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    SPI四线寄存器设置不进去

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    • C
      chenlinfei LV 5 last edited by

      问题描述

      在u-boot代码中设置SPI BCC寄存器,发现BIT[29]设置进去后会丢失。

      源代码

      printf("1 ????????????????????????????????????????????????? %x\n", get_reg(SPI_BCC));
      printf("2 ????????????????????????????????????????????????? %x\n", get_reg(SPI_BCC));
      printf("3 ????????????????????????????????????????????????? %x\n", get_reg(SPI_BCC));
                              set_reg(SPI_BCC, get_reg(SPI_BCC) | (1 << 29));
      
      printf("4 ????????????????????????????????????????????????? %x\n", get_reg(SPI_BCC));
      printf("5 ????????????????????????????????????????????????? %x\n", get_reg(SPI_BCC));
      
                              rx_dma_flag = 1;
                              set_reg(SPI_FCR, (get_reg(SPI_FCR) | SPI_RXDMAREQ_EN));
      
                              spic0_dma_start(0, (unsigned long) rxbuf, rcnt);
                      }
              }
      
      "drivers/mtd/awnand/spinand/physic/spic_op.c" 693L, 16039C written                                                              595,4-25      85%
      

      LOG打印

      1 ????????????????????????????????????????????????? 1
      2 ????????????????????????????????????????????????? 0
      3 ????????????????????????????????????????????????? 0
      4 ????????????????????????????????????????????????? 20000000
      5 ????????????????????????????????????????????????? 0
      
      xiaowenge 1 Reply Last reply Reply Quote Share 0
      • U
        uuuuid LV 5 last edited by

        奇怪,怎么都是都是问号?

        xiaowenge 1 Reply Last reply Reply Quote Share 0
        • xiaowenge
          DOT小文哥 LV 7 @uuuuid last edited by

          @uuuuid 在 SPI四线寄存器设置不进去 中说:

          奇怪,怎么都是都是问号?

          这个是资金打印的标识吧,方便找到log

          1 Reply Last reply Reply Quote Share 0
          • xiaowenge
            DOT小文哥 LV 7 @chenlinfei last edited by

            @chenlinfei
            做这个修改并把下面的那个选项配置上试一下
            6946ce6e-f430-4169-8a64-b4323094ba67-image.png
            7d94e03a-699b-4872-ae06-a6b673ba46da-image.png

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