sw/device/lib/dif/dif_i2s.c

/*
 * Copyright 2023 Google LLC
 * Copyright lowRISC contributors
 *
 * 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.
 */


#include "sw/device/lib/dif/dif_i2s.h"

#include "i2s_regs.h"  // Generated.
#include "sw/device/lib/base/bitfield.h"
#include "sw/device/lib/base/macros.h"
#include "sw/device/lib/dif/dif_base.h"

dif_result_t dif_i2s_rxfifo_empty(const dif_i2s_t* i2s, bool* empty) {
  if (!i2s || !empty) {
    return kDifBadArg;
  }

  uint32_t reg_val = mmio_region_read32(i2s->base_addr, I2S_STATUS_REG_OFFSET);
  *empty = bitfield_bit32_read(reg_val, I2S_STATUS_RXEMPTY_BIT);
  return kDifOk;
}

dif_result_t dif_i2s_txfifo_full(const dif_i2s_t* i2s, bool* full) {
  if (!i2s || !full) {
    return kDifBadArg;
  }

  uint32_t reg_val = mmio_region_read32(i2s->base_addr, I2S_STATUS_REG_OFFSET);
  *full = bitfield_bit32_read(reg_val, I2S_STATUS_TXFULL_BIT);
  return kDifOk;
}