Reading the Jz4720 chip, I can see that all GPIOs have an internal Pull-up resistor enabled at reset.
So, We need probe some Resistor values, if with a 330 resistor from KIN3 to GROUND the processor enter in USB mode, you can try with 2k, 10k, etc
Carlos
Hi
I'm testing in my board some resistors, with 1.8k form GND to Bootsel1 and a pull up 47k resistor the processor can enter to usb mode. So, I think that the problem is with the GPIO value at reset.
On Thu, Aug 27, 2009 at 10:03 AM, Carlos Camargo <cicamargoba@gmail.com> wrote:With the 330 resistor, the CPU enter in USB mode?On Thu, Aug 27, 2009 at 9:29 AM, Adam Wang <adam@qi-hardware.com> wrote:
Hi Carlos,Still enter NAND boot mode.
This board have a Reset S1, What happen when you press the U key and push the reset?
Does cpu work on those KEYOUT1~7 and KEYIN1~7 as default "high" status before it starts to run codes to initial those pins, no matter either nand or usb?
sorry, I don't know
Adam
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Carlos
--
Carlos Iván Camargo Bareño
Profesor Asistente
Departamento de Ingeniería Eléctrica y Electrónica
Universidad Nacional de Colombia
cicamargoba@unal.edu.co
--
Carlos Iván Camargo Bareño
Profesor Asistente
Departamento de Ingeniería Eléctrica y Electrónica
Universidad Nacional de Colombia
cicamargoba@unal.edu.co