CircuitPython

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#include <string.h>

#include "py/runtime.h"

#include "Arduino.h"

#include "usb.h"
#include "usb_serial.h"

bool usb_vcp_is_connected(void)
{
  return usb_configuration && (usb_cdc_line_rtsdtr & (USB_SERIAL_DTR | USB_SERIAL_RTS));
}

bool usb_vcp_is_enabled(void)
{
  return true;
}

int usb_vcp_rx_num(void) {
  return usb_serial_available();
}

int usb_vcp_recv_byte(uint8_t *ptr)
{
  int ch = usb_serial_getchar();
  if (ch < 0) {
    return 0;
  }
  *ptr = ch;
  return 1;
}

void usb_vcp_send_str(const char* str)
{
  usb_vcp_send_strn(str, strlen(str));
}

void usb_vcp_send_strn(const char* str, int len)
{
  usb_serial_write(str, len);
}

void usb_vcp_send_strn_cooked(const char *str, int len)
{
  for (const char *top = str + len; str < top; str++) {
    if (*str == '\n') {
      usb_serial_putchar('\r');
    }
    usb_serial_putchar(*str);
  }
}