diff options
Diffstat (limited to 'openpicc/application/iso14443_layer3a.c')
| -rw-r--r-- | openpicc/application/iso14443_layer3a.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/openpicc/application/iso14443_layer3a.c b/openpicc/application/iso14443_layer3a.c new file mode 100644 index 0000000..26a6115 --- /dev/null +++ b/openpicc/application/iso14443_layer3a.c @@ -0,0 +1,143 @@ +/*************************************************************** + * + * OpenPICC - ISO 14443 Layer 3 Type A state machine + * + * Copyright 2007 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 "openpicc.h" +#include "iso14443_layer3a.h" +#include "ssc_picc.h" +#include "pll.h" +#include "tc_fdt.h" +#include "tc_cdiv.h" +#include "tc_cdiv_sync.h" +#include "usb_print.h" +#include "cmd.h" + +static enum ISO14443_STATES state = STARTING_UP; +#define PLL_LOCK_HYSTERESIS portTICK_RATE_MS*5 + +#define LAYER3_DEBUG usb_print_string + +void iso14443_layer3a_state_machine (void *pvParameters) +{ + unsigned long int last_pll_lock = ~0; + (void)pvParameters; + while(1) { + ssc_dma_buffer_t* buffer = NULL; + portBASE_TYPE need_receive = 0, switch_on = 0; + + /* First let's see whether there is a reader */ + switch(state) { + case STARTING_UP: /* Fall through */ + case ERROR: + // do nothing here + break; + case POWERED_OFF: + if(pll_is_locked()) { + unsigned long int now = xTaskGetTickCount(); + if(now - last_pll_lock > PLL_LOCK_HYSTERESIS) { + /* Go to idle when in POWERED_OFF and pll + * was locked for at least + * PLL_LOCK_HYSTERESIS ticks */ + switch_on = 1; + last_pll_lock = ~0; + LAYER3_DEBUG("PLL locked, switching on \n\r"); + } else last_pll_lock = now; + } else last_pll_lock = ~0; + break; + default: + if(!pll_is_locked()) { + unsigned long int now = xTaskGetTickCount(); + if(now - last_pll_lock > PLL_LOCK_HYSTERESIS) { + /* Power off when not powered off and pll + * was unlocked for at least PLL_LOCK_HYSTERESIS + * ticks */ + state = POWERED_OFF; + ssc_rx_stop(); + last_pll_lock = ~0; + LAYER3_DEBUG("PLL lost lock, switching off \n\r"); + continue; + } else last_pll_lock = now; + } else last_pll_lock = ~0; + break; + } + + switch(state) { + case STARTING_UP: + pll_init(); + + tc_cdiv_init(); + tc_cdiv_set_divider(32); + tc_fdt_init(); +#if 0 + ssc_tx_init(); +#else + AT91F_PIO_CfgInput(AT91C_BASE_PIOA, OPENPICC_MOD_PWM); + AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, OPENPICC_MOD_SSC | + OPENPICC_SSC_DATA | OPENPICC_SSC_DATA | + AT91C_PIO_PA15, 0); +#endif + ssc_rx_init(); + + state = POWERED_OFF; + break; + case POWERED_OFF: + if(switch_on == 1) { + state=IDLE; + continue; + } + break; + case IDLE: + case HALT: + /* Wait for REQA or WUPA (HALT: only WUPA) */ + ssc_rx_mode_set(SSC_MODE_14443A_SHORT); + ssc_rx_start(); + need_receive = 1; + default: + break; + } + + if(need_receive) { + if(xQueueReceive(ssc_rx_queue, &buffer, portTICK_RATE_MS)) { + portENTER_CRITICAL(); + buffer->state = PROCESSING; + portEXIT_CRITICAL(); + + switch(state) { + case IDLE: + case HALT: + + break; + default: + break; + } + + portENTER_CRITICAL(); + buffer->state = FREE; + portEXIT_CRITICAL(); + } + } else vTaskDelay(portTICK_RATE_MS); + } +} |