From 6be69f0de0c5455758c7ab3a6a3c7d37a061e5fa Mon Sep 17 00:00:00 2001
From: henryk <henryk@6dc7ffe9-61d6-0310-9af1-9938baff3ed1>
Date: Sat, 9 Feb 2008 17:49:39 +0000
Subject: Commit a first version of an iso 14443 layer 2 and a passive sniffer.
Works for short frames, and sometimes even for long frames. Pending some
major cleanup
git-svn-id: https://svn.openpcd.org:2342/trunk@408 6dc7ffe9-61d6-0310-9af1-9938baff3ed1
---
openpicc/application/iso14443_layer2a.c | 172 ++++++++++++++++++++++++++++++++
openpicc/application/iso14443_layer2a.h | 77 ++++++++++++++
openpicc/application/iso14443_layer3a.c | 2 +-
openpicc/application/iso14443_sniffer.c | 109 ++++++++++++++++++++
openpicc/application/iso14443_sniffer.h | 6 ++
openpicc/application/main.c | 5 +-
openpicc/application/ssc_picc.c | 62 ++++--------
7 files changed, 387 insertions(+), 46 deletions(-)
create mode 100644 openpicc/application/iso14443_layer2a.c
create mode 100644 openpicc/application/iso14443_layer2a.h
create mode 100644 openpicc/application/iso14443_sniffer.c
create mode 100644 openpicc/application/iso14443_sniffer.h
(limited to 'openpicc/application')
diff --git a/openpicc/application/iso14443_layer2a.c b/openpicc/application/iso14443_layer2a.c
new file mode 100644
index 0000000..b91b67c
--- /dev/null
+++ b/openpicc/application/iso14443_layer2a.c
@@ -0,0 +1,172 @@
+/***************************************************************
+ *
+ * OpenPICC - ISO 14443 Layer 2 Type A PICC transceiver code
+ * Manages receiving, sending and parts of framing
+ *
+ * This does not fully implement layer 2 in that it won't
+ * automatically call the Miller decoder or Manchester encoder
+ * for you. Instead you'll be given ssc rx buffer pointers and
+ * are expected to hand in ssc tx buffer pointers. You've got
+ * to call iso14443a_manchester and iso14443a_miller yourself.
+ * The reason is that this makes it possible for the layer 3
+ * implementation to work on raw samples without en/de-coding
+ * time to enable fast responses during anticollision.
+ *
+ * Copyright 2008 Henryk Plötz <henryk@ploetzli.ch>
+ *
+ ***************************************************************
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+*/
+
+#include <FreeRTOS.h>
+#include <board.h>
+#include <task.h>
+#include <errno.h>
+
+#include "openpicc.h"
+#include "iso14443_layer2a.h"
+#include "ssc_picc.h"
+#include "pll.h"
+#include "tc_fdt.h"
+#include "tc_cdiv.h"
+#include "tc_cdiv_sync.h"
+#include "load_modulation.h"
+
+static u_int8_t fast_receive;
+static volatile u_int8_t receiving = 0;
+
+#ifdef FOUR_TIMES_OVERSAMPLING
+#define RX_DIVIDER 32
+#else
+#define RX_DIVIDER 64
+#endif
+
+int iso14443_receive(iso14443_receive_callback_t callback, ssc_dma_rx_buffer_t **buffer, unsigned int timeout)
+{
+ int was_receiving = receiving;
+ (void)callback;
+ ssc_dma_rx_buffer_t* _buffer = NULL;
+ int len;
+
+
+ if(!was_receiving) {
+ iso14443_l2a_rx_start();
+ } else {
+ /*
+ * handled by _iso14443_ssc_irq_ext below
+ tc_fdt_set(0xff00);
+ tc_cdiv_set_divider(RX_DIVIDER);
+ tc_cdiv_sync_reset();
+ */
+ }
+
+
+ if(xQueueReceive(ssc_rx_queue, &_buffer, timeout)) {
+ if(!was_receiving) {
+ iso14443_l2a_rx_stop();
+ }
+
+ if(_buffer == NULL) {
+ /* Can this happen? */
+ return -ETIMEDOUT;
+ }
+
+ portENTER_CRITICAL();
+ _buffer->state = PROCESSING;
+ portEXIT_CRITICAL();
+
+ len = _buffer->len_transfers;
+
+ if(buffer != NULL) *buffer = _buffer;
+ else {
+ portENTER_CRITICAL();
+ _buffer->state = FREE;
+ portEXIT_CRITICAL();
+ }
+
+ return len;
+ }
+
+ if(!was_receiving)
+ iso14443_l2a_rx_stop();
+
+ return -ETIMEDOUT;
+}
+
+int iso14443_wait_for_carrier(unsigned int timeout)
+{
+ (void)timeout;
+ return 0;
+}
+
+int iso14443_l2a_rx_start(void)
+{
+ receiving = 1;
+ tc_fdt_set(0xff00);
+ tc_cdiv_set_divider(RX_DIVIDER);
+ ssc_rx_start();
+ return 0;
+}
+
+int iso14443_l2a_rx_stop(void)
+{
+ ssc_rx_stop();
+ receiving = 0;
+ return 0;
+}
+
+
+u_int8_t iso14443_set_fast_receive(u_int8_t enable_fast_receive)
+{
+ u_int8_t old_value = fast_receive;
+ fast_receive = enable_fast_receive;
+ return old_value;
+}
+
+u_int8_t iso14443_get_fast_receive(void)
+{
+ return fast_receive;
+}
+
+void _iso14443_ssc_irq_ext(u_int32_t ssc_sr, enum ssc_mode ssc_mode, u_int8_t* samples)
+{
+ (void) ssc_mode; (void) samples;
+ if( (ssc_sr & AT91C_SSC_CP1) && receiving) {
+ tc_fdt_set(0xff00);
+ tc_cdiv_set_divider(RX_DIVIDER);
+ tc_cdiv_sync_reset();
+ }
+}
+
+int iso14443_layer2a_init(u_int8_t enable_fast_receive)
+{
+ pll_init();
+
+ tc_cdiv_init();
+ tc_fdt_init();
+ //ssc_set_irq_extension((ssc_irq_ext_t)iso14443_layer3a_irq_ext);
+ ssc_rx_init();
+ ssc_tx_init();
+
+ load_mod_init();
+ load_mod_level(3);
+
+ ssc_rx_mode_set(SSC_MODE_14443A);
+ ssc_set_irq_extension(_iso14443_ssc_irq_ext);
+
+ iso14443_set_fast_receive(enable_fast_receive);
+ return 0;
+}
diff --git a/openpicc/application/iso14443_layer2a.h b/openpicc/application/iso14443_layer2a.h
new file mode 100644
index 0000000..abe019a
--- /dev/null
+++ b/openpicc/application/iso14443_layer2a.h
@@ -0,0 +1,77 @@
+#ifndef ISO14443_LAYER2A_H_
+#define ISO14443_LAYER2A_H_
+
+#include "ssc_picc.h"
+
+/* Callback type for iso14443_receive().
+ * Parameter buffer is being passed a pointer to an SSC Rx buffer structure that this receive happened
+ * on. You might want to pass this into iso14443a_decode_miller().
+ * Parameter in_irq is true if the callback has been called while still in IRQ mode. It must then *NOT*
+ * perform any calls that might upset the IRQ processing. Especially it may not call into FreeRTOS or
+ * any parts of the applications that do.
+ */
+typedef void (*iso14443_receive_callback_t)(ssc_dma_rx_buffer_t *buffer, u_int8_t in_irq);
+
+/* Wait for and receive a frame. Parameters callback and buffer are optional. If you omit them you'll lose
+ * the received frame, obviously.
+ * Parameter callback is a callback function that will be called for each received frame and might
+ * then trigger a response.
+ * Parameter buffer is an output pointer to a pointer to an SSC Rx buffer structure containing the
+ * received frame.
+ * Parameter timeout gives an optional timeout for the receive operation after which the receive will
+ * be aborted. When timeout is 0 the receive will not time out.
+ * This call will block until a frame is received or an exception happens. Obviously it must not be run
+ * from IRQ context.
+ *
+ * Warning: When you get a buffer from the function then it's state is set to PROCESSING and you must
+ * FREE it yourself.
+ *
+ * Return values:
+ * >= 0 Frame received, return value is buffer length (yes, 0 is a valid buffer length)
+ * -ENETDOWN PLL is not locked or PLL lock lost
+ * -ETIMEDOUT Receive timed out without receiving anything (usually not regarded an error condition)
+ * -EBUSY A Tx is currently running or pending; can't receive
+ * -EALREADY There's already an iso14443_receive() invocation running
+ */
+extern int iso14443_receive(iso14443_receive_callback_t callback, ssc_dma_rx_buffer_t **buffer, unsigned int timeout);
+
+/*
+ * Transmit a frame. Starts transmitting fdt carrier cycles after the end of the received frame.
+ * Parameters buffer and fdt specify the SSC Tx buffer to be sent and the frame delay time in carrier cycles.
+ * When parameter async is set then this call will only schedule the buffer for sending and return immediately,
+ * otherwise the call will block until the buffer has been sent completely, until the specified timeout is reached
+ * or an error occurs.
+ * This function may be run from IRQ context, especially from within the iso14443_receive callback, with the async
+ * parameter set.
+ *
+ * Note: When your callback calls iso14443_transmit() from IRQ context it must set the async parameter to have transmit
+ * return immediately and then not block within the callback. When the scheduled transmission has not happened by the next
+ * time you call iso14443_receive() it will abort with -EBUSY and you can then either decide to wait for the transmission
+ * to go through, or abort the scheduled transmission with iso14443_tx_abort(). You can check for whether a Tx is currently
+ * pending or running with iso14443_tx_busy().
+ */
+extern int iso14443_transmit(ssc_dma_tx_buffer_t *buffer, unsigned int fdt, u_int8_t async, unsigned int timeout);
+
+extern int iso14443_tx_abort(void);
+extern int iso14443_tx_busy(void);
+
+extern int iso14443_l2a_rx_start(void);
+extern int iso14443_l2a_rx_stop(void);
+
+/*
+ * Wait for the presence of a reader to be detected.
+ * Returns 0 when the PLL is locked.
+ */
+extern int iso14443_wait_for_carrier(unsigned int timeout);
+
+/* Initialize the layer 2 transceiver code.
+ * Parameter enable_fast_receive, when set, will enable special code to guarantee fast response times
+ * for frames shorter than or equal to 56 data bits (bit oriented anticollision frame length). This
+ * generally involves running the callback from an IRQ handler.
+ */
+extern int iso14443_layer2a_init(u_int8_t enable_fast_receive);
+
+extern u_int8_t iso14443_set_fast_receive(u_int8_t enable_fast_receive);
+extern u_int8_t iso14443_get_fast_receive(void);
+
+#endif /*ISO14443_LAYER2A_H_*/
diff --git a/openpicc/application/iso14443_layer3a.c b/openpicc/application/iso14443_layer3a.c
index fdb6836..daac8dd 100644
--- a/openpicc/application/iso14443_layer3a.c
+++ b/openpicc/application/iso14443_layer3a.c
@@ -78,7 +78,7 @@ const u_int8_t ISO14443A_SHORT_FRAME_WUPA[ISO14443A_SHORT_FRAME_COMPARE_LENGTH]
#define INITIAL_FRAME NULL_FRAME
#endif
-#if 0
+#if 1
#define SHORT_MODE SSC_MODE_14443A_SHORT
#define STANDARD_MODE SSC_MODE_14443A_STANDARD
#else
diff --git a/openpicc/application/iso14443_sniffer.c b/openpicc/application/iso14443_sniffer.c
new file mode 100644
index 0000000..d5cf9c2
--- /dev/null
+++ b/openpicc/application/iso14443_sniffer.c
@@ -0,0 +1,109 @@
+/***************************************************************
+ *
+ * OpenPICC - ISO 14443 Layer 2 Type A Sniffer
+ * Also serves as PoC code for iso14443_layer2a usage
+ *
+ * Copyright 2008 Henryk Plötz <henryk@ploetzli.ch>
+ *
+ ***************************************************************
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+*/
+
+#include <FreeRTOS.h>
+#include <board.h>
+#include <task.h>
+#include <errno.h>
+
+#include "openpicc.h"
+#include "iso14443_sniffer.h"
+#include "iso14443_layer2a.h"
+#include "iso14443a_miller.h"
+#include "usb_print.h"
+#include "cmd.h"
+
+static iso14443_frame rx_frame;
+
+void iso14443_sniffer (void *pvParameters)
+{
+ (void)pvParameters;
+ int res;
+
+ /* Delay until USB print etc. are ready */
+ vTaskDelay(1000 * portTICK_RATE_MS);
+
+ do {
+ res = iso14443_layer2a_init(0);
+ if(res < 0) {
+ usb_print_string("Sniffer: Initialization failed\n\r");
+ vTaskDelay(10000 * portTICK_RATE_MS);
+ }
+ } while(res < 0);
+
+ usb_print_string("Waiting for carrier. ");
+ while(iso14443_wait_for_carrier(1000 * portTICK_RATE_MS) != 0) {
+ }
+ usb_print_string("Carrier detected.\n\r");
+
+ iso14443_l2a_rx_start();
+ while(true) {
+ ssc_dma_rx_buffer_t *buffer = 0;
+ res = iso14443_receive(NULL, &buffer, 20000 * portTICK_RATE_MS);
+ if(res >= 0) {
+ DumpStringToUSB("\n\r");
+ DumpTimeToUSB(xTaskGetTickCount());
+ usb_print_string(": Frame received, consists of ");
+ DumpUIntToUSB(res);
+ usb_print_string(" transfers (");
+ DumpUIntToUSB(buffer->reception_mode->transfersize_ssc);
+ usb_print_string(" bits from SSC each)\n\r ");
+ if(buffer->len_transfers < 200)
+ DumpBufferToUSB((char*)buffer->data, (buffer->len_transfers * buffer->reception_mode->transfersize_pdc)/8);
+ else {
+ DumpBufferToUSB((char*)buffer->data, (200 * buffer->reception_mode->transfersize_pdc)/8);
+ usb_print_string("...");
+ }
+ usb_print_string("\n\r ");
+
+ iso14443a_decode_miller(&rx_frame, buffer);
+
+ usb_print_string("Decodes to ");
+ DumpUIntToUSB(rx_frame.numbytes);
+ usb_print_string(" bytes and ");
+ DumpUIntToUSB(rx_frame.numbits);
+ usb_print_string(" bits: ");
+ DumpBufferToUSB((char*)rx_frame.data, rx_frame.numbytes + (rx_frame.numbits+7)/8 );
+ usb_print_string("\n\r");
+
+ portENTER_CRITICAL();
+ buffer->state = FREE;
+ portEXIT_CRITICAL();
+ } else {
+ if(res != -ETIMEDOUT) {
+ usb_print_string("Receive error: ");
+ switch(res) {
+ case -ENETDOWN: usb_print_string("PLL is not locked or PLL lock lost\n\r"); break;
+ case -EBUSY: usb_print_string("A Tx is currently running or pending, can't receive\n\r"); break;
+ case -EALREADY: usb_print_string("There's already an iso14443_receive() invocation running\n\r"); break;
+ }
+ vTaskDelay(1000 * portTICK_RATE_MS); // FIXME Proper error handling, e.g. wait for Tx end in case of EBUSY
+ } else if(0) {
+ DumpStringToUSB("\n\r");
+ DumpTimeToUSB(xTaskGetTickCount());
+ usb_print_string(": -- Mark --");
+ }
+ }
+ }
+}
diff --git a/openpicc/application/iso14443_sniffer.h b/openpicc/application/iso14443_sniffer.h
new file mode 100644
index 0000000..59a406a
--- /dev/null
+++ b/openpicc/application/iso14443_sniffer.h
@@ -0,0 +1,6 @@
+#ifndef ISO14443_SNIFFER_H_
+#define ISO14443_SNIFFER_H_
+
+extern void iso14443_sniffer (void *pvParameters);
+
+#endif /*ISO14443_SNIFFER_H_*/
diff --git a/openpicc/application/main.c b/openpicc/application/main.c
index 38a08b5..1125153 100644
--- a/openpicc/application/main.c
+++ b/openpicc/application/main.c
@@ -48,6 +48,7 @@
#include "tc_fdt.h"
#include "usb_print.h"
#include "iso14443_layer3a.h"
+#include "iso14443_sniffer.h"
#include "decoder.h"
/**********************************************************************/
@@ -173,7 +174,9 @@ int main (void)
/*xTaskCreate (vMainTestSSCRXConsumer, (signed portCHAR *) "SSC_CONSUMER", TASK_USB_STACK,
NULL, TASK_USB_PRIORITY, NULL);*/
- xTaskCreate (iso14443_layer3a_state_machine, (signed portCHAR *) "ISO14443A-3", TASK_ISO_STACK,
+ /*xTaskCreate (iso14443_layer3a_state_machine, (signed portCHAR *) "ISO14443A-3", TASK_ISO_STACK,
+ NULL, TASK_ISO_PRIORITY, NULL);*/
+ xTaskCreate (iso14443_sniffer, (signed portCHAR *) "ISO14443-SNIFF", TASK_ISO_STACK,
NULL, TASK_ISO_PRIORITY, NULL);
xTaskCreate (vUSBCDCTask, (signed portCHAR *) "USB", TASK_USB_STACK,
diff --git a/openpicc/application/ssc_picc.c b/openpicc/application/ssc_picc.c
index dd3cb02..1eabeb2 100644
--- a/openpicc/application/ssc_picc.c
+++ b/openpicc/application/ssc_picc.c
@@ -167,6 +167,7 @@ static int __ramfunc __ssc_rx_load(int secondary)
* of some sort. However, instead of leaking buffers we'll just pretend it to
* be free again. */
ssc_buffer_errors++;
+ usb_print_buffer_f("^", 0, 1, 0);
if(ssc_state.buffer[secondary]->state == PENDING) {
ssc_state.buffer[secondary]->state = FREE;
}
@@ -260,6 +261,7 @@ static ssc_dma_rx_buffer_t* __ramfunc __ssc_rx_unload(int secondary)
DumpUIntToUSB(elapsed_size); DumpStringToUSB(" "); DumpUIntToUSB((int)buffer->data); DumpStringToUSB(" ");
usb_print_set_default_flush(i);
ssc_buffer_errors++;
+ usb_print_buffer_f("°", 0, 1, 0);
if(buffer->state == PENDING) buffer->state = FREE;
ssc_state.buffer[secondary] = NULL;
return NULL;
@@ -370,7 +372,7 @@ void ssc_rx_mode_set(enum ssc_mode ssc_mode)
//| AT91C_SSC_MSBF
;
ssc->SSC_RCMR = AT91C_SSC_CKS_RK | AT91C_SSC_CKO_NONE |
- clock_gating | AT91C_SSC_CKI | start_cond | (stop << 12);
+ clock_gating | (0&AT91C_SSC_CKI) | start_cond | (stop << 12);
/* Enable Rx DMA */
AT91F_PDC_EnableRx(rx_pdc);
@@ -488,8 +490,6 @@ static void __ramfunc ssc_irq(void)
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);
@@ -499,7 +499,7 @@ static void __ramfunc ssc_irq(void)
* irq is raised. (The scheduler masks interrupts for about 56us,
* which is too much for anticollision.) */
int i = 0;
- vLedBlinkRed();
+ //vLedBlinkRed();
while( ! ((ssc_sr=ssc->SSC_SR) & (AT91C_SSC_ENDRX | AT91C_SSC_CP1)) ) {
i++;
if(i > 9600) break; /* Break out, clearly this is not a short frame or a reception error happened */
@@ -508,55 +508,29 @@ static void __ramfunc ssc_irq(void)
vLedSetRed(1);
}
+ if(orig_ssc_sr & AT91C_SSC_CP1) {usb_print_string_f("oCP1 ", 0); vLedBlinkRed();}
if(ssc_sr & AT91C_SSC_CP1) usb_print_string_f("CP1 ", 0);
if (ssc_sr & (AT91C_SSC_ENDRX | AT91C_SSC_CP1)) {
-#if 0
-// Bitrotten
- /* Ignore empty frames */
- if (ssc_state.mode == SSC_MODE_CONTINUOUS) {
- /* This code section is probably bitrotten by now. */
- tmp = (u_int32_t*)ssc_state.buffer[0]->data;
- emptyframe = 1;
- for(i = (ssc_state.buffer[0]->len) / 4 - 8/*WTF?*/; i > 0; i--) {
- if( *tmp++ != 0x0 ) {
- DEBUGPCR("NONEMPTY(%08x, %i): %08x", tmp, i, *(tmp-1));
- emptyframe = 0;
- break;
- } else {
- //DEBUGPCR("DUNNO(%08x, %i): %08x", tmp, i, tmp[i]);
- }
- }
- }
-#else
- (void)i;
- (void)tmp;
-#endif
- //DEBUGP("Sending primary RCTX(%u, len=%u) ", req_ctx_num(ssc_state.rx_ctx[0]), ssc_state.rx_ctx[0]->tot_len);
- /* Mark primary RCTX as ready to send for usb */
- if(!emptyframe) {
- //unsigned int i;
- DEBUGP("NONEMPTY");
- //gaportENTER_CRITICAL();
- ssc_state.buffer[0]->state = FULL;
- //gaportEXIT_CRITICAL();
- task_woken = xQueueSendFromISR(ssc_rx_queue, &ssc_state.buffer[0], task_woken);
- } else {
- DEBUGP("EMPTY");
- //gaportENTER_CRITICAL();
- ssc_state.buffer[0]->state = FREE;
- //gaportEXIT_CRITICAL();
+ inbuf = ssc_state.buffer[0];
+ if(ssc_sr & AT91C_SSC_CP1 && !(ssc_sr & AT91C_SSC_ENDRX)) {
+ /* Manually unload buffer 0, since only the SSC has stopped, not the PDC */
+ __ssc_rx_unload(0);
+ __ssc_rx_load(0);
}
+
+ inbuf->state = FULL;
+ task_woken = xQueueSendFromISR(ssc_rx_queue, &inbuf, task_woken);
vLedSetGreen(1);
-
- inbuf = ssc_state.buffer[0];
+
if(ssc_sr & AT91C_SSC_ENDRX) {
- /* second buffer gets propagated to primary */
+ /* second buffer got propagated to primary */
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 && ssc_sr & AT91C_SSC_CP1)) {
+ || ssc_state.mode == SSC_MODE_14443A_STANDARD) {
// Stop sampling here
ssc_rx_stop();
} else {
@@ -576,7 +550,7 @@ static void __ramfunc ssc_irq(void)
AT91C_SSC_OVRUN);
}
- if(ssc_sr & AT91C_SSC_RXENA) if (__ssc_rx_load(1) == -1)
+ if(ssc_sr & AT91C_SSC_RXENA && ssc_state.buffer[1] == NULL) if (__ssc_rx_load(1) == -1)
AT91F_SSC_DisableIt(ssc, AT91C_SSC_ENDRX |
AT91C_SSC_RXBUFF |
AT91C_SSC_OVRUN);
--
cgit v1.2.3