arm_cm4.c关于kinetis的修改

/***********************************************************************/
/*
 * 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);