Update for MKL27Z

example-fs-bb48/touch.c

@@ -19,7 +19,7 @@ struct TPM {
   volatile uint32_t CONF;
 };
 
-static struct TPM *const TPM1 = (struct TPM *const)0x40039000;
+static struct TPM *const TPM1 = (struct TPM *)0x40039000;
 
 static chopstx_intr_t tpm1_intr;
 #define INTR_REQ_TPM1 18
@@ -36,8 +36,14 @@ touch_get (void)
               | (0<<0) /* puddselect= 0         */
               ;
 
+  /* 
+   * Start the timer's counter. 
+   * TOF clear, TOIE=1, CPWMS=0, CMOD=1, PS=011.
+   */
+  TPM1->SC = 0xcb;
+
   /* Let the register to pull it up.  */
-  PORTB->PCR1 = (1<<3) /* TPM1_CH1              */
+  PORTB->PCR1 = (3<<8) /* TPM1_CH1              */
               | (0<<6) /* DriveStrengthEnable=0 */
               | (0<<4) /* PassiveFilterEnable=0 */
               | (1<<2) /* SlewRateEnable = slow */
@@ -46,8 +52,10 @@ touch_get (void)
               ;
 
   chopstx_intr_wait (&tpm1_intr);
-  /* Clear overflow.  */
-  TPM1->SC |= 0x80;
+  /* Clear overflow and CH1 capture.  */
+  TPM1->STATUS = 0x102;
+  /* Stop the counter.  */
+  TPM1->SC = 0;
 
   return TPM1->C1V;
 }
@@ -58,21 +66,13 @@ touch_init (void)
 {
   chopstx_claim_irq (&tpm1_intr, INTR_REQ_TPM1);
 
-  /* TOF clear, TOIE=1, CPWMS=0, CMOD=1, PS=000.  */
-  TPM1->SC = 0xc4;
-
   /* Input capture mode: MSB = 0, MSA = 0 */
-  /*        Rising edge: ELSB=0 ELSA=1 */
-  TPM1->C1SC = 0x82;
+  /*   Rising edge: ELSB=0 ELSA=1 */
+  TPM1->C1SC = 0x84;
   TPM1->POL=0;
 
-  /* Triggered by TPM1_CH1.   */
-  /*   channel 1: TRGSEL=0010 */
-  /*   external:  TRGSRC=0    */
-  /*   active low:TRGPOL=1    */
-  /* stop on overflow: CSOO=1 */ 
-  /* start on trigger: CSOT=1 */
-  TPM1->CONF = 0x02c30000;
-
-  touch_get ();
+  /* No trigger.   */
+  /* Stop on overflow: CSOO=1 */ 
+  /* Run the timer in the debug mode */
+  TPM1->CONF = 0x000200c0;
 }