Orin spi transfer interval 20ms

Autonomous Machines Jetson & Embedded Systems Jetson AGX Orin
1

Hi everyone,
I use Orin the bsp is 35.1, I find that SPI transfer interval about 20ms. How to fix it? Thanks.

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3

Sorry for the late response, have you managed to get issue resolved or still need the support? Thanks

4

I need to support, thanks.

7

Please reference to below topic.

8

HI ShaneCCC,
My test case like below:
for (i=0; i<10; i++) {
t1 = ktime_get_real();
gpiod_set_value(gpio, 0);
t2 = ktime_get_real();
gpiod_set_value(gpio, 1);
t3 = ktime_get_real();
spi_read();
t4 = ktime_get_real();
}
t2-t1=20us,t4-t3 sometimes is 100us, mostly 20ms. When I comment gpiod_set_value(gpio, 0) and gpiod_set_value(gpio, 1), t4-t3 =100us. I think setting GPIO will make SPI transfer time longer.

10

Why need set GPIO? What does this GPIO purpose?

Thanks

11

The spi connect a ADC, the ADC need a gpio triger signal to start conversion.

15

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