void up_enable_irq(int irq)
{
/* This will be called on each interrupt exit whether the interrupt can be
* enambled or not. So this assertion is necessarily lame.
*/
DEBUGASSERT((unsigned)irq < NR_IRQS);
/* Check for external interrupt */
if (irq >= NUC_IRQ_INTERRUPT && irq < NUC_IRQ_INTERRUPT + 32)
{
/* Set the appropriate bit in the ISER register to enable the
* interrupt
*/
putreg32((1 << (irq - NUC_IRQ_INTERRUPT)), ARMV6M_NVIC_ISER);
}
/* Handle processor exceptions. Only SysTick can be disabled */
else if (irq == NUC_IRQ_SYSTICK)
{
modifyreg32(ARMV6M_SYSTICK_CSR, 0, SYSTICK_CSR_ENABLE);
}
nuc_dumpnvic("enable", irq);
}
void up_irqinitialize(void)
{
uint32_t regaddr;
int i;
/* Disable all interrupts */
putreg32(0xffffffff, ARMV6M_NVIC_ICER);
/* Set all interrupts (and exceptions) to the default priority */
putreg32(DEFPRIORITY32, ARMV6M_SYSCON_SHPR2);
putreg32(DEFPRIORITY32, ARMV6M_SYSCON_SHPR3);
/* Now set all of the interrupt lines to the default priority */
for (i = 0; i < 8; i++)
{
regaddr = ARMV6M_NVIC_IPR(i);
putreg32(DEFPRIORITY32, regaddr);
}
/* currents_regs is non-NULL only while processing an interrupt */
current_regs = NULL;
/* Attach the SVCall and Hard Fault exception handlers. The SVCall
* exception is used for performing context switches; The Hard Fault
* must also be caught because a SVCall may show up as a Hard Fault
* under certain conditions.
*/
irq_attach(NUC_IRQ_SVCALL, up_svcall);
irq_attach(NUC_IRQ_HARDFAULT, up_hardfault);
/* Set the priority of the SVCall interrupt */
#ifdef CONFIG_ARCH_IRQPRIO
/* up_prioritize_irq(NUC_IRQ_PENDSV, NVIC_SYSH_PRIORITY_MIN); */
#endif
nuc_prioritize_syscall(NVIC_SYSH_SVCALL_PRIORITY);
/* Attach all other processor exceptions (except reset and sys tick) */
#ifdef CONFIG_DEBUG
irq_attach(NUC_IRQ_NMI, nuc_nmi);
irq_attach(NUC_IRQ_PENDSV, nuc_pendsv);
irq_attach(NUC_IRQ_RESERVED, nuc_reserved);
#endif
nuc_dumpnvic("initial", NR_IRQS);
#ifndef CONFIG_SUPPRESS_INTERRUPTS
/* And finally, enable interrupts */
irqenable();
#endif
}
void up_disable_irq(int irq)
{
DEBUGASSERT((unsigned)irq < NR_IRQS);
/* Check for an external interrupt */
if (irq >= NUC_IRQ_INTERRUPT && irq < NUC_IRQ_INTERRUPT + 32)
{
/* Set the appropriate bit in the ICER register to disable the
* interrupt
*/
putreg32((1 << (irq - NUC_IRQ_INTERRUPT)), ARMV6M_NVIC_ICER);
}
/* Handle processor exceptions. Only SysTick can be disabled */
else if (irq == NUC_IRQ_SYSTICK)
{
modifyreg32(ARMV6M_SYSTICK_CSR, SYSTICK_CSR_ENABLE, 0);
}
nuc_dumpnvic("disable", irq);
}