Timer counter functions, Makefile adjusted

sam3s_example/Makefile

@@ -142,9 +142,9 @@ VPATH += src_board src_sam3s cmsis $(USB_PATHS) simtrace
 # Objects built from C source files
 C_CMSIS    = core_cm3.o
 C_LOWLEVEL = board_cstartup_gnu.o board_lowlevel.o syscalls.o exceptions.o
-C_LIBLEVEL = spi.o pio.o pmc.o usart.o pio_it.o pio_capture.o uart_console.o iso7816_4.o wdt.o led.o 
+C_LIBLEVEL = spi.o pio.o pmc.o usart.o pio_it.o pio_capture.o uart_console.o iso7816_4.o wdt.o led.o tc.o
 C_CCID = cciddriver.o USBD.o USBDDriver.o USBD_HAL.o USBRequests.o USBDCallbacks.o USBDescriptors.o USBDDriverCallbacks.o
-C_SIMTRACE = simtrace_iso7816.o usb.o ccid.o sniffer.o phone.o
+C_SIMTRACE = simtrace_iso7816.o usb.o ccid.o sniffer.o phone.o tc_etu.o
 C_APPLEVEL = main.o
 C_OBJECTS  = $(C_CMSIS) $(C_LOWLEVEL) $(C_LIBLEVEL) $(C_APPLEVEL) $(C_CCID) $(C_SIMTRACE)
 

sam3s_example/simtrace/simtrace.h

@@ -59,4 +59,8 @@ extern void CCID_run( void );
 extern void Phone_run( void );
 extern void MITM_run( void );
 
+/*  Timer helper function */
+void Timer_Init( void );
+void TC0_Counter_Reset( void );
+
 #endif  /*  SIMTRACE_H  */

sam3s_example/simtrace/tc_etu.c

@@ -0,0 +1,115 @@
+/* SimTrace TC (Timer / Clock) support code
+ * (C) 2006 by Harald Welte <hwelte@hmw-consulting.de>
+ *
+ *  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; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+/*------------------------------------------------------------------------------
+ *          Headers
+ *------------------------------------------------------------------------------*/
+#include "board.h"
+
+#include <string.h>
+
+//FIXME:
+static const Pin pTC[] = {PIO_PA4B_TCLK0, PIO_PA0B_TIOA0, PIO_PA1B_TIOB0};
+
+/** Global timestamp in milliseconds since start of application */
+volatile uint32_t dwTimeStamp = 0;
+uint8_t timeout_occured = 0;
+
+// FIXME: Do I need the function?:
+/**
+ *  \brief Handler for Sytem Tick interrupt.
+ *
+ *  Process System Tick Event
+ *  Increments the timestamp counter.
+ */
+void SysTick_Handler( void )
+{
+    dwTimeStamp ++;
+    
+}
+
+
+
+void TC0_IrqHandler( void )
+{
+    volatile uint32_t dummy;
+    /* Clear status bit to acknowledge interrupt */
+    dummy = TC0->TC_CHANNEL[ 0 ].TC_SR;
+
+    TRACE_DEBUG("++++ TC0_IrqHandler");
+    timeout_occured++;
+}
+
+
+void TC0_Counter_Reset( void )
+{
+    TC0->TC_CHANNEL[ 0 ].TC_CCR = TC_CCR_SWTRG ;
+}
+
+/*  == Timeouts ==
+ *  One symbol is about 2ms --> Timeout = BUFLEN * 2ms ?
+ *  For BUFLEN = 64 that is 7.8 Hz
+ */
+void Timer_Init() 
+{
+    uint32_t div;
+    uint32_t tcclks;
+
+    /** Enable peripheral clock. */
+    PMC_EnablePeripheral(ID_TC0);
+
+    /** Configure TC for a 8Hz frequency and trigger on RC compare. */
+    TC_FindMckDivisor( 1, BOARD_MCK, &div, &tcclks, BOARD_MCK );
+    TRACE_INFO("Chosen div, tcclk: %d, %d", div, tcclks);
+    /* TC_CMR: TC Channel Mode Register: Capture Mode */
+    /* CPCTRG: RC Compare resets the counter and starts the counter clock. */
+    TC_Configure( TC0, 0, tcclks | TC_CMR_CPCTRG );
+    /* TC_RC: TC Register C: contains the Register C value in real time. */
+    TC0->TC_CHANNEL[ 0 ].TC_RC = ( BOARD_MCK / div ) / 4; 
+
+    /* Configure and enable interrupt on RC compare */
+    NVIC_EnableIRQ( (IRQn_Type)ID_TC0 );
+
+    TC0->TC_CHANNEL[ 0 ].TC_IER = TC_IER_CPCS;  /* CPCS: RC Compare */
+    TC_Start( TC0, 0 );
+
+    return;
+
+    /*** From here on we have code based on old simtrace code */
+
+    /* Cfg PA4(TCLK0), PA0(TIOA0), PA1(TIOB0) */    
+
+    PIO_Configure( pTC, PIO_LISTSIZE( pTC ) );
+
+
+
+// FIXME:
+//    PIO_ConfigureIt( &pinPhoneRST, ISR_PhoneRST ) ;
+//    PIO_EnableIt( &pinPhoneRST ) ;
+
+    /* enable interrupts for Compare-C and External Trigger */
+    TC0->TC_CHANNEL[0].TC_IER = TC_IER_CPCS | TC_IER_ETRGS;
+
+    //...
+     /* Enable master clock for TC0 */
+//     TC0->TC_CHANNEL[0].TC_CCR
+
+    /* Reset to start timers */
+    //...
+}