Hi what is the highest frequency squarewave the GPIO can generate? Thanks
hello blp_engineer,
may I know what’s your use-case.
suggest you also refer to Topic 1030443.
thanks
Hi Jerry Chang thanks for the reply. the user case would be ultrasonic phased array. I am able to generate that 40kHz signal easily with Raspberry Pi because I have the datasheet for the CPU and just write a simple C code for it.
two difficulty I am facing:
- CPU datasheet…I know it is a ARM® Cortex®-A57 based design and there is a generic datasheet for it. But my previous development experience has always been with manufacture provided header file and datasheet.
- If you read this post: What is the Max Input Frequency supported by J41 header GPIO pins? - Jetson Nano - NVIDIA Developer Forums
this guy is also try to write C code for GPIO yet faced difficulties with regard to memory access.
hello blp_engineer,
suggest you refer to below and have implementation to generate square-wave.
thanks
<i>$l4t-r32/kernel_src/kernel/nvidia/kernel-4.9/include/linux/gpio.h</i>
static inline void gpio_set_value(unsigned int gpio, int value)
{
__gpio_set_value(gpio, value);
}
thanks a lot JerryChang