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Last Post 17 Jun 2016 08:52 AM by Adam Ford

Contention when driving mcspi2_cs1

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L DiRuscio

New Member
Posts:44

13 Jun 2016 11:31 AM
I would like to use DM3730 SOM - J1-P51 (mcspi2_cs1) as a GPIO output line. After executing step #7 below, the GPIO line does not pull up to 1.8V (only gets to abut 0.2v). I believe I am talking to the correct GPIO because I can see it drop to 0V when setting to logic '0', or this loaded state when writing logic '1' I did the following procedure per LogicPD app note AN 527(selecting and using gpio signals on DM3730) : 1) grep gpio_182 /debug/omap_mux/* /debug/omap_mux/mcspi2_cs1:signals: mcspi2_cs1 \| gpt8_pwm_evt \| hsusb2_tll_data3 \| hsusb2_data3 \| gpio_182 \| mm2_txen_n \| NA \| safe_mode 2) cat /debug/omap_mux/mcspi2_cs1 name: mcspi2_cs1.safe_mode (0x480021de/0x1ae = 0x010f), b v3, t NA mode: OMAP_PIN_INPUT_PULLDOWN \| OMAP_MUX_MODE7 signals: mcspi2_cs1 \| gpt8_pwm_evt \| hsusb2_tll_data3 \| hsusb2_data3 \| gpio_182 \| mm2_txen_n \| NA \| safe_mode 3) echo 0x4 > /debug/omap_mux/mcspi2_cs1 4) cat /debug/omap_mux/mcspi2_cs1 name: mcspi2_cs1.gpio_182 (0x480021de/0x1ae = 0x0004), b v3, t NA mode: OMAP_PIN_OUTPUT \| OMAP_MUX_MODE4 signals: mcspi2_cs1 \| gpt8_pwm_evt \| hsusb2_tll_data3 \| hsusb2_data3 \| gpio_182 \| mm2_txen_n \| NA \| safe_mode 5) echo 182 > /sys/class/gpio/export 6) echo out > /sys/class/gpio/gpio182/direction 7) echo 1 > /sys/class/gpio/gpio182/value

Adam Ford

Advanced Member
Posts:794

17 Jun 2016 08:52 AM
Using our stock evaluation kit, I cannot reproduce your issue. The instructions you posted drive the output of GPIO_182 to 1.8V. I verified this by checking pin 19 on J32. I will e-mail you a screen shot of the scope image that I have. adam

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