Update sd.c
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@ -380,7 +380,7 @@ rt_err_t mmcsd_send_app_op_cond(struct rt_mmcsd_host *host,
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cmd.arg = ocr;
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cmd.flags = RESP_SPI_R1 | RESP_R3 | CMD_BCR;
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for (i = 100; i; i--)
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for (i = 1000; i; i--)
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{
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err = mmcsd_send_app_cmd(host, RT_NULL, &cmd, 3);
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if (err)
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