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= Overview = This wiki is meant to be a starting point for people to learn configure mux for IGEP devices as quickly and easily as possible. This wiki contains:<br> *Mux characteristics summary*Tips to avoid problems*Ways to 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. [[How to set up UART2 in J990#First_way|Example]]. *Configuring MUX by using kernel commandline buddies. This way is currently no text not avaliable in some cases. [[How to set up UART2 in J990#Second_way|Example]] and [[Linux Kernel 2.6.37.y#Kernel_Parameters|buddies parametres]].<br> *Editing and compile kernel sources. [[How to set up UART2 in this pageJ990#Third_way|Example]]. You <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.  Each pin is configurable by software using its associated pad configuration register field, which is 16 bits wide:  {| cellspacing="1" cellpadding="1" border="1" align="center"|-| [[Image:Mux register.png]]|} <br> One pad configuration register field is available for each pin. Each 32-bit pad configuration register is grouped into two 16-bit pad configuration register fields. One pad configuration register provides control for two different pins. These registers can be accessed using 8, 16 and 32 bits operations.<br>  The functional bits of a pad configuration register field are divided into the following five fields:  • '''MUXMODE''' (3 bits) defines the multiplexing mode applied to the pin.A mode corresponds to the selection of the functionality mapped on the pin with six (0 to 5) possible functional modes for each pin. • '''PULL''' (2 bits) for combinational pullup/pulldown configuration:  -&gt; PULLTYPESELECT: Pullup/pulldown selection for the pin. -&gt; PULLUDENABLE: Pullup/pulldown enable for the pin. • '''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./ -&gt;OFFOUTENABLE: Off mode output enable value. Set to 0 to enable the feature and to 1 to disable it. -&gt;OFFOUTVALUE: Off mode output value. -&gt;OFFPULLUDENABLE: Off mode pullup/indexpulldown enable.php -&gt;OFFPULLTYPESELECT: Off mode pullup/Specialpulldown selection.  • '''Wake-up''' bits (2 bits):  -&gt;WAKEUPENABLE: Enable wake-up detection on input. It is also the off mode input enable value.  -&gt;WAKEUPEVENT:Search/AsdfdsfsaWake-up event status for the pin.'''<br>'''  {| cellspacing="1" cellpadding="1" border="1" align="center" width="200"|-|search for this page title[[Image:Mux pad configuration diagram.png]] in  |} === Mode selection === The next table shows all capabilities.<br>  {| cellspacing="1" cellpadding="1" border="1" style="width: 287px; height: 235px;"|-| MUXMODE | Select Mode|-| 0b000=0 | Mode 0 (Primary mode)|-| 0b001=1 | Mode 1 (Possible mode)<br>|-| 0b010=2 | Mode 2 (Possible mode)|-| 0b011=3 | Mode 3 (Possible mode)|-| 0b100=4 | Mode 4 (Possible mode)|-| 0b101=5 | Mode 5 (Possible mode)|-| 0b110=6 | Mode 6 (Possible mode)|-| 0b111=7 | Mode 7 (Safe Mode)<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 pages, 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.<span classbr> === Pull Selection === The next table shows all capabilities.  {| cellspacing="1" cellpadding="plainlinks1"border="1" style="width: 696px; height: 1px;"|-| PULLTYPESELECT | PULLUDENABLE | Pin Behavior|-| 0b0 | 0b0 | Pull-down selected but not activated|-| 0b0 | 0b1 | Pull-down selected and activated if pin is NOT configured as OUTPUT|-| 0b1 | 0b0 | Pull-up selected but not activated|-| 0b1 | 0b1 | Pull-up selected and activated if pin is NOT configured as OUTPUT|} 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.<br>  === '''Off mode values''' and '''Wake-up''' === This mode is used to disable some pins and reduce power consumption. <br> Please contribute.  [[http://www.ti.com/lit/ug/spruf98x/spruf98x.pdf More information] about mux. = 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/indexBT combo, etc. You should disable unused peripherals to avoid interferences.php?title=Special&nbsp; For example:Log&page=Asdfdsfsaif 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|search the related logshow-to disable peripherals]],or [[How_to_use_GPIOs|how-to use gpios]] for more information. === IGEPv2 === Next table pretends help you to configure IGEPv2.First column shows some OMAP35xx/DM37xx peripherals and 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;  *"'''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./indexMaybe you need to disable other one<br> *"'''No, via hardware'''": Not available, but via hardware (placing or replacing some resistances) can be enabled.php?title<br> *"'''No'''" {| cellspacing=Asdfdsfsa&action"1" cellpadding="1" border="1" style=edit"width: 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_J960|disable 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|disable Bluetooth]]) | No, [[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 ([[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 | 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 | No | No | No | No | Yes, default configuration | No|-| [[Peripherals Summary#SPI|McSPI2]] | No | No | No | No | No | No | No|-| [[Peripherals Summary#SPI|McSPI3]] | Yes, not default configuration ([[Mux instructions#WIFI|disable WIFI]])  | No | No | No | No | No | Yes, not default configuration ([[Mux_instructions#TFP410|edit this pagedisable DVI]])<br>|-| [[Peripherals Summary#SPI|McSPI4]] | Yes, not default configuration ([[Mux instructions#GPIO_in_J990|disable GPIOs]]) | No | No | No | No | No | No|-| [[Peripherals Summary#BSP|McBSP1]] | Yes, not default configuration ([[Mux instructions#GPIO_in_J990|disable GPIOs]]) | No | No | No | No | No | No|-| [[Peripherals Summary#BSP|McBSP2]] | No | No | 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|-| [[Peripherals Summary#BSP|McBSP4]] | 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 | No | No|-| [[Peripherals Summary#MMC|MMC1]] | No | No | No | No | No | No | No|-| [[Peripherals Summary#MMC|MMC2]] | Yes, default configuration ([[Mux instructions#WIFI|WIFI]]) | No | No | No | No | No | No|-| [[Peripherals Summary#MMC|MMC3]] | No | No | No | No | No | No | No|-| [[Peripherals Summary#I2C|I2C1]] | No | 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 | No|} === IGEP MODULE === Next table pretends help you to configure IGEP MODULE. First column shows some OMAP35xx/spanDM37xx 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" style="width: 933px; height: 190px;"|-| <br>| [[Connectors Summary#J1_connector|J1]] | [[Connectors Summary#J4_connector|J4]] | [[Connectors Summary#J5_connector|J5]]|-| [[Peripherals Summary#UART|UART1]] | Yes, not default configuration (disable DSS) | Yes, default configuration | No|-| [[Peripherals Summary#UART|UART2]] | Yes, not default configuration(enable: TX and RX) | No | No|-| [[Peripherals Summary#UART|UART3]] | Yes, default configuration | No | No|-| [[Peripherals Summary#UART|UART4]] | No | Yes, not default configuration(disable: GPIO_64 and GPMC_WAIT3) | No|-| [[Peripherals Summary#GPIO|GPIO]] | Yes, default configuration | Yes, default configuration | Yes, default configuration|-| [[Peripherals Summary#SPI|McSPI1]] | No | Yes, default configuration | No|-| [[Peripherals Summary#SPI|McSPI2]] | No | No | No|-| [[Peripherals Summary#SPI|McSPI3]] | 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]] | Yes, not default configuration (disable UART2) | No | No|-| [[Peripherals Summary#BSP|McBSP4]] | No | Yes, not default configuration (disable GPMCs) | No|-| [[Peripherals Summary#BSP|McBSP5]] | No | Yes, not default configuration (disable GPIOs) | No|-| [[Peripherals Summary#MMC|MMC1]] | 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|} [[Category:Work_in_progress]][[Category:Peripherals]]