arch/risc-v/espressif: Add Analog Comparator for esp32[-h2|-p4]

[eren-terzioglu]

Summary

• Docs/platforms/risc-v: Add Analog Comparator docs for esp32[-h2|-p4]

Add Analog Comparator docs for esp32h2 and esp32p4

• boards/risc-v/espressif: Add Analog Comparator board support for esp32[-h2|-p4]

Add Analog Comparator board support for esp32p4 and esp32h2

• arch/risc-v/espressif: Add Analog Comparator for esp32[-h2|-p4]

Add analog comparator support for esp32p4 and esp32h2

Impact

Impact on user: Yes, analog comparator support added

Impact on build: No

Impact on hardware: Yes, analog comparator support added

Impact on documentation: Yes, related docs added

Impact on security: No

Impact on compatibility: No

Testing

Config used:

esp32p4-function-ev-board:analog_cmpr
esp32h2-devkit:analog_cmpr

With these options:

CONFIG_DEBUG_ANALOG
CONFIG_DEBUG_ANALOG_ERROR
CONFIG_DEBUG_ANALOG_INFO
CONFIG_DEBUG_ANALOG_WARN
CONFIG_DEBUG_FEATURES

Building

Command to build:

make -j distclean && ./tools/configure.sh esp32p4-function-ev-board:analog_cmpr && kconfig-tweak -e CONFIG_DEBUG_ANALOG && kconfig-tweak -e CONFIG_DEBUG_ANALOG_ERROR && kconfig-tweak -e CONFIG_DEBUG_ANALOG_INFO && kconfig-tweak -e CONFIG_DEBUG_ANALOG_WARN && kconfig-tweak -e CONFIG_DEBUG_FEATURES && make olddefconfig && make ESPTOOL_BINDIR=./ -s -j

Running

SRC pin of comparator (GPIO52->P4 GPIO11->H2) connected to GND at first, after that pin connected to 3v3

Snippet used to test is looking like this:

#include <nuttx/config.h>
#include <nuttx/analog/comp.h>
#include <inttypes.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <driver/gpio.h>


int main(int argc, FAR char *argv[])
{
  int fd;
  int ret;
  int res;

  fd = open("/dev/anacmpr0", O_RDONLY);

  while(1)
    {
      ret = read(fd, &res, sizeof(res));
      if (ret != 0)
        {
           printf("Result: %ld\n", res);
        }
    }
  ret = read(fd, &res, sizeof(res));

  return OK;
}

Results

Output:

Result: 0
esp_ana_cmpr_callback: Comparator unit0: Positive cross event triggered
Result: 1
esp_ana_cmpr_callback: Comparator unit0: Negative cross event triggered
Result: 0