RPi BCM2835 GPIOs

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Revision as of 15:56, 25 February 2018 by AndrewS (talk | contribs) (Add the AVEOUT and AVEIN names from https://github.com/RPi-Distro/raspi-gpio/blob/master/raspi-gpio.c)
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Back to RPi_Low-level_peripherals

BCM2835 GPIO functions

This is a wiki-fied copy of Table 6-31 from the BCM2835 datasheet including any relevant errata, and additional info from the Compute Module datasheet, with a few 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 connected on the RaspberryPi Model B revision 2.0 circuit board are crossed out, and the GPIOs available on the GPIO Connector (P1) or P5 are in bold, with their default function (according to the schematics) in bold italics.
(If you want to see how GPIO-pins map back to actual pins, see this page). A selection of common circuits for interfacing with the GPIOs is given at RPi_GPIO_Interface_Circuits.

GPIO Pins Alternative Function Assignment

Bank Pull ALT0 ALT1 ALT2 ALT3 ALT4 ALT5 RPi Rev2.0 signal name / Rev1.0 if different RPi Rev2.0 connection / Rev1.0 if different RPi B+ connection Compute Module connection CM IO Board connection
GPIO0
 0 High SDA0 SA5 PCLK AVEOUT_VCLK AVEIN_VCLK SDA0 S5-14 / P1-03 J8-27 (ID_SD) J1-03 J5-01
GPIO1
 0 High SCL0 SA4 DE AVEOUT_DSYNC AVEIN_DSYNC SCL0 S5-13 / P1-05 J8-28 (ID_SC) J1-05 J5-03
GPIO2
 0 High SDA1 SA3 LCD_VSYNC AVEOUT_VSYNC AVEIN_VSYNC SDA1 P1-03 / S5-14 J8-03 J1-09 J5-05
GPIO3
 0 High SCL1 SA2 LCD_HSYNC AVEOUT_HSYNC AVEIN_HSYNC SCL1 P1-05 / S5-13 J8-05 J1-11 J5-07
GPIO4
 0 High GPCLK0 SA1 DPI_D0 AVEOUT_VID0 AVEIN_VID0 ARM_TDI GPIO_GCLK P1-07 J8-07 J1-15 J5-09
GPIO5
 0 High GPCLK1 SA0 DPI_D1 AVEOUT_VID1 AVEIN_VID1 ARM_TDO CAM_CLK S5-12 J8-29 J1-17 J5-11
GPIO6
 0 High GPCLK2 SOE_N / SE DPI_D2 AVEOUT_VID2 AVEIN_VID2 ARM_RTCK LAN_RUN IC3-12 J8-31 J1-21 J5-13
GPIO7
 0 High SPI0_CE1_N SWE_N / SRW_N DPI_D3 AVEOUT_VID3 AVEIN_VID3 SPI_CE1_N P1-26 J8-26 J1-23 J5-15
GPIO8
 0 High SPI0_CE0_N SD0 DPI_D4 AVEOUT_VID4 AVEIN_VID4 SPI_CE0_N P1-24 J8-24 J1-27 J5-17
GPIO9
 0 Low SPI0_MISO SD1 DPI_D5 AVEOUT_VID5 AVEIN_VID5 SPI_MISO P1-21 J8-21 J1-29 J5-19
GPIO10
 0 Low SPI0_MOSI SD2 DPI_D6 AVEOUT_VID6 AVEIN_VID6 SPI_MOSI P1-19 J8-19 J1-33 J5-21
GPIO11
 0 Low SPI0_SCLK SD3 DPI_D7 AVEOUT_VID7 AVEIN_VID7 SPI_SCLK P1-23 J8-23 J1-35 J5-23
GPIO12
 0 Low PWM0 SD4 DPI_D8 AVEOUT_VID8 AVEIN_VID8 ARM_TMS nc J8-32 J1-45 J5-25
GPIO13
 0 Low PWM1 SD5 DPI_D9 AVEOUT_VID9 AVEIN_VID9 ARM_TCK nc J8-33 J1-47 J5-27
GPIO14
 0 Low TXD0 SD6 DPI_D10 AVEOUT_VID10 AVEIN_VID10 TXD1 TXD0 P1-08 J8-08 J1-51 J5-29
GPIO15
 0 Low RXD0 SD7 DPI_D11 AVEOUT_VID11 AVEIN_VID11 RXD1 RXD0 P1-10 J8-10 J1-53 J5-31
GPIO16
 0 Low FL0 SD8 DPI_D12 CTS0 SPI1_CE2_N CTS1 STATUS_LED_N D5 (ACT LED) / D5 (OK LED) J8-36 J1-57 J5-33
GPIO17
 0 Low FL1 SD9 DPI_D13 RTS0 SPI1_CE1_N RTS1 GPIO_GEN0 P1-11 J8-11 J1-59 J5-35
GPIO18
 0 Low PCM_CLK SD10 DPI_D14 BSCSL SDA / MOSI SPI1_CE0_N PWM0 GPIO_GEN1 P1-12 J8-12 J1-63 J5-37
GPIO19
 0 Low PCM_FS SD11 DPI_D15 BSCSL SCL / SCLK SPI1_MISO PWM1 nc J8-35 J1-65 J5-39
GPIO20
 0 Low PCM_DIN SD12 DPI_D16 BSCSL / MISO SPI1_MOSI GPCLK0 nc J8-38 J1-69 J5-41
GPIO21
 0 Low PCM_DOUT SD13 DPI_D17 BSCSL / CE_N SPI1_SCLK GPCLK1 CAM_GPIO / GPIO_GEN2 S5-11 / P1-13 J8-40 J1-71 J5-43
GPIO22
 0 Low SD0_CLK SD14 DPI_D18 SD1_CLK ARM_TRST GPIO_GEN3 P1-15 J8-15 J1-75 J5-45
GPIO23
 0 Low SD0_CMD SD15 DPI_D19 SD1_CMD ARM_RTCK GPIO_GEN4 P1-16 J8-16 J1-77 J5-47
GPIO24
 0 Low SD0_DAT0 SD16 DPI_D20 SD1_DAT0 ARM_TDO GPIO_GEN5 P1-18 J8-18 J1-81 J5-49
GPIO25
 0 Low SD0_DAT1 SD17 DPI_D21 SD1_DAT1 ARM_TCK GPIO_GEN6 P1-22 J8-22 J1-83 J5-51
GPIO26
 0 Low SD0_DAT2 TE0 DPI_D22 SD1_DAT2 ARM_TDI nc J8-37 J1-87 J5-53
GPIO27
 0 Low SD0_DAT3 TE1 DPI_D23 SD1_DAT3 ARM_TMS GPIO_GEN2 / CAM_GPIO P1-13 / S5-11 J8-13 J1-89 J5-55
GPIO28
 1 - SDA0 SA5 PCM_CLK FL0 GPIO_GEN7 / CONFIG0 P5-03 / R10 or R8 J1-28 J6-01
GPIO29
 1 - SCL0 SA4 PCM_FS FL1 GPIO_GEN8 / CONFIG1 P5-04 / R9 or R7 J1-30 J6-03
GPIO30
 1 Low TE0 SA3 PCM_DIN CTS0 CTS1 GPIO_GEN9 / CONFIG2 P5-05 / R6 or R4 J1-34 J6-05
GPIO31
 1 Low FL0 SA2 PCM_DOUT RTS0 RTS1 GPIO_GEN10 / CONFIG3 P5-06 / R5 or R3 J1-36 J6-07
GPIO32
 1 Low GPCLK0 SA1 RING_OCLK TXD0 TXD1 nc J1-46 J6-09
GPIO33
 1 Low FL1 SA0 TE1 RXD0 RXD1 nc J1-48 J6-11
GPIO34
 1 High GPCLK0 SOE_N / SE TE2 SD1_CLK nc J1-52 J6-13
GPIO35
 1 High SPI0_CE1_N SWE_N / SRW_N SD1_CMD nc J1-54 J6-15
GPIO36
 1 High SPI0_CE0_N SD0 TXD0 SD1_DAT0 nc J1-58 J6-17
GPIO37
 1 Low SPI0_MISO SD1 RXD0 SD1_DAT1 nc J1-60 J6-19
GPIO38
 1 Low SPI0_MOSI SD2 RTS0 SD1_DAT2 nc J1-64 J6-21
GPIO39
 1 Low SPI0_SCLK SD3 CTS0 SD1_DAT3 nc J1-66 J6-23
GPIO40
 1 Low PWM0 SD4 SD1_DAT4 SPI2_MISO TXD1 PWM0_OUT R21 J1-70 J6-25
GPIO41
 1 Low PWM1 SD5 TE0 SD1_DAT5 SPI2_MOSI RXD1 nc J1-72 J6-27
GPIO42
 1 Low GPCLK1 SD6 TE1 SD1_DAT6 SPI2_SCLK RTS1 nc J1-76 J6-29
GPIO43
 1 Low GPCLK2 SD7 TE2 SD1_DAT7 SPI2_CE0_N CTS1 nc J1-78 J6-31
GPIO44
 1 - GPCLK1 SDA0 SDA1 TE0 SPI2_CE1_N nc J1-82 J6-33
GPIO45
 1 - PWM1 SCL0 SCL1 TE1 SPI2_CE2_N PWM1_OUT R27 J1-84 J6-35
GPIO46
 2 High <internal> HDMI_HPD_P IC1-6 J1-88 Q4
GPIO47
 2 High <internal> SD_CARD_DET S8-10 J1-90 Q2
GPIO48
 2 High <internal> SD_CLK_R R48 R8 / J1-10 n/a / J16-5
GPIO49
 2 High <internal> SD_CMD_R R47 U3-1 / J1-12 n/a / J16-3
GPIO50
 2 High <internal> SD_DATA0_R R49 U2-A3 / J1-16 n/a / J16-7
GPIO51
 2 High <internal> SD_DATA1_R R50 U2-A4 / J1-18 n/a / J16-8
GPIO52
 2 High <internal> SD_DATA2_R R45 U2-A5 / J1-22 n/a / J16-1
GPIO53
 2 High <internal> SD_DATA3_R R46 U2-B2 / J1-24 n/a / J16-2
Bank Pull ALT0 ALT1 ALT2 ALT3 ALT4 ALT5 RPi Rev2.0 signal name / Rev1.0 if different RPi Rev2.0 connection / Rev1.0 if different RPi B+ connection Compute Module connection CM IO Board connection


As in the table above, the GPIOs available on the GPIO Connector (P1) or P5 are in bold, with their default function (according to the schematics) in bold italics.

Special function legend:

Name Function Datasheet section GPIOs DeviceTree 'function'
SDA0
 BSC master 0 data line BSC GPIO0 GPIO28 GPIO44 i2c0
SCL0
 BSC master 0 clock line BSC GPIO1 GPIO29 GPIO45 i2c0
SDA1
 BSC master 1 data line BSC GPIO2 GPIO44 i2c1
SCL1
 BSC master 1 clock line BSC GPIO3 GPIO45 i2c1
GPCLK0
 General purpose Clock 0 <TBD> GPIO4 GPIO20 GPIO32 GPIO34 gp_clk
GPCLK1
 General purpose Clock 1 <TBD> GPIO5 GPIO21 GPIO42 GPIO44 gp_clk
GPCLK2
 General purpose Clock 2 <TBD> GPIO6 GPIO43 gp_clk
SPI0_CE1_N
 SPI0 Chip select 1 SPI GPIO7 GPIO35 spi
SPI0_CE0_N
 SPI0 Chip select 0 SPI GPIO8 GPIO36 spi
SPI0_MISO
 SPI0 MISO SPI GPIO9 GPIO37 spi
SPI0_MOSI
 SPI0 MOSI SPI GPIO10 GPIO38 spi
SPI0_SCLK
 SPI0 Serial clock SPI GPIO11 GPIO39 spi
PWMx
 Pulse Width Modulator 0..1 Pulse Width Modulator PWM0: GPIO12 GPIO18 GPIO40
PWM1: GPIO13 GPIO19 GPIO41 GPIO45		 pwm
TXD0
 UART 0 Transmit Data UART GPIO14 GPIO32 GPIO36 uart0
RXD0
 UART 0 Receive Data UART GPIO15 GPIO33 GPIO37 uart0
CTS0
 UART 0 Clear To Send UART GPIO16 GPIO30 GPIO39 uart0
RTS0
 UART 0 Request To Send UART GPIO17 GPIO31 GPIO38 uart0
PCM_CLK
 PCM clock PCM Audio GPIO18 GPIO28 pcm
PCM_FS
 PCM Frame Sync PCM Audio GPIO19 GPIO29 pcm
PCM_DIN
 PCM Data in PCM Audio GPIO20 GPIO30 pcm
PCM_DOUT
 PCM data out PCM Audio GPIO21 GPIO31 pcm
SAx
 Secondary mem Address bus Secondary Memory Interface many smi
SOE_N / SE
 Secondary mem. Controls Secondary Memory Interface GPIO6 GPIO34 smi
SWE_N / SRW_N
 Secondary mem. Controls Secondary Memory Interface GPIO7 GPIO35 smi
SDx
 Secondary mem. data bus Secondary Memory Interface many smi
BSCSL SDA / MOSI
 BSC slave Data, SPI slave MOSI BSC/SPI slave GPIO18 spi_slave
BSCSL SCL / SCLK
 BSC slave Clock, SPI slave clock BSC/SPI slave GPIO19 spi_slave
BSCSL - / MISO
 BSC <not used>, SPI MISO BSC/SPI slave GPIO20 spi_slave
BSCSL - / CE_N
 BSC <not used>, SPI CSn BSC/SPI slave GPIO21 spi_slave
SPI1_CEx_N
 SPI1 Chip select 0-2 Auxiliary I/O SPI1_CE0_N: GPIO18
SPI1_CE1_N: GPIO17
SPI1_CE2_N: GPIO16		 spi1
SPI1_MISO
 SPI1 MISO Auxiliary I/O GPIO19 spi1
SPI1_MOSI
 SPI1 MOSI Auxiliary I/O GPIO20 spi1
SPI1_SCLK
 SPI1 Serial clock Auxiliary I/O GPIO21 spi1
TXD1
 UART 1 Transmit Data Auxiliary I/O GPIO14 GPIO32 GPIO40 uart1
RXD1
 UART 1 Receive Data Auxiliary I/O GPIO15 GPIO33 GPIO41 uart1
CTS1
 UART 1 Clear To Send Auxiliary I/O GPIO16 GPIO30 GPIO43 uart1
RTS1
 UART 1 Request To Send Auxiliary I/O GPIO17 GPIO31 GPIO42 uart1
SPI2_CEx_N
 SPI2 Chip select 0-2 Auxiliary I/O SPI2_CE0_N: GPIO43
SPI2_CE1_N: GPIO44
SPI2_CE2_N: GPIO45		 spi2
SPI2_MISO
 SPI2 MISO Auxiliary I/O GPIO40 spi2
SPI2_MOSI
 SPI2 MOSI Auxiliary I/O GPIO41 spi2
SPI2_SCLK
 SPI2 Serial clock Auxiliary I/O GPIO42 spi2
ARM_TRST
 ARM JTAG reset <TBD> GPIO22 arm_jtag
ARM_RTCK
 ARM JTAG return clock <TBD> GPIO6 GPIO23 arm_jtag
ARM_TDO
 ARM JTAG Data out <TBD> GPIO4 GPIO24 arm_jtag
ARM_TCK
 ARM JTAG Clock <TBD> GPIO13 GPIO25 arm_jtag
ARM_TDI
 ARM JTAG Data in <TBD> GPIO4 GPIO26 arm_jtag
ARM_TMS
 ARM JTAG Mode select <TBD> GPIO12 GPIO27 arm_jtag
PCLK
 DPI Pixel Clock Parallel Display Interface GPIO0 dpi
DE
 DPI Data Enable Parallel Display Interface GPIO1 dpi
LCD_VSYNC
 DPI Vertical Sync Parallel Display Interface GPIO2 dpi
LCD_HSYNC
 DPI Horizontal Sync Parallel Display Interface GPIO3 dpi
DPI_Dx
 DPI Parallel Data Parallel Display Interface many dpi
Name Function Datasheet section GPIOs DeviceTree 'function'
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