clockdrv.c File Reference

MC9328MXL clock specific using the System Timer. More...

#include <rtems.h>
#include <bsp.h>
#include <bsp/irq.h>
#include <mc9328mxl.h>
#include <rtems/bspIo.h>
#include "../../../shared/dev/clock/clockimpl.h"

Macros
#define	Clock_driver_support_at_tick(arg)
#define	Clock_driver_support_install_isr(_new)    BSP_install_rtems_irq_handler(&clock_isr_data)
#define	Clock_driver_support_initialize_hardware()
#define	CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER

Functions
void	Clock_isr (rtems_irq_hdl_param arg)

Variables
rtems_irq_connect_data	clock_isr_data

Detailed Description

MC9328MXL clock specific using the System Timer.

Macro Definition Documentation

Clock_driver_support_at_tick

#define Clock_driver_support_at_tick

(

arg

)

Value:

  do {                                               \
    uint32_t reg;                                    \
                                                     \
    reg = MC9328MXL_TMR1_TSTAT;                      \
    (void) reg; /* avoid set but not used warning */ \
    MC9328MXL_TMR1_TSTAT = 0;                        \
  } while(0)

When we get the clock interrupt

• clear the interrupt bit?
• restart the timer?

Clock_driver_support_initialize_hardware

#define Clock_driver_support_initialize_hardware

(

void

)

Value:

  do { \
        int freq; \
        int cnt; \
        freq = get_perclk1_freq(); \
        printk("perclk1 freq is %d\n", freq); \
        cnt = ((long long)freq * rtems_configuration_get_microseconds_per_tick() + 500000) / 1000000;\
        printk("cnt freq is %d\n", cnt); \
        MC9328MXL_TMR1_TCMP = cnt; \
        /* use PERCLK1 as input, enable timer */ \
        MC9328MXL_TMR1_TCTL = (MC9328MXL_TMR_TCTL_CLKSRC_PCLK1 | \
                               MC9328MXL_TMR_TCTL_TEN | \
                               MC9328MXL_TMR_TCTL_IRQEN); \
        /* set prescaler to 1 (register value + 1) */ \
        MC9328MXL_TMR1_TPRER = 0; \
     } while (0)

Initialize the hardware for the clock

• Set the frequency
• enable it
• clear any pending interrupts

Since you may want the clock always running, you can enable interrupts here. If you do so, the clock_isr_on(), clock_isr_off(), and clock_isr_is_on() functions can be NOPs.

Clock_driver_support_install_isr

#define Clock_driver_support_install_isr

(

_new

)

BSP_install_rtems_irq_handler(&clock_isr_data)

Installs the clock ISR. You shouldn't need to change this.

Variable Documentation

clock_isr_data

rtems_irq_connect_data clock_isr_data

Initial value:

= {
  .name   = BSP_INT_TIMER1,
  .hdl    = Clock_isr,
  .handle = (void *)BSP_INT_TIMER1,
  .on     = clock_isr_on,
  .off    = clock_isr_off,
  .isOn   = clock_isr_is_on,
}