Prepare generic ISO 14443A reception mode (no short/standard distinction), prerequisite for proper frame handling and anticol, doesn't work yet

git-svn-id: https://svn.openpcd.org:2342/trunk@390 6dc7ffe9-61d6-0310-9af1-9938baff3ed1

1 files changed, 23 insertions, 18 deletions

diff --git a/openpicc/application/ssc_picc.c b/openpicc/application/ssc_picc.c
index 721989f..09be1e5 100644
--- a/openpicc/application/ssc_picc.c
+++ b/openpicc/application/ssc_picc.c
@@ -76,7 +76,9 @@ static const ssc_mode_def ssc_sizes[] = {
 	/* 14443A Short Frame: 1 transfer of ISO14443A_SHORT_LEN bits */
 	[SSC_MODE_14443A_SHORT]	   = {SSC_MODE_14443A_SHORT, ISO14443A_SHORT_TRANSFER_SIZE, 1},
 	/* 14443A Standard Frame: FIXME 16 transfers of 32 bits (maximum number), resulting in 512 samples */ 
-	[SSC_MODE_14443A_STANDARD] = {SSC_MODE_14443A_STANDARD, 32, 4},	
+	[SSC_MODE_14443A_STANDARD] = {SSC_MODE_14443A_STANDARD, 32, 16},
+	/* 14443A Frame, don't care if standard or short */
+	[SSC_MODE_14443A]          = {SSC_MODE_14443A, ISO14443A_SAMPLE_LEN, ISO14443A_MAX_RX_FRAME_SIZE_IN_BITS},
 	[SSC_MODE_14443B]	   = {SSC_MODE_14443B, 32, 16},	/* 64 bytes */
 	[SSC_MODE_EDGE_ONE_SHOT]   = {SSC_MODE_EDGE_ONE_SHOT, 32, 16},	/* 64 bytes */
 	[SSC_MODE_CONTINUOUS]	   = {SSC_MODE_CONTINUOUS, 32, 511},	/* 2044 bytes */
@@ -243,6 +245,7 @@ void ssc_rx_mode_set(enum ssc_mode ssc_mode)
 {
 	u_int8_t data_len=0, num_data=0, sync_len=0;
 	u_int32_t start_cond=0;
+	u_int8_t stop = 0;
 
 	/* disable Rx and all Rx interrupt sources */
 	AT91F_SSC_DisableRx(AT91C_BASE_SSC);
@@ -263,6 +266,14 @@ void ssc_rx_mode_set(enum ssc_mode ssc_mode)
 		data_len = 32;
 		num_data = 16;	/* FIXME */
 		break;
+	case SSC_MODE_14443A:
+		start_cond = AT91C_SSC_START_0;
+		sync_len = ISO14443A_SOF_LEN;
+		ssc->SSC_RC0R = ISO14443A_SOF_SAMPLE;
+		data_len = ISO14443A_SAMPLE_LEN;
+		num_data = 16; /* Start with 16, then switch to continuous in the IRQ handler */
+		stop = 1;      /* Actually the documentation indicates that setting STOP makes switching to continuous unnecessary */
+		break;
 	case SSC_MODE_14443B:
 		/* start sampling at first falling data edge */
 		//start_cond = 
@@ -289,7 +300,7 @@ void ssc_rx_mode_set(enum ssc_mode ssc_mode)
 			//| AT91C_SSC_MSBF
 			;
 	ssc->SSC_RCMR = AT91C_SSC_CKS_RK | AT91C_SSC_CKO_NONE | 
-			(0x2 << 6) | AT91C_SSC_CKI | start_cond;
+			(0x2 << 6) | AT91C_SSC_CKI | start_cond | (stop << 12);
 
 	/* Enable Rx DMA */
 	AT91F_PDC_EnableRx(rx_pdc);
@@ -384,16 +395,6 @@ void ssc_tf_irq(u_int32_t pio) {
 #endif
 
 
-//static struct openpcd_hdr opcd_ssc_hdr = {
-//	.cmd	= OPENPCD_CMD_SSC_READ,
-//};
-
-//static inline void init_opcdhdr(struct req_ctx *rctx)
-//{
-//	memcpy(rctx->data, &opcd_ssc_hdr, sizeof(opcd_ssc_hdr));
-//	rctx->tot_len = sizeof(opcd_ssc_hdr);
-//}
-
 static ssc_irq_ext_t irq_extension = NULL;
 ssc_irq_ext_t ssc_set_irq_extension(ssc_irq_ext_t ext_handler) {
 	ssc_irq_ext_t old = irq_extension;
@@ -419,22 +420,26 @@ static void __ramfunc ssc_irq(void)
 	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) {
+	if ((ssc_sr & AT91C_SSC_CP0) && (ssc_state.mode == SSC_MODE_14443A_SHORT || ssc_state.mode == SSC_MODE_14443A)) {
+		if(ssc_state.mode == SSC_MODE_14443A && ISO14443A_SOF_LEN != ISO14443A_EOF_LEN) {
+			/* Need to reprogram FSLEN */
+			ssc->SSC_RFMR = (ssc->SSC_RFMR & ~(0xf << 16)) | ( ((ISO14443A_EOF_LEN-1)&0xf) << 16 );
+		}
 		/* 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) ) {
+		 while( ! ((ssc_sr=ssc->SSC_SR) & (AT91C_SSC_ENDRX | AT91C_SSC_CP1)) ) {
 		 	i++;
-		 	if(i > 9600) break;
+		 	if(i > 9600) break; /* Break out, clearly this is not a short frame or a reception error happened */
 		 }
 		 ssc_sr |= orig_ssc_sr;
 		 vLedSetRed(1);
 	}
 	
-	if (ssc_sr & AT91C_SSC_ENDRX) {
+	if (ssc_sr & (AT91C_SSC_ENDRX | AT91C_SSC_CP1)) {
 		/* Ignore empty frames */
 		if (ssc_state.mode == SSC_MODE_CONTINUOUS) {
 			/* This code section is probably bitrotten by now. */
@@ -472,7 +477,7 @@ static void __ramfunc ssc_irq(void)
 		ssc_state.buffer[0] = ssc_state.buffer[1];
 		ssc_state.buffer[1] = NULL;
 		if(ssc_state.mode == SSC_MODE_EDGE_ONE_SHOT || ssc_state.mode == SSC_MODE_14443A_SHORT
-			|| ssc_state.mode == SSC_MODE_14443A_STANDARD) {
+			|| ssc_state.mode == SSC_MODE_14443A_STANDARD || (ssc_state.mode == SSC_MODE_14443A && ssc_sr & AT91C_SSC_CP1)) {
 			// Stop sampling here
 			ssc_rx_stop();
 		} else {
@@ -554,7 +559,7 @@ void ssc_rx_start(void)
 	if(ssc_state.mode != SSC_MODE_14443A_SHORT) __ssc_rx_load(1);
 	
 	/* Enable Reception */
-	AT91F_SSC_EnableIt(ssc, AT91C_SSC_ENDRX | AT91C_SSC_CP0 |
+	AT91F_SSC_EnableIt(ssc, AT91C_SSC_ENDRX | AT91C_SSC_CP0 | AT91C_SSC_CP1 |
 			   AT91C_SSC_RXBUFF | AT91C_SSC_OVRUN);
 	AT91F_PDC_EnableRx(rx_pdc);
 	AT91F_SSC_EnableRx(AT91C_BASE_SSC);