211,7 @@ void ReaderHitag(hitag_function htf, hitag_data *htd) {
uint8_t *tx = txbuf; uint8_t *tx = txbuf;
size_t txlen = 0; size_t txlen = 0;
int t_wait_1; int t_wait_1;
int t_wait_1_guard = 8;
int t_wait_2; int t_wait_2;
size_t tag_size; size_t tag_size;
bool bStop = false; bool bStop = false;
@ -1412,7 +1413,7 @@ void ReaderHitag(hitag_function htf, hitag_data *htd) {
// Let the antenna and ADC values settle // Let the antenna and ADC values settle
// And find the position where edge sampling should start // And find the position where edge sampling should start
lf_wait_periods(t_wait_1 - 64); lf_wait_periods(t_wait_1 - t_wait_1_guard);
// Reset the response time (in number of periods) // Reset the response time (in number of periods)
response = 0; response = 0;
@ -1443,10 +1444,10 @@ void ReaderHitag(hitag_function htf, hitag_data *htd) {
nrz_samples[nrzs++] = tag_modulation ^ 1; nrz_samples[nrzs++] = tag_modulation ^ 1;
// Register the number of periods that have passed // Register the number of periods that have passed
// we missed the begin of response but we know it happened one period of 16 earlier // we missed the begin of response but we know it happened one period of 16 earlier
response = t_wait_1 - 64 + periods - 16; response = t_wait_1 - t_wait_1_guard + periods - 16;
} else { } else {
// Register the number of periods that have passed // Register the number of periods that have passed
response = t_wait_1 - 64 + periods; response = t_wait_1 - t_wait_1_guard + periods;
} }
// Indicate that we have dealt with the first edge // Indicate that we have dealt with the first edge
waiting_for_first_edge = false; waiting_for_first_edge = false;