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);
              NVICISER1 = 1 << (irq%32);
              break;
    	case 0x2:
              NVICICPR2 = 1 << (irq%32);
              NVICISER2 = 1 << (irq%32);
              break;
    }
}
/***********************************************************************/
/*
 * Initialize the NVIC to disable the specified IRQ.
 *
 * NOTE: The function only initializes the NVIC to disable a single IRQ.
 * If you want to disable all interrupts, then use the DisableInterrupts
 * macro instead.
 *
 * Parameters:
 * irq    irq number to be disabled (the irq number NOT the vector number)
 */

void disable_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 disable irq function!\n");

    /* Determine which of the NVICICERs corresponds to the irq */
    div = irq/32;

    switch (div)
    {
    	case 0x0:
               NVICICER0 = 1 << (irq%32);
              break;
    	case 0x1:
              NVICICER1 = 1 << (irq%32);
              break;
    	case 0x2:
              NVICICER2 = 1 << (irq%32);
              break;
    }
}

由于kinetis的寄存器的特殊性 ，arm_cm4.c文件中作相应修改如下：

NVIC？？？？|= 1<<(irq%32)  改为 NVIC？？？？= 1<<(irq%32)

不然第二次操作中断，会清除第一次的设置