Subversion Repositories freemyipod

Rev

Go to most recent revision | Details | Last modification | View Log | RSS feed

Rev Author Line No. Line
273 theseven 1 
//
2 
//
3 
//    Copyright 2010 TheSeven
4 
//
5 
//
427 farthen 6 
//    This file is part of emCORE.
273 theseven 7 
//
427 farthen 8 
//    emCORE is free software: you can redistribute it and/or
273 theseven 9 
//    modify it under the terms of the GNU General Public License as
10 
//    published by the Free Software Foundation, either version 2 of the
11 
//    License, or (at your option) any later version.
12 
//
427 farthen 13 
//    emCORE is distributed in the hope that it will be useful,
273 theseven 14 
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
15 
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
16 
//    See the GNU General Public License for more details.
17 
//
18 
//    You should have received a copy of the GNU General Public License along
427 farthen 19 
//    with emCORE.  If not, see <http://www.gnu.org/licenses/>.
273 theseven 20 
//
21 
//
22 
 
23 
 
24 
#include "global.h"
25 
#include "i2c.h"
26 
#include "thread.h"
27 
#include "s5l8702.h"
28 
 
29 
 
30 
static struct mutex i2cmutex;
31 
 
32 
 
33 
void i2c_init()
34 
{
35 
    mutex_init(&i2cmutex);
36 
}
37 
 
38 
void i2c_send(uint32_t bus, uint32_t device, uint32_t address, const uint8_t* data, uint32_t length)
39 
{
40 
    mutex_lock(&i2cmutex, TIMEOUT_BLOCK);
386 theseven 41 
    while (IIC10(bus));
273 theseven 42 
    IICDS(bus) = device & ~1;
386 theseven 43 
    while (IIC10(bus));
273 theseven 44 
    IICSTAT(bus) = 0xF0;
386 theseven 45 
    while (IIC10(bus));
273 theseven 46 
    IICCON(bus) = 0xB7;
47 
    while ((IICCON(bus) & 0x10) == 0) yield();
48 
    if (address >= 0)
49 
    {
50 
        /* write address */
386 theseven 51 
        while (IIC10(bus));
273 theseven 52 
        IICDS(bus) = address;
386 theseven 53 
        while (IIC10(bus));
273 theseven 54 
        IICCON(bus) = 0xB7;
55 
        while ((IICCON(bus) & 0x10) == 0) yield();
56 
    }
57 
    /* write data */
58 
    while (length--)
59 
    {
386 theseven 60 
        while (IIC10(bus));
273 theseven 61 
        IICDS(bus) = *data++;
386 theseven 62 
        while (IIC10(bus));
273 theseven 63 
        IICCON(bus) = 0xB7;
64 
        while ((IICCON(bus) & 0x10) == 0) yield();
65 
    }
66 
    /* STOP */
386 theseven 67 
    while (IIC10(bus));
273 theseven 68 
    IICSTAT(bus) = 0xD0;
386 theseven 69 
    while (IIC10(bus));
273 theseven 70 
    IICCON(bus) = 0xB7;
71 
    while ((IICSTAT(bus) & (1 << 5)) != 0) yield();
72 
    mutex_unlock(&i2cmutex);
73 
}
74 
 
75 
void i2c_recv(uint32_t bus, uint32_t device, uint32_t address, uint8_t* data, uint32_t length)
76 
{
77 
    mutex_lock(&i2cmutex, TIMEOUT_BLOCK);
78 
    if (address >= 0)
79 
    {
80 
        /* START */
386 theseven 81 
        while (IIC10(bus));
273 theseven 82 
        IICDS(bus) = device & ~1;
386 theseven 83 
        while (IIC10(bus));
273 theseven 84 
        IICSTAT(bus) = 0xF0;
386 theseven 85 
        while (IIC10(bus));
273 theseven 86 
        IICCON(bus) = 0xB7;
87 
        while ((IICCON(bus) & 0x10) == 0) yield();
88 
        /* write address */
386 theseven 89 
        while (IIC10(bus));
273 theseven 90 
        IICDS(bus) = address;
386 theseven 91 
        while (IIC10(bus));
273 theseven 92 
        IICCON(bus) = 0xB7;
93 
        while ((IICCON(bus) & 0x10) == 0) yield();
94 
    }
95 
    /* (repeated) START */
386 theseven 96 
    while (IIC10(bus));
273 theseven 97 
    IICDS(bus) = device | 1;
386 theseven 98 
    while (IIC10(bus));
273 theseven 99 
    IICSTAT(bus) = 0xB0;
386 theseven 100 
    while (IIC10(bus));
273 theseven 101 
    IICCON(bus) = 0xB7;
102 
    while ((IICCON(bus) & 0x10) == 0) yield();
103 
    while (length--)
104 
    {
386 theseven 105 
        while (IIC10(bus));
273 theseven 106 
        IICCON(bus) = (length == 0) ? 0x37 : 0xB7; /* NACK or ACK */
107 
        while ((IICCON(bus) & 0x10) == 0) yield();
108 
        *data++ = IICDS(bus);
109 
    }
110 
    /* STOP */
386 theseven 111 
    while (IIC10(bus));
273 theseven 112 
    IICSTAT(bus) = 0x90;
386 theseven 113 
    while (IIC10(bus));
273 theseven 114 
    IICCON(bus) = 0xB7;
115 
    while ((IICSTAT(bus) & (1 << 5)) != 0) yield();
116 
    mutex_unlock(&i2cmutex);
117 
}
118 
 
119 
void i2c_sendbyte(uint32_t bus, uint32_t device, uint32_t address, uint32_t data)
120 
{
121 
    uint8_t buf[1];
122 
    buf[0] = data;
123 
    i2c_send(bus, device, address, buf, 1);
124 
}
125 
 
126 
uint8_t i2c_recvbyte(uint32_t bus, uint32_t device, uint32_t address)
127 
{
128 
    uint8_t buf[1];
129 
    i2c_recv(bus, device, address, buf, 1);
130 
    return buf[0];
131 
}