diff options
| author | henryk <henryk@6dc7ffe9-61d6-0310-9af1-9938baff3ed1> | 2007-12-03 04:55:57 +0000 |
|---|---|---|
| committer | henryk <henryk@6dc7ffe9-61d6-0310-9af1-9938baff3ed1> | 2007-12-03 04:55:57 +0000 |
| commit | e22f23efcbe54ab8aabfd54f8b55a5d01a15a487 (patch) | |
| tree | 015aa7b5dcf063d4fc594eb4fade40cd086ae924 /openpicc/application/iso14443_layer3a.h | |
| parent | 67d9be99569c49671b4cc2217824307202b92439 (diff) | |
* Reduce leaking of TX buffers
* Found the problem that when switching between receiving and sending tc_cdiv would most of the time not generate an SSC_CLOCK for approx. 5ms: The issue is that after setting the divisor (which
stored in RC) CV might be greater than RC. Thus no compare will happen until CV overflows (at 0xffff carrier cycles) and therefore the clock will appear to be stopped for that time. A good fix would
have been TC_CV = TC_CV % TC_RC but unfortunately TC_CV is read-only. Instead use SWTRG to reset TC_CV to zero and then try to use the phase-shift code to have the phase stay correct.
* Measured the transmit start delay that is introduced by the SSC TF emulation through FIQ and adjusted ISO14443A_FDT accordingly
git-svn-id: https://svn.openpcd.org:2342/trunk@366 6dc7ffe9-61d6-0310-9af1-9938baff3ed1
Diffstat (limited to 'openpicc/application/iso14443_layer3a.h')
| -rw-r--r-- | openpicc/application/iso14443_layer3a.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/openpicc/application/iso14443_layer3a.h b/openpicc/application/iso14443_layer3a.h index 142128e..d398d1f 100644 --- a/openpicc/application/iso14443_layer3a.h +++ b/openpicc/application/iso14443_layer3a.h @@ -16,9 +16,11 @@ enum ISO14443_STATES { }; /******************** RX ************************************/ +/* measured TF->FIQ->SSC TX start delay (~3.480us) in carrier cycles */ +#define TF_FIQ_SSC_DELAY 47 /* standard derived magic values */ -#define ISO14443A_FDT_SHORT_1 1236 -#define ISO14443A_FDT_SHORT_0 1172 +#define ISO14443A_FDT_SHORT_1 (1236-TF_FIQ_SSC_DELAY) +#define ISO14443A_FDT_SHORT_0 (1172-TF_FIQ_SSC_DELAY) #ifdef FOUR_TIMES_OVERSAMPLING /* definitions for four-times oversampling */ |