I am struggling to setup an ISR/DSR for a PORT on the K60. My goal is to get an
ISR/DSR when Pin 19 of PORTA transitions from high to low. This is pin PTA19 of
the device.
My non-working code and complete code below.
What the code tries to do is setup PORTA PIN19 as input. Then take the PCR
register and set the interrupt to work off a falling edge.
Then create the ISR/DSR.
When I toggle the pin, nothing happens.
FYI the hardware works with MQX, so I know the hardware is ok. I use it the
same way under MQX where I get an ISR from a negative edge. And I have put a
scope on it to make sure there is an edge. So I am quite sure the problem is
the code.
This code was generated by trying to understand the Kinetis code, but things
were not clear to me. Some macros use __pin to mean different things. So this
is my best guess.
Does anyone know how to do this?
PORT SETUP CODE
================
cyghwr_hal_kinetis_port_t *port_p;
CYGHWR_HAL_KINETIS_GPIO_PIN_DDR_IN(ALERT_PORT, ALERT_PIN);
// Get address for PORTA
port_p = Ports[0];
// 0xA means interrupt on falling edge.
// Read modify write PCR
port_p->pcr[ALERT_PIN] =
(port_p->pcr[ALERT_PIN] & 0xFFF0FFFF) |
(0xA << 16);
// Create an ISR/DSR for PORTA.
// Assuming the priority is what the DSR will run at.
// No data passed.
cyg_interrupt_create(
CYGNUM_HAL_INTERRUPT_PORTA, // Vector
3,
// Priority
(cyg_addrword_t)0, // Data
alert_isr, // ISR
alert_dsr, // DSR
&alert_handle, // Handle
&alert_interrupt); // INTR
cyg_thread_suspend(cyg_thread_self());
}
ALL CODE
=========
#ifndef ALERT_H_
#define ALERT_H_
#include <cyg/kernel/kapi.h>
#include <cyg/hal/var_io_gpio.h>
#include <cyg/hal/drv_api.h>
#include <cyg/hal/var_io.h>
#define ALERT_PORT A
#define ALERT_PIN 19
extern void start_alert(cyg_addrword_t data);
#endif
#include "alert.h"
cyg_handle_t alert_handle;
cyg_interrupt alert_interrupt;
cyghwr_hal_kinetis_port_t * const Ports[] = {
CYGHWR_HAL_KINETIS_PORTA_P, CYGHWR_HAL_KINETIS_PORTB_P,
CYGHWR_HAL_KINETIS_PORTC_P, CYGHWR_HAL_KINETIS_PORTD_P,
CYGHWR_HAL_KINETIS_PORTE_P
};
cyg_uint32 alert_isr( cyg_vector_t vector,
cyg_addrword_t data
)
{
return CYG_ISR_HANDLED | CYG_ISR_CALL_DSR;
}
void alert_dsr( cyg_vector_t vector,
cyg_ucount32 count,
cyg_addrword_t data
)
{
}
void pmbus_alert_callback(void)
{
}
void start_alert(cyg_addrword_t data)
{
cyghwr_hal_kinetis_port_t *port_p;
CYGHWR_HAL_KINETIS_GPIO_PIN_DDR_IN(ALERT_PORT, ALERT_PIN);
// Get address for PORTA
port_p = Ports[0];
// 0xA means interrupt on falling edge.
// Read modify write PCR
port_p->pcr[ALERT_PIN] =
(port_p->pcr[ALERT_PIN] & 0xFFF0FFFF) |
(0xA << 16);
// Create an ISR/DSR for PORTA.
// Assuming the priority is what the DSR will run at.
// No data passed.
cyg_interrupt_create(
CYGNUM_HAL_INTERRUPT_PORTA, // Vector
3,
// Priority
(cyg_addrword_t)0, // Data
alert_isr, // ISR
alert_dsr, // DSR
&alert_handle, // Handle
&alert_interrupt); // INTR
cyg_thread_suspend(cyg_thread_self());
}
