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 mdec.c
21 *
22 * @brief This is the source file for B91
23 *
24 * @author Driver Group
25 *
26 *******************************************************************************************************/
27 #include"mdec.h"
28 #include "compiler.h"
29 #include "reg_include/mdec_reg.h"
30 #include "analog.h"
31 #include "clock.h"
32
33 /**
34 * @brief This function is used to initialize the MDEC module,include clock setting and input IO select.
35 * @param[in] pin - mdec pin.
36 * In order to distinguish which pin the data is input from,only one input pin can be selected one time.
37 * @return none.
38 */
mdec_init(mdec_pin_e pin)39 void mdec_init(mdec_pin_e pin)
40 {
41 analog_write_reg8(mdec_rst_addr,(analog_read_reg8(mdec_rst_addr) & (~FLD_CLS_MDEC)) | pin);//A0/B7/C4/D0/E0
42 }
43
44 /**
45 * @brief This function is used to read the receive data of MDEC module's IO.
46 * @param[out] dat - The array to store date.
47 * @return 1 decode success, 0 decode failure.
48 */
mdec_read_dat(unsigned char * dat)49 unsigned char mdec_read_dat(unsigned char *dat)
50 {
51 unsigned char m0,m1,m2,data_crc;
52
53 dat[0]=analog_read_reg8(0x6a);
54 dat[1]=analog_read_reg8(0x6b);
55 dat[2]=analog_read_reg8(0x6c);
56 dat[3]=analog_read_reg8(0x6d);
57 dat[4]=analog_read_reg8(0x6e);
58
59 m0= ((dat[0]>>5)<<4);
60 m1= dat[0]&0x07;
61 m2= m0+m1;
62 data_crc=(((m2+dat[1])^dat[2])+dat[3])^0xa5;
63
64 if(data_crc==dat[4]){
65 return 1;
66 }
67 return 0;
68 }
69
70
71
