/************************************************************************
* DESCRIPTION: Starts TCP/IP hardware timer. delay_ms - period of timer (ms)
* e.g. Time-out period = (1/FNET_CFG_SYSTEM_CLOCK_KHZ)x(1)x(124+1)x528x100 = 100 ms
*************************************************************************/
fnet_return_t fnet_cpu_timer_init( fnet_time_t period_ms )
{
fnet_return_t result;
fnet_uint32_t timeout;
/* Imstall interrupt handler and enable interrupt in NVIC.
*/
result = fnet_isr_vector_init(FNET_CFG_CPU_TIMER_VECTOR_NUMBER, fnet_cpu_timer_handler_top,
fnet_timer_handler_bottom, FNET_CFG_CPU_TIMER_VECTOR_PRIORITY, 0u);
if(result == FNET_OK)
{
/* Initialize the PIT timer to generate an interrupt every period_ms */
/* Enable the clock to the PIT module. Clock for PIT Timers to be enabled */
FNET_MK_SIM_SCGC6 |= FNET_MK_SIM_SCGC6_PIT_MASK;
/* Enable the PIT timer module. */
FNET_MK_PIT_MCR &= ~FNET_MK_PIT_MCR_MDIS_MASK;
/* Calculate the timeout value. */
timeout = period_ms * FNET_MK_PERIPH_CLOCK_KHZ;
FNET_MK_PIT_LDVAL(FNET_CFG_CPU_TIMER_NUMBER) = timeout;
/* Enable the timer and enable interrupts */
FNET_MK_PIT_TCTRL(FNET_CFG_CPU_TIMER_NUMBER) |= FNET_MK_PIT_TCTRL_TEN_MASK | FNET_MK_PIT_TCTRL_TIE_MASK;
}
return result;
}
/************************************************************************
* NAME: fnet_cpu_timer_init
*
* DESCRIPTION: Starts TCP/IP hardware timer. delay_ms - period of timer (ms)
* e.g. Time-out period = (1/FNET_CFG_SYSTEM_CLOCK_KHZ)x(1)x(124+1)x528x100 = 100 ms
*************************************************************************/
int fnet_cpu_timer_init( unsigned int period_ms )
{
int result;
/* Install interrupt handler.
*/
result = fnet_isr_vector_init(FNET_TIMER_VECTOR_NUMBER, fnet_cpu_timer_handler_top,
fnet_timer_handler_bottom, FNET_TIMER_INT_LEVEL);
if(result == FNET_OK)
{
FNET_MPC_PITRTI_MCR = 0x04;
FNET_MPC_PITRTI_TCTRL(FNET_TIMER_NUMBER) = 0x0;
FNET_MPC_PITRTI_LDVAL(FNET_TIMER_NUMBER) = period_ms * FNET_TIMER_CLKIN_PER_MS;
FNET_MPC_PITRTI_TCTRL(FNET_TIMER_NUMBER) = 0x3;
}
return result;
}
