[问答]

am335x通过gpmc和FPGA连接，采用同步模式，为什么FPGA端检测不到同步时钟？（可以读数据）

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问答对人有帮助，内容完整，我也想知道答案 0 这是我的引脚配置，麻烦大家帮忙看下 // module pin mux for gpmc static struct pinmux_config gpmc_pin_mux[]=[ ["gpmc_a1.gpmc_a1", OMAP_MUX_MODE0 \| AM33XX_PIN_OUTPUT \| AM33XX_PULL_DISA], ["gpmc_a2.gpmc_a2", OMAP_MUX_MODE0 \| AM33XX_PIN_OUTPUT \| AM33XX_PULL_DISA], ["gpmc_a3.gpmc_a3", OMAP_MUX_MODE0 \| AM33XX_PIN_OUTPUT \| AM33XX_PULL_DISA], ["gpmc_a4.gpmc_a4", OMAP_MUX_MODE0 \| AM33XX_PIN_OUTPUT \| AM33XX_PULL_DISA], ["gpmc_a5.gpmc_a5", OMAP_MUX_MODE0 \| AM33XX_PIN_OUTPUT \| AM33XX_PULL_DISA], ["gpmc_a6.gpmc_a6", OMAP_MUX_MODE0 \| AM33XX_PIN_OUTPUT \| AM33XX_PULL_DISA], ["gpmc_a7.gpmc_a7", OMAP_MUX_MODE0 \| AM33XX_PIN_OUTPUT \| AM33XX_PULL_DISA], ["gpmc_a8.gpmc_a8", OMAP_MUX_MODE0 \| AM33XX_PIN_OUTPUT \| AM33XX_PULL_DISA], ["gpmc_ad0.gpmc_ad0", OMAP_MUX_MODE0 \| AM33XX_PIN_INPUT_PULLUP], ["gpmc_ad1.gpmc_ad1", OMAP_MUX_MODE0 \| AM33XX_PIN_INPUT_PULLUP], ["gpmc_ad2.gpmc_ad2", OMAP_MUX_MODE0 \| AM33XX_PIN_INPUT_PULLUP], ["gpmc_ad3.gpmc_ad3", OMAP_MUX_MODE0 \| AM33XX_PIN_INPUT_PULLUP], ["gpmc_ad4.gpmc_ad4", OMAP_MUX_MODE0 \| AM33XX_PIN_INPUT_PULLUP], ["gpmc_ad5.gpmc_ad5", OMAP_MUX_MODE0 \| AM33XX_PIN_INPUT_PULLUP], ["gpmc_ad6.gpmc_ad6", OMAP_MUX_MODE0 \| AM33XX_PIN_INPUT_PULLUP], ["gpmc_ad7.gpmc_ad7", OMAP_MUX_MODE0 \| AM33XX_PIN_INPUT_PULLUP], ["gpmc_ad8.gpmc_ad8", OMAP_MUX_MODE0 \| AM33XX_PIN_INPUT_PULLUP], ["gpmc_ad9.gpmc_ad9", OMAP_MUX_MODE0 \| AM33XX_PIN_INPUT_PULLUP], ["gpmc_ad10.gpmc_ad10", OMAP_MUX_MODE0 \| AM33XX_PIN_INPUT_PULLUP], ["gpmc_ad11.gpmc_ad11", OMAP_MUX_MODE0 \| AM33XX_PIN_INPUT_PULLUP], ["gpmc_ad12.gpmc_ad12", OMAP_MUX_MODE0 \| AM33XX_PIN_INPUT_PULLUP], ["gpmc_ad13.gpmc_ad13", OMAP_MUX_MODE0 \| AM33XX_PIN_INPUT_PULLUP], ["gpmc_ad14.gpmc_ad14", OMAP_MUX_MODE0 \| AM33XX_PIN_INPUT_PULLUP], ["gpmc_ad15.gpmc_ad15", OMAP_MUX_MODE0 \| AM33XX_PIN_INPUT_PULLUP], ["gpmc_advn_ale.gpmc_advn_ale", OMAP_MUX_MODE0 \| AM33XX_PULL_DISA], ["gpmc_oen_ren.gpmc_oen_ren", OMAP_MUX_MODE0 \| AM33XX_PULL_DISA], ["gpmc_wen.gpmc_wen", OMAP_MUX_MODE0 \| AM33XX_PULL_DISA], ["gpmc_ben0_cle.gpmc_ben0_cle", OMAP_MUX_MODE0 \| AM33XX_PULL_DISA], ["gpmc_wpn.gpmc_wpn", OMAP_MUX_MODE7 \| AM33XX_PIN_INPUT_PULLUP], ["gpmc_clk.gpmc_wait1", OMAP_MUX_MODE2 \| AM33XX_PIN_INPUT_PULLUP], //["gpmc_clk.gpmc_clk", OMAP_MUX_MODE0 \| AM33XX_PIN_INPUT_PULLUP], /must be set as an input/ ["gpmc_csn1.gpmc_clk", OMAP_MUX_MODE1 \| AM33XX_PIN_INPUT_PULLUP], //["gpmc_csn1.gpmc_csn1", OMAP_MUX_MODE0 \| AM33XX_PULL_DISA], //["gpmc_csn2.gpmc_csn2", OMAP_MUX_MODE0 \| AM33XX_PULL_DISA], ["gpmc_csn3.gpmc_csn3", OMAP_MUX_MODE0 \| AM33XX_PULL_DISA], [NULL, 0], ]; 会不会是时钟引脚属性设置错了，多谢！ 0
2018-6-1 04:31:05　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × 普罗旺斯的薰衣草该类别下有 49 个回答。邀请回答新星之火12138 该类别下有 49 个回答。邀请回答 heks 该类别下有 47 个回答。邀请回答 lksas 该类别下有 39 个回答。邀请回答潘涛12345 该类别下有 39 个回答。邀请回答 wang21cj 该类别下有 38 个回答。邀请回答 fdhsfagd 该类别下有 38 个回答。邀请回答霍威电源该类别下有 36 个回答。邀请回答 chm5 该类别下有 36 个回答。邀请回答站着幻想该类别下有 35 个回答。邀请回答 hgimtk 该类别下有 35 个回答。邀请回答 ggfx 该类别下有 35 个回答。邀请回答 kingnet6688 该类别下有 35 个回答。邀请回答 wanglinhua2627 该类别下有 35 个回答。邀请回答 huzp_bbs 该类别下有 34 个回答。邀请回答 lifei639156 该类别下有 34 个回答，其中被选为最佳答案 1 次。邀请回答 HengDu 该类别下有 34 个回答。邀请回答 msvdsufsdf 该类别下有 34 个回答。邀请回答 kghfh 该类别下有 33 个回答。邀请回答 K_Ming 该类别下有 32 个回答。邀请回答举报李建宁相关推荐 • 找兼职 beaglebone black(am335x) 通过GPMC管脚实现与FPGA的通信 4077 • am335x的gpmc和edma问题，请问为什么我的板子上的am335x只有A[10：0]的地址线可控制，A11以上的输出有问题呢？ 3234 • AM335X FPGA 中断管理 2403 • 請問am335x對外部FPGA介面都是透過EMIFAM335X是用EMIF or GPMC? 2420 • GPMC与FPGA通讯同步模式写成功，读不到数据 3391 • SPI速度问题 5975 • am335x的GPMC驱动问题 4187 • 实现一个gpmc与nandflash芯片通讯和一个gpmc与FPGA模拟的nandflash通讯 3080 • 请问AM335X nor flash启动设计应该注意什么？ 2488 • AM335X GPMC连接NANDFLASH 的疑问 4287 20个回答

答案对人有帮助，有参考价值 0 hongjane 发表于 2018-6-1 08:40 再次感谢回复！请问config_1的地址是多少，如果要用devmem2打印的话 GPMC片选0设备的config1寄存器地址是：0x50000060。得到方法：从TRM的第二章memory map，找到GPMC的基址，0x5000 0000；然后在GPMC章节，看GPMC_CONFIG1_0的地址，这个地址是偏移量，为0x60，加在一起就是0x5000 0060.

2018-6-1 08:52:41 评论举报吴思莹