# Copyright (c) 2020 Project CHIP Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import("//build_overrides/build.gni")
import("//build_overrides/chip.gni")

import("${build_root}/config/arm.gni")
import("${chip_root}/build/chip/buildconfig_header.gni")

declare_args() {
  # Size of SEGGER RTT up buffer.
  segger_rtt_buffer_size_up = -1

  # Size of SEGGER RTT down buffer.
  segger_rtt_buffer_size_down = -1

  # Number of SEGGER RTT up buffers.
  segger_rtt_max_num_up_buffers = -1

  # Number of SEGGER RTT down buffer.
  segger_rtt_max_num_down_buffers = -1

  # Default mode of SEGGER RTT.
  segger_rtt_mode_default = -1
}

_rtt_asm = ""
if (current_cpu == "arm") {
  if (arm_arch == "armv7-m" || arm_arch == "armv7e-m") {
    _rtt_asm = "SEGGER_RTT_ASM_ARMv7M.S"
  }
}

declare_args() {
  # Use assembly routines for Segger RTT.
  rtt_use_asm = _rtt_asm != ""
}

buildconfig_header("rtt_buildconfig") {
  header = "SEGGER_RTT_BuildConfig.h"
  header_dir = "RTT"

  defines = [ "RTT_USE_ASM=${rtt_use_asm}" ]

  if (segger_rtt_buffer_size_up != -1) {
    defines += [ "BUFFER_SIZE_UP=${segger_rtt_buffer_size_up}" ]
  }
  if (segger_rtt_buffer_size_down != -1) {
    defines += [ "BUFFER_SIZE_DOWN=${segger_rtt_buffer_size_down}" ]
  }
  if (segger_rtt_max_num_up_buffers != -1) {
    defines +=
        [ "SEGGER_RTT_MAX_NUM_UP_BUFFERS=${segger_rtt_max_num_up_buffers}" ]
  }
  if (segger_rtt_max_num_down_buffers != -1) {
    defines +=
        [ "SEGGER_RTT_MAX_NUM_DOWN_BUFFERS=${segger_rtt_max_num_down_buffers}" ]
  }
  if (segger_rtt_mode_default != -1) {
    defines += [ "SEGGER_RTT_MODE_DEFAULT=${segger_rtt_mode_default}" ]
  }
}

config("rtt_config") {
  include_dirs = [
    ".",
    "${root_gen_dir}/include/RTT",
  ]
}

source_set("RTT") {
  sources = [
    "SEGGER_RTT.c",
    "SEGGER_RTT.h",
    "SEGGER_RTT_Conf.h",
  ]

  if (rtt_use_asm) {
    sources += [ _rtt_asm ]
  }

  public_deps = [ ":rtt_buildconfig" ]

  public_configs = [ ":rtt_config" ]
}

source_set("printf") {
  sources = [ "SEGGER_RTT_printf.c" ]

  public_deps = [ ":RTT" ]
}