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