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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:
->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):
->WAKEUPENABLE: Enable wake-up detection on input. It is also the off mode input enable value.<br> ->WAKEUPEVENT: Wake-up event status for the pin.'''<br>''' NOTE: Off mode can be configured like pin output with a HIGH or LOW value or pin input with wake-up detection feature.
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=== Mode selection ===
The next table shows all capabilities.<br>
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'''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 ===
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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. 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> === 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 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. 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]]. [http://www.ti.com/general/docs/lit/getliterature.tsp?literatureNumber=spruf98v&fileType=pdf More information] about mux. = Feedback and Contributing = At any point, if you see a mistake you can contribute to this How-To. = Available peripherals on external connector = The next tables show you all the mux capabilities: === J990 connector === -There are some peripherals than can be connected to J990 like mm3 and camera, but is not used in this how-to. -High Speed USB 3 is only available on Omap 3530 in the next pads: 3: HSUSB3_TLL_NXT<br> 4: HSUSB3_TLL_D4<br> 5: HSUSB3_TLL_DIR <br> 6: HSUSB3_TLL_D6<br> 7: HSUSB3_TLL_STP<br> 8: HSUSB3_TLL_D7 <br> 10: HSUSB3_TLL_D5 <br> {| cellspacing="1" cellpadding="1" border="1" align="JUSTIFY" style="width: 960px; height: 1463px;"|-| Pad: | Connect to: | Default peripheral (mode=0) | Default function: | Other available peripherals: | style="text-align: left;" | Share with:|-| 1 | VIO 1V8 | - | Power 1v8 | - | -<br>|-| 2 | DC 5V | - | Power 5v | - | -<br>|-| 3 | MMC2_DAT7 | MMC2_DAT7 | Reset Wlan | MMC2_CLKIN(mode=1)
{| <div aligncellspacing="JUSTIFY1" cellpadding=">'''Bluethoot1" border="1" style="width: '''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.'''Omap933px; height: '''protect Omap pad if you don't use it.'''(1)'''<br> </div>409px;"
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| 9 <br> | MMC2_DAT4 [[Connectors Summary#J990_connector|J990]] | MMC2_DAT4 [[Connectors Summary#J960_connector|J960]] | - [[Connectors Summary#J970_connector|J970]] | [[Connectors Summary#J400_connector|J400]] MMC_DIR_DAT0(mode=1) MMC3_DAT0(mode=3) GPIO136(mode=4) | [[Connectors Summary#JC30_connector|JC30]] | [[Connectors Summary#JA42_connector|JA42]] | <div align="JUSTIFY">'''Wlan: '''Protect Wlan if you don' use it. See MMC2_DAT7 pad.</div> <div align="JUSTIFY">'''Omap: '''protect Omap pad if you don't use it.'''(1)'''</div>[[Connectors Summary#JA41_connector|JA41]]
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| 11 [[Peripherals Summary#UART|UART1]] | MMC2_DAT3 No | MMC2_DAT3 Yes, not default configuration ([[Mux instructions#UART1_in_J960|disable RS485]]) | Transfer data between Omap and Wlan No | No McSPI3_CS0(mode=1) | No | No GPIO_135| Yes, not default configuration (mode=4) [[Mux_instructions#TFP410| <div align="JUSTIFY">'''Wlan: '''Protect Wlan if you don' use it. See MMC2_DAT7 pad.</div> <div align="JUSTIFY">'''Omap: '''protect Omap pad if you don't use it.'''(1disable DVI]])'''</div>
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| 13 [[Peripherals Summary#UART| MMC2_DAT2 UART2]] | MMC2_DAT2 Yes, not default configuration ([[How to set up UART2 in J990| Transfer data between Omap and Wlan disable Bluetooth]])
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| <div align="JUSTIFY">'''Wlan: '''Protect Wlan if you don' use it. See MMC2_DAT7 pad.</div> <div align="JUSTIFY">'''Omap: '''protect Omap pad if you don't use it.'''(1)'''</div>No |-No | 15 No | MMC2_DAT1 No | MMC2_DAT1 | Transfer data between Omap and Wlan | GPIO_133(mode=4) | <div align="JUSTIFY">'''Wlan: '''Protect Wlan if you don' use it. See MMC2_DAT7 pad.</div> <div align="JUSTIFY">'''Omap: '''protect Omap pad if you don't use it.'''(1)'''</div>No
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| 17 [[Peripherals Summary#UART|UART3]] | MMC2_DAT0 No | MMC2_DAT0 Yes, default configuration ([[Mux instructions#UART3_in_J960|Serial debug]]) | Transfer data between Omap and Wlan No | No McSPI3_SOMI(mode=1) | No | No GPIO_132| Yes, not default configuration (mode=4) [[Mux_instructions#TFP410| <div align="JUSTIFY">'''Wlan: '''Protect Wlan if you don' use it. See MMC2_DAT7 pad.</div> <div align="JUSTIFY">'''Omap: '''protect Omap pad if you don't use it.'''(1disable DVI]])'''</div>
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| 19 [[Peripherals Summary#UART|UART4]] | MMC2_CMD No | MMC2_CMD No | Control Wire for bus MMC2 (Wlan) No | No McSPI3_SIMO(mode=1) GPIO_131(mode=4) | No | No | <div align="JUSTIFY">'''Wlan: '''Protect Wlan if you don' use it. See MMC2_DAT7 pad.</div> <div align="JUSTIFY">'''Omap: '''protect Omap pad if you don't use it.'''(1)'''</div>No
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| 21 [[Peripherals Summary#GPIO| MMC2_CLK0 | MMC2_CLK | Clock for MMC2 (Wlan) GPIO]]
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| 4 [[Peripherals Summary#SPI|McSPI1]] | MCBSP3_DX No | MCBSP3_DX No | Transmitted serial Data (Bluethoot audio) No | No UART2_CTS(mode=1) GPIO_140(mode=4) | No | Yes, default configuration | <div align="JUSTIFY">'''TPS65950:''' disable it via kernel '''(2) '''If you don't use it.</div>No
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| 6 [[Peripherals Summary#SPI|McSPI2]] | MCBSP3_CLKX No | MCBSP3_CLKX No | Transmitted serial Clock (Bluethoot audio) No | No UART2_TX(mode=1) GPIO_142(mode=4) | No | No | <div align="JUSTIFY">'''Bluethoot: '''Protect Bluethoot if you don' use it. See MMC2_DAT5 pad.</div> <div align="JUSTIFY"><br> </div> <div align="JUSTIFY">'''TPS65950:''' disable it via kernel '''(2) '''If you don't use it.</div>No
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| 8 [[Peripherals Summary#SPI| MCBSP3_FSX | MCBSP3_FSX | Transmited Frame Syncronisation (Bluethoot audio) McSPI3]]
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| 10 [[Peripherals Summary#SPI| MCBSP3_DR McSPI4]] | MCBSP3_DR Yes, not default configuration ([[Mux instructions#GPIO_in_J990| Received Serial Data (Bluethoot audiodisable GPIOs]]) | No UART2_RTS(mode=1) | No | No GPIO_141(mode=4) | No | No | <div align="JUSTIFY">'''TPS65950:''' disable it via kernel '''(2) '''If you don't use it.</div>No
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| 12 [[Peripherals Summary#BSP| MCBSP1_DX McBSP1]] | MCBSP1_DX Yes, not default configuration ([[Mux instructions#GPIO_in_J990| Transmited serial Data (not useddisable GPIOs]]) | No McSPI4_SIMO(mode=1) | No | No McBSP3_DX(mode=2) GPIO_158(mode=4) | No | No | -<br>No
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| 14 [[Peripherals Summary#BSP|McBSP2]] | MCBSP1_CLKX No | MCBSP1_CLKX No | Transmited serial clock (not used) No | No McBSP3_CLKX(mode=2)<br> GPIO_162(mode=4) | No | No | -<br>No
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| 16 [[Peripherals Summary#BSP| MCBSP1_FSX McBSP3]] | MCBSP1_FSX Yes, default configuration ([[Mux instructions#TP65950_PCM_VSP| Transmited Frame Syncronization (not usedBluetooth audio]]) | No McSPI4_CS0(mode=1) | No | No McBSP3_FSX(mode=2) GPIO_161(mode=4) | No | No | -<br>No
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| 18 [[Peripherals Summary#BSP|McBSP4]] | MCBSP1_DR No | MCBSP1_DR No | Received Serial Data (not used) No | No McSPI4_SOMI(mode=1) | No McBSP3_DR| Yes, not default configuration (mode=2) GPIO_159(mode=4[[Mux instructions#GPIO_in_J990|disable GPIOs]]) | -<br>No
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| 20 [[Peripherals Summary#BSP|McBSP5]] | MCBSP1_CLKR No | MCBSP1_CLKR No | Received Clock (not used) No | No GPIO_156(mode=4)<br> | No | No | -<br>No
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| 22 [[Peripherals Summary#MMC|MMC1]] | MCBSP1_FSR No | MCBSP1_FSR No | Received frame syncronization (not used) No | No GPIO_157(mode=4)<br> | No | No | -<br>No
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| 23 [[Peripherals Summary#MMC|MMC2]] | I2C2_SDA Yes, default configuration ([[Mux instructions#WIFI|WIFI]]) | I2C2_SDA No | I2C Data No | No GPIO_183(mode=4)<br> | No | No | <div align="JUSTIFY">'''Cam connector:''' Check and RC14 is not welded or don't use it.<br></div>No
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| 24 [[Peripherals Summary#MMC|MMC3]] | I2C2_SCL No | I2C2_SCL No | I2C Clock No | No GPIO_168(mode=4)<br> | No | No | '''Cam connector:''' Check and RC13 is not welded or don't use it.No
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| 25 [[Peripherals Summary#I2C|I2C1]] | No | No | REGEN No | - No | Master/Slave control power TPS65950<br> No | - No | -<br>No
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| 26 [[Peripherals Summary#I2C|I2C2]] | Yes, default configuration | No | nRESET No | - No | Read Reset Omap No, [[Connectors Summary#JC30_connector|via hardware]] | - No | -<br>No
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| 27 [[Peripherals Summary#I2C|I2C3]] | No | No | GND No | - No | GND No | - No | -<br>Yes, default configuration (DVI)
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| 28 [[Peripherals Summary#I2C|I2C4]] | No | No | GND No | - No | GND No | - No | -<br>No
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| [[Connectors Summary#J1_connector|J1]]
| [[Connectors Summary#J4_connector|J4]]
| [[Connectors Summary#J5_connector|J5]]
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| 2 [[Peripherals Summary#UART| RS232_RX2 UART1]] | UART3_RX Yes, not default configuration (disable DSS) | UART2_RX Yes, default configuration | -<br> | Kernel console params'''(4)'''<br>No
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| 3 [[Peripherals Summary#UART| RS232_TX2 UART2]] | UART3_TX Yes, not default configuration(enable: TX and RX) | UART2_TX No | -<br> | Kernel console params'''(4)'''<br>No
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| 4 | - [[Peripherals Summary#UART| - UART3]] | - Yes, default configuration | -<br> No | -<br>No
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| 5 | GND [[Peripherals Summary#UART| - UART4]] | - No | -<br> Yes, not default configuration(disable: GPIO_64 and GPMC_WAIT3) | -<br>No
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| 6 | GND [[Peripherals Summary#GPIO| - GPIO]] | - Yes, default configuration | -<br> Yes, default configuration | -<br>Yes, default configuration
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| 7 | - [[Peripherals Summary#SPI| - McSPI1]] | - No | -<br> Yes, default configuration | -<br>No
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| 8 [[Peripherals Summary#SPI| RS232_TX1 | UART1_TX | UART3_TX | RS485 interface'''(5)'''<br> | -<br>|-| 9 | RS232_RX1 | UART1_RX | UART3_RX | RS485 interface'''(5)'''<br> | -<br>|-| 10 | - | - | - | -<br> McSPI2]] | -<br>No |} <br> - Other peripherals can be configured via hardware, placing/replacing some resistances. See IGEPv2 Schematic for more information. '''(4):''' To set other functionalities to UART3 (/dev/ttyS2) edit igep.ini file: Search line: <pre>console=ttyS2,115200n8</pre> Replace by: <pre>; console=ttyS2,115200n8</pre> '''(5): '''Allows to use UART1 as RS232 instead of EI485, edit igep.ini:<br> Search line: <pre>board.ei485=yes</pre> Replace by: <pre>board.ei485=no</pre> === J400 connector === J400 is used to JTAG (Joint Test Action Group). JTAG is a standardized serial protocol widely used in printed circuit boards. Its main functions are:<br> -Debug the software of an embedded system directly <br>-Storing firmware<br> -Boundary scan testing More information: [http://es.wikipedia.org/wiki/JTAG http://es.wikipedia.org/wiki/JTAG]. Only Pad 13 and 14 have mux capabilities, for example you can use them like GPIO(mode=4). More information in IGEPv2 Schematic.<br> === J970 connector === This connector don't have mux capabilities. J970 is used to implement a keypad. It is controlled by TPS65950, this method avoid reduce Omap proces capabilities. TPS65950 send via I2C1 all the interrupt request. Their characteristics are:<br> - Can handle up to 8 x 8 keypads, IGEPv2 can handle up to 4 x 4 keypads.<br>- Optionally, you can decode via Omap software.<br>- Event detection on key press and key release.<br>- Multikey press detection, can detect up 2 keys at the same time.<br>- Long-key detection on prolonged key press.<br>- Programmable time-out on permanent key press or after keypad release. More information in TPS65950 datasheets.<br> === JC30 connector === JC30 is used to connect a camera for capture video or image. Omap have the processing capability to connect RAW image-sensor modules via this connector. There are some peripherals than can be connected to JC30 like like CAM, SSI and CSI, but is not used in this how-to. GPIO are the default peripheral.<br> Before use this connector be careful at these points: - Pad 1 can be used to power down wifi module if RD41 is short circuit, replace RD42 for this porpouse.<br>- Pad 2 can be used to reset wifi module if RD43 is short circuit, replace RD44 for this porpouse.<br>- Pad 21 can be connected to I2C2_SCL, that wire is shared with J990 connector and I2C2_SCL peripheral. Placing/replacing RC13 for tis porpouse.<br>- Pad 22 can be connected to I2C2_SDA, that wire is shared with J990 connector and I2C2_SDA peripheral. Placing/replacing RC14 for tis porpouse. === JA42 connector === JA42 is used for DVI (Digital Video Interface) control part, TouchScreen control and SPI1.<br> -There are some peripherals than can be connected to JA42 like MM3, MM2, SSI, USB and HW_DBG, but is not used in this how-to. Some pads have mux capabilities: No {| cellspacing="1" cellpadding="1" border="1" align="JUSTIFY" style="width: 804px; height: 343px;"No
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| Pad: [[Peripherals Summary#SPI| Connect to: McSPI3]] | Default peripheral Yes, not default configuration (mode=0disable DSS) | Default function: | Other available peripherals: No | style="text-align: left;" | Share with:No
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| 1 | VIO 1V8 [[Peripherals Summary#SPI| - McSPI4]] | Power 1v8 No | - No | -<br>No
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| 2 [[Peripherals Summary#BSP| SYS_BOOT5 McBSP1]] | SYS_BOOT5<br> No | Omap boot config | MMC2_DIR_DAT(mode=1) GPIO_7 (mode=4) No | -<br>No
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| 3 | DC_5V [[Peripherals Summary#BSP| - McBSP2]] | Power 5v No | - No | <div align="JUSTIFY">-<br></div>No
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| 4 | GND [[Peripherals Summary#BSP| - McBSP3]] | GND Yes, not default configuration (disable UART2) | - No | <div align="JUSTIFY"><br></div> <div align="JUSTIFY">-<br></div>No
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| 5 [[Peripherals Summary#BSP| SYS_BOOT0 McBSP4]] | SYS_BOOT0<br> No | Omap boot config | GPIO_2 Yes, not default configuration (mode=4disable GPMCs) | <div align="JUSTIFY"><br> -<br> </div>No
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| 6 [[Peripherals Summary#BSP| SYS_BOOT1 McBSP5]] | SYS_BOOT1<br> No | Omap boot config<br> | GPIO_3 Yes, not default configuration (mode=4disable GPIOs) | <div align="JUSTIFY">-<br></div> <div align="JUSTIFY"><br></div>No
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| 7 [[Peripherals Summary#MMC| DVI_VSYNC MMC1]] | DSS_VSYNC No | LCD vertical sync (Expansion)<br> | GPIO_68(mode=4) No | <div align="JUSTIFY"><br></div> <div align="JUSTIFY">TFP410 '''(6)'''<br></div>No
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| 8 [[Peripherals Summary#MMC| DVI_HSYNC MMC2]] | DSS_HSYNC No | LCD Horitzontal sync (Expansion) | GPIO_67 (mode=4)<br> No | <div align="JUSTIFY"><br></div> <div align="JUSTIFY"><div align="JUSTIFY">TFP410 '''(6)'''<br></div></div>No
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| 9 [[Peripherals Summary#MMC| DVI_ACBIAS MMC3]] | DSS_ACBIAS No | LCD Control (Expansion) | GPIO_133(mode=4) No | <div align="JUSTIFY"><br></div> <div align="JUSTIFY"><div align="JUSTIFY">TFP410 '''Yes, not default configuration (6disable GPIOs)'''<br></div></div>
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| 10 | DVI_PUP [[Peripherals Summary#I2C| - I2C1]] | Control signal for DVI controler (Expansion) No | - No | <div align="JUSTIFY"><br></div> <div align="JUSTIFY">TFP410 '''(6)'''</div>No
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| 11 [[Peripherals Summary#I2C| DVI_PCLK I2C2]] | DSS_PCLK No | LCD clock (Expansion) | GPIO_66 (mode=4)<br> No | <div align="JUSTIFY"><br></div> <div align="JUSTIFY">TFP410 '''(6)'''</div>No
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| 12 | TS_nPEN_IRQ [[Peripherals Summary#I2C| McSPI1_CS1 I2C3]] | Touchscreen control Yes, default configuration (ExpansionJ5) | No MMC3_CMD| Yes, default configuration (mode=3J1) GPIO_175 (mode=4) | <div align="JUSTIFY">-<br></div> <div align="JUSTIFY"><br></div>
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| 13 | LCD_QVGA/nVGA | McBSP4_DX | Touchscreen control (Expansion) | GPIO_154 (mode=4)<br> | <div align="JUSTIFY">-<br></div>|-| 14 | LCD_ENVDD | McBSP4_DR | Touchscreen control (Expansion) | GPIO_153 (mode=4)<br> | -<br>|-| 15 | LCD_RESB | McBSP4_FSX | Touchscreen control (Expansion) | GPIO_155 (mode=4)<br> | <div align="JUSTIFY"><br></div> <div align="JUSTIFY">-<br> </div> <div align="JUSTIFY"><br></div>|-| 16 | LCD_INI [[Peripherals Summary#I2C| McBSP4_CLKX I2C4]] | Touchscreen control (Expansion) No | GPIO_152 (mode=4)<br> | <div align="JUSTIFY">-<br></div>|-| 17 | MCSPI1_CLK | McSPI1_CLK<br> | Touchscreen control (Expansion) | GPIO_171 (mode=4) | -<br>|-| 18 | MCSPI1_SIMO | McSPI1_SIMO | Touchscreen control (Expansion) | GPIO_172 (mode=4) | -<br>|-| 19 | MCSPI1_CS0 | McSPI1_CS0 | Touchscreen control (Expansion) | GPIO_174 (mode=4) | -<br>|-| 20 | MCSPI1_SOMI | McSPI1_SOMI | Touchscreen control (Expansion) | GPIO_173 (mode=4) No | -<br>No
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