SDIO and 50MHz ?
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‎2014-04-11 11:14 PM
Posted on April 12, 2014 at 08:14
Guys,
Why can't I use 50MHz for SDIO ? GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; it worked only with 10MHz GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
1.
/*!< Configure PC.08, PC.09, PC.10, PC.11, PC.12 pin: D0, D1, D2, D3, CLK pin */
2.
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11 | GPIO_Pin_12;
3.
//GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
4.
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
5.
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
6.
GPIO_Init(GPIOC, &GPIO_InitStructure);
Any ideas ?
thanks
2 REPLIES 2
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‎2014-04-12 4:57 AM
Posted on April 12, 2014 at 13:57
How do you have this wired up? And how long are the wires?
I connected my socket with 33K pull-ups, and wires around 25mm (2.5 cm, 1'') long. What do the signals look like on the scope? Do you observe any cross-talk, ringing, etc? What's the clock rate being used (on the bus, not the pin driver slew rate setting)?
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‎2014-04-12 5:59 AM
Posted on April 12, 2014 at 14:59
my wire is 20cm and 10K pull up?...
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