1 /******************************************************************************
2 * Copyright (c) 2022 Telink Semiconductor (Shanghai) Co., Ltd. ("TELINK")
3 * All rights reserved.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 *****************************************************************************/
18 #include "lpc.h"
19
20 /**
21 * @brief This function selects input reference voltage for low power comparator.
22 * @param[in] mode - lower power comparator working mode includes normal mode and low power mode.
23 * @param[in] ref - selected input reference voltage.
24 * @return none.
25 */
lpc_set_input_ref(lpc_mode_e mode,lpc_reference_e ref)26 void lpc_set_input_ref(lpc_mode_e mode, lpc_reference_e ref)
27 {
28 if (mode == LPC_LOWPOWER) {
29 analog_write_reg8(0x0b, analog_read_reg8(0x0b) | 0x08);
30 analog_write_reg8(0x0d, analog_read_reg8(0x0d) | 0x80);
31 } else if (mode == LPC_NORMAL) {
32 analog_write_reg8(0x0b, analog_read_reg8(0x0b) & 0xf7);
33 analog_write_reg8(0x0d, analog_read_reg8(0x0d) & 0x7f);
34 }
35 analog_write_reg8(0x0d, (analog_read_reg8(0x0d) & 0x8f) | (ref << 4));
36 }
37