Subversion Repositories freemyipod

Rev

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 
 
560 theseven 33 
static void i2c_on(int bus)
34 
{
35 
    /* enable I2C clock */
36 
    clockgate_enable(CLOCKGATE_I2C(bus), true);
37 
 
38 
    IICCON(bus) = (1 << 7) | /* ACK_GEN */
39 
                  (0 << 6) | /* CLKSEL = PCLK/16 */
40 
                  (1 << 5) | /* INT_EN */
41 
                  (1 << 4) | /* IRQ clear */
42 
                  (7 << 0);  /* CK_REG */
43 
 
44 
    /* serial output on */
45 
    IICSTAT(bus) = (1 << 4);
46 
}
47 
 
48 
static void i2c_off(int bus)
49 
{
50 
    /* serial output off */
51 
    IICSTAT(bus) = 0;
52 
 
53 
    /* disable I2C clock */
54 
    clockgate_enable(CLOCKGATE_I2C(bus), false);
55 
}
56 
 
273 theseven 57 
void i2c_init()
58 
{
59 
    mutex_init(&i2cmutex);
60 
}
61 
 
62 
void i2c_send(uint32_t bus, uint32_t device, uint32_t address, const uint8_t* data, uint32_t length)
63 
{
64 
    mutex_lock(&i2cmutex, TIMEOUT_BLOCK);
560 theseven 65 
	i2c_on(bus);
386 theseven 66 
    while (IIC10(bus));
273 theseven 67 
    IICDS(bus) = device & ~1;
386 theseven 68 
    while (IIC10(bus));
273 theseven 69 
    IICSTAT(bus) = 0xF0;
386 theseven 70 
    while (IIC10(bus));
273 theseven 71 
    IICCON(bus) = 0xB7;
72 
    while ((IICCON(bus) & 0x10) == 0) yield();
73 
    if (address >= 0)
74 
    {
75 
        /* write address */
386 theseven 76 
        while (IIC10(bus));
273 theseven 77 
        IICDS(bus) = address;
386 theseven 78 
        while (IIC10(bus));
273 theseven 79 
        IICCON(bus) = 0xB7;
80 
        while ((IICCON(bus) & 0x10) == 0) yield();
81 
    }
82 
    /* write data */
83 
    while (length--)
84 
    {
386 theseven 85 
        while (IIC10(bus));
273 theseven 86 
        IICDS(bus) = *data++;
386 theseven 87 
        while (IIC10(bus));
273 theseven 88 
        IICCON(bus) = 0xB7;
89 
        while ((IICCON(bus) & 0x10) == 0) yield();
90 
    }
91 
    /* STOP */
386 theseven 92 
    while (IIC10(bus));
273 theseven 93 
    IICSTAT(bus) = 0xD0;
386 theseven 94 
    while (IIC10(bus));
273 theseven 95 
    IICCON(bus) = 0xB7;
96 
    while ((IICSTAT(bus) & (1 << 5)) != 0) yield();
560 theseven 97 
	i2c_off(bus);
273 theseven 98 
    mutex_unlock(&i2cmutex);
99 
}
100 
 
101 
void i2c_recv(uint32_t bus, uint32_t device, uint32_t address, uint8_t* data, uint32_t length)
102 
{
103 
    mutex_lock(&i2cmutex, TIMEOUT_BLOCK);
560 theseven 104 
	i2c_on(bus);
273 theseven 105 
    if (address >= 0)
106 
    {
107 
        /* START */
386 theseven 108 
        while (IIC10(bus));
273 theseven 109 
        IICDS(bus) = device & ~1;
386 theseven 110 
        while (IIC10(bus));
273 theseven 111 
        IICSTAT(bus) = 0xF0;
386 theseven 112 
        while (IIC10(bus));
273 theseven 113 
        IICCON(bus) = 0xB7;
114 
        while ((IICCON(bus) & 0x10) == 0) yield();
115 
        /* write address */
386 theseven 116 
        while (IIC10(bus));
273 theseven 117 
        IICDS(bus) = address;
386 theseven 118 
        while (IIC10(bus));
273 theseven 119 
        IICCON(bus) = 0xB7;
120 
        while ((IICCON(bus) & 0x10) == 0) yield();
121 
    }
122 
    /* (repeated) START */
386 theseven 123 
    while (IIC10(bus));
273 theseven 124 
    IICDS(bus) = device | 1;
386 theseven 125 
    while (IIC10(bus));
273 theseven 126 
    IICSTAT(bus) = 0xB0;
386 theseven 127 
    while (IIC10(bus));
273 theseven 128 
    IICCON(bus) = 0xB7;
129 
    while ((IICCON(bus) & 0x10) == 0) yield();
130 
    while (length--)
131 
    {
386 theseven 132 
        while (IIC10(bus));
273 theseven 133 
        IICCON(bus) = (length == 0) ? 0x37 : 0xB7; /* NACK or ACK */
134 
        while ((IICCON(bus) & 0x10) == 0) yield();
135 
        *data++ = IICDS(bus);
136 
    }
137 
    /* STOP */
386 theseven 138 
    while (IIC10(bus));
273 theseven 139 
    IICSTAT(bus) = 0x90;
386 theseven 140 
    while (IIC10(bus));
273 theseven 141 
    IICCON(bus) = 0xB7;
142 
    while ((IICSTAT(bus) & (1 << 5)) != 0) yield();
560 theseven 143 
	i2c_off(bus);
273 theseven 144 
    mutex_unlock(&i2cmutex);
145 
}
146 
 
147 
void i2c_sendbyte(uint32_t bus, uint32_t device, uint32_t address, uint32_t data)
148 
{
149 
    uint8_t buf[1];
150 
    buf[0] = data;
151 
    i2c_send(bus, device, address, buf, 1);
152 
}
153 
 
154 
uint8_t i2c_recvbyte(uint32_t bus, uint32_t device, uint32_t address)
155 
{
156 
    uint8_t buf[1];
157 
    i2c_recv(bus, device, address, buf, 1);
158 
    return buf[0];
159 
}