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
19 /********************************************************************************************************
20 * @file lpc.c
21 *
22 * @brief This is the source file for B91
23 *
24 * @author Driver Group
25 *
26 *******************************************************************************************************/
27 #include "lpc.h"
28
29 /**
30 * @brief This function selects input reference voltage for low power comparator.
31 * @param[in] mode - lower power comparator working mode includes normal mode and low power mode.
32 * @param[in] ref - selected input reference voltage.
33 * @return none.
34 */
lpc_set_input_ref(lpc_mode_e mode,lpc_reference_e ref)35 void lpc_set_input_ref(lpc_mode_e mode,lpc_reference_e ref)
36 {
37 if(mode == LPC_LOWPOWER)
38 {
39 analog_write_reg8(0x0b,analog_read_reg8(0x0b)|0x08);
40 analog_write_reg8(0x0d,analog_read_reg8(0x0d)|0x80);
41 }
42 else if(mode == LPC_NORMAL)
43 {
44 analog_write_reg8(0x0b,analog_read_reg8(0x0b)&0xf7);
45 analog_write_reg8(0x0d,analog_read_reg8(0x0d)&0x7f);
46 }
47 analog_write_reg8(0x0d,(analog_read_reg8(0x0d)&0x8f)|(ref<<4));
48 }
49
50
