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AM2634: Pin PR0_PRU0_GPIO6/K15 can not be configured as digital output (GPO)

Flurin Bühler
Prodigy 70 points
Part Number: AM2634
Other Parts Discussed in Thread: SYSCONFIG

Tool/software:

Hello,

(Am263x Control-Card, CCS 20.2.0, Sysconfig 1.24.0).

I am trying to set pin PR0_PRU0_GPIO6/K15 as digital output and make it toggle.

PIN 121(PR0_PRU0_GPIO10/G18) configured like this toggles without any problems:

PIN 123 (PR0_PRU0_GPIO6/K15) configured like this does not toggle

I checked the generated pinmux configuration for both pins - the generated code both times writes PIN_MODE(7) to the pinmux which seems correct to me.

What am I doing wrong? Is there an additional peripheral i need to configure?

Thanks

Flurin

  • +1
    Prodigy 70 points

    Found it out myself: the pins are connected to the ethernet phy and not to the HSEC connector:

    To be able to use the pins, I2C io-expander U50 needs to be configured, to write signal  ICSSM1_MUX_SEL high

    A software example for this can be found in 
    mcu_plus_sdk_am263x_10_02_00_13/examples/drivers/gpmc/gpmc_psram_io/am263x-cc