diff options
| author | henryk <henryk@6dc7ffe9-61d6-0310-9af1-9938baff3ed1> | 2007-12-09 06:10:56 +0000 |
|---|---|---|
| committer | henryk <henryk@6dc7ffe9-61d6-0310-9af1-9938baff3ed1> | 2007-12-09 06:10:56 +0000 |
| commit | ceb643380b02d0d8289e3ad75a495123414ace8c (patch) | |
| tree | cf37628d2b07d7cebc2a4f04d5f8ea2488eb9d57 /openpicc/application/ssc_picc.c | |
| parent | bdc39aadd1a26d7709ff15722be90c016be2057a (diff) | |
Prevent late frames by spinning in SSC CP0 IRQ till end of short frame reception
Fix tc_cdiv_set_divider. again.
Reverse the polarity! (of the ssc transmit clock)
git-svn-id: https://svn.openpcd.org:2342/trunk@381 6dc7ffe9-61d6-0310-9af1-9938baff3ed1
Diffstat (limited to 'openpicc/application/ssc_picc.c')
| -rw-r--r-- | openpicc/application/ssc_picc.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/openpicc/application/ssc_picc.c b/openpicc/application/ssc_picc.c index 98f9e46..ce507fd 100644 --- a/openpicc/application/ssc_picc.c +++ b/openpicc/application/ssc_picc.c @@ -313,7 +313,7 @@ void ssc_tx_start(ssc_dma_tx_buffer_t *buf) ssc->SSC_TFMR = ((data_len-1) & 0x1f) | (((num_data-1) & 0x0f) << 8) | (((sync_len-1) & 0x0f) << 16); - ssc->SSC_TCMR = 0x01 | AT91C_SSC_CKO_NONE | start_cond; + ssc->SSC_TCMR = 0x01 | AT91C_SSC_CKO_NONE | AT91C_SSC_CKI | start_cond; AT91F_PDC_SetTx(tx_pdc, buf->data, num_data); AT91F_PDC_SetNextTx(tx_pdc, 0, 0); @@ -381,11 +381,27 @@ static void __ramfunc ssc_irq(void) portBASE_TYPE task_woken = pdFALSE; u_int32_t ssc_sr = ssc->SSC_SR; + u_int32_t orig_ssc_sr = ssc_sr; int i, emptyframe = 0; u_int32_t *tmp; ssc_dma_rx_buffer_t *inbuf=NULL; DEBUGP("ssc_sr=0x%08x, mode=%u: ", ssc_sr, ssc_state.mode); + if (ssc_sr & AT91C_SSC_CP0 && ssc_state.mode == SSC_MODE_14443A_SHORT) { + /* Short frame, busy loop till the frame is received completely to + * prevent a second irq entrance delay when the actual frame end + * irq is raised. (The scheduler masks interrupts for about 56us, + * which is too much for anticollision.) */ + int i = 0; + vLedBlinkRed(); + while( ! ((ssc_sr=ssc->SSC_SR) & AT91C_SSC_ENDRX) ) { + i++; + if(i > 9600) break; + } + ssc_sr |= orig_ssc_sr; + vLedSetRed(1); + } + if (ssc_sr & AT91C_SSC_ENDRX) { /* Ignore empty frames */ if (ssc_state.mode == SSC_MODE_CONTINUOUS) { |