imx6q saber linux sd卡cd检测脚更改

只看该作者 · 2015-6-24 13:55

哪位哥们能帮忙解决这个问题，sd卡的cd检测，怎么更改，原来好像是个中断，检测上升沿或者下降沿，我想更改cd检测的极性，就是低是不插卡，高时插卡状态，没找到在哪里更改。

只看该作者 · 2015-6-24 14:22

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只看该作者 · 2015-6-24 17:19

board-xxxx.c和board-xxxx.h，xxxx是你用的板子名或者你们copy的哪个板子......

只看该作者 · 2015-6-24 20:33

没有用过这个呢

1万 · 2015-7-10 17:34

楼主你好，请问你帖中问题是否已经解决呢？
非常感谢你关于i.mx 的技术问题。如果你没有其他问题，我们将此帖默认为已解决。
如果没有欢迎继续在这里讨论交流哈~~

只看该作者 · 2015-7-12 21:58

alloy518 发表于 2015-6-24 14:22
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没怎么用过，不太熟悉

只看该作者 · 2015-7-13 09:38

这个得改底下的驱动了吧，好像不太麻烦

只看该作者 · 2015-7-17 13:16

可以参考如下代码（drivers/mmc/host/sdhci-esdhc-imx.c），修改判断 gpio_get_value(boarddata->cd_gpio)的值：

if (unlikely(reg == SDHCI_PRESENT_STATE)) {
if (boarddata && boarddata->always_present)
val |= SDHCI_CARD_PRESENT;
else if (imx_data->flags & ESDHC_FLAG_GPIO_FOR_CD_WP) {
if (boarddata && gpio_is_valid(boarddata->cd_gpio)
&& gpio_get_value(boarddata->cd_gpio))
/* no card, if a valid gpio says so */
val &= ~SDHCI_CARD_PRESENT;
else
/* in all other cases assume card is present */
val |= SDHCI_CARD_PRESENT;
}
}

只看该作者 · 2015-7-21 09:44

暂时没有这么调过，不过看上去，楼上正解......

只看该作者 · 2017-8-21 18:55

您好，请问您是怎么改的？

只看该作者 · 2017-8-21 18:57

iMalody 发表于 2015-7-17 13:16
可以参考如下代码（drivers/mmc/host/sdhci-esdhc-imx.c），修改判断 gpio_get_value(boarddata->cd_gpio) ...

上升沿检测的话，是不是将val&=~SDHCI_CARD_PRESENT;和val |= SDHCI_CARD_PRESENT;调换一下就可以了？

imx6q saber linux sd卡cd检测脚更改

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