Controlling the drive strength of the SPI2 SCK on the Xavier

[mcorke]

I’m trying to configure the drive strength for the SPI2_SCK. I found the following forum entry which suggests it should be possible.

GPIO 417 drive strength configuration

Using the Xavier Dev Kit. Seeing ringing on the output of GPIO 417 (pin 22 on 40 pin header) when output is enabled and driving a 4kohm resistor to ground. I believe the output should be capable of driving 825uA (3.3V/4kohm), so would like to examine what the drive strength is configured to. I have found in documentation there should be a 5 bit configuration to set drive strength. Where are the details on the register address / data to check the configuration of drive strength? How should a…

I have looked at the Pinmux spreadsheet for the Xavier and I don’t see any columns where you can configure the drive strength.

Alternatively can someone point me to an example of how to make the change by modifing the device tree?

[kayccc]

Hi mcorke,

Sorry for the late reply. have you managed to get issue resolved? Any result can be shared?

[ShaneCCC]

Drive strength can be configured through pinmux registers. These are the registers corresponding to SPI1.
PADCTL_UART_CFG2TMC_SPI1_SCK_0
PADCTL_UART_CFG2TMC_SPI1_CS0_0
PADCTL_UART_CFG2TMC_SPI1_CS1_0
PADCTL_UART_CFG2TMC_SPI1_MOSI_0
PADCTL_UART_CFG2TMC_SPI1_MISO_0