diff options
Diffstat (limited to 'openpicc/application')
| -rw-r--r-- | openpicc/application/iso14443_layer2a.c | 172 | ||||
| -rw-r--r-- | openpicc/application/iso14443_layer2a.h | 77 | ||||
| -rw-r--r-- | openpicc/application/iso14443_layer3a.c | 2 | ||||
| -rw-r--r-- | openpicc/application/iso14443_sniffer.c | 109 | ||||
| -rw-r--r-- | openpicc/application/iso14443_sniffer.h | 6 | ||||
| -rw-r--r-- | openpicc/application/main.c | 5 | ||||
| -rw-r--r-- | openpicc/application/ssc_picc.c | 62 |
7 files changed, 387 insertions, 46 deletions
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); |