问题：
在合计智能穿戴应用的时候，为了更好的用户体验和丰富的人机交互界面，需要更多的存储(RAM 和 FLASH)来存储自定义的图片资源 ;由于可穿戴类的产品体积都非常小，因此 FLASH&PSRAM集成在一起的 MCP 存储芯片是一个不错的选择.
我们的 STM32 FMC 外设是可以支持 MCP 存储芯片的，而且只需要简单的配置就可以实现MCP 的访问.


调研:
下面介绍使用 STM32CubeMX 配置 MCP 驱动的过程,我们使用 STM32F429+MX69V28F64 举例说明:

一、配置过程:
1.MX69V28F64 的总线结构和 PIN 定义:





2.下面我们使用 STM32CubeMX 来配置 MCP 接口:
a.新建 STM32F429ZIYx 的工程，在 FMC 根据 MCP 芯片来配置 FMC 的参数：



b.在 configuration 选项卡中配置 FMC 的详细参数,



c.根据 MX69V28F64 datasheet 中对时间的要求来更改 NOR/PSRAM timing 的参数:



c.配置完成后，生成代码，FMC 主要初始化如下:

1. /* FMC initialization function */
   
2. void MX_FMC_Init(void)
   
3. {
   
4. FMC_NORSRAM_TimingTypeDef Timing;
   
5. /** Perform the SRAM1 memory initialization sequence
   
6. */
   
7. hsram1.Instance = FMC_NORSRAM_DEVICE;
   
8. hsram1.Extended = FMC_NORSRAM_EXTENDED_DEVICE;
   
9. /* hsram1.Init */
   
10. hsram1.Init.NSBank = FMC_NORSRAM_BANK1;
    
11. hsram1.Init.DataAddressMux = FMC_DATA_ADDRESS_MUX_ENABLE;
    
12. hsram1.Init.MemoryType = FMC_MEMORY_TYPE_PSRAM;
    
13. hsram1.Init.MemoryDataWidth = FMC_NORSRAM_MEM_BUS_WIDTH_16;
    
14. hsram1.Init.BurstAccessMode = FMC_BURST_ACCESS_MODE_DISABLE;
    
15. hsram1.Init.WaitSignalPolarity = FMC_WAIT_SIGNAL_POLARITY_HIGH;
    
16. hsram1.Init.WrapMode = FMC_WRAP_MODE_DISABLE;
    
17. hsram1.Init.WaitSignalActive = FMC_WAIT_TIMING_BEFORE_WS;
    
18. hsram1.Init.WriteOperation = FMC_WRITE_OPERATION_DISABLE;
    
19. hsram1.Init.WaitSignal = FMC_WAIT_SIGNAL_DISABLE;
    
20. hsram1.Init.ExtendedMode = FMC_EXTENDED_MODE_DISABLE;
    
21. hsram1.Init.AsynchronousWait = FMC_ASYNCHRONOUS_WAIT_ENABLE;
    
22. hsram1.Init.WriteBurst = FMC_WRITE_BURST_DISABLE;
    
23. hsram1.Init.ContinuousClock = FMC_CONTINUOUS_CLOCK_SYNC_ONLY;
    
24. /* Timing */
    
25. Timing.AddressSetupTime = 2;
    
26. Timing.AddressHoldTime = 2;
    
27. Timing.DataSetupTime = 6;
    
28. Timing.BusTurnAroundDuration = 0;
    
29. Timing.CLKDivision = 16;
    
30. Timing.DataLatency = 17;
    
31. Timing.AccessMode = FMC_ACCESS_MODE_A;
    
32. /* ExtTiming */
    
33. HAL_SRAM_Init(&hsram1, &Timing, NULL);
    
34. /** Perform the NOR2 memory initialization sequence
    
35. */
    
36. hnor2.Instance = FMC_NORSRAM_DEVICE;
    
37. hnor2.Extended = FMC_NORSRAM_EXTENDED_DEVICE;
    
38. /* hnor2.Init */
    
39. hnor2.Init.NSBank = FMC_NORSRAM_BANK2;
    
40. hnor2.Init.DataAddressMux = FMC_DATA_ADDRESS_MUX_ENABLE;
    
41. hnor2.Init.MemoryType = FMC_MEMORY_TYPE_NOR;
    
42. hnor2.Init.MemoryDataWidth = FMC_NORSRAM_MEM_BUS_WIDTH_16;
    
43. hnor2.Init.BurstAccessMode = FMC_BURST_ACCESS_MODE_DISABLE;
    
44. hnor2.Init.WaitSignalPolarity = FMC_WAIT_SIGNAL_POLARITY_LOW;
    
45. hnor2.Init.WrapMode = FMC_WRAP_MODE_DISABLE;
    
46. hnor2.Init.WaitSignalActive = FMC_WAIT_TIMING_BEFORE_WS;
    
47. hnor2.Init.WriteOperation = FMC_WRITE_OPERATION_DISABLE;
    
48. hnor2.Init.WaitSignal = FMC_WAIT_SIGNAL_DISABLE;
    
49. hnor2.Init.ExtendedMode = FMC_EXTENDED_MODE_DISABLE;
    
50. hnor2.Init.AsynchronousWait = FMC_ASYNCHRONOUS_WAIT_DISABLE;
    
51. hnor2.Init.WriteBurst = FMC_WRITE_BURST_DISABLE;
    
52. hnor2.Init.ContinuousClock = FMC_CONTINUOUS_CLOCK_SYNC_ONLY;
    
53. /* Timing */
    
54. Timing.AddressSetupTime = 5;
    
55. Timing.AddressHoldTime = 15;
    
56. Timing.DataSetupTime = 7;
    
57. Timing.BusTurnAroundDuration = 2;
    
58. Timing.CLKDivision = 16;
    
59. Timing.DataLatency = 17;
    
60. Timing.AccessMode = FMC_ACCESS_MODE_A;
    
61. /* ExtTiming */
    
62. HAL_NOR_Init(&hnor2, &Timing, NULL);
    
63. }

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二、软件如何使用:
用户在编写软件的时候，直接访问 FMC Bank1 的分区地址即可,FMC 外设会生成读写MCP 芯片的时序.