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100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
#include <stdint.h>
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#include <stdlib.h>
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#include <chopstx.h>
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#include <mcu/mkl27z.h>
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struct TPM {
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volatile uint32_t SC;
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volatile uint32_t CNT;
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volatile uint32_t MOD;
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volatile uint32_t C0SC;
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volatile uint32_t C0V;
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volatile uint32_t C1SC;
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volatile uint32_t C1V;
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uint32_t rsvd0[13];
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volatile uint32_t STATUS;
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uint32_t rsvd1[7];
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volatile uint32_t POL;
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uint32_t rsvd2[4];
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volatile uint32_t CONF;
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};
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static struct TPM *const TPM1 = (struct TPM *)0x40039000;
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static chopstx_intr_t tpm1_intr;
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#define INTR_REQ_TPM1 18
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static void
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gpio_assert_low (void)
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{
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/* Assert LOW. */
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PORTB->PCR1 = (1<<8) /* GPIO */
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| (0<<6) /* DriveStrengthEnable=0 */
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| (0<<4) /* PassiveFilterEnable=0 */
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| (1<<2) /* SlewRateEnable = slow */
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| (0<<1) /* pull enable = 0 */
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| (0<<0) /* pull up select= 0 */
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;
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GPIOB->PCOR = (1 << 1); /* PTB1: Clear: Output 0 */
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}
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uint16_t
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touch_get (void)
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{
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chopstx_prio_t prio_old;
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uint16_t v;
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prio_old = chopstx_setpriority (CHOPSTX_PRIO_INHIBIT_PREEMPTION);
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/*
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* Start the timer's counter.
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* TOF clear, TOIE=1, CPWMS=0, CMOD=1, PS=011.
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*/
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TPM1->SC = 0xcb;
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/* Let the register to pull it up. */
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PORTB->PCR1 = (3<<8) /* TPM1_CH1 */
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| (0<<6) /* DriveStrengthEnable=0 */
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| (0<<4) /* PassiveFilterEnable=0 */
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| (1<<2) /* SlewRateEnable = slow */
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| (0<<1) /* pull enable = 0 */
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| (0<<0) /* pullup select= 0 */
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;
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chopstx_setpriority (prio_old);
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chopstx_intr_wait (&tpm1_intr);
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gpio_assert_low ();
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v = TPM1->C1V;
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/* Clear overflow and CH1 capture. */
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TPM1->STATUS = 0x102;
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/* Stop the timer. */
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TPM1->SC = 0;
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TPM1->CNT = 0xffff; /* Writing causes reset of the counter. */
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chopstx_intr_done (&tpm1_intr);
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return v;
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}
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void
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touch_init (void)
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{
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chopstx_claim_irq (&tpm1_intr, INTR_REQ_TPM1);
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/* Input capture mode: MSB = 0, MSA = 0 */
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/* Rising edge: ELSB=0 ELSA=1 */
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TPM1->C1SC = 0x84;
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TPM1->POL=0;
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/* No trigger. */
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/* Stop on overflow: CSOO=1 */
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/* Run the timer in the debug mode */
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TPM1->CONF = 0x000200c0;
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TPM1->CNT = 0xffff; /* Writing causes reset of the counter. */
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gpio_assert_low ();
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}
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