/***********************************************************************/
/*
* Initialize the NVIC to enable the specified IRQ.
*
* NOTE: The function only initializes the NVIC to enable a single IRQ.
* Interrupts will also need to be enabled in the ARM core. This can be
* done using the EnableInterrupts macro.
*
* Parameters:
* irq irq number to be enabled (the irq number NOT the vector number)
*/
void enable_irq (int irq)
{
int div;
/* Make sure that the IRQ is an allowable number. Right now up to 91 is
* used.
*/
if (irq > 91)
printf("\nERR! Invalid IRQ value passed to enable irq function!\n");
/* Determine which of the NVICISERs corresponds to the irq */
div = irq/32;
switch (div)
{
case 0x0:
NVICICPR0 = 1 << (irq%32);
NVICISER0 = 1 << (irq%32);
break;
case 0x1:
NVICICPR1 = 1 << (irq%32);