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Mux configuration

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= Overview =
This How-To wiki 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-This wiki contains:<br> *Mux characteristics summary*Tips to avoid problems*Ways to i used configure mux*Tables that links peripherals and connectors for IGEPv2 and IGEP MODULE  There are three ways to configure mux in IGEP Boards based in OMAP35xx and DM37xx:<br>  *[[Mux_instructions|Configuring MUX from OS User Space]]. This mode has a issue, when your system reboot or shutdown you will need to configure again. [[http://releasesHow to set up UART2 in J990#First_way|Example]].linaro*Configuring MUX by using kernel commandline buddies.org/platform/linaro-m/headless/final/linaro-m-headless-tar-20101108-This way is not avaliable in some cases. [[How to set up UART2 in J990#Second_way|Example]] and [[Linux Kernel 2.tar6.37.gz Linaro Headlessy#Kernel_Parameters|buddies parametres] ].<br> *Editing and Ubuntu 10compile kernel sources.04 with Linaro Toolchain[[How to set up UART2 in J990#Third_way|Example]]. <br>  = Introduction =
Mux (or multiplexer) is a Omap peripheral that can be controlled via software. Its function is connect other peripherals to some available Omap pins.
• '''INPUTENABLE''' (1 bit) drives an input enable signal to the I/O CTRL.
• '''Off mode values''' (5 bits) override the pin state when the OFFENABLE bit CONTROL. This feature is used for power saving management. Pins in off mode can be configured like output with HIGH or LOW value or input with wake-up detection feature. For input pins, OFFOUTENABLE and OFFOUTVALUE bits can not be configured:
-&gt;OFFENABLE: Off mode pin state override control. Set to 1 to enable the feature and to 0 to disable it.
• '''Wake-up''' bits (2 bits):
-&gt;WAKEUPENABLE: Enable wake-up detection on input. It is also the off mode input enable value.<br> -&gt;WAKEUPEVENT: Wake-up event status for the pin.'''<br>'''
NOTE: Off mode can be configured like pin output with a HIGH-&nbspgt;or LOW value or pin input with wakeWAKEUPEVENT: Wake-up detection feature.  NOTE: For input pins, OFFOUTENABLE and OFFOUTVALUE bits can not be configuredevent status for the pin.'''<br> '''
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=== [[Image:Mux pad configuration diagram.png]] ===
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=== Mode selection ===
 
The next table shows all capabilities.<br>
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<br> '''Definitions:'''
'''Mode 0''' is the primary mode. When mode 0 is set, the function mapped to the pin corresponds to the name of the pin. In IGEP some pads don't use primary mode by default.
'''Mode 1 to mode 6''' are possible modes for alternate functions. On each pin, some modes are used effectively for alternate functions, while other modes are unused and correspond to no functional configuration.
'''The safe mode''' (default mode 7) '''avoids any risk of electrical contention by configuring the pin as an input with no functional interface mapped to it. The safe mode is used mainly as the default mode for all pins containing no mandatory interface at the release of power-on reset.  NOTE: For most pads, the reset value for the MUXMODE field is 0b111. The exceptions are pads to be used at boot time to transfer data from selected peripherals to the external flash memory. <br>
=== Pull Selection ===
Note: when a pin is in output mode, pulls are automatically disableThe next table shows all capabilities.
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| Pull-up selected and activated if pin is NOT configured as OUTPUT
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When a pin is in output mode, pulls are automatically disable.
=== Input Enable ===
INPUTENABLE = 0: Input Disable. Pin is configured in output only mode.
INPUTENABLE = 1: Input Enable. Pin is configured in bidirectional mode.  NOTE: For proper functioning of some peripherals INPUTENABLE must be set to 1 for pads configured to drive output clocks:  *SDRC *GPMC *McSPIi *I2Ci *MMCi *McBSPi *HSUSB HOST<br>
=== '''Off mode values''' and '''Wake-up''' ===
This mode is used to disable some pins and reduce low power consumption. <br>  Please contribute ..  = '''IGEP<br>''' = === Important tips<br> === Use the following tips to configure mux without problems:  *Mux can connect multiple connectors at the same peripheral, this improper use can damage the processor. Make sure to disable old connector configuration before use new one. *Some peripherals are only available if you place or replace some resistances. View schematics for more information.<br> *Some connectors share multiples peripherals. You should disable unused peripherals to avoid interferences.&nbsp; For example: if you want to control WIFI module via J990 disable OMAP or if you want use UART2 at j990 disable Bluetooth.<br>
=== Configure mux<br> ===Please contribute.
IgepV2 Board have a default mux configuration, but some cases is necessary change it, for example your project need [[How to set up UART2 in J990|UART2 at j990http://www.ti.com/lit/ug/spruf98x/spruf98x.pdf More information]] connector to transmit data, for this purpose you need change some about 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. There are three ways to configure mux at DM37xx and OMAP35xx:<br>
*Editing OS User Space. this mode has a issue, when your system reboot or shutdown you will need to configure again. [[How to set up UART2 in J990#First_way|Example]]. *Using kernel buddies. This way is ot avaliable in some cases. [[How to set up UART2 in J990#Second_way|Example]]. *Editing and compile kernel sources. [[How to set up UART2 in J990#Third_way|Example]].= Configure Mux =
Mux options are vast, at the beginning can be difficult and tedious change some configurations. Before configure mux, use the following tips to avoid problems:
*Mux can connect multiple connectors at the same peripheral, this improper use can damage the processor. Before configure mux, revise that this peripheral is not used in other pads. See schematics or [[Connectors Summary|connectors summary]] for more information.
*Some peripherals are only available if you place or replace some resistances. See schematics for more information.<br>
*Some connectors share multiples peripherals like OMAP, WIFI/BT combo, etc. You should disable unused peripherals to avoid interferences.&nbsp; For example: if you want to control WIFI module via J990 disable OMAP or if you want use [[How to set up UART2 in J990|UART2 at j990]] disable Bluetooth. See schematics of board or [[Connectors Summary|connectors summary]] or [[Mux_instructions#Disable_Peripherals|how-to disable peripherals]] or [[How_to_use_GPIOs|how-to use gpios]] for more information.
[http://www.ti.com/general/docs/lit/getliterature.tsp?literatureNumber=spruf98v&fileType=pdf More information] about mux.= IGEPv2 ===
= Feedback Next table pretends help you to configure IGEPv2. First column shows some OMAP35xx/DM37xx peripherals and Contributing =first row shows all IGEPv2 connectors. Read articles about connector and peripheral before use them. Each configuration can take different solutions. <br> There are some connectors than have more peripherals available, but they don't have all signals to use it. <br> Table shows four answers:&nbsp;
At any point*"'''Yes, default configuration(utility)'''": Peripheral enabled by default. "utility" shows if this peripheral is used.<br> *"'''Yes, not default configuration(information)'''": Peripheral don't enabled by default. Maybe you see a mistake you need to disable other one<br> *"'''No, via hardware'''": Not available, but via hardware (placing or replacing some resistances) can contribute to this How-Tobe enabled. <br> *"'''No'''"
= Available peripherals on external connector = The next tables show you all the mux capabilities:  <br>  {| cellspacing="1" cellpadding="1" border="1" widthstyle="200width: 933px; height: 409px;"
|-
| <br> | [[Connectors Summary#J990_connector| J990 ]] | [[Connectors Summary#J960_connector| J960 ]] | [[Connectors Summary#J970_connector| J970 ]] | [[Connectors Summary#J400_connector| J400]] | [[Connectors Summary#JC30_connector|JC30]] | [[Connectors Summary#JA42_connector|JA42]] | [[Connectors Summary#JA41_connector|JA41]]
|-
| [[Peripherals Summary#UART|UART1]]
| No
| Yes, not default configuration ([[Mux instructions#UART1_in_J990UART1_in_J960|Yesdisable RS485]] )
| No
| No| No | No | Yes, not default configuration ([[Mux_instructions#TFP410|disable DVI]])
|-
| [[Peripherals Summary#UART|UART2]]
| Yes, not default configuration ([[How to set up UART2 in J990|Yesdisable Bluetooth]] ) | YesNo, [[How to use UARTs#RS232_Schematic_Igep_V2|via hardware ]],  [[Mux instructions#Bluetooth|disable Bluetooth]]  | No | No | No
| No
| No
| [[Peripherals Summary#UART|UART3]]
| No
| Yes , default configuration (default[[Mux instructions#UART3_in_J960|Serial debug]]) | No
| No
| No| No | Yes, not default configuration ([[Mux_instructions#TFP410|disable DVI]])
|-
| [[Peripherals Summary#UART|UART4]]
| No
| No
| No
| No
| No
|-
| [[Peripherals Summary#GPIO|GPIO]]
| Yes , default configuration ([[Mux instructions#GPIO_in_J990|info]])  
| No
| No
| Yes, not default configuration ([[Mux instructions#GPIO_in_J990|disable JTAG]]) | Yes, default configuration | Yes, default configuration | Yes, not default configuration ([[Mux_instructions#TFP410|disable DVI]])
|-
| [[Peripherals Summary#SPI|McSPI1]]
| No<br>
| No
| No
| No
| No
| No
| Yes, default configuration
| No
|-
| [[Peripherals Summary#SPI|McSPI2]]
| No<br> | No | No | No
| No
| No
|-
| [[Peripherals Summary#SPI|McSPI3]]
| Yes , not default configuration ([[Mux instructions#WIFI|disable WIFI]])  | No | No | No
| No
| No
| NoYes, not default configuration ([[Mux_instructions#TFP410|disable DVI]])<br>
|-
| [[Peripherals Summary#SPI|McSPI4]]
| Yes , not default configuration ([[Mux instructions#GPIO_in_J990|disable GPIOs]]) | No | No | No
| No
| No
|-
| [[Peripherals Summary#BSP|McBSP1]]
| Yes , not default configuration (default[[Mux instructions#GPIO_in_J990|disable GPIOs]]) | No | No | No
| No
| No
|-
| [[Peripherals Summary#BSP|McBSP2]]
| No
| No
| No
| No
| No
|-
| [[Peripherals Summary#BSP|McBSP3]]
| Yes , default configuration ([[Mux instructions#TP65950_PCM_VSP|Bluetooth audio]]) | No | No | No
| No
| No
| No
| No
| No
| No
| Yes, not default configuration ([[Mux instructions#GPIO_in_J990|disable GPIOs]])
| No
|-
| [[Peripherals Summary#BSP|McBSP5]]
| No
| No
| No
| No
| No
|-
| [[Peripherals Summary#MMC|MMC1]]
| No
| No
| No
| No
| No
|-
| [[Peripherals Summary#MMC|MMC2]]
| Yes , default configuration (disable [[Mux instructions#WIFI|WIFI]]) | No | No | No
| No
| No
|-
| [[Peripherals Summary#MMC|MMC3]]
| No | No | No | No
| No
| No
|-
| [[Peripherals Summary#I2C|I2C1]]
| No | No | No | No
| No
| No
|-
| [[Peripherals Summary#I2C|I2C2]]
| Yes, default configuration | No | No
| No
| No, [[Connectors Summary#JC30_connector|via hardware]]
| No
| No
|-
| [[Peripherals Summary#I2C|I2C3]]
|
| No
| No
| No| No | No | No | Yes, default configuration (DVI)
|-
| [[Peripherals Summary#I2C|I2C4]]
| No | No | No | No
| No
| No
|}
<br> === IGEP MODULE ===
Next table pretends help you to configure IGEP MODULE. First column shows some OMAP35xx/DM37xx peripherals and first row shows all IGEP MODULE connectors. Read articles about connector and peripheral before use them. Each configuration can take different solutions. <br> There are some connectors than have more peripherals available, but they don't have all signals to use it. <br> Table shows four answers:&nbsp;  *"'''Yes, default configuration(utility)'''": Peripheral enabled by default. "utility" shows if this peripheral is used.<br> *"'''Yes, not default configuration(information)'''": Peripheral don't enabled by default. Maybe you need to disable other one<br> *"'''No, via hardware'''": Not available, but via hardware (placing or replacing some resistances) can be enabled.<br> *"'''No'''" {| cellspacing="1" cellpadding="1" border="1" widthstyle="200width: 933px; height: 190px;"
|-
| <br>| JC30 [[Connectors Summary#J1_connector|J1]] | JA42 [[Connectors Summary#J4_connector|J4]] | JA41 [[Connectors Summary#J5_connector| TPJ5]]
|-
| [[Peripherals Summary#UART|UART1]]
| No Yes, not default configuration (disable DSS) | No | No Yes, default configuration
| No
|-
| [[Peripherals Summary#UART|UART2]]
| No | No Yes, not default configuration(enable: TX and RX)
| No
| No
|-
| [[Peripherals Summary#UART|UART3]]
| No | No Yes, default configuration
| No
| No
| [[Peripherals Summary#UART|UART4]]
| No
| No Yes, not default configuration(disable: GPIO_64 and GPMC_WAIT3) | No | [[Peripherals Summary#UART|No]]
|-
| [[Peripherals Summary#GPIO|GPIO]]
| Yes , default configuration | Yes , default configuration | Yes | Yes, default configuration
|-
| [[Peripherals Summary#SPI|McSPI1]]
| No
| Yes | No , default configuration
| No
|-
| [[Peripherals Summary#SPI|McSPI2]]
| No
| No
| No
|-
| [[Peripherals Summary#SPI|McSPI3]]
| No | No Yes, not default configuration (disable DSS)
| No
| No
|-
| [[Peripherals Summary#SPI|McSPI4]]
| No
| No
| No
|-
| [[Peripherals Summary#BSP|McBSP1]]
| No
| No
| No
|-
| [[Peripherals Summary#BSP|McBSP2]]
| No
| No
| No
|-
| [[Peripherals Summary#BSP|McBSP3]]
| No | No Yes, not default configuration (disable UART2)
| No
| No
| [[Peripherals Summary#BSP|McBSP4]]
| No
| Yes , not default configuration (default?disable GPMCs) | No | Yes, partial
|-
| [[Peripherals Summary#BSP|McBSP5]]
| No
| No | No Yes, not default configuration (disable GPIOs)
| No
|-
| No
| No
| No | No ()
|-
| [[Peripherals Summary#MMC|MMC2]]
| No
| No
| No
|-
| [[Peripherals Summary#MMC|MMC3]]
| No | No | | Yes, not default configuration (disable GPIOs)
|-
| [[Peripherals Summary#I2C|I2C1]]
| No | No | | No
|-
| [[Peripherals Summary#I2C|I2C2]]
| No | No | | No
|-
| [[Peripherals Summary#I2C|I2C3]]
| Yes, default configuration (J5) | No | | Yes, default configuration (J1)
|-
| [[Peripherals Summary#I2C|I2C4]]
| No | No | | No
|}
'''(Revise tables and join if its necessary, multiples connector for some peripherals (mmc3))''' [[Category:Work_in_progress]] '''Under construction'''[[Category:Peripherals]]
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