Merge pull request #4608 from majianjia/master
Add more trys when switching MMC card data width
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commit
1916135b89
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@ -300,7 +300,7 @@ static int mmc_select_bus_width(struct rt_mmcsd_card *card, rt_uint8_t *ext_csd)
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MMCSD_BUS_WIDTH_1
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MMCSD_BUS_WIDTH_1
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};
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};
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struct rt_mmcsd_host *host = card->host;
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struct rt_mmcsd_host *host = card->host;
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unsigned idx, bus_width = 0;
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unsigned idx, trys, bus_width = 0;
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int err = 0;
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int err = 0;
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if (GET_BITS(card->resp_cid, 122, 4) < 4)
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if (GET_BITS(card->resp_cid, 122, 4) < 4)
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@ -335,10 +335,13 @@ static int mmc_select_bus_width(struct rt_mmcsd_card *card, rt_uint8_t *ext_csd)
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if (err)
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if (err)
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continue;
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continue;
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bus_width = bus_widths[idx];
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for(trys = 0; trys < 5; trys++){
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mmcsd_set_bus_width(host, bus_width);
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mmcsd_set_bus_width(host, bus_width);
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mmcsd_delay_ms(20); //delay 10ms
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mmcsd_delay_ms(10);
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err = mmc_compare_ext_csds(card, ext_csd, bus_width);
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err = mmc_compare_ext_csds(card, ext_csd, bus_width);
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if(!err)
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break;
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}
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if (!err) {
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if (!err) {
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err = bus_width;
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err = bus_width;
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break;
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break;
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