On 10/10/13 21:58, Lars-Peter Clausen wrote: > According to the datasheet the the panel as a dedicated dout pin. Maybe > you did not connect it in your design, which means you won't be able to > read any data from the panel at all. I don't see a dedicated dout in the datasheet... http://dl.wolfgang-draxinger.net/openmoko/doc/TD028TTEC1.pdf > Also your custom bitbang code looks a bit strange: > > gpio_set_value(data->dout_gpio, 1); > if (gpio_get_value(data->din_gpio) == 0) > return 1; > > You set the state on the dout pin and then read the din pin, if both do > not match you abort with an error. This suggest that, for whatever > reason, you feed the dout pin back into the din pin in your design. Btw. > this is also the only place where din is used in your driver. Yes, he said the single "Serial interface data input/output" pin is connected to both din and dout on the SoC. I guess the purpose of that gpio_get_value() is to ensure that the panel is not pulling the line when the SoC is writing to it. Not that I really understand how that can work, but I'm not a HW guy =). Tomi
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