Difference between revisions of "Mux configuration"

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= Available peripherals on external connector  =
 
= Available peripherals on external connector  =
  
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Before configure mux is necessary review some things:
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Before configure mux is necessary review some things:  
  
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- If connector is shared with other peripherals you should disable it (high impedance)
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- If connector is shared with other peripherals you should disable it via software or hardware.<br>
  
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- Don't use the same peripheral in more than one pad.
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- Don't use the same peripheral in more than one pad.  
  
 
The next tables show you all the mux capabilities:  
 
The next tables show you all the mux capabilities:  
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peripheral using Omap GPIO low level (GND). If you reset continuously
 
peripheral using Omap GPIO low level (GND). If you reset continuously
 
Bluethoot all their pads are in High Impedance. Also you can disable Bluethoot from J990 low level.
 
Bluethoot all their pads are in High Impedance. Also you can disable Bluethoot from J990 low level.
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use it.'''(1)'''&lt;/font&lt;/div&gt;
 
use it.'''(1)'''&lt;/font&lt;/div&gt;
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Revision as of 13:12, 22 November 2011

Overview

Mux (or multiplexer) is a Omap peripheral that can be controlled via software. Its function is connect other Omap peripherals to some available Omap pads.

IgepV2 Board have a default mux configuration, but some cases is necessary change it, for example your project need UART2 at j990 connector to transmit data, for this purpose you need change some mux configurations to enable it and be sure that this modification don't break or interferes in other IC or peripherals. The mux options are vast.

This How-To is meant to be a starting point for people to learn configure mux for IGEP v2 devices as quickly and easily as possible. For this how-to i used Linaro Headless and Ubuntu 10.04 with Linaro toolchain.

Feedback and Contributing

At any point, if you see a mistake you can contribute to this How-To.

Available peripherals on external connector

Before configure mux is necessary review some things:

- If connector is shared with other peripherals you should disable it via software or hardware.

- Don't use the same peripheral in more than one pad.

The next tables show you all the mux capabilities:

J990 connector

Pad: Connect to: Default peripheral (mode=0)(3) Default function: Other available peripherals: Share with:
1 VIO 1V8 - Power 1v8 - -
2 DC 5V - Power 5v - -
3 MMC2_DAT7 MMC2_DAT7 Reset Wlan

MMC2_CLKIN(mode=1)

MMC3_DAT3(mode=3)

GPIO_139(mode=4)

Wlan: This pad can reset Wlan peripheral using Omap GPIO low level (GND). If you reset continuously Wlan all their pads are in High Impedance. Also you can disable Wlan from J990 low level.
Omap: protect Omap pad if you don't use it.(1)
5 MMC2_DAT6 MMC2_DAT6 Power down  Wlan

MMC2_DIR_CMD(mode=1)

MMC3_DAT2(mode=3)

GPIO_138(mode=4)

Wlan: This pad can power down Wlan peripheral using Omap GPIO low level (GND), power up removing GND. Also you can power down Wlan from J990 low level.
Omap: protect Omap pad if you don't use it.(1)
7 MMC2_DAT5 MMC2_DAT5 Reset Bluethoot

MMC2_DIR_DAT1(mode=1)

MMC3_DAT1(mode=3)

GPIO_137(mode=4)

Bluethoot: This pad can reset Bluethoot

peripheral using Omap GPIO low level (GND). If you reset continuously Bluethoot all their pads are in High Impedance. Also you can disable Bluethoot from J990 low level.

















Omap: protect Omap pad if you don't use it.(1)<font size="2"</font>

9 MMC2_DAT4 MMC2_DAT4 -

MMC_DIR_DAT0(mode=1)

MMC3_DAT0(mode=3)

GPIO136(mode=4)

Wlan: Protect Wlan if you don' use it. See MMC2_DAT7 pad.
Omap: protect Omap pad if you don't use it.(1)
11 MMC2_DAT3 MMC2_DAT3 Transfer data between Omap and Wlan

McSPI3_CS0(mode=1)

GPIO_135(mode=4)

Wlan: Protect Wlan if you don' use it. See MMC2_DAT7 pad.
Omap: protect Omap pad if you don't use it.(1)
13 MMC2_DAT2 MMC2_DAT2 Transfer data between Omap and Wlan

McSPI3_CS1(mode=1)

GPIO_134(mode=4)

Wlan: Protect Wlan if you don' use it. See MMC2_DAT7 pad.
Omap: protect Omap pad if you don't use it.(1)
15 MMC2_DAT1 MMC2_DAT1 Transfer data between Omap and Wlan  GPIO_133(mode=4)
Wlan: Protect Wlan if you don' use it. See MMC2_DAT7 pad.
Omap: protect Omap pad if you don't use it.(1)
17 MMC2_DAT0 MMC2_DAT0 Transfer data between Omap and Wlan

McSPI3_SOMI(mode=1)

GPIO_132(mode=4)

Wlan: Protect Wlan if you don' use it. See MMC2_DAT7 pad.
Omap: protect Omap pad if you don't use it.(1)
19 MMC2_CMD MMC2_CMD Control Wire for bus MMC2 (Wlan)

McSPI3_SIMO(mode=1)

GPIO_131(mode=4)

Wlan: Protect Wlan if you don' use it. See MMC2_DAT7 pad.
Omap: protect Omap pad if you don't use it.(1)
21 MMC2_CLK0 MMC2_CLK Clock for MMC2 (Wlan)

McSPI3_CLK(mode=1)

GPIO_130(mode=4)

Wlan: Protect Wlan if you don' use it. See MMC2_DAT7 pad.
Omap: protect Omap pad if you don't

use it.(1)</font</div>
















4 MCBSP3_DX MCBSP3_DX Transmitted serial Data (Bluethoot audio)

UART2_CTS(mode=1)

GPIO_140(mode=4)

TPS65950: disable it via kernel (2) If you don't use it.
6 MCBSP3_CLKX MCBSP3_CLKX Transmitted serial Clock (Bluethoot audio)

UART2_TX(mode=1)

GPIO_142(mode=4)

Bluethoot: Protect Bluethoot if you don' use it. See MMC2_DAT5 pad.

TPS65950: disable it via kernel (2) If you don't use it.
8 MCBSP3_FSX MCBSP3_FSX Transmited Frame Syncronisation (Bluethoot audio)

UART2_RX(mode=1)

GPIO_143(mode=4)

Bluethoot: Protect Bluethoot if you don' use it. See MMC2_DAT5 pad.

TPS65950: disable it via kernel (2) If you don't use it.
10 MCBSP3_DR MCBSP3_DR Received Serial Data (Bluethoot audio)

UART2_RTS(mode=1)

GPIO_141(mode=4)

TPS65950: disable it via kernel (2) If you don't use it.
12 MCBSP1_DX MCBSP1_DX Transmited serial Data (not used)

McSPI4_SIMO(mode=1)

McBSP3_DX(mode=2)

GPIO_158(mode=4)

-
14 MCBSP1_CLKX MCBSP1_CLKX Transmited serial clock (not used)

McBSP3_CLKX(mode=2)

GPIO_162(mode=4)

-
16 MCBSP1_FSX MCBSP1_FSX Transmited Frame Syncronization (not used)

McSPI4_CS0(mode=1)

McBSP3_FSX(mode=2)

GPIO_161(mode=4)

-
18 MCBSP1_DR MCBSP1_DR Received Serial Data (not used)

McSPI4_SOMI(mode=1)

McBSP3_DR(mode=2)

GPIO_159(mode=4)

-
20 MCBSP1_CLKR MCBSP1_CLKR Received Clock (not used)

GPIO_156(mode=4)

 -
22 MCBSP1_FSR MCBSP1_FSR Received frame syncronization (not used)

GPIO_157(mode=4)

 -
23 I2C2_SDA I2C2_SDA I2C Data

GPIO_183(mode=4)
Cam connector: Check and RC14 is not welded or don't use it.
24 I2C2_SCL I2C2_SCL I2C Clock

GPIO_168(mode=4)

 Cam connector: Check and RC13 is not welded or don't use it.
25 REGEN -
- -
26 nRESET - Read Reset Omap - -
27 GND - GND - -
28 GND - GND - -

(1): To protect Omap pads from esternal signals configure Mux in mode=7 (safe_mode). With this mode, buffer is configured in high impedance

(2): Disable TPS65950 go to file sound/soc/codecs/twl4030.c change line 54 Code: 

0x00, /* REG_VOICE_IF (0xF) */

to Code: 

0x04, /* REG_VOICE_IF (0xF) */

(3): Omap mux have 8 modes, somes modes are disable in some pads.

Under construction

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