source: avrstuff/EPRoxygen/device.h@ 16cf6ff

main
Last change on this file since 16cf6ff was 16cf6ff, checked in by Adrien Destugues <pulkomandy@…>, 12 years ago

Add some suport for reading 27c020 chips.

Should be usable with most other ROMs as well.

git-svn-id: ​svn://pulkomandy.tk/avrstuff@61 c6672c3c-f6b6-47f9-9001-1fd6b12fecbe
  • Property mode set to 100644
File size: 2.8 KB
Line 
1#ifndef _DEVICE_H_
2#define _DEVICE_H_
3
4#pragma once
5
6#include <errno.h>
7#include <stdio.h>
8#include <stdint.h>
9#include <unistd.h>
10
11// FreeBSD
12#include <sys/types.h>
13#include <machine/cpufunc.h>
14#include <machine/sysarch.h>
15
16
17class Device {
18 public:
19 Device()
20 {};
21
22 virtual ~Device() {
23 shutdown();
24 };
25
26 void shutdown();
27 virtual void power() = 0;
28
29 virtual void read(const char* file) = 0;
30 virtual void write(const char* file) = 0;
31 virtual void erase(void) = 0;
32
33 int setup(const int port_base) {
34 port = port_base;
35 if (i386_set_ioperm(port_base, 3, true) != 0)
36 {
37 perror("Unable to get access to parallel port");
38 return errno;
39 }
40 shutdown();
41
42 return 0;
43 }
44 protected:
45 typedef enum {
46 NONE = 0b0011, /* Nothing selected */
47 NYBLE = 0b0100, /* Read low nyble */
48 /* When 0, status reg shows D0.3
49 * When 1, status reg shows D4.7
50 */
51 CTRL = 0b0101, /* Control reg. */
52 /* b0: A16
53 * b1: /A17 (A17 is reversed !)
54 * b2: WE
55 * b3: A18
56 * b4: OE
57 * b5: VPP on pin 25 (0 = enable)
58 * b6: VPP on pin 24 (0 = enable)
59 * b7: CE
60 */
61 VOLT = 0b0110, /* Power config reg. */
62 /* b0: VPP on pin 1 (0 = enable)
63 * b1: VPP on pin 3 (0 = enable)
64 * b2: VCC on pin 32 (0 = enable)
65 * b3: Data reg. output enable (and green led)
66 * b4: VPP config
67 * b5: VPP config
68 * 00 = 24V
69 * 01 = ??
70 * 10 = ??
71 * 11 = 12V
72 * b6: Address reg. output enable
73 * b7: VCC enable (1 = power ON)
74 */
75 ADR0 = 0b1101, /* Low address byte A0.7 */
76 DATA = 0b1110, /* Data byte */
77 ADR1 = 0b1111, /* High address byte A8.15 */
78 /* A13 is reversed ! (also used as VCC pin in smaller packages)
79 */
80 } Register;
81
82 static const uint8_t A13 = 1 << 5;
83
84 typedef enum {
85 A16 = 1,
86 A17 = 2,
87 WE = 4,
88 A18 = 8,
89 OE = 16,
90 VPP25 = 32,
91 VPP24 = 64,
92 CE = 128
93 } CTRLbits;
94
95 typedef enum {
96 VPP1 = 1,
97 VPP3 = 2,
98 VCC32 = 4,
99 DOE = 8,
100
101 V24 = 0,
102 V12 = 48,
103
104 AOE = 64,
105 VCC30 = 128
106 } VOLTbits;
107
108 static inline void write(const Register reg, const uint8_t val)
109 {
110 // To avoid glitches, first set the bits that select the register,
111 // then enable the output. And disable the output when we are done
112 // while not touching the selected reg. This is the only way to
113 // avoid glitches (another reg may be selected long enough for
114 // losing some bits)
115 outb(port, val);
116 usleep(1000);
117 outb(port + 2, reg ^ 4);
118 usleep(1000);
119 outb(port + 2, reg);
120 usleep(1000);
121 outb(port + 2, reg ^ 4);
122 usleep(1000);
123 }
124
125 static inline uint8_t read()
126 {
127 outb(port+2, NYBLE ^ 4);
128 usleep(1000);
129 uint8_t byte = inb(port + 1) & 0xF0;
130
131 outb(port+2, NYBLE);
132 usleep(1000);
133 byte |= inb(port + 1) >> 4;
134 outb(port+2, NYBLE ^ 4);
135 usleep(1000);
136 return byte ^ 0x88;
137 }
138
139 static int port;
140 private:
141};
142
143#endif
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