timer_lpc2.c

Go to the documentation of this file.
00001 
00039 #include "cfg/cfg_timer.h"
00040 #include <cfg/macros.h> // BV()
00041 #include <cfg/debug.h> // BV()
00042 
00043 #include <drv/vic_lpc2.h>
00044 #include <io/lpc23xx.h>
00045 #include "timer_lpc2.h"
00046 
00048 #if (CONFIG_TIMER == TIMER0_COMPARE0)
00049     #define TIMER0_ID 4
00050     void timer_hw_init(void)
00051     {
00052         /* Power on timer0 */
00053         PCONP |= BV(1);
00054 
00055         /* Set TIMER0 clk to CPU_FREQ */
00056         PCLKSEL0 &= ~0x0C;
00057         PCLKSEL0 |= 0x04;
00058 
00059         /* reset prescaler counter */
00060         T0PR = 0;
00061 
00062         /* Set match register 0 */
00063         T0MR0 = TIMER_HW_CNT;
00064         /* IRQ and reset counter on compare match 0 */
00065         T0MCR &= ~0x03;
00066         T0MCR |= 0x03;
00067         /* Reset timer0 counter and prescaler */
00068         T0TCR = 0x02;
00069 
00070         vic_setVector(TIMER0_ID, timer_handler);
00071         vic_enable(TIMER0_ID);
00072 
00073         /* Start timer0 */
00074         T0TCR = 0x01;
00075     }
00076 
00077 
00078 #else
00079     #error Unimplemented value for CONFIG_TIMER
00080 #endif /* CONFIG_TIMER */
00081