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【开源】线性CCD自适应性算法攻略

/*
 * File:        rtc.c
 * Purpose:     Provide common RTC routines
 *
 * Notes:
 *
 */


#include "common.h"
#include "rtc.h"
#include "arm_cm4.h"

/********************************************************************/
/*
 * Initialize the RTC
 *
 *
 * Parameters:
 *  seconds         Start value of seconds register
 *  alarm           Time in seconds of first alarm. Set to 0xFFFFFFFF to effectively disable alarm
 *  c_interval      Interval at which to apply time compensation can range from 1 second (0x0) to 256 (0xFF)
 *  c_value         Compensation value ranges from -127 32kHz cycles to +128 32 kHz cycles
 *                  80h Time prescaler register overflows every 32896 clock cycles.
 *                  FFh Time prescaler register overflows every 32769 clock cycles.
 *                  00h Time prescaler register overflows every 32768 clock cycles.
 *                  01h Time prescaler register overflows every 32767 clock cycles.
 *                  7Fh Time prescaler register overflows every 32641 clock cycles.
 *  interrupt       TRUE or FALSE
 */

void rtc_init(uint32 seconds, uint32 alarm, uint8 c_interval, uint8 c_value, uint8 interrupt)
{
    int i;

    /*enable the clock to SRTC module register space*/
    SIM_SCGC6 |= SIM_SCGC6_RTC_MASK;

    /*Only VBAT_POR has an effect on the SRTC, RESET to the part does not, so you must manually reset the SRTC to make sure everything is in a known state*/
    /*clear the software reset bit*/
    RTC_CR  = RTC_CR_SWR_MASK;
    RTC_CR  &= ~RTC_CR_SWR_MASK;

    /*Enable the interrupt*/
    if(interrupt)
        enable_irq(66);

    /*Enable the oscillator*/
    RTC_CR |= RTC_CR_OSCE_MASK;

    /*Wait to all the 32 kHz to stabilize, refer to the crystal startup time in the crystal datasheet*/
    for(i = 0; i < 0x600000; i++);

    /*Set time compensation parameters*/
    RTC_TCR = RTC_TCR_CIR(c_interval) | RTC_TCR_TCR(c_value);

    /*Configure the timer seconds and alarm registers*/
    RTC_TSR = seconds;
    RTC_TAR = alarm;

    /*Enable the counter*/
    RTC_SR |= RTC_SR_TCE_MASK;

}
#ifndef PMC
void rtc_isr(void)
{

    if((RTC_SR & RTC_SR_TIF_MASK) == 0x01)
    {
        printf("SRTC time invalid interrupt entered...\r\n");
        RTC_SR &= 0x07;  //clear TCE, or RTC_TSR can  not be written
        RTC_TSR = 0x00000000;  //clear TIF
    }
    else if((RTC_SR & RTC_SR_TOF_MASK) == 0x02)
    {
        printf("SRTC time overflow interrupt entered...\r\n");
        RTC_SR &= 0x07;  //clear TCE, or RTC_TSR can  not be written
        RTC_TSR = 0x00000000;  //clear TOF
    }
    else if((RTC_SR & RTC_SR_TAF_MASK) == 0x04)
    {
        printf("SRTC alarm interrupt entered...\r\n");
        printf("Time Seconds Register value is: %i\n", RTC_TSR);
        RTC_TAR += 1;// Write new alarm value, to generate an alarm every second add 1

    }
    else
    {
        printf("No valid Flag was set!\n");
    }
    return;
}
#endif