Access Pins on P8/P9

The P8 and P9 plugs enable access to many GPIOs and the analog inputs. However, not all of them are freely usable by default. The HDMI and Linux device tree standard “slots” use some pins for HDMI, eMMC, and MCASP0. The following list shows which pins can be used as GPIOs or analog inputs and which pins are already in use by the system.

Important

Pay attention to the different permitted voltages and currents for the inputs and outputs.

Table 1. Plug P9

Header Pin	Pin Name	CODESYS Support	Used by System
P9_01	GND	NO	NO
P9_02	GND	NO	NO
P9_03	DC_3.3V	NO	NO
P9_04	DC_3.3V	NO	NO
P9_05	VDD_5V	NO	NO
P9_06	VDD_5V	NO	NO
P9_07	SYS_5V	NO	NO
P9_08	SYS_5V	NO	NO
P9_09	PWR_BUT	NO	NO
P9_10	SYS_RESETn	NO	NO
P9_11	UART4_RXD	YES	NO
P9_12	GPIO1_28	YES	NO
P9_13	UART4_TXD	YES	NO
P9_14	EHRPWM1A	YES	NO
P9_15	GPIO1_16	YES	NO
P9_16	EHRPWM1B	YES	NO
P9_17	I2C1_SCL	NO	PINMUX I²C
P9_18	I2C1_SDA	NO	PINMUX I²C
P9_19	I2C2_SCL	NO	PINMUX I²C
P9_20	I2C2_SDA	NO	PINMUX I²C
P9_21	UART2_TXD	YES	NO
P9_22	UART2_RXD	YES	NO
P9_23	GPIO1_17	YES	NO
P9_24	UART1_TXD	YES	NO
P9_25	GPIO3_21	NO	MCASPO
P9_26	UART1_RXD	YES	NO
P9_27	GPIO3_19	YES	NO
P9_28	SPI1_CS0	NO	MCASP0
P9_29	SPI1_D0	NO	MCASP0
P9_30	SPI1_D1	NO	MCASP0
P9_31	SPI1_SCLK	NO	MCASP0
P9_32	VADC	NO	NO
P9_33	AIN4	YES	NO
P9_34	AGND	NO	NO
P9_35	AIN6	YES	NO
P9_36	AIN5	YES	NO
P9_37	AIN2	YES	NO
P9_38	AIN3	YES	NO
P9_39	AIN0	YES	NO
P9_40	AIN1	YES	NO
P9_41	GPIO0_20	YES	NO
P9_42	GPIO0_7	YES	NO
P9_43	GND	NO	NO
P9_44	GND	NO	NO
P9_45	GND	NO	NO
P9_46	GND	NO	NO

Table 2. Plug P8

Header Pin	Pin Name	CODESYS Support	Used by System
P8_01	DGND	NO	NO
P8_02	DGND	NO	NO
P8_03	GPIO1_6	NO	eMMC
P8_04	GPIO1_7	NO	eMMC
P8_05	GPIO1_2	NO	eMMC
P8_06	GPIO1_3	NO	eMMC
P8_07	TIMER4	YES	NO
P8_08	TIMER7	YES	NO
P8_09	TIMER5	YES	NO
P8_10	TIMER6	YES	NO
P8_11	GPIO1_13	YES	NO
P8_12	GPIO1_12	YES	NO
P8_13	EHRPWM2B	YES	NO
P8_14	GPIO0_26	YES	NO
P8_15	GPIO1_15	YES	NO
P8_16	GPIO1_14	YES	NO
P8_17	GPIO0_27	YES	NO
P8_18	GPIO2_1	YES	NO
P8_19	EHRPWM2A	YES	NO
P8_20	GPIO1_31	NO	eMMC
P8_21	GPIO1_30	NO	eMMC
P8_22	GPIO1_5	NO	eMMC
P8_23	GPIO1_4	NO	eMMC
P8_24	GPIO1_1	NO	eMMC
P8_25	GPIO1_0	NO	eMMC
P8_26	GPIO1_29	YES	NO
P8_27	GPIO2_22	NO	HDMI
P8_28	GPIO2_24	NO	HDMI
P8_29	GPIO2_23	NO	HDMI
P8_30	GPIO2_25	NO	HDMI
P8_31	UART5_CTSN	NO	HDMI
P8_32	UART5_RTSN	NO	HDMI
P8_33	UART4_RTSN	NO	HDMI
P8_34	UART3_RTSN	NO	HDMI
P8_35	UART4_CTSN	NO	HDMI
P8_36	UART3_CTSN	NO	HDMI
P8_37	UART5_TXD	NO	HDMI
P8_38	UART5_TXD	NO	HDMI
P8_39	GPIO2_12	NO	HDMI
P8_40	GPIO2_13	NO	HDMI
P8_41	GPIO2_10	NO	HDMI
P8_42	GPIO2_11	NO	HDMI
P8_43	GPIO2_8	NO	HDMI
P8_44	GPIO2_9	NO	HDMI
P8_45	GPIO2_6	NO	HDMI
P8_46	GPIO2_7	NO	HDMI