1 /*
2 * Author: Yevgeniy Kiveisha <yevgeniy.kiveisha@intel.com>
3 * Copyright (c) 2014 Intel Corporation.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sublicense, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be
14 * included in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25 #include <iostream>
26 #include <unistd.h>
27 #include <stdlib.h>
28 #include <stdexcept>
29
30 #include "max5487.h"
31
32 using namespace upm;
33
MAX5487(int csn)34 MAX5487::MAX5487 (int csn) : m_csnPinCtx(csn), m_spi(0) {
35 mraa::Result error = mraa::SUCCESS;
36 m_name = "MAX5487";
37
38 if (csn == -1) {
39 throw std::invalid_argument(std::string(__FUNCTION__));
40 }
41
42 error = m_csnPinCtx.dir (mraa::DIR_OUT);
43 if (error != mraa::SUCCESS) {
44 throw std::invalid_argument(std::string(__FUNCTION__) +
45 ": mraa_gpio_dir() failed");
46 }
47
48 CSOff ();
49 }
50
51 void
setWiperA(uint8_t wiper)52 MAX5487::setWiperA (uint8_t wiper) {
53 uint8_t data[2] = { 0x00, 0x00};
54
55 CSOn ();
56
57 data[0] = R_WR_WIPER_A;
58 data[1] = wiper;
59
60 uint8_t* retData = m_spi.write(data, 2);
61
62 CSOff ();
63 }
64
65 void
setWiperB(uint8_t wiper)66 MAX5487::setWiperB (uint8_t wiper) {
67 uint8_t data[2] = { 0x00, 0x00};
68
69 CSOn ();
70
71 data[0] = R_WR_WIPER_B;
72 data[1] = wiper;
73
74 uint8_t* retData = m_spi.write(data, 2);
75
76 CSOff ();
77 }
78
79 /*
80 * **************
81 * private area
82 * **************
83 */
84
85 mraa::Result
CSOn()86 MAX5487::CSOn () {
87 return m_csnPinCtx.write(LOW);
88 }
89
90 mraa::Result
CSOff()91 MAX5487::CSOff () {
92 return m_csnPinCtx.write(HIGH);
93 }
94