blob: 92db5a42e319508407f144558e0bfe08b5907d8d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
#ifndef OPENPSU_CALIBRATION_H_
#define OPENPSU_CALIBRATION_H_
#include "util.h"
/****************************************************************************
* Microcontroller CPU speed calibration *
****************************************************************************/
/* System timer calibration. Calibrated to 1000Hz */
#define SYSTIMER_TIMERFREQ ((0 << CS10) | (1 << CS11) | (0 << CS12)) /* == F_CPU/8 */
#define SYSTIMER_CMPVAL 2500
#define JIFFIES_PER_SECOND 1000
/****************************************************************************
* Other hardware calibration *
****************************************************************************/
/* The maximum voltage or current value for the 12bit DAC. */
#define MAX_DAC_VALUE ((1 << 12) - 1)
/****************************************************************************
* Output voltage offset calibration *
****************************************************************************/
/* The maximum voltage value in millivolts. */
#define MAX_VOLTAGE 30000
/* Macro to convert an offset in millivolt to an offset in DAC steps. */
#define mV_offset(milli_offset) \
(int8_t)(((int8_t)(milli_offset) * (int32_t)MAX_DAC_VALUE) / (int32_t)MAX_VOLTAGE)
/* Output voltage calibration.
* The desired mV value is passed to this function.
* It returns the DAC offset that is required for a voltage value
* to really reach it at the output pins. */
static inline int8_t calib_voltage_offset(uint16_t mV)
{
if (mV <= 50)
return mV_offset(0);
if (mV <= 500)
return mV_offset(27);
if (mV <= 6000)
return mV_offset(30);
if (mV <= 10000)
return mV_offset(20);
if (mV <= 13000)
return mV_offset(10);
if (mV <= 15000)
return mV_offset(0);
if (mV <= 17000)
return mV_offset(-10);
if (mV <= 18000)
return mV_offset(-20);
if (mV <= 21000)
return mV_offset(-30);
if (mV <= 30000)
return mV_offset(-40);
BUG_ON(1);
return 0;
}
/****************************************************************************
* Output Current offset calibration *
****************************************************************************/
/* The maximum current value in milliamps. */
#define MAX_CURRENT 3000
/* Macro to convert an offset in milliamps to an offset in DAC steps. */
#define mA_offset(milli_offset) \
(int8_t)(((int8_t)(milli_offset) * (int32_t)MAX_DAC_VALUE) / (int32_t)MAX_CURRENT)
/* Output Max-Current calibration.
* The desired mA value is passed to this function.
* It returns the DAC offset that is required for a Current value
* to really reach it at the output pins. */
static inline int8_t calib_maxcurrent_offset(uint16_t mV)
{
/* TODO */
return mA_offset(0);
}
#endif /* OPENPSU_CALIBRATION_H_ */
|
