diff options
Diffstat (limited to 'firmware/export')
-rwxr-xr-x | firmware/export/generic_i2c.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/firmware/export/generic_i2c.h b/firmware/export/generic_i2c.h new file mode 100755 index 0000000000..5570d940fb --- /dev/null +++ b/firmware/export/generic_i2c.h | |||
@@ -0,0 +1,53 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Copyright (C) 2006 by Linus Nielsen Feltzing | ||
11 | * | ||
12 | * All files in this archive are subject to the GNU General Public License. | ||
13 | * See the file COPYING in the source tree root for full license agreement. | ||
14 | * | ||
15 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
16 | * KIND, either express or implied. | ||
17 | * | ||
18 | ****************************************************************************/ | ||
19 | #ifndef _GEN_I2C_ | ||
20 | #define _GEN_I2C_ | ||
21 | |||
22 | struct i2c_interface | ||
23 | { | ||
24 | unsigned char address; /* Address of the chip that this interface | ||
25 | describes */ | ||
26 | |||
27 | void (*scl_hi)(void); /* Drive SCL high, might sleep on clk stretch */ | ||
28 | void (*scl_lo)(void); /* Drive SCL low */ | ||
29 | void (*sda_hi)(void); /* Drive SDA high */ | ||
30 | void (*sda_lo)(void); /* Drive SDA low */ | ||
31 | void (*sda_input)(void); /* Set SDA as input */ | ||
32 | void (*sda_output)(void); /* Set SDA as output */ | ||
33 | void (*scl_input)(void); /* Set SCL as input */ | ||
34 | void (*scl_output)(void); /* Set SCL as output */ | ||
35 | int (*scl)(void); /* Read SCL, returns 0 or non-zero */ | ||
36 | int (*sda)(void); /* Read SDA, returns 0 or non-zero */ | ||
37 | |||
38 | /* These are the delays specified in the I2C specification, the | ||
39 | time pairs to the right are the minimum 100kHz and 400kHz specs */ | ||
40 | void (*delay_hd_sta)(void); /* START SDA hold (tHD:SDA) 4.0us/0.6us */ | ||
41 | void (*delay_hd_dat)(void); /* SDA hold (tHD:DAT) 5.0us/0us */ | ||
42 | void (*delay_su_dat)(void); /* SDA setup (tSU:DAT) 250ns/100ns */ | ||
43 | void (*delay_su_sto)(void); /* STOP setup (tSU:STO) 4.0us/0.6us */ | ||
44 | void (*delay_su_sta)(void); /* Rep. START setup (tSU:STA) 4.7us/0.6us */ | ||
45 | void (*delay_thigh)(void); /* SCL high period (tHIGH) 4.0us/0.6us */ | ||
46 | }; | ||
47 | |||
48 | extern void i2c_add_node(struct i2c_interface *iface); | ||
49 | extern int i2c_write_data(int bus_address, int address, | ||
50 | const unsigned char* buf, int count); | ||
51 | extern int i2c_read_data(int bus_address, int address, | ||
52 | unsigned char* buf, int count); | ||
53 | #endif | ||