arm_cm4.c关于kinetis的修改

xing_chang

于 2013-08-05 14:05:35 发布

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分类专栏： Cortex-M4 C/C++ 文章标签： kinetis 中断 cortex-m4

本文链接：https://blog.youkuaiyun.com/xing_chang/article/details/9766901

针对Kinetis微控制器的特性，需要在arm_cm4.c文件中调整中断设置。原始代码NVIC |= 1<<(irq%32) 改为 NVIC = 1<<(irq%32)，以确保在处理连续中断时不会清除先前的配置。

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