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/*
* systick.cpp
*
* Created on: 2011/08/11
* Author: atsu
*/
#include "delay.h"
volatile static unsigned long msTicks; /* counts 1ms timeTicks */
volatile USER_TIMER_FUNC userfunc; //user function's pointer
/*------------------------------------------------------------------------------
delays number of tick Systicks (happens every 1 ms)
*------------------------------------------------------------------------------*/
void delay (unsigned long dlyTicks) {
volatile unsigned long curTicks;
curTicks = msTicks;
while ((msTicks - curTicks) < dlyTicks);
}
unsigned long millis(void)
{
return msTicks;
}
void delayMicroseconds (unsigned long us)
{
volatile unsigned long usTicks;
//LPC_TMR16B0->TC = 0; //reset timer counter
usTicks = LPC_TMR32B1->TC; //usTicks = micros();
while ((LPC_TMR32B1->TC - usTicks) < us); //while ((micros() - usTicks) < us);
}
unsigned long micros(void)
{
return LPC_TMR32B1->TC;
}
//for micros() and delayMicroseconds()
void setup_TIMER32_1(void)
{
LPC_SYSCON->SYSAHBCLKCTRL |= (1UL << 10); // Enable clock for CT32B1 module
NVIC_DisableIRQ(TIMER_32_1_IRQn);
LPC_TMR32B1->PR = 48; //48MHz/48=1MHzに分周する
LPC_TMR32B1->TCR = 1; //タイマスタート
}
unsigned long attachMicroseconds(USER_TIMER_FUNC func,int us)
{
//LPC_SYSCON->SYSAHBCLKCTRL |= (1UL << 10); // Enable clock for CT32B1 module
LPC_TMR32B1->TCR = 0; //タイマストップ
LPC_TMR32B1->TC = 0;
if(us <= 1)return 0;
// LPC_TMR32B1->PR = 48; //48MHz/48=1MHzに分周する
LPC_TMR32B1->MR2 = us - 1; //us
LPC_TMR32B1->MCR = (0x3 << 6); // clear at MR2 and Interrupt
NVIC_EnableIRQ(TIMER_32_1_IRQn);
NVIC_SetPriority(TIMER_32_1_IRQn,0);//割り込みレベル
LPC_TMR32B1->TCR = 1; //タイマスタート
userfunc = func;
return 0;
}
void detachMicroseconds(void)
{
LPC_TMR32B1->MR2 = 0xffffffff; //us
NVIC_DisableIRQ(TIMER_32_1_IRQn);
}
/*----------------------------------------------------------------------------
Timer32_0_Handler
*----------------------------------------------------------------------------*/
void TIMER32_1_IRQHandler (void)
{
if (LPC_TMR32B1->IR & (1 << 2)) // MR2 Interrupt
{
if(userfunc)userfunc();
// Clear Flag
LPC_TMR32B1->IR = (1 << 2);
}
}
/*----------------------------------------------------------------------------
SysTick_Handler
*----------------------------------------------------------------------------*/
void SysTick_Handler(void) {
msTicks++; /* increment counter necessary in Delay() */
}
void setup_systick (void) {
//LPC_SYSCON->SYSAHBCLKCTRL |= (1<<6);
// Setup SysTick Timer for 1 msec interrupts
// Configure System tick timer in 10msec period
volatile unsigned long period = SystemCoreClock / 1000; // Period for 1msec SYSTICK
SysTick_Config(period); // Configuration
#if 1
if ( !(SysTick->CTRL & SysTick_CTRL_CLKSOURCE_Msk) )
{
/* When external reference clock is used(CLKSOURCE in
Systick Control and register bit 2 is set to 0), the
SYSTICKCLKDIV must be a non-zero value and 2.5 times
faster than the reference clock.
When core clock, or system AHB clock, is used(CLKSOURCE
in Systick Control and register bit 2 is set to 1), the
SYSTICKCLKDIV has no effect to the SYSTICK frequency. See
more on Systick clock and status register in Cortex-M3
technical Reference Manual. */
LPC_SYSCON->SYSTICKCLKDIV = 0x08;
}
#endif
}
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