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
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
/*-------------------------------------------------------------------------
adcopen - initialize AD module
Copyright (C) 2004, Vangelis Rokas <vrokas AT otenet.gr>
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this library; see the file COPYING. If not, write to the
Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA.
As a special exception, if you link this library with other files,
some of which are compiled with SDCC, to produce an executable,
this library does not by itself cause the resulting executable to
be covered by the GNU General Public License. This exception does
not however invalidate any other reasons why the executable file
might be covered by the GNU General Public License.
-------------------------------------------------------------------------*/
#include <pic18fregs.h>
#include <adc.h>
/*
* parameters are:
* channel: one of ADC_CHN_*
* fosc: one of ADC_FOSC_* | ADC_ACQT_* | ADC_CAL
* pcfg: one of ADC_CFG_* (a bitmask with set bits denoting digital ports for many styles)
* config: ADC_FRM_* | ADC_INT_* | ADC_VCFG_* | ADC_NVCFG_* | ADC_PVCFG_*
*/
void
adc_open(unsigned char channel, unsigned char fosc, sdcc_pcfg_t pcfg, unsigned char config)
{
/* disable ADC */
#if (__SDCC_ADC_STYLE == 1865501)
WDTCONbits.ADSHR = 0; /* access ADCON0/1 */
#endif
ADCON0 = 0;
#if (__SDCC_ADC_STYLE == 1802420)
ADCON0 = ((channel & 0x07) << 3) | ((fosc & 0x03) << 6);
ADCON1 = (pcfg & 0x0f) | (config & ADC_FRM_RJUST);
if (fosc & 0x04) {
ADCON1bits.ADCS2 = 1;
}
#elif (__SDCC_ADC_STYLE == 1812200)
ADCON0 = ((channel & 0x07) | (config & ADC_VCFG_AN3_AN2)) << 2;
ADCON1 = (pcfg & 0x7f);
ADCON2 = (ADCON2 & 0x38) | (fosc & 0x07) | (config & ADC_FRM_RJUST);
#elif (__SDCC_ADC_STYLE == 1812300)
ADCON0 = ((channel & 0x03) << 2);
ADCON1 = (pcfg & 0x0f) | (config & ADC_VCFG_VREF);
ADCON2 = (fosc & 0x7f) | (config & ADC_FRM_RJUST);
#elif (__SDCC_ADC_STYLE == 1813502)
ANSEL = pcfg;
ANSELH = (pcfg >> 8);
ADCON0 = ((channel & 0x0f) << 2);
ADCON1 = (config & 0x0f);
ADCON2 = (config & ADC_FRM_RJUST) | (fosc & 0x3f);
#elif (__SDCC_ADC_STYLE == 1823222)
/* use ANSELA, ANSELB, ANSELC, ANSELD, ANSELE registers and
TRISA, TRISB, TRISC, TRISD, TRISE registers to set
corresponding port to analog mode */
/* 46k22 supports up to 28 ADC ports */
ADCON0 = ((channel & 0x1f) << 2);
/* TRIGSEL — — — PVCFG<1:0> NVCFG<1:0> */
ADCON1 = (fosc & ADC_TRIGGER) | (config & 0x0f);
/* ADFM — ACQT<2:0> ADCS<2:0> */
ADCON2 = (config & ADC_FRM_RJUST) | (fosc & 0x3f);
(void)pcfg; /* quieten compiler warning */
#elif (__SDCC_ADC_STYLE == 1822200)
ADCON0 = (channel & 0x0f) << 2;
/* XXX: Should be (pcfg & 0x0f) as VCFG comes from config,
* but we retain compatibility for now ... */
ADCON1 = (pcfg & 0x3f) | (config & ADC_VCFG_AN3_AN2);
ADCON2 = (config & ADC_FRM_RJUST) | (fosc & 0x3f);
#elif (__SDCC_ADC_STYLE == 1824501)
ANCON0 = pcfg;
ANCON1 = (pcfg >> 8);
ADCON0 = ((channel & 0x0f) << 2) | ((config & ADC_VCFG_AN3_AN2) << 2);
ADCON1 = (config & ADC_FRM_RJUST) | (fosc & 0x7f);
#elif (__SDCC_ADC_STYLE == 1865501)
WDTCONbits.ADSHR = 1; /* access ANCON0/1 */
ANCON0 = pcfg;
ANCON1 = (pcfg >> 8);
WDTCONbits.ADSHR = 0; /* access ADCON0/1 */
ADCON0 = ((channel & 0x0f) << 2) | ((config & ADC_VCFG_AN3_AN2) << 2);
ADCON1 = (config & ADC_FRM_RJUST) | (fosc & 0x7f);
#else /* unsupported ADC style */
#error Unsupported ADC style.
#endif
if (config & ADC_INT_ON) {
PIR1bits.ADIF = 0;
PIE1bits.ADIE = 1;
INTCONbits.PEIE = 1;
}
/* enable the A/D module */
ADCON0bits.ADON = 1;
}
|
