STM32H7 FD CAN中消息RAM在CAN1和CAN2上合理分配方法

eric2013

CMSIS-Driver提供的分配方式非常好，还可以方便的检查是否溢出。
CAN1和CAN2共享2560个字。




CAN1:

1. // CAN1 controller configuration ------
   
2. 
   
3. #ifndef CAN1_RX_FIFO0_ELEM_NUM
   
4. #define CAN1_RX_FIFO0_ELEM_NUM          (8U)
   
5. #endif
   
6. #if    (CAN1_RX_FIFO0_ELEM_NUM > 64U)
   
7. #error  Too many Receive FIFO0 Elements defined for CAN1, maximum number of Receive FIFO0 Elements is 64 !!!
   
8. #endif
   
9. 
   
10. #ifndef CAN1_RX_FIFO1_ELEM_NUM
    
11. #define CAN1_RX_FIFO1_ELEM_NUM          (8U)
    
12. #endif
    
13. #if    (CAN1_RX_FIFO1_ELEM_NUM > 64U)
    
14. #error  Too many Receive FIFO1 Elements defined for CAN1, maximum number of Receive FIFO1 Elements is 64 !!!
    
15. #endif
    
16. 
    
17. #ifndef CAN1_RX_BUF_NUM
    
18. #define CAN1_RX_BUF_NUM                 (16U)
    
19. #endif
    
20. #if    (CAN1_RX_BUF_NUM > 64U)
    
21. #error  Too many Receive Buffers defined for CAN1, maximum number of Receive Buffers is 64 !!!
    
22. #endif
    
23. 
    
24. #ifndef CAN1_TX_FIFO_ELEM_NUM
    
25. #define CAN1_TX_FIFO_ELEM_NUM           (8U)
    
26. #endif
    
27. #if    (CAN1_TX_FIFO_ELEM_NUM > 32U)
    
28. #error  Too many Transmit FIFO Elements defined for CAN1, maximum number of Transmit FIFO Elements is 32 !!!
    
29. #endif
    
30. 
    
31. #ifndef CAN1_TX_BUF_NUM
    
32. #define CAN1_TX_BUF_NUM                 (16U)
    
33. #endif
    
34. #if    (CAN1_TX_BUF_NUM > 32U)
    
35. #error  Too many Transmit Buffers defined for CAN1, maximum number of Transmit Buffers is 32 !!!
    
36. #endif
    
37. 
    
38. #if    ((CAN1_TX_FIFO_ELEM_NUM + CAN1_TX_BUF_NUM) > 32U)
    
39. #error  Too many Transmit Elements and Buffers defined for CAN1, maximum number of Transmit Elements and Buffers together is 32 !!!
    
40. #endif
    
41. 
    
42. #ifndef CAN1_FILTER_STD_NUM
    
43. #define CAN1_FILTER_STD_NUM             (128U)
    
44. #endif
    
45. #if    (CAN1_FILTER_STD_NUM > 128U)
    
46. #error  Standard Filter Elements defined for CAN1, maximum number of Standard Filter Elements is 128 !!!
    
47. #endif
    
48. 
    
49. #ifndef CAN1_FILTER_EXT_NUM
    
50. #define CAN1_FILTER_EXT_NUM             (64U)
    
51. #endif
    
52. #if    (CAN1_FILTER_EXT_NUM > 64U)
    
53. #error  Extended Filter Elements defined for CAN1, maximum number of Extended Filter Elements is 64 !!!
    
54. #endif
    
55. 
    
56. #define CAN1_RX_FIFO_EN                ((CAN1_RX_FIFO0_ELEM_NUM != 0U) || (CAN1_RX_FIFO1_ELEM_NUM != 0U))
    
57. #define CAN1_RX_BUF_EN                  (CAN1_RX_BUF_NUM        != 0U)
    
58. #define CAN1_TX_FIFO_EN                 (CAN1_TX_FIFO_ELEM_NUM  != 0U)
    
59. #define CAN1_TX_BUF_EN                  (CAN1_TX_BUF_NUM        != 0U)
    
60. #define CAN1_RX_FIFO_OBJ_NUM           ((CAN1_RX_FIFO0_ELEM_NUM != 0U) + (CAN1_RX_FIFO1_ELEM_NUM != 0U))
    
61. #define CAN1_RX_BUF_OBJ_NUM             (CAN1_RX_BUF_NUM)
    
62. #define CAN1_RX_TOT_OBJ_NUM             (CAN1_RX_FIFO_OBJ_NUM + CAN1_RX_BUF_OBJ_NUM)
    
63. #define CAN1_TX_FIFO_OBJ_NUM           ((CAN1_TX_FIFO_ELEM_NUM  != 0U))
    
64. #define CAN1_TX_BUF_OBJ_NUM             (CAN1_TX_BUF_NUM)
    
65. #define CAN1_TX_TOT_OBJ_NUM             (CAN1_TX_FIFO_OBJ_NUM + CAN1_TX_BUF_OBJ_NUM)
    
66. #define CAN1_TOT_OBJ_NUM                (CAN1_RX_TOT_OBJ_NUM  + CAN1_TX_TOT_OBJ_NUM)
    
67. #define CAN1_TOT_ELEM_NUM               (CAN1_RX_FIFO0_ELEM_NUM + CAN1_RX_FIFO1_ELEM_NUM + CAN1_RX_BUF_NUM + CAN1_TX_BUF_NUM)
    
68. 
    
69. #define CAN1_RAM_OFS_STD_ID             (0U)
    
70. #define CAN1_RAM_OFS_EXT_ID             (CAN1_RAM_OFS_STD_ID        +   CAN1_FILTER_STD_NUM)
    
71. #define CAN1_RAM_OFS_RX_FIFO0           (CAN1_RAM_OFS_EXT_ID        +  (CAN1_FILTER_EXT_NUM    * 2U))
    
72. #define CAN1_RAM_OFS_RX_FIFO1           (CAN1_RAM_OFS_RX_FIFO0      +  (CAN1_RX_FIFO0_ELEM_NUM * 18U))
    
73. #define CAN1_RAM_OFS_RX_BUFFER          (CAN1_RAM_OFS_RX_FIFO1      +  (CAN1_RX_FIFO1_ELEM_NUM * 18U))
    
74. #define CAN1_RAM_OFS_TX_EVENT_FIFO      (CAN1_RAM_OFS_RX_BUFFER     +  (CAN1_RX_BUF_NUM        * 18U))
    
75. #define CAN1_RAM_OFS_TX_BUFFER          (CAN1_RAM_OFS_TX_EVENT_FIFO +  (CAN1_TX_FIFO_ELEM_NUM  * 2U))
    
76. #define CAN1_TOT_RAM                    (CAN1_RAM_OFS_TX_BUFFER     + ((CAN1_TX_FIFO_ELEM_NUM  + CAN1_RX_BUF_OBJ_NUM) * 18U))
    

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CAN2:

1. #ifndef CAN2_RX_FIFO0_ELEM_NUM
   
2. #define CAN2_RX_FIFO0_ELEM_NUM          (8U)
   
3. #endif
   
4. #if    (CAN2_RX_FIFO0_ELEM_NUM > 64U)
   
5. #error  Too many Receive FIFO0 Elements defined for CAN2, maximum number of Receive FIFO0 Elements is 64 !!!
   
6. #endif
   
7. 
   
8. #ifndef CAN2_RX_FIFO1_ELEM_NUM
   
9. #define CAN2_RX_FIFO1_ELEM_NUM          (8U)
   
10. #endif
    
11. #if    (CAN2_RX_FIFO1_ELEM_NUM > 64U)
    
12. #error  Too many Receive FIFO1 Elements defined for CAN2, maximum number of Receive FIFO1 Elements is 64 !!!
    
13. #endif
    
14. 
    
15. #ifndef CAN2_RX_BUF_NUM
    
16. #define CAN2_RX_BUF_NUM                 (16U)
    
17. #endif
    
18. #if    (CAN2_RX_BUF_NUM > 64U)
    
19. #error  Too many Receive Buffers defined for CAN2, maximum number of Receive Buffers is 64 !!!
    
20. #endif
    
21. 
    
22. #ifndef CAN2_TX_FIFO_ELEM_NUM
    
23. #define CAN2_TX_FIFO_ELEM_NUM           (8U)
    
24. #endif
    
25. #if    (CAN2_TX_FIFO_ELEM_NUM > 32U)
    
26. #error  Too many Transmit FIFO Elements defined for CAN2, maximum number of Transmit FIFO Elements is 32 !!!
    
27. #endif
    
28. 
    
29. #ifndef CAN2_TX_BUF_NUM
    
30. #define CAN2_TX_BUF_NUM                 (16U)
    
31. #endif
    
32. #if    (CAN2_TX_BUF_NUM > 32U)
    
33. #error  Too many Transmit Buffers defined for CAN2, maximum number of Transmit Buffers is 32 !!!
    
34. #endif
    
35. 
    
36. #if    ((CAN2_TX_FIFO_ELEM_NUM + CAN2_TX_BUF_NUM) > 32U)
    
37. #error  Too many Transmit Elements and Buffers defined for CAN2, maximum number of Transmit Elements and Buffers together is 32 !!!
    
38. #endif
    
39. 
    
40. #ifndef CAN2_FILTER_STD_NUM
    
41. #define CAN2_FILTER_STD_NUM             (128U)
    
42. #endif
    
43. #if    (CAN2_FILTER_STD_NUM > 128U)
    
44. #error  Standard Filter Elements defined for CAN2, maximum number of Standard Filter Elements is 128 !!!
    
45. #endif
    
46. 
    
47. #ifndef CAN2_FILTER_EXT_NUM
    
48. #define CAN2_FILTER_EXT_NUM             (64U)
    
49. #endif
    
50. #if    (CAN2_FILTER_EXT_NUM > 64U)
    
51. #error  Extended Filter Elements defined for CAN2, maximum number of Extended Filter Elements is 64 !!!
    
52. #endif
    
53. 
    
54. #define CAN2_RX_FIFO_EN                ((CAN2_RX_FIFO0_ELEM_NUM != 0U) || (CAN2_RX_FIFO1_ELEM_NUM != 0U))
    
55. #define CAN2_RX_BUF_EN                  (CAN2_RX_BUF_NUM        != 0U)
    
56. #define CAN2_TX_FIFO_EN                 (CAN2_TX_FIFO_ELEM_NUM  != 0U)
    
57. #define CAN2_TX_BUF_EN                  (CAN2_TX_BUF_NUM        != 0U)
    
58. #define CAN2_RX_FIFO_OBJ_NUM           ((CAN2_RX_FIFO0_ELEM_NUM != 0U) + (CAN2_RX_FIFO1_ELEM_NUM != 0U))
    
59. #define CAN2_RX_BUF_OBJ_NUM             (CAN2_RX_BUF_NUM)
    
60. #define CAN2_RX_TOT_OBJ_NUM             (CAN2_RX_FIFO_OBJ_NUM + CAN2_RX_BUF_OBJ_NUM)
    
61. #define CAN2_TX_FIFO_OBJ_NUM           ((CAN2_TX_FIFO_ELEM_NUM  != 0U))
    
62. #define CAN2_TX_BUF_OBJ_NUM             (CAN2_TX_BUF_NUM)
    
63. #define CAN2_TX_TOT_OBJ_NUM             (CAN2_TX_FIFO_OBJ_NUM + CAN2_TX_BUF_OBJ_NUM)
    
64. #define CAN2_TOT_OBJ_NUM                (CAN2_RX_TOT_OBJ_NUM  + CAN2_TX_TOT_OBJ_NUM)
    
65. #define CAN2_TOT_ELEM_NUM               (CAN2_RX_FIFO0_ELEM_NUM + CAN2_RX_FIFO1_ELEM_NUM + CAN2_RX_BUF_NUM + CAN2_TX_BUF_NUM)
    
66. 
    
67. #define CAN2_RAM_OFS_STD_ID             (0U)
    
68. #define CAN2_RAM_OFS_EXT_ID             (CAN2_RAM_OFS_STD_ID        +   CAN2_FILTER_STD_NUM)
    
69. #define CAN2_RAM_OFS_RX_FIFO0           (CAN2_RAM_OFS_EXT_ID        +  (CAN2_FILTER_EXT_NUM * 2U))
    
70. #define CAN2_RAM_OFS_RX_FIFO1           (CAN2_RAM_OFS_RX_FIFO0      +  (CAN2_RX_FIFO0_ELEM_NUM * 18U))
    
71. #define CAN2_RAM_OFS_RX_BUFFER          (CAN2_RAM_OFS_RX_FIFO1      +  (CAN2_RX_FIFO1_ELEM_NUM * 18U))
    
72. #define CAN2_RAM_OFS_TX_EVENT_FIFO      (CAN2_RAM_OFS_RX_BUFFER     +  (CAN2_RX_BUF_NUM * 18U))
    
73. #define CAN2_RAM_OFS_TX_BUFFER          (CAN2_RAM_OFS_TX_EVENT_FIFO +  (CAN2_TX_FIFO_ELEM_NUM * 2U))
    
74. #define CAN2_TOT_RAM                    (CAN2_RAM_OFS_TX_BUFFER     + ((CAN2_TX_FIFO_ELEM_NUM + CAN2_RX_BUF_OBJ_NUM) * 18U))

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检查RAM配置是否超了

1. // Check Message RAM configuration
   
2. #if ((CAN1_USED == 1) && (CAN2_USED == 0) && (CAN1_TOT_RAM > 2560U))
   
3.   #error Message RAM contains only 10 kB, current configuration of CAN1 requires more memory, please reduce number of FIFO or buffer elements for Receive or Transmit!
   
4. #endif
   
5. #if ((CAN1_USED == 0) && (CAN2_USED == 1) && (CAN2_TOT_RAM > 2560U))
   
6.   #error Message RAM contains only 10 kB, current configuration of CAN2 requires more memory, please reduce number of FIFO or buffer elements for Receive or Transmit!
   
7. #endif
   
8. #if ((CAN1_USED == 1) && (CAN2_USED == 1) && ((CAN1_TOT_RAM + CAN2_TOT_RAM) > 2560U))
   
9.   #error Message RAM contains only 10 kB, current configuration of CAN1 and CAN2 requires more memory, please reduce number of FIFO or buffer elements for Receive or Transmit!
   
10. #endif
    

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eric2013

#if (CAN1_USED == 1)
// Statically allocated RAM for filters and buffers for CAN1 controller
static uint32_t         CAN1_RAM[CAN1_TOT_RAM] __MEMORY_AT(0x4000AC00);
#endif
#if (CAN2_USED == 1)
// Statically allocated RAM for filters and buffers for CAN2 controller
static uint32_t         CAN2_RAM[CAN2_TOT_RAM] __MEMORY_AT(0x4000C000);
#endif