peter@521: // ----------------------------------------------------------------------------
peter@521: //         ATMEL Microcontroller Software Support  -  ROUSSET  -
peter@521: // ----------------------------------------------------------------------------
peter@521: // DISCLAIMER:  THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
peter@521: // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
peter@521: // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
peter@521: // DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
peter@521: // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
peter@521: // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
peter@521: // OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
peter@521: // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
peter@521: // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
peter@521: // EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
peter@521: // ----------------------------------------------------------------------------
peter@521: // File Name           : interrupt_timer.c
peter@521: // Object              : Timer interrupt management
peter@521: //                     : Use AT91B_LED7 & AT91B_LED8 for status interrupt
peter@521: // Creation            : JPP   08-Sep-2005
peter@521: // ----------------------------------------------------------------------------
peter@521: 
peter@521: // Include Standard LIB  files
peter@521: #include "config.h"
peter@521: 
peter@521: //* Global variable
peter@521: int timer0_interrupt = 0;
peter@521: 
peter@521: #define TIMER0_INTERRUPT_LEVEL		1
peter@521: 
peter@521: /*-----------------*/
peter@521: /* Clock Selection */
peter@521: /*-----------------*/
peter@521: #define TC_CLKS                  0x7
peter@521: #define TC_CLKS_MCK2             0x0
peter@521: #define TC_CLKS_MCK8             0x1
peter@521: #define TC_CLKS_MCK32            0x2
peter@521: #define TC_CLKS_MCK128           0x3
peter@521: #define TC_CLKS_MCK1024          0x4
peter@521: 
peter@521: //*------------------------- Internal Function --------------------------------
peter@521: //*----------------------------------------------------------------------------
peter@521: //* Function Name       : AT91F_TC_Open
peter@521: //* Object              : Initialize Timer Counter Channel and enable is clock
peter@521: //* Input Parameters    : <tc_pt> = TC Channel Descriptor Pointer
peter@521: //*                       <mode> = Timer Counter Mode
peter@521: //*                     : <TimerId> = Timer peripheral ID definitions
peter@521: //* Output Parameters   : None
peter@521: //*----------------------------------------------------------------------------
peter@521: void AT91F_TC_Open ( AT91PS_TC TC_pt, unsigned int Mode, unsigned int TimerId)
peter@521: {
peter@521:   unsigned int dummy;
peter@521: 
peter@521:   //* First, enable the clock of the TIMER
peter@521:   AT91F_PMC_EnablePeriphClock ( AT91C_BASE_PMC, 1<< TimerId ) ;
peter@521: 
peter@521:   //* Disable the clock and the interrupts
peter@521:   TC_pt->TC_CCR = AT91C_TC_CLKDIS ;
peter@521:   TC_pt->TC_IDR = 0xFFFFFFFF ;
peter@521: 
peter@521:   //* Clear status bit
peter@521:   dummy = TC_pt->TC_SR;
peter@521:   //* Suppress warning variable "dummy" was set but never used
peter@521:   dummy = dummy;
peter@521:   //* Set the Mode of the Timer Counter
peter@521:   TC_pt->TC_CMR = Mode ;
peter@521: 
peter@521:   //* Enable the clock
peter@521:   TC_pt->TC_CCR = AT91C_TC_CLKEN ;
peter@521: }
peter@521: //*------------------------- Interrupt Function -------------------------------
peter@521: 
peter@521: //*----------------------------------------------------------------------------
peter@521: //* Function Name       : timer0_c_irq_handler
peter@521: //* Object              : C handler interrupt function calAT91B_LED by the interrupts
peter@521: //*                       assembling routine
peter@521: //* Output Parameters   : increment count_timer0_interrupt
peter@521: //*----------------------------------------------------------------------------
peter@521: void timer0_c_irq_handler(void)
peter@521: {
peter@521:   AT91PS_TC TC_pt = AT91C_BASE_TC0;
peter@521:   unsigned int dummy;
peter@521:   //* AcknowAT91B_LEDge interrupt status
peter@521:   dummy = TC_pt->TC_SR;
peter@521:   //* Suppress warning variable "dummy" was set but never used
peter@521:   dummy = dummy;
peter@521:   timer0_interrupt = TRUE;
peter@521: }
peter@521: 
peter@521: //*-------------------------- External Function -------------------------------
peter@521: 
peter@521: //*----------------------------------------------------------------------------
peter@521: //* Function Name       : timer_init
peter@521: //* Object              : Init timer counter
peter@521: //* Input Parameters    : none
peter@521: //* Output Parameters   : TRUE
peter@521: //*----------------------------------------------------------------------------
peter@521: void timer_init (unsigned int time)
peter@521: {
peter@521:   //* Open timer0
peter@521:   AT91F_TC_Open(AT91C_BASE_TC0,TC_CLKS_MCK8 | AT91C_TC_WAVESEL_UP_AUTO,AT91C_ID_TC0);
peter@521: 
peter@521:   //* Open Timer 0 interrupt
peter@521:   AT91F_AIC_ConfigureIt ( AT91C_BASE_AIC, AT91C_ID_TC0, TIMER0_INTERRUPT_LEVEL,AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, timer0_c_irq_handler);
peter@521:   AT91C_BASE_TC0->TC_IER = AT91C_TC_CPCS;  //  IRQ enable CPC
peter@521:   AT91F_AIC_EnableIt (AT91C_BASE_AIC, AT91C_ID_TC0);
peter@521: 
peter@521:   AT91C_BASE_TC0->TC_RC = (unsigned int)(AT91C_MASTER_CLOCK / 8 * time / 1000);
peter@521: 
peter@521:   //* Start timer0
peter@521:   AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG ;
peter@521: }