1 // ----------------------------------------------------------------------------

     2 //         ATMEL Microcontroller Software Support  -  ROUSSET  -

     3 // ----------------------------------------------------------------------------

     4 // DISCLAIMER:  THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR

     5 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

     6 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE

     7 // DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,

     8 // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

     9 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,

    10 // OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

    11 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

    12 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,

    13 // EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    14 // ----------------------------------------------------------------------------

    15 // File Name           : interrupt_timer.c

    16 // Object              : Timer interrupt management

    17 //                     : Use AT91B_LED7 & AT91B_LED8 for status interrupt

    18 // Creation            : JPP   08-Sep-2005

    19 // ----------------------------------------------------------------------------

    20 

    21 // Include Standard LIB  files

    22 #include "config.h"

    23 

    24 //* Global variable

    25 int timer0_interrupt = 0;

    26 

    27 #define TIMER0_INTERRUPT_LEVEL		1

    28 

    29 /*-----------------*/

    30 /* Clock Selection */

    31 /*-----------------*/

    32 #define TC_CLKS                  0x7

    33 #define TC_CLKS_MCK2             0x0

    34 #define TC_CLKS_MCK8             0x1

    35 #define TC_CLKS_MCK32            0x2

    36 #define TC_CLKS_MCK128           0x3

    37 #define TC_CLKS_MCK1024          0x4

    38 

    39 //*------------------------- Internal Function --------------------------------

    40 //*----------------------------------------------------------------------------

    41 //* Function Name       : AT91F_TC_Open

    42 //* Object              : Initialize Timer Counter Channel and enable is clock

    43 //* Input Parameters    : <tc_pt> = TC Channel Descriptor Pointer

    44 //*                       <mode> = Timer Counter Mode

    45 //*                     : <TimerId> = Timer peripheral ID definitions

    46 //* Output Parameters   : None

    47 //*----------------------------------------------------------------------------

    48 void AT91F_TC_Open ( AT91PS_TC TC_pt, unsigned int Mode, unsigned int TimerId)

    49 {

    50   unsigned int dummy;

    51 

    52   //* First, enable the clock of the TIMER

    53   AT91F_PMC_EnablePeriphClock ( AT91C_BASE_PMC, 1<< TimerId ) ;

    54 

    55   //* Disable the clock and the interrupts

    56   TC_pt->TC_CCR = AT91C_TC_CLKDIS ;

    57   TC_pt->TC_IDR = 0xFFFFFFFF ;

    58 

    59   //* Clear status bit

    60   dummy = TC_pt->TC_SR;

    61   //* Suppress warning variable "dummy" was set but never used

    62   dummy = dummy;

    63   //* Set the Mode of the Timer Counter

    64   TC_pt->TC_CMR = Mode ;

    65 

    66   //* Enable the clock

    67   TC_pt->TC_CCR = AT91C_TC_CLKEN ;

    68 }

    69 //*------------------------- Interrupt Function -------------------------------

    70 

    71 //*----------------------------------------------------------------------------

    72 //* Function Name       : timer0_c_irq_handler

    73 //* Object              : C handler interrupt function calAT91B_LED by the interrupts

    74 //*                       assembling routine

    75 //* Output Parameters   : increment count_timer0_interrupt

    76 //*----------------------------------------------------------------------------

    77 void timer0_c_irq_handler(void)

    78 {

    79   AT91PS_TC TC_pt = AT91C_BASE_TC0;

    80   unsigned int dummy;

    81   //* AcknowAT91B_LEDge interrupt status

    82   dummy = TC_pt->TC_SR;

    83   //* Suppress warning variable "dummy" was set but never used

    84   dummy = dummy;

    85   timer0_interrupt = TRUE;

    86 }

    87 

    88 //*-------------------------- External Function -------------------------------

    89 

    90 //*----------------------------------------------------------------------------

    91 //* Function Name       : timer_init

    92 //* Object              : Init timer counter

    93 //* Input Parameters    : none

    94 //* Output Parameters   : TRUE

    95 //*----------------------------------------------------------------------------

    96 void timer_init (unsigned int time)

    97 {

    98   //* Open timer0

    99   AT91F_TC_Open(AT91C_BASE_TC0,TC_CLKS_MCK8 | AT91C_TC_WAVESEL_UP_AUTO,AT91C_ID_TC0);

   100 

   101   //* Open Timer 0 interrupt

   102   AT91F_AIC_ConfigureIt ( AT91C_BASE_AIC, AT91C_ID_TC0, TIMER0_INTERRUPT_LEVEL,AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, timer0_c_irq_handler);

   103   AT91C_BASE_TC0->TC_IER = AT91C_TC_CPCS;  //  IRQ enable CPC

   104   AT91F_AIC_EnableIt (AT91C_BASE_AIC, AT91C_ID_TC0);

   105 

   106   AT91C_BASE_TC0->TC_RC = (unsigned int)(AT91C_MASTER_CLOCK / 8 * time / 1000);

   107 

   108   //* Start timer0

   109   AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG ;

   110 }