SDK中的函数InstallIRQHandler怎么使用？

cancore

在官方SDK中的fsl_common.c文件中发现如下函数，这个跟我们需要把中断向量表拷贝到内部RAM是差不多原理，有人知道怎么使用吗？

1. 
   
2. #ifndef __GIC_PRIO_BITS
   
3. #if defined(ENABLE_RAM_VECTOR_TABLE)
   
4. uint32_t InstallIRQHandler(IRQn_Type irq, uint32_t irqHandler)
   
5. {
   
6. /* Addresses for VECTOR_TABLE and VECTOR_RAM come from the linker file */
   
7. #if defined(__CC_ARM)
   
8. extern uint32_t Image$VECTOR_ROM$Base[];
   
9. extern uint32_t Image$VECTOR_RAM$Base[];
   
10. extern uint32_t Image$RW_m_data$Base[];
    
11. 
    
12. #define __VECTOR_TABLE Image$VECTOR_ROM$Base
    
13. #define __VECTOR_RAM Image$VECTOR_RAM$Base
    
14. #define __RAM_VECTOR_TABLE_SIZE (((uint32_t)Image$RW_m_data$Base - (uint32_t)Image$VECTOR_RAM$Base))
    
15. #elif defined(__ICCARM__)
    
16. extern uint32_t __RAM_VECTOR_TABLE_SIZE[];
    
17. extern uint32_t __VECTOR_TABLE[];
    
18. extern uint32_t __VECTOR_RAM[];
    
19. #elif defined(__GNUC__)
    
20. extern uint32_t __VECTOR_TABLE[];
    
21. extern uint32_t __VECTOR_RAM[];
    
22. extern uint32_t __RAM_VECTOR_TABLE_SIZE_BYTES[];
    
23. uint32_t __RAM_VECTOR_TABLE_SIZE = (uint32_t)(__RAM_VECTOR_TABLE_SIZE_BYTES);
    
24. #endif /* defined(__CC_ARM) */
    
25. uint32_t n;
    
26. uint32_t ret;
    
27. uint32_t irqMaskValue;
    
28. 
    
29. irqMaskValue = DisableGlobalIRQ();
    
30. if (SCB->VTOR != (uint32_t)__VECTOR_RAM)
    
31. {
    
32. /* Copy the vector table from ROM to RAM */
    
33. for (n = 0; n < ((uint32_t)__RAM_VECTOR_TABLE_SIZE) / sizeof(uint32_t); n++)
    
34. {
    
35. __VECTOR_RAM[n] = __VECTOR_TABLE[n];
    
36. }
    
37. /* Point the VTOR to the position of vector table */
    
38. SCB->VTOR = (uint32_t)__VECTOR_RAM;
    
39. }
    
40. 
    
41. ret = __VECTOR_RAM[irq + 16];
    
42. /* make sure the __VECTOR_RAM is noncachable */
    
43. __VECTOR_RAM[irq + 16] = irqHandler;
    
44. 
    
45. EnableGlobalIRQ(irqMaskValue);
    
46. 
    
47. /* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
    
48. exception return operation might vector to incorrect interrupt */
    
49. #if defined __CORTEX_M && (__CORTEX_M == 4U)
    
50. __DSB();
    
51. #endif
    
52. 
    
53. return ret;
    
54. }
    
55. #endif /* ENABLE_RAM_VECTOR_TABLE. */
    
56. #endif /* __GIC_PRIO_BITS. */
    

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南门静美

好高深，帮顶

Brave000

wow,好长的代码。。。。。。钻也帮顶

fire

就是直接用这个涵数更新新的中断涵数，它会先把中断项量表复制到ram