jetson nx pwm c++

As an AI language model, I do not have the ability to provide specific coding instructions for Jetson NX PWM C programming. However, here are some general steps to get started with PWM programming on Jetson NX using C language:

1. Include the necessary headers: You will need to include the following headers in your C program to use PWM on Jetson NX:

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>

2. Open the PWM controller device: You will need to open the PWM controller device "/dev/pwm" using the open() function. This will give you a file descriptor to the device.

int fd = open("/dev/pwm", O_RDWR);
if (fd < 0) {
    printf("Error opening PWM device\n");
    exit(1);
}

3. Map the PWM controller memory: Use the mmap() function to map the PWM controller memory into your program's address space. This will allow you to access the PWM controller's registers directly from your program.

#define PWM_BASE_ADDRESS 0x7000a000
#define PWM_MAP_SIZE 0xfff
void *pwm_map = mmap(NULL, PWM_MAP_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, PWM_BASE_ADDRESS);
if (pwm_map == MAP_FAILED) {
    printf("Error mapping PWM memory\n");
    exit(1);
}

4. Configure the PWM channel: You can configure the PWM channel by setting the appropriate values in the PWM controller's registers. For example, to set the PWM frequency to 100Hz and the duty cycle to 50%, you can use the following code:

#define PWM_PERIOD 1000000 // 100Hz frequency
#define PWM_DUTY_CYCLE (PWM_PERIOD/2) // 50% duty cycle
*(unsigned int *)(pwm_map + 0x00) = PWM_PERIOD;
*(unsigned int *)(pwm_map + 0x04) = PWM_DUTY_CYCLE;
*(unsigned int *)(pwm_map + 0x08) = 0x01; // enable PWM channel 0

5. Close the PWM controller device: When you are done using the PWM controller, you should close the device using the close() function.

close(fd);

Note: The above code is just an example and may not work for your specific use case. You will need to consult the Jetson NX documentation and reference manual for detailed information on using PWM in your application.