BeagleBone Black Pins

Pinout Tables

These tables are based on the BeagleBone Black System Reference Manual (Creative Commons) by Gerald Coley of BeagleBoard.org. They aren't really available anywhere else on the internet, so I thought I'd transcribe them into a more available format.

The PROC column is the pin number on the processor.

The PIN column is the pin number on the expansion header.

The MODE columns are the mode setting for each pin. Setting each mode to align with the mode column will give that function on that pin. Each pin's mode can be set individually.

Note that the MODE5 column is absent. That is not a typo. It just doesn't do anything. The only exception is GPIO0_7 in expansion header P9 has a mmc0_sdwp

Expansion Header P8 Pinout
PIN	PROC	NAME	MODE0	MODE1	MODE2	MODE3	MODE4	MODE6	MODE7
1,2	GND
3	R9	GPIO1_6	gpmc_ad6	mmc1_dat6					gpio1[6]
4	T9	GPIO1_7	gpmc_ad7	mmc1_dat7					gpio1[7]
5	R8	GPIO1_2	gpmc_ad2	mmc1_dat2					gpio1[2]
6	T8	GPIO1_3	gpmc_ad3	mmc1_dat3					gpio1[3]
7	R7	TIMER4	gpmc_advn_ale		timer4				gpio2[2]
8	T7	TIMER7	gpmc_oen_ren		timer7				gpio2[3]
9	T6	TIMER5	gpmc_be0n_cle		timer5				gpio2[5]
10	U6	TIMER6	gpmc_wen		timer6				gpio2[4]
11*	R12	GPIO1_13	gpmc_ad13	lcd_data18	mmc1_dat5*	mmc2_dat1	eQEP2B_in		gpio1[13]
12*	T12	GPIO1_12	gpmc_ad12	lcd_data19	mmc1_dat4*	mmc2_dat0	EQEP2A_IN		gpio1[12]
13*	T10	EHRPWM2B	gpmc_ad9	lcd_data22	mmc1_dat1*	mmc2_dat5	ehrpwm2B		gpio0[23]
14*	T11	GPIO0_26	gpmc_ad10	lcd_data21	mmc1_dat2*	mmc2_dat6	ehrpwm2_tripzone		gpio0[26]
15*	U13	GPIO1_15	gpmc_ad15	lcd_data16	mmc1_dat7*	mmc2_dat3	eQEP2_strobe		gpio1[15]
16*	V13	GPIO1_14	gpmc_ad14	lcd_data17	mmc1_dat6*	mmc2_dat2	eQEP2_index		gpio1[14]
17*	U12	GPIO0_27	gpmc_ad11	lcd_data20	mmc1_dat3*	mmc2_dat7	ehrpwm0_synco		gpio0[27]
18	V12	GPIO2_1	gpmc_clk_mux0	lcd_memory_clk	gpmc_wait1	mmc2_clk		mcasp0_fsr	gpio2[1]
19*	U10	EHRPWM2A	gpmc_ad8	lcd_data23	mmc1_dat0*	mmc2_dat4	ehrpwm2A		gpio0[22]
20*	V9	GPIO1_31	gpmc_csn2	gpmc_be1n	mmc1_cmd*				gpio1[31]
21*	U9	GPIO1_30	gpmc_csn1	gpmc_clk	mmc1_clk*				gpio1[30]
22	V8	GPIO1_5	gpmc_ad5	mmc1_dat5					gpio1[5]
23	U8	GPIO1_4	gpmc_ad4	mmc1_dat4					gpio1[4]
24	V7	GPIO1_1	gpmc_ad1	mmc1_dat1					gpio1[1]
25	U7	GPIO1_0	gpmc_ad0	mmc1_dat0					gpio1[0]
26	V6	GPIO1_29	gpmc_csn0						gpio1[29]
27*	U5	GPIO2_22	lcd_vsync*	gpmc_a8					gpio2[22]
28*	V5	GPIO2_24	lcd_pclk*	gpmc_a10					gpio2[24]
29*	R5	GPIO2_23	lcd_hsync*	gpmc_a9					gpio2[23]
30*	R6	GPIO2_25	lcd_ac_bias_en*	gpmc_a11					gpio2[25]
31*	V4	UART5_CTSN	lcd_data14*	gpmc_a18	eQEP1_index	mcasp0_axr1	uart5_rxd	uart5_ctsn	gpio0[10]
32*	T5	UART5_RTSN	lcd_data15*	gpmc_a19	eQEP1_strobe	mcasp0_ahclkx	mcasp0_axr3	uart5_rtsn	gpio0[11]
33*	V3	UART4_RTSN	lcd_data13*	gpmc_a17	eQEP1B_in	mcasp0_fsr	mcasp0_axr3	uart4_rtsn	gpio0[9]
34*	U4	UART3_RTSN	lcd_data11*	gpmc_a15	ehrpwm1B	mcasp0_ahclkr	mcasp0_axr2	uart3_rtsn	gpio2[17]
35*	V2	UART4_CTSN	lcd_data12*	gpmc_a16	eQEP1A_in	mcasp0_aclkr	mcasp0_axr2	uart4_ctsn	gpio0[8]
36*	U3	UART3_CTSN	lcd_data10*	gpmc_a14	ehrpwm1A	mcasp0_axr0		uart3_ctsn	gpio2[16]
37*	U1	UART5_TXD	lcd_data8*	gpmc_a12	ehrpwm1_tripzone	mcasp0_aclkx	uart5_txd	uart2_ctsn	gpio2[14]
38*	U2	UART5_RXD	lcd_data9*	gpmc_a13	ehrpwm0_synco	mcasp0_fsx	uart5_rxd	uart2_rtsn	gpio2[15]
39*	T3	GPIO2_12	lcd_data6*	gpmc_a6		eQEP2_index			gpio2[12]
40*	T4	GPIO2_13	lcd_data7*	gpmc_a7		eQEP2_strobe	pr1_edio_data_out7		gpio2[13]
41*	T1	GPIO2_10	lcd_data4*	gpmc_a4		eQEP2A_in			gpio2[10]
42*	T2	GPIO2_11	lcd_data5*	gpmc_a5		eQEP2B_in			gpio2[11]
43*	R3	GPIO2_8	lcd_data2*	gpmc_a2		ehrpwm2_tripzone			gpio2[8]
44*	R4	GPIO2_9	lcd_data3*	gpmc_a3		ehrpwm0_synco			gpio2[9]
45*	R1	GPIO2_6	lcd_data0*	gpmc_a0		ehrpwm2A			gpio2[6]
46*	R2	GPIO2_7	lcd_data1*	gpmc_a1		ehrpwm2B			gpio2[7]

* some pins are used by the internal storage (eMMC), and HDMI. 11-21 are used by eMMC. 27-46 are used by HDMI.

Expansion Header P9 Pinout
PIN	PROC	NAME	MODE0	MODE2	MODE3	MODE4	MODE6	MODE7
1,2	GND
3,4	DC_3.3V
5,6	VDD_5V
7,8	SYS_5V
9	PWR_BUT
10	A10	RESET_OUT
11	T17	gpmc_wait0	mii2_crs	gpmc_csn4	rmii2_crs_dv	mmc1_sdcd	uart4_rxd_mux2	gpio0[30]
12	U18	gpmc_be1n	mii2_col	gpmc_csn6	mmc2_dat3	gpmc_dir	mcasp0_aclkr_mux3	gpio1[28]
13	U17	gpmc_wpn	mii2_rxerr	gpmc_csn5	rmii2_rxerr	mmc2_sdcd	uart4_txd_mux2	gpio0[31]
14	U14	gpmc_a2	mii2_txd3	rgmii2_td3	mmc2_dat1	gpmc_a18	ehrpwm1A_mux1	gpio1[18]
15	R13	gpmc_a0	gmii2_txen	rmii2_tctl	mii2_txen	gpmc_a16	ehrpwm1_tripzone	gpio1[16]
16	T14	gpmc_a3	mii2_txd2	rgmii2_td2	mmc2_dat2	gpmc_a19	ehrpwm1B_mux1	gpio1[19]
17	A16	spi0_cs0	mmc2_sdwp	I2C1_SCL	ehrpwm0_synci			gpio0[5]
18	B16	spi0_d1	mmc1_sdwp	I2C1_SDA	ehrpwm0_tripzone			gpio0[4]
19	D17	uart1_rtsn	timer5	dcan0_rx	I2C2_SCL	spi1_cs1		gpio0[13]
20	D18	uart1_ctsn	timer6	dcan0_tx	I2C2_SDA	spi1_cs0		gpio0[12]
21	B17	spi0_d0	uart2_txd	I2C2_SCL	ehrpwm0B		EMU3_mux1	gpio0[3]
22	A17	spi0_sclk	uart2_rxd	I2C2_SDA	ehrpwm0A		EMU2_mux1	gpio0[2]
23	V14	gpmc_a1	gmii2_rxdv	rgmii2_rxdv	mmc2_dat0	gpmc_a17	ehrpwm0_synco	gpio1[17]
24	D15	uart1_txd	mmc2_sdwp	dcan1_rx	I2C1_SCL			gpio0[15]
25	A14	mcasp0_ahclkx	eQEP0_strobe	mcasp0_axr3	mcasp1_axr1	EMU4_mux2		gpio3[21]
26	D16	uart1_rxd	mmc1_sdwp	dcan1_tx	I2C1_SDA			gpio0[14]
27	C13	mcasp0_fsr	eQEP0B_in	mcasp0_axr3	mcasp1_fsx	EMU2_mux2		gpio3[19]
28	C12	mcasp0_ahclkr	ehrpwm0_synci	mcasp0_axr2	spi1_cs0	eCAP2_in_PWM2_out		gpio3[17]
29	B13	mcasp0_fsx	ehrpwm0B		spi1_d0	mmc1_sdcd_mux1		gpio3[15]
30	D12	mcasp0_axr0	ehrpwm0_tripzone		spi1_d1	mmc2_sdcd_mux1		gpio3[16]
31	A13	mcasp0_aclkx	ehrpwm0A		spi1_sclk	mmc0_sdcd_mux1		gpio3[14]
32		VADC
33	C8	AIN4
34		AGND
35	A8	AIN6
36	B8	AIN5
37	B7	AIN2
38	A7	AIN3
39	B6	AIN0
40	C7	AIN1
41#	D14	xdma_event_intr1		tclkin	clkout2	timer7_mux1	EMU3_mux0	gpio0[20]
41#	D13	mcasp0_axr1	eQEP0_index		Mcasp1_axr0	emu3		gpio3[20]
42@	C18	eCAP0_in_PWM0_out	uart3_txd	spi1_cs1	pr1_ecap0_ecap _capin_apwm_o	spi1_sclk	xdma_event_intr2	gpio0[7]
42@	B12	Mcasp0_aclkr	eQEP0A_in	Mcaspo_axr2	Mcasp1_aclkx			gpio3[18]

Selecting Modes

Using the "everything is a file" sys directory, you can use BASH or whatever to change the mode number for the pin in the NAME column.

echo 7 > /sys/kernel/debug/omap_mux/gpmc_ad4
echo 36 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio32/direction
echo 1 > /sys/class/gpio/gpio32/value

If you are using windows, TI has this GUI you can use called PinMuxTool / Pin Mux Utility. The BBB is AM335x r2 based.

The above only works if you're using the older kernel. The new 3.8 based kernel is missing this nifty pin mux feature. However, you can still check what they're muxed at even if you can't change them easily at runtime by looking at

/sys/kernel/debug/pinctrl/44e10800.pinmux/pingroups

root@arm:/sys/kernel/debug/pinctrl/44e10800.pinmux# cat pingroups 
registered pin groups:
group: pinmux_userled_pins
pin 21 (44e10854)
pin 22 (44e10858)
pin 23 (44e1085c)
pin 24 (44e10860)

group: pinmux_rstctl_pins
pin 20 (44e10850)

group: pinmux_i2c0_pins
pin 98 (44e10988)
pin 99 (44e1098c)

group: pinmux_i2c2_pins
pin 94 (44e10978)
pin 95 (44e1097c)

group: pinmux_emmc2_pins
pin 32 (44e10880)
pin 33 (44e10884)
pin 0 (44e10800)
pin 1 (44e10804)
pin 2 (44e10808)
pin 3 (44e1080c)
pin 4 (44e10810)
pin 5 (44e10814)
pin 6 (44e10818)
pin 7 (44e1081c)

group: pinmux_userled_pins
pin 21 (44e10854)
pin 22 (44e10858)
pin 23 (44e1085c)
pin 24 (44e10860)

group: mcasp0_pins
pin 107 (44e109ac)
pin 103 (44e1099c)
pin 101 (44e10994)
pin 100 (44e10990)
pin 106 (44e109a8)

group: nxp_hdmi_bonelt_pins
pin 108 (44e109b0)
pin 40 (44e108a0)
pin 41 (44e108a4)
pin 42 (44e108a8)
pin 43 (44e108ac)
pin 44 (44e108b0)
pin 45 (44e108b4)
pin 46 (44e108b8)
pin 47 (44e108bc)
pin 48 (44e108c0)
pin 49 (44e108c4)
pin 50 (44e108c8)
pin 51 (44e108cc)
pin 52 (44e108d0)
pin 53 (44e108d4)
pin 54 (44e108d8)
pin 55 (44e108dc)
pin 56 (44e108e0)
pin 57 (44e108e4)
pin 58 (44e108e8)
pin 59 (44e108ec)

group: nxp_hdmi_bonelt_off_pins
pin 108 (44e109b0)

Check Pin Statuses

root@beaglebone:~# cat /sys/kernel/debug/gpio
GPIOs 0-31, gpio:

GPIOs 32-63, gpio:
 gpio-52  (eMMC_RSTn           ) out lo
 gpio-53  (beaglebone:green:usr) out lo
 gpio-54  (beaglebone:green:usr) out lo
 gpio-55  (beaglebone:green:usr) out hi
 gpio-56  (beaglebone:green:usr) out lo
 gpio-59  (McASP Clock Enable P) out hi

GPIOs 64-95, gpio:

GPIOs 96-127, gpio:

Power Limitations

Be careful about this one, there are some much lower limits than you might be used to

Pin Type	Maximum Voltage	Maximum Current
AIN	1.8V
GPIO	3.3V	4mA - 6mA
VDD 3.3	3.3V	250mA
VDD 5V	5V*	1000mA *
SYS 5V	5V	250mA
VDD ADC	1.8V	0?
SYS 5V	5V	250mA

* VDD only works when the 5V barrel jack is used

i2c

It is recommended that you use I2C2 on pins 19 and 20 with the /dev/i2c-3 device.

Mode Name	Port	Physical Pin Number	Block Device
I2C1	P9	17 & 18 or 24 & 26	?
I2C2	P9	19 & 20 or 21 & 22	/dev/i2c-3

To check which i2c interfaces are avaible, check

root@arm:~# ls -l /dev/i2c*
crw-rw---- 1 root i2c 89, 0 Jun  5 04:34 /dev/i2c-0
crw-rw---- 1 root i2c 89, 1 Jun  5 04:34 /dev/i2c-1

To see what addresses are being used, try the i2cdetect command. In the below example, I have a temperature sensor hooked up to pins 19 and 20 that is using 48. Also note that the UU addresses are being used by the system and are unavailable.

root@beaglebone:~# i2cdetect -y -r 3
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- UU -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- 48 -- -- -- -- -- -- -- 
50: -- -- -- -- UU UU UU UU -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --

Evan Boldt Sat, 06/01/2013 - 13:44

Attachments

BBB_SRM.pdf2.88 MB