RPi BCM2835 GPIOs - Revision history

AndrewS: /* BCM2835 GPIO functions */ Crossed out outdated info

2013-02-22T03:00:59Z

‎BCM2835 GPIO functions: Crossed out outdated info

BerryBerry: /* BCM2835 GPIO functions */

2012-12-06T10:35:45Z

‎BCM2835 GPIO functions

AndrewS at 01:58, 30 October 2012

2012-10-30T01:58:44Z

AndrewS: /* BCM2835 GPIO functions */ Added new columns for the connections on Rev2.0 boards

2012-10-29T19:50:58Z

‎BCM2835 GPIO functions: Added new columns for the connections on Rev2.0 boards

Show changes

AndrewS: Clarify that the signal names and connections are for the Rev1.0 board

2012-10-29T00:30:33Z

Clarify that the signal names and connections are for the Rev1.0 board

AndrewS at 01:13, 24 October 2012

2012-10-24T01:13:07Z

SimonArlott: The interal GPIOs are all set to ALT3 on power up

2012-05-19T13:57:01Z

The interal GPIOs are all set to ALT3 on power up

AndrewS: Table listing all the BCM2835 GPIO pins, and how these relate to the RaspberryPi

2012-04-28T16:14:54Z

Table listing all the BCM2835 GPIO pins, and how these relate to the RaspberryPi

New page

[[Category: RaspberryPi]]

Back to [[RPi_Low-level_peripherals]]

= BCM2835 GPIO functions =

This is a wiki-fied copy of Table 6-31 from the BCM2835 [http://www.raspberrypi.org/wp-content/uploads/2012/02/BCM2835-ARM-Peripherals.pdf datasheet] including any relevant [[BCM2835_datasheet_errata|errata]], with a couple of extra columns, all nicely hyperlinked together and cross-referenced so that clicking on a function name will automatically take you to the description of that function.
Any GPIOs that aren't [[RPi_BCM2835_Pinout|connected]] on the RaspberryPi Model B revision 1.0 circuit board are <del>crossed out</del>, and the GPIOs available on the [[Rpi_Low-level_peripherals|GPIO Connector (P1)]] are in '''bold''', with their default function (according to the [http://www.raspberrypi.org/wp-content/uploads/2012/04/Raspberry-Pi-Schematics-R1.0.pdf schematics]) in '''''bold italics'''''.

GPIO Pins Alternative Function Assignment
{| border="1"
! style="background-color:yellow;" | !! style="background-color:yellow;" | Pull !! style="background-color:yellow;" | ALT0 !! style="background-color:yellow;" | ALT1 !! style="background-color:yellow;" | ALT2 !! style="background-color:yellow;" | ALT3 !! style="background-color:yellow;" | ALT4 !! style="background-color:yellow;" | ALT5 !! style="background-color:yellow;" | RPi [[RPi_BCM2835_Signals|signal name]] !! style="background-color:yellow;" | RPi [[Rpi_Low-level_peripherals|connection]]
|-
| <div id="GPIO0">'''GPIO0'''</div> || High || style="background-color:orange;" | '''''[[#SDA0|SDA0]]''''' || style="background-color:royalblue;" | [[#SAx|SA5]] || style="background-color:darkolivegreen" | <reserved> || || || || SDA0 || style="background-color:cyan;" | P1-03
|-
| <div id="GPIO1">'''GPIO1'''</div> || High || style="background-color:orange;" | '''''[[#SCL0|SCL0]]''''' || style="background-color:royalblue;" | [[#SAx|SA4]] || style="background-color:darkolivegreen" | <reserved> || || || || SCL0 || style="background-color:cyan;" | P1-05
|-
| <div id="GPIO2">GPIO2</div> || High || style="background-color:magenta;" | [[#SDA1|SDA1]] || style="background-color:royalblue;" | [[#SAx|SA3]] || style="background-color:darkolivegreen" | <reserved> || || || || SDA1 || S5-14
|-
| <div id="GPIO3">GPIO3</div> || High || style="background-color:magenta;" | [[#SCL1|SCL1]] || style="background-color:royalblue;" | [[#SAx|SA2]] || style="background-color:darkolivegreen" | <reserved> || || || || SCL1 || S5-13
|-
| <div id="GPIO4">'''GPIO4'''</div> || High || style="background-color:turquoise;" | '''''[[#GPCLK0|GPCLK0]]''''' || style="background-color:royalblue;" | [[#SAx|SA1]] || style="background-color:darkolivegreen" | <reserved> || || || style="background-color:silver" | [[#ARM_TDI|ARM_TDI]] || GPIO_GCLK || style="background-color:lime;" | P1-07
|-
| <div id="GPIO5">GPIO5</div> || High || style="background-color:turquoise;" | [[#GPCLK1|GPCLK1]] || style="background-color:royalblue;" | [[#SAx|SA0]] || style="background-color:darkolivegreen" | <reserved> || || || style="background-color:silver" | [[#ARM_TDO|ARM_TDO]] || CAM_CLK || S5-12
|-
| <div id="GPIO6">GPIO6</div> || High || style="background-color:turquoise;" | [[#GPCLK2|GPCLK2]] || style="background-color:royalblue;" | [[#SOE_N|SOE_N / SE]] || style="background-color:darkolivegreen" | <reserved> || || || style="background-color:silver" | [[#ARM_RTCK|ARM_RTCK]] || LAN_RUN || IC3-12
|-
| <div id="GPIO7">'''GPIO7'''</div> || High || style="background-color:plum;" | '''''[[#SPI0_CE1_N|SPI0_CE1_N]]''''' || style="background-color:royalblue;" | [[#SWE_N|SWE_N / SRW_N]] || style="background-color:darkolivegreen" | <reserved> || || || || SPI_CE1_N || style="background-color:purple;color:white;" | P1-26
|-
| <div id="GPIO8">'''GPIO8'''</div> || High || style="background-color:plum;" | '''''[[#SPI0_CE0_N|SPI0_CE0_N]]''''' || style="background-color:royalblue;" | [[#SDx|SD0]] || style="background-color:darkolivegreen" | <reserved> || || || || SPI_CE0_N || style="background-color:purple;color:white;" | P1-24
|-
| <div id="GPIO9">'''GPIO9'''</div> || Low || style="background-color:plum;" | '''''[[#SPI0_MISO|SPI0_MISO]]''''' || style="background-color:royalblue;" | [[#SDx|SD1]] || style="background-color:darkolivegreen" | <reserved> || || || || SPI_MISO || style="background-color:purple;color:white;" | P1-21
|-
| <div id="GPIO10">'''GPIO10'''</div> || Low || style="background-color:plum;" | '''''[[#SPI0_MOSI|SPI0_MOSI]]''''' || style="background-color:royalblue;" | [[#SDx|SD2]] || style="background-color:darkolivegreen" | <reserved> || || || || SPI_MOSI || style="background-color:purple;color:white;" | P1-19
|-
| <div id="GPIO11">'''GPIO11'''</div> || Low || style="background-color:plum;" | '''''[[#SPI0_SCLK|SPI0_SCLK]]''''' || style="background-color:royalblue;" | [[#SDx|SD3]] || style="background-color:darkolivegreen" | <reserved> || || || || SPI_SCLK || style="background-color:purple;color:white;" | P1-23
|-
| <div id="GPIO12"><del>GPIO12</del></div> || Low || style="background-color:lightblue;" | [[#PWMx|PWM0]] || style="background-color:royalblue;" | [[#SDx|SD4]] || style="background-color:darkolivegreen" | <reserved> || || || style="background-color:silver" | [[#ARM_TMS|ARM_TMS]] || nc ||
|-
| <div id="GPIO13"><del>GPIO13</del></div> || Low || style="background-color:lightblue;" | [[#PWMx|PWM1]] || style="background-color:royalblue;" | [[#SDx|SD5]] || style="background-color:darkolivegreen" | <reserved> || || || style="background-color:silver" | [[#ARM_TCK|ARM_TCK]] || nc ||
|-
| <div id="GPIO14">'''GPIO14'''</div> || Low || style="background-color:red;" | '''''[[#TXD0|TXD0]]''''' || style="background-color:royalblue;" | [[#SDx|SD6]] || style="background-color:darkolivegreen;" | <reserved> || || || style="background-color:red;" | [[#TXD1|TXD1]] || TXD0 || style="background-color:yellow;" | P1-08
|-
| <div id="GPIO15">'''GPIO15'''</div> || Low || style="background-color:red;" | '''''[[#RXD0|RXD0]]''''' || style="background-color:royalblue;" | [[#SDx|SD7]] || style="background-color:darkolivegreen;" | <reserved> || || || style="background-color:red;" | [[#RXD1|RXD1]] || RXD0 || style="background-color:yellow;" | P1-10
|-
| <div id="GPIO16">GPIO16</div> || Low || style="background-color:darkolivegreen;" | <reserved> || style="background-color:royalblue;" | [[#SDx|SD8]] || style="background-color:darkolivegreen;" | <reserved> || style="background-color:red;" | [[#CTS0|CTS0]] || style="background-color:plum;" | [[#SPI1_CEx_N|SPI1_CE2_N]] || style="background-color:red;" | [[#CTS1|CTS1]] || STATUS_LED_N || D5 (OK LED)
|-
| <div id="GPIO17">'''''GPIO17'''''</div> || Low || style="background-color:darkolivegreen;" | <reserved> || style="background-color:royalblue;" | [[#SDx|SD9]] || style="background-color:darkolivegreen;" | <reserved> || style="background-color:red;" | [[#RTS0|RTS0]] || style="background-color:plum;" | [[#SPI1_CEx_N|SPI1_CE1_N]] || style="background-color:red;" | [[#RTS1|RTS1]] || GPIO_GEN0 || style="background-color:lime;" | P1-11
|-
| <div id="GPIO18">'''''GPIO18'''''</div> || Low || style="background-color:lawngreen;" | [[#PCM_CLK|PCM_CLK]] || style="background-color:royalblue;" | [[#SDx|SD10]] || style="background-color:darkolivegreen;" | <reserved> || style="background-color:maroon;color:white;" | [[#MOSI|BSCSL SDA / MOSI]] || style="background-color:plum;" | [[#SPI1_CEx_N|SPI1_CE0_N]] || style="background-color:lightblue;" | [[#PWMx|PWM0]] || GPIO_GEN1 || style="background-color:lime;" | P1-12
|-
| <div id="GPIO19"><del>GPIO19</del></div> || Low || style="background-color:lawngreen;" | [[#PCM_FS|PCM_FS]] || style="background-color:royalblue;" | [[#SDx|SD11]] || style="background-color:darkolivegreen;" | <reserved> || style="background-color:maroon;color:white;" | [[#SCLK|BSCSL SCL / SCLK]] || style="background-color:plum;" | [[#SPI1_MISO|SPI1_MISO]] || style="background-color:lightblue;" | [[#PWMx|PWM1]] || nc ||
|-
| <div id="GPIO20"><del>GPIO20</del></div> || Low || style="background-color:lawngreen;" | [[#PCM_DIN|PCM_DIN]] || style="background-color:royalblue;" | [[#SDx|SD12]] || style="background-color:darkolivegreen;" | <reserved> || style="background-color:maroon;color:white;" | [[#MISO|BSCSL / MISO]] || style="background-color:plum;" | [[#SPI1_MOSI|SPI1_MOSI]] || style="background-color:turquoise;" | [[#GPCLK0|GPCLK0]] || nc ||
|-
| <div id="GPIO21">'''''GPIO21'''''</div> || Low || style="background-color:lawngreen;" | [[#PCM_DOUT|PCM_DOUT]] || style="background-color:royalblue;" | [[#SDx|SD13]] || style="background-color:darkolivegreen;" | <reserved> || style="background-color:maroon;color:white;" | [[#CE_N|BSCSL / CE_N]] || style="background-color:plum;" | [[#SPI1_SCLK|SPI1_SCLK]] || style="background-color:turquoise;" | [[#GPCLK1|GPCLK1]] || GPIO_GEN2 || style="background-color:lime;" | P1-13
|-
| <div id="GPIO22">'''''GPIO22'''''</div> || Low || style="background-color:darkolivegreen;" | <reserved> || style="background-color:royalblue;" | [[#SDx|SD14]] || style="background-color:darkolivegreen;" | <reserved> || style="background-color:turquoise;" | SD1_CLK || style="background-color:silver;" | [[#ARM_TRST|ARM_TRST]] || || GPIO_GEN3 || style="background-color:lime;" | P1-15
|-
| <div id="GPIO23">'''''GPIO23'''''</div> || Low || style="background-color:darkolivegreen;" | <reserved> || style="background-color:royalblue;" | [[#SDx|SD15]] || style="background-color:darkolivegreen;" | <reserved> || style="background-color:turquoise;" | SD1_CMD || style="background-color:silver;" | [[#ARM_RTCK|ARM_RTCK]] || || GPIO_GEN4 || style="background-color:lime;" | P1-16
|-
| <div id="GPIO24">'''''GPIO24'''''</div> || Low || style="background-color:darkolivegreen;" | <reserved> || style="background-color:royalblue;" | [[#SDx|SD16]] || style="background-color:darkolivegreen;" | <reserved> || style="background-color:turquoise;" | SD1_DAT0 || style="background-color:silver;" | [[#ARM_TDO|ARM_TDO]] || || GPIO_GEN5 || style="background-color:lime;" | P1-18
|-
| <div id="GPIO25">'''''GPIO25'''''</div> || Low || style="background-color:darkolivegreen;" | <reserved> || style="background-color:royalblue;" | [[#SDx|SD17]] || style="background-color:darkolivegreen;" | <reserved> || style="background-color:turquoise;" | SD1_DAT1 || style="background-color:silver;" | [[#ARM_TCK|ARM_TCK]] || || GPIO_GEN6 || style="background-color:lime;" | P1-22
|-
| <div id="GPIO26"><del>GPIO26</del></div> || Low || style="background-color:darkolivegreen;" | <reserved> || style="background-color:darkolivegreen;" | <reserved> || style="background-color:darkolivegreen;" | <reserved> || style="background-color:turquoise;" | SD1_DAT2 || style="background-color:silver;" | [[#ARM_TDI|ARM_TDI]] || || nc ||
|-
| <div id="GPIO27">GPIO27</div> || Low || style="background-color:darkolivegreen;" | <reserved> || style="background-color:darkolivegreen;" | <reserved> || style="background-color:darkolivegreen;" | <reserved> || style="background-color:turquoise;" | SD1_DAT3 || style="background-color:silver;" | [[#ARM_TMS|ARM_TMS]] || || CAM_GPIO || S5-11
|-
| <div id="GPIO28">GPIO28</div> || - || style="background-color:orange;" | [[#SDA0|SDA0]] || style="background-color:royalblue;" | [[#SAx|SA5]] || style="background-color:lawngreen;" | [[#PCM_CLK|PCM_CLK]] || style="background-color:darkolivegreen;" | <reserved> || || || CONFIG0 || R10 / R8
|-
| <div id="GPIO29">GPIO29</div> || - || style="background-color:orange;" | [[#SCL0|SCL0]] || style="background-color:royalblue;" | [[#SAx|SA4]] || style="background-color:lawngreen;" | [[#PCM_FS|PCM_FS]] || style="background-color:darkolivegreen;" | <reserved> || || || CONFIG1 || R9 / R7
|-
| <div id="GPIO30">GPIO30</div> || Low || style="background-color:darkolivegreen;" | <reserved> || style="background-color:royalblue;" | [[#SAx|SA3]] || style="background-color:lawngreen;" | [[#PCM_DIN|PCM_DIN]] || style="background-color:red;" | [[#CTS0|CTS0]] || || style="background-color:red;" | [[#CTS1|CTS1]] || CONFIG2 || R6 / R4
|-
| <div id="GPIO31">GPIO31</div> || Low || style="background-color:darkolivegreen;" | <reserved> || style="background-color:royalblue;" | [[#SAx|SA2]] || style="background-color:lawngreen;" | [[#PCM_DOUT|PCM_DOUT]] || style="background-color:red;" | [[#RTS0|RTS0]] || || style="background-color:red;" | [[#RTS1|RTS1]] || CONFIG3 || R5 / R3
|-
| <div id="GPIO32"><del>GPIO32</del></div> || Low || style="background-color:turquoise;" | [[#GPCLK0|GPCLK0]] || style="background-color:royalblue;" | [[#SAx|SA1]] || style="background-color:darkolivegreen;" | <reserved> || style="background-color:red;" | [[#TXD0|TXD0]] || || style="background-color:red;" | [[#TXD1|TXD1]] || nc ||
|-
| <div id="GPIO33"><del>GPIO33</del></div> || Low || style="background-color:darkolivegreen;" | <reserved> || style="background-color:royalblue;" | [[#SAx|SA0]] || style="background-color:darkolivegreen;" | <reserved> || style="background-color:red;" | [[#RXD0|RXD0]] || || style="background-color:red;" | [[#RXD1|RXD1]] || nc ||
|-
| <div id="GPIO34"><del>GPIO34</del></div> || High || style="background-color:turquoise;" | [[#GPCLK0|GPCLK0]] || style="background-color:royalblue;" | [[#SOE_N|SOE_N / SE]] || style="background-color:darkolivegreen;" | <reserved> || style="background-color:darkolivegreen;" | <reserved> || || || nc ||
|-
| <div id="GPIO35"><del>GPIO35</del></div> || High || style="background-color:plum;" | [[#SPI0_CE1_N|SPI0_CE1_N]] || style="background-color:royalblue;" | [[#SWE_N|SWE_N / SRW_N]] || || style="background-color:darkolivegreen;" | <reserved> || || || nc ||
|-
| <div id="GPIO36"><del>GPIO36</del></div> || High || style="background-color:plum;" | [[#SPI0_CE0_N|SPI0_CE0_N]] || style="background-color:royalblue;" | [[#SDx|SD0]] || style="background-color:red;" | [[#TXD0|TXD0]] || style="background-color:darkolivegreen;" | <reserved> || || || nc ||
|-
| <div id="GPIO37"><del>GPIO37</del></div> || Low || style="background-color:plum;" | [[#SPI0_MISO|SPI0_MISO]] || style="background-color:royalblue;" | [[#SDx|SD1]] || style="background-color:red;" | [[#RXD0|RXD0]] || style="background-color:darkolivegreen;" | <reserved> || || || nc ||
|-
| <div id="GPIO38"><del>GPIO38</del></div> || Low || style="background-color:plum;" | [[#SPI0_MOSI|SPI0_MOSI]] || style="background-color:royalblue;" | [[#SDx|SD2]] || style="background-color:red;" | [[#RTS0|RTS0]] || style="background-color:darkolivegreen;" | <reserved> || || || nc ||
|-
| <div id="GPIO39"><del>GPIO39</del></div> || Low || style="background-color:plum;" | [[#SPI0_SCLK|SPI0_SCLK]] || style="background-color:royalblue;" | [[#SDx|SD3]] || style="background-color:red;" | [[#CTS0|CTS0]] || style="background-color:darkolivegreen;" | <reserved> || || || nc ||
|-
| <div id="GPIO40">GPIO40</div> || Low || style="background-color:lightblue;" | [[#PWMx|PWM0]] || style="background-color:royalblue;" | [[#SDx|SD4]] || || style="background-color:darkolivegreen;" | <reserved> || style="background-color:plum;" | [[#SPI2_MISO|SPI2_MISO]] || style="background-color:red;" | [[#TXD1|TXD1]] || PWM0_OUT || R21
|-
| <div id="GPIO41"><del>GPIO41</del></div> || Low || style="background-color:lightblue;" | [[#PWMx|PWM1]] || style="background-color:royalblue;" | [[#SDx|SD5]] || style="background-color:darkolivegreen;" | <reserved> || style="background-color:darkolivegreen;" | <reserved> || style="background-color:plum;" | [[#SPI2_MOSI|SPI2_MOSI]] || style="background-color:red;" | [[#RXD1|RXD1]] || nc ||
|-
| <div id="GPIO42"><del>GPIO42</del></div> || Low || style="background-color:turquoise;" | [[#GPCLK1|GPCLK1]] || style="background-color:royalblue;" | [[#SDx|SD6]] || style="background-color:darkolivegreen;" | <reserved> || style="background-color:darkolivegreen;" | <reserved> || style="background-color:plum;" | [[#SPI2_SCLK|SPI2_SCLK]] || style="background-color:red;" | [[#RTS1|RTS1]] || nc ||
|-
| <div id="GPIO43"><del>GPIO43</del></div> || Low || style="background-color:turquoise;" | [[#GPCLK2|GPCLK2]] || style="background-color:royalblue;" | [[#SDx|SD7]] || style="background-color:darkolivegreen;" | <reserved> || style="background-color:darkolivegreen;" | <reserved> || style="background-color:plum;" | [[#SPI2_CEx_N|SPI2_CE0_N]] || style="background-color:red;" | [[#CTS1|CTS1]] || nc ||
|-
| <div id="GPIO44"><del>GPIO44</del></div> || - || style="background-color:turquoise;" | [[#GPCLK1|GPCLK1]] || style="background-color:orange;" | [[#SDA0|SDA0]] || style="background-color:magenta;" | [[#SDA1|SDA1]] || style="background-color:darkolivegreen;" | <reserved> || style="background-color:plum;" | [[#SPI2_CEx_N|SPI2_CE1_N]] || || nc ||
|-
| <div id="GPIO45">GPIO45</div> || - || style="background-color:lightblue;" | [[#PWMx|PWM1]] || style="background-color:orange;" | [[#SCL0|SCL0]] || style="background-color:magenta;" | [[#SCL1|SCL1]] || style="background-color:darkolivegreen;" | <reserved> || style="background-color:plum;" | [[#SPI2_CEx_N|SPI2_CE2_N]] || || PWM1_OUT || R27
|-
| <div id="GPIO46">GPIO46</div> || High || style="background-color:darkolivegreen;" | <Internal> || || || || || || HDMI_HPD_P || IC1-6
|-
| <div id="GPIO47">GPIO47</div> || High || style="background-color:darkolivegreen;" | <Internal> || || || || || || SD_CARD_DET || S8-10
|-
| <div id="GPIO48">GPIO48</div> || High || style="background-color:darkolivegreen;" | <Internal> || || || || || || SD_CLK_R || R48
|-
| <div id="GPIO49">GPIO49</div> || High || style="background-color:darkolivegreen;" | <Internal> || || || || || || SD_CMD_R || R47
|-
| <div id="GPIO50">GPIO50</div> || High || style="background-color:darkolivegreen;" | <Internal> || || || || || || SD_DATA0_R || R49
|-
| <div id="GPIO51">GPIO51</div> || High || style="background-color:darkolivegreen;" | <Internal> || || || || || || SD_DATA1_R || R50
|-
| <div id="GPIO52">GPIO52</div> || High || style="background-color:darkolivegreen;" | <Internal> || || || || || || SD_DATA2_R || R45
|-
| <div id="GPIO53">GPIO53</div> || High || style="background-color:darkolivegreen;" | <Internal> || || || || || || SD_DATA3_R || R46
|-
! style="background-color:yellow;" | !! style="background-color:yellow;" | Pull !! style="background-color:yellow;" | ALT0 !! style="background-color:yellow;" | ALT1 !! style="background-color:yellow;" | ALT2 !! style="background-color:yellow;" | ALT3 !! style="background-color:yellow;" | ALT4 !! style="background-color:yellow;" | ALT5 !! style="background-color:yellow;" | RPi [[RPi_BCM2835_Signals|signal name]] !! style="background-color:yellow;" | RPi [[Rpi_Low-level_peripherals|connection]]
|}

As in the table above, the GPIOs available on the [[Rpi_Low-level_peripherals|GPIO Connector (P1)]] are in '''bold''', with their default function (according to the [http://www.raspberrypi.org/wp-content/uploads/2012/04/Raspberry-Pi-Schematics-R1.0.pdf schematics]) in '''''bold italics'''''.

Special function legend:
{| border="1"
! style="background-color:powderblue;" | Name !! style="background-color:powderblue;" | Function !! style="background-color:powderblue;" | Datasheet section !! style="background-color:powderblue;" | GPIOs
|-
| style="background-color:orange;" | <div id="SDA0">SDA0</div> || BSC master 0 data line || BSC || '''''[[#GPIO0|GPIO0]]''''' [[#GPIO28|GPIO28]] <del>[[#GPIO44|GPIO44]]</del>
|-
| style="background-color:orange;" | <div id="SCL0">SCL0</div> || BSC master 0 clock line || BSC || '''''[[#GPIO1|GPIO1]]''''' [[#GPIO29|GPIO29]] [[#GPIO45|GPIO45]]
|-
| style="background-color:magenta;" | <div id="SDA1">SDA1</div> || BSC master 1 data line || BSC || [[#GPIO2|GPIO2]] <del>[[#GPIO44|GPIO44]]</del>
|-
| style="background-color:magenta;" | <div id="SCL1">SCL1</div> || BSC master 1 clock line || BSC || [[#GPIO3|GPIO3]] [[#GPIO45|GPIO45]]
|-
| style="background-color:turquoise;" | <div id="GPCLK0">GPCLK0</div> || General purpose Clock 0 || '''<TBD>''' || '''''[[#GPIO4|GPIO4]]''''' <del>[[#GPIO20|GPIO20]]</del> <del>[[#GPIO32|GPIO32]]</del> <del>[[#GPIO34|GPIO34]]</del>
|-
| style="background-color:turquoise;" | <div id="GPCLK1">GPCLK1</div> || General purpose Clock 1 || '''<TBD>''' || [[#GPIO5|GPIO5]] '''[[#GPIO21|GPIO21]]''' <del>[[#GPIO42|GPIO42]]</del> <del>[[#GPIO44|GPIO44]]</del>
|-
| style="background-color:turquoise;" | <div id="GPCLK2">GPCLK2</div> || General purpose Clock 2 || '''<TBD>''' || [[#GPIO6|GPIO6]] <del>[[#GPIO43|GPIO43]]</del>
|-
| style="background-color:plum;" | <div id="SPI0_CE1_N">SPI0_CE1_N</div> || SPI0 Chip select 1 || SPI || '''''[[#GPIO7|GPIO7]]''''' <del>[[#GPIO35|GPIO35]]</del>
|-
| style="background-color:plum;" | <div id="SPI0_CE0_N">SPI0_CE0_N</div> || SPI0 Chip select 0 || SPI || '''''[[#GPIO8|GPIO8]]''''' <del>[[#GPIO36|GPIO36]]</del>
|-
| style="background-color:plum;" | <div id="SPI0_MISO">SPI0_MISO</div> || SPI0 MISO || SPI || '''''[[#GPIO9|GPIO9]]''''' <del>[[#GPIO37|GPIO37]]</del>
|-
| style="background-color:plum;" | <div id="SPI0_MOSI">SPI0_MOSI</div> || SPI0 MOSI || SPI || '''''[[#GPIO10|GPIO10]]''''' <del>[[#GPIO38|GPIO38]]</del>
|-
| style="background-color:plum;" | <div id="SPI0_SCLK">SPI0_SCLK</div> || SPI0 Serial clock || SPI || '''''[[#GPIO11|GPIO11]]''''' <del>[[#GPIO39|GPIO39]]</del>
|-
| style="background-color:lightblue;" | <div id="PWMx">PWMx</div> || Pulse Width Modulator 0..1 || Pulse Width Modulator || PWM0: <del>[[#GPIO12|GPIO12]]</del> '''[[#GPIO18|GPIO18]]''' [[#GPIO40|GPIO40]]<br> PWM1: <del>[[#GPIO13|GPIO13]]</del> <del>[[#GPIO19|GPIO19]]</del> <del>[[#GPIO41|GPIO41]]</del> [[#GPIO45|GPIO45]]
|-
| style="background-color:red;" | <div id="TXD0">TXD0</div> || UART 0 Transmit Data || UART || '''''[[#GPIO14|GPIO14]]''''' <del>[[#GPIO32|GPIO32]]</del> <del>[[#GPIO36|GPIO36]]</del>
|-
| style="background-color:red;" | <div id="RXD0">RXD0</div> || UART 0 Receive Data || UART || '''''[[#GPIO15|GPIO15]]''''' <del>[[#GPIO33|GPIO33]]</del> <del>[[#GPIO37|GPIO37]]</del>
|-
| style="background-color:red;" | <div id="CTS0">CTS0</div> || UART 0 Clear To Send || UART || [[#GPIO16|GPIO16]] [[#GPIO30|GPIO30]] <del>[[#GPIO39|GPIO39]]</del>
|-
| style="background-color:red;" | <div id="RTS0">RTS0</div> || UART 0 Request To Send || UART || '''[[#GPIO17|GPIO17]]''' [[#GPIO31|GPIO31]] <del>[[#GPIO38|GPIO38]]</del>
|-
| style="background-color:lawngreen;" | <div id="PCM_CLK">PCM_CLK</div> || PCM clock || PCM Audio || '''[[#GPIO18|GPIO18]]''' [[#GPIO28|GPIO28]]
|-
| style="background-color:lawngreen;" | <div id="PCM_FS">PCM_FS</div> || PCM Frame Sync || PCM Audio || <del>[[#GPIO19|GPIO19]]</del> [[#GPIO29|GPIO29]]
|-
| style="background-color:lawngreen;" | <div id="PCM_DIN">PCM_DIN</div> || PCM Data in || PCM Audio || <del>[[#GPIO20|GPIO20]]</del> [[#GPIO30|GPIO30]]
|-
| style="background-color:lawngreen;" | <div id="PCM_DOUT">PCM_DOUT</div> || PCM data out || PCM Audio || '''[[#GPIO21|GPIO21]]''' [[#GPIO31|GPIO31]]
|-
| style="background-color:royalblue;color:white;" | <div id="SAx">SAx</div> || Secondary mem Address bus || Secondary Memory Interface || many
|-
| style="background-color:royalblue;color:white;" | <div id="SOE_N">SOE_N / SE</div> || Secondary mem. Controls || Secondary Memory Interface || [[#GPIO6|GPIO6]] <del>[[#GPIO34|GPIO34]]</del>
|-
| style="background-color:royalblue;color:white;" | <div id="SWE_N">SWE_N / SRW_N</div> || Secondary mem. Controls || Secondary Memory Interface || '''[[#GPIO7|GPIO7]]''' <del>[[#GPIO35|GPIO35]]</del>
|-
| style="background-color:royalblue;color:white;" | <div id="SDx">SDx</div> || Secondary mem. data bus || Secondary Memory Interface || many
|-
| style="background-color:maroon;color:white;" | <div id="MOSI">BSCSL SDA / MOSI</div> || BSC slave Data, SPI slave MOSI || BSC/SPI slave || '''[[#GPIO18|GPIO18]]'''
|-
| style="background-color:maroon;color:white;" | <div id="SCLK">BSCSL SCL / SCLK</div> || BSC slave Clock, SPI slave clock || BSC/SPI slave || <del>[[#GPIO19|GPIO19]]</del>
|-
| style="background-color:maroon;color:white;" | <div id="MISO">BSCSL - / MISO</div> || BSC <not used>, SPI MISO || BSC/SPI slave || <del>[[#GPIO20|GPIO20]]</del>
|-
| style="background-color:maroon;color:white;" | <div id="CE_N">BSCSL - / CE_N</div> || BSC <not used>, SPI CSn || BSC/SPI slave || '''[[#GPIO21|GPIO21]]'''
|-
| style="background-color:plum;" | <div id="SPI1_CEx_N">SPI1_CEx_N</div> || SPI1 Chip select 0-2 || Auxiliary I/O || SPI1_CE0_N: '''[[#GPIO18|GPIO18]]'''<br> SPI1_CE1_N: '''[[#GPIO17|GPIO17]]'''<br> SPI1_CE2_N: [[#GPIO16|GPIO16]]
|-
| style="background-color:plum;" | <div id="SPI1_MISO">SPI1_MISO</div> || SPI1 MISO || Auxiliary I/O || <del>[[#GPIO19|GPIO19]]</del>
|-
| style="background-color:plum;" | <div id="SPI1_MOSI">SPI1_MOSI</div> || SPI1 MOSI || Auxiliary I/O || <del>[[#GPIO20|GPIO20]]</del>
|-
| style="background-color:plum;" | <div id="SPI1_SCLK">SPI1_SCLK</div> || SPI1 Serial clock || Auxiliary I/O || '''[[#GPIO21|GPIO21]]'''
|-
| style="background-color:red;" | <div id="TXD1">TXD1</div> || UART 1 Transmit Data || Auxiliary I/O || '''[[#GPIO14|GPIO14]]''' <del>[[#GPIO32|GPIO32]]</del> [[#GPIO40|GPIO40]]
|-
| style="background-color:red;" | <div id="RXD1">RXD1</div> || UART 1 Receive Data || Auxiliary I/O || '''[[#GPIO15|GPIO15]]''' <del>[[#GPIO33|GPIO33]]</del> <del>[[#GPIO41|GPIO41]]</del>
|-
| style="background-color:red;" | <div id="CTS1">CTS1</div> || UART 1 Clear To Send || Auxiliary I/O || [[#GPIO16|GPIO16]] [[#GPIO30|GPIO30]] <del>[[#GPIO43|GPIO43]]</del>
|-
| style="background-color:red;" | <div id="RTS1">RTS1</div> || UART 1 Request To Send || Auxiliary I/O || '''[[#GPIO17|GPIO17]]''' [[#GPIO31|GPIO31]] <del>[[#GPIO42|GPIO42]]</del>
|-
| style="background-color:plum;" | <div id="SPI2_CEx_N">SPI2_CEx_N</div> || SPI2 Chip select 0-2 || Auxiliary I/O || SPI2_CE0_N: <del>[[#GPIO43|GPIO43]]</del><br> SPI2_CE1_N: <del>[[#GPIO44|GPIO44]]</del><br> SPI2_CE2_N: [[#GPIO45|GPIO45]]
|-
| style="background-color:plum;" | <div id="SPI2_MISO">SPI2_MISO</div> || SPI2 MISO || Auxiliary I/O || [[#GPIO40|GPIO40]]
|-
| style="background-color:plum;" | <div id="SPI2_MOSI">SPI2_MOSI</div> || SPI2 MOSI || Auxiliary I/O || <del>[[#GPIO41|GPIO41]]</del>
|-
| style="background-color:plum;" | <div id="SPI2_SCLK">SPI2_SCLK</div> || SPI2 Serial clock || Auxiliary I/O || <del>[[#GPIO42|GPIO42]]</del>
|-
| style="background-color:silver;" | <div id="ARM_TRST">ARM_TRST</div> || ARM JTAG reset || '''<TBD>''' || '''[[#GPIO22|GPIO22]]'''
|-
| style="background-color:silver;" | <div id="ARM_RTCK">ARM_RTCK</div> || ARM JTAG return clock || '''<TBD>''' || [[#GPIO6|GPIO6]] '''[[#GPIO23|GPIO23]]'''
|-
| style="background-color:silver;" | <div id="ARM_TDO">ARM_TDO</div> || ARM JTAG Data out || '''<TBD>''' || '''[[#GPIO4|GPIO4]]''' '''[[#GPIO24|GPIO24]]'''
|-
| style="background-color:silver;" | <div id="ARM_TCK">ARM_TCK</div> || ARM JTAG Clock || '''<TBD>''' || <del>[[#GPIO13|GPIO13]]</del> '''[[#GPIO25|GPIO25]]'''
|-
| style="background-color:silver;" | <div id="ARM_TDI">ARM_TDI</div> || ARM JTAG Data in || '''<TBD>''' || '''[[#GPIO4|GPIO4]]''' <del>[[#GPIO26|GPIO26]]</del>
|-
| style="background-color:silver;" | <div id="ARM_TMS">ARM_TMS</div> || ARM JTAG Mode select || '''<TBD>''' || <del>[[#GPIO12|GPIO12]]</del> [[#GPIO27|GPIO27]]
|-
! style="background-color:powderblue;" | Name !! style="background-color:powderblue;" | Function !! style="background-color:powderblue;" | Datasheet section !! style="background-color:powderblue;" | GPIOs
|}

@@ Line 125: / Line 125: @@
 |}
 '''Board revision coding'''<BR>
-GPIO 28-31 are brought out, with each pin attached to a voltage divider. These four GPIO's are used to auto detect the revision version, as is indicated in the schematic (sheet to, location 7D). With 10K resistors either mounted or unmounted the pins are either pulled low or high, giving a four bit condition that can be read, with currently only two of the sixteen possible combinations used, one (code '0') for the model A and the other (code '1') for the model B, with codes '2' to 'F' reserved for future use.
+This next paragraph (which I've crossed out) only applies to Rev.1 boards, and even then these GPIOs were apparently never ''actually'' used for board identification!<BR>

← Older revision		Revision as of 10:35, 6 December 2012
Line 124:		Line 124:
	! style="background-color:yellow;" \| !! style="background-color:yellow;" \| Pull !! style="background-color:yellow;" \| ALT0 !! style="background-color:yellow;" \| ALT1 !! style="background-color:yellow;" \| ALT2 !! style="background-color:yellow;" \| ALT3 !! style="background-color:yellow;" \| ALT4 !! style="background-color:yellow;" \| ALT5 !! style="background-color:yellow;" \| RPi [[RPi_BCM2835_Signals_Rev1.0\|Rev1.0 signal name]] !! style="background-color:yellow;" \| RPi [[RPi_BCM2835_Signals_Rev2.0\|Rev2.0 signal name]] !! style="background-color:yellow;" \| RPi Rev1.0 [[Rpi_Low-level_peripherals\|connection]] !! style="background-color:yellow;" \| RPi Rev2.0 [[Rpi_Low-level_peripherals\|connection]]		! style="background-color:yellow;" \| !! style="background-color:yellow;" \| Pull !! style="background-color:yellow;" \| ALT0 !! style="background-color:yellow;" \| ALT1 !! style="background-color:yellow;" \| ALT2 !! style="background-color:yellow;" \| ALT3 !! style="background-color:yellow;" \| ALT4 !! style="background-color:yellow;" \| ALT5 !! style="background-color:yellow;" \| RPi [[RPi_BCM2835_Signals_Rev1.0\|Rev1.0 signal name]] !! style="background-color:yellow;" \| RPi [[RPi_BCM2835_Signals_Rev2.0\|Rev2.0 signal name]] !! style="background-color:yellow;" \| RPi Rev1.0 [[Rpi_Low-level_peripherals\|connection]] !! style="background-color:yellow;" \| RPi Rev2.0 [[Rpi_Low-level_peripherals\|connection]]
	\|}		\|}
		+
		+	'''Board revision coding'''<BR>
		+	GPIO 28-31 are brought out, with each pin attached to a voltage divider. These four GPIO's are used to auto detect the revision version, as is indicated in the schematic (sheet to, location 7D). With 10K resistors either mounted or unmounted the pins are either pulled low or high, giving a four bit condition that can be read, with currently only two of the sixteen possible combinations used, one (code '0') for the model A and the other (code '1') for the model B, with codes '2' to 'F' reserved for future use.

← Older revision		Revision as of 01:13, 24 October 2012
Line 1:		Line 1:
	[[Category: RaspberryPi]]		[[Category: RaspberryPi]]
		+	[[Category: BCM2835]]

	Back to [[RPi_Low-level_peripherals]]		Back to [[RPi_Low-level_peripherals]]

@@ Line 7: / Line 7: @@
 This is a wiki-fied copy of Table 6-31 from the BCM2835 [http://www.raspberrypi.org/wp-content/uploads/2012/02/BCM2835-ARM-Peripherals.pdf datasheet] including any relevant [[BCM2835_datasheet_errata|errata]], with a couple of extra columns, all nicely hyperlinked together and cross-referenced so that clicking on a function name will automatically take you to the description of that function.
-Any GPIOs that aren't [[RPi_BCM2835_Pinout|connected]] on the RaspberryPi Model B revision 1.0 circuit board are <del>crossed out</del>, and the GPIOs available on the [[Rpi_Low-level_peripherals|GPIO Connector (P1)]] are in '''bold''', with their default function (according to the [http://www.raspberrypi.org/wp-content/uploads/2012/04/Raspberry-Pi-Schematics-R1.0.pdf schematics]) in '''''bold italics'''''.
+Any GPIOs that aren't [[RPi_BCM2835_Pinout|connected]] on the RaspberryPi Model B revision 1.0 circuit board are <del>crossed out</del>, and the GPIOs available on the [[Rpi_Low-level_peripherals|GPIO Connector (P1)]] are in '''bold''', with their default function (according to the [http://www.raspberrypi.org/wp-content/uploads/2012/04/Raspberry-Pi-Schematics-R1.0.pdf schematics]) in '''''bold italics'''''.<br>
 GPIO Pins Alternative Function Assignment

@@ Line 3: / Line 3: @@
 Back to [[RPi_Low-level_peripherals]]
 = BCM2835 GPIO functions =
@@ Line 12: / Line 11: @@
 GPIO Pins Alternative Function Assignment
 {| border="1"
-! style="background-color:yellow;" | !! style="background-color:yellow;" | Pull !! style="background-color:yellow;" | ALT0 !! style="background-color:yellow;" | ALT1 !! style="background-color:yellow;" | ALT2 !! style="background-color:yellow;" | ALT3 !! style="background-color:yellow;" | ALT4 !! style="background-color:yellow;" | ALT5 !! style="background-color:yellow;" | RPi [[RPi_BCM2835_Signals|signal name]] !! style="background-color:yellow;" | RPi [[Rpi_Low-level_peripherals|connection]]
+! style="background-color:yellow;" | !! style="background-color:yellow;" | Pull !! style="background-color:yellow;" | ALT0 !! style="background-color:yellow;" | ALT1 !! style="background-color:yellow;" | ALT2 !! style="background-color:yellow;" | ALT3 !! style="background-color:yellow;" | ALT4 !! style="background-color:yellow;" | ALT5 !! style="background-color:yellow;" | RPi [[RPi_BCM2835_Signals_Rev1.0|Rev1.0 signal name]] !! style="background-color:yellow;" | RPi Rev1.0 [[Rpi_Low-level_peripherals|connection]]
 |-
 | <div id="GPIO0">'''GPIO0'''</div> || High || style="background-color:orange;" | '''''[[#SDA0|SDA0]]''''' || style="background-color:royalblue;" | [[#SAx|SA5]] || style="background-color:darkolivegreen" | <reserved> || || || || SDA0 || style="background-color:cyan;" | P1-03
@@ Line 122: / Line 121: @@
 | <div id="GPIO53">GPIO53</div> || High || || || || style="background-color:darkolivegreen;" | <internal> || || || SD_DATA3_R || R46
 |-
-! style="background-color:yellow;" | !! style="background-color:yellow;" | Pull !! style="background-color:yellow;" | ALT0 !! style="background-color:yellow;" | ALT1 !! style="background-color:yellow;" | ALT2 !! style="background-color:yellow;" | ALT3 !! style="background-color:yellow;" | ALT4 !! style="background-color:yellow;" | ALT5 !! style="background-color:yellow;" | RPi [[RPi_BCM2835_Signals|signal name]] !! style="background-color:yellow;" | RPi [[Rpi_Low-level_peripherals|connection]]
+! style="background-color:yellow;" | !! style="background-color:yellow;" | Pull !! style="background-color:yellow;" | ALT0 !! style="background-color:yellow;" | ALT1 !! style="background-color:yellow;" | ALT2 !! style="background-color:yellow;" | ALT3 !! style="background-color:yellow;" | ALT4 !! style="background-color:yellow;" | ALT5 !! style="background-color:yellow;" | RPi [[RPi_BCM2835_Signals_Rev1.0|Rev1.0 signal name]] !! style="background-color:yellow;" | RPi Rev1.0 [[Rpi_Low-level_peripherals|connection]]
 |}

@@ Line 105: / Line 105: @@
 | <div id="GPIO45">GPIO45</div> || - || style="background-color:lightblue;" | [[#PWMx|PWM1]] || style="background-color:orange;" | [[#SCL0|SCL0]] || style="background-color:magenta;" | [[#SCL1|SCL1]] || style="background-color:darkolivegreen;" | <reserved> || style="background-color:plum;" | [[#SPI2_CEx_N|SPI2_CE2_N]] || || PWM1_OUT || R27
 |-
-| <div id="GPIO46">GPIO46</div> || High || style="background-color:darkolivegreen;" | <Internal> || || || || || || HDMI_HPD_P || IC1-6
+| <div id="GPIO46">GPIO46</div> || High || || || || style="background-color:darkolivegreen;" | <internal> || || || HDMI_HPD_P || IC1-6
 |-
-| <div id="GPIO47">GPIO47</div> || High || style="background-color:darkolivegreen;" | <Internal> || || || || || || SD_CARD_DET || S8-10
+| <div id="GPIO47">GPIO47</div> || High || || || || style="background-color:darkolivegreen;" | <internal> || || || SD_CARD_DET || S8-10
 |-
-| <div id="GPIO48">GPIO48</div> || High || style="background-color:darkolivegreen;" | <Internal> || || || || || || SD_CLK_R || R48
+| <div id="GPIO48">GPIO48</div> || High || || || || style="background-color:darkolivegreen;" | <internal> || || || SD_CLK_R || R48
 |-
-| <div id="GPIO49">GPIO49</div> || High || style="background-color:darkolivegreen;" | <Internal> || || || || || || SD_CMD_R || R47
+| <div id="GPIO49">GPIO49</div> || High || || || || style="background-color:darkolivegreen;" | <internal> || || || SD_CMD_R || R47
 |-
-| <div id="GPIO50">GPIO50</div> || High || style="background-color:darkolivegreen;" | <Internal> || || || || || || SD_DATA0_R || R49
+| <div id="GPIO50">GPIO50</div> || High || || || || style="background-color:darkolivegreen;" | <internal> || || || SD_DATA0_R || R49
 |-
-| <div id="GPIO51">GPIO51</div> || High || style="background-color:darkolivegreen;" | <Internal> || || || || || || SD_DATA1_R || R50
+| <div id="GPIO51">GPIO51</div> || High || || || || style="background-color:darkolivegreen;" | <internal> || || || SD_DATA1_R || R50
 |-
-| <div id="GPIO52">GPIO52</div> || High || style="background-color:darkolivegreen;" | <Internal> || || || || || || SD_DATA2_R || R45
+| <div id="GPIO52">GPIO52</div> || High || || || || style="background-color:darkolivegreen;" | <internal> || || || SD_DATA2_R || R45
 |-
-| <div id="GPIO53">GPIO53</div> || High || style="background-color:darkolivegreen;" | <Internal> || || || || || || SD_DATA3_R || R46
+| <div id="GPIO53">GPIO53</div> || High || || || || style="background-color:darkolivegreen;" | <internal> || || || SD_DATA3_R || R46
 |-
 ! style="background-color:yellow;" | !! style="background-color:yellow;" | Pull !! style="background-color:yellow;" | ALT0 !! style="background-color:yellow;" | ALT1 !! style="background-color:yellow;" | ALT2 !! style="background-color:yellow;" | ALT3 !! style="background-color:yellow;" | ALT4 !! style="background-color:yellow;" | ALT5 !! style="background-color:yellow;" | RPi [[RPi_BCM2835_Signals|signal name]] !! style="background-color:yellow;" | RPi [[Rpi_Low-level_peripherals|connection]]