69 lines
1.4 KiB
C
69 lines
1.4 KiB
C
/* ___INGO___ */
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#include <arm/NXP/LPC17xx/LPC17xx.h>
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#include "bits.h"
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#include "config.h"
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#include "timer.h"
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#include "clock.h"
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/* bit definitions */
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#define RITINT 0
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#define RITEN 3
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#define PCRIT 16
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volatile tick_t ticks;
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void __attribute__((weak,noinline)) SysTick_Hook(void) {
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/* Empty function for hooking the systick handler */
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}
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/* Systick interrupt handler */
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void SysTick_Handler(void) {
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ticks++;
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SysTick_Hook();
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}
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void timer_init(void) {
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/* turn on power to RIT */
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BITBAND(LPC_SC->PCONP, PCRIT) = 1;
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/* clear RIT mask */
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LPC_RIT->RIMASK = 0; /*xffffffff;*/
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/* PCLK = CCLK */
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BITBAND(LPC_SC->PCLKSEL1, 26) = 1;
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BITBAND(LPC_SC->PCLKSEL1, PCLK_TIMER3) = 1;
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/* enable SysTick */
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SysTick_Config(SysTick->CALIB & SysTick_CALIB_TENMS_Msk);
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}
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extern int testval;
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void delay_us(unsigned int time) {
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/* Prepare RIT */
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LPC_RIT->RICOUNTER = 0;
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LPC_RIT->RICOMPVAL = (CONFIG_CPU_FREQUENCY / 1000000) * time;
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LPC_RIT->RICTRL = BV(RITEN) | BV(RITINT);
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/* Wait until RIT signals an interrupt */
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while (!(BITBAND(LPC_RIT->RICTRL, RITINT))) ;
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/* Disable RIT */
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LPC_RIT->RICTRL = 0;
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}
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void delay_ms(unsigned int time) {
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/* Prepare RIT */
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LPC_RIT->RICOUNTER = 0;
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LPC_RIT->RICTRL = BV(RITEN) | BV(RITINT);
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LPC_RIT->RICOMPVAL = (CONFIG_CPU_FREQUENCY / 1000) * time;
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/* Wait until RIT signals an interrupt */
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while (!(BITBAND(LPC_RIT->RICTRL, RITINT))) ;
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/* Disable RIT */
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LPC_RIT->RICTRL = 0;
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}
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