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tornado/fw/mmc-hw.c (mmc_activate): allow card to "pre-charge" (Ben needs this)

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This commit is contained in:
Werner Almesberger 2012-12-05 10:35:27 -03:00
parent f449308cc5
commit c9e36f90a2
1 changed files with 4 additions and 0 deletions
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4
tornado/fw/mmc-hw.c
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@ -104,10 +104,14 @@ void mmc_activate(void)
SET(MMC_nCS); SET(MMC_nCS);
CLR(MMC_CLK); CLR(MMC_CLK);
OUT(MMC_nCS); OUT(MMC_nCS);
SET(MMC_MOSI);
SET(MMC_CLK); /* for pre-charging */
OUT(MMC_MOSI); OUT(MMC_MOSI);
OUT(MMC_CLK); OUT(MMC_CLK);
IN(MMC_MISO); IN(MMC_MISO);
_delay_ms(100); /* allow card to pre-charge, to limit inrush current */
CLR(CARD_nPWR); CLR(CARD_nPWR);
_delay_ms(10); _delay_ms(10);