/***********************************************************************/
/*
* 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