RockpiE/hardware/gpio

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    ROCK Pi E >  Hardware >  GPIO

General purpose input-output (GPIO) connector

ROCK Pi E has one 40-pin expansion header. Each pin is distinguished by color. Before using the 40-pin connector (I mean you may use serial console cable or any HAT.), find where the PIN#1(PCBA silkscreen 1) is on ROCK Pi E.

Hardware V1.0/V1.1

40-pin Header

GPIO number	Func4	Func3	Func2	Func1	Pin#	Pin#	Func1	Func2	Func3	Func4	GPIO number
				+3.3V	1	2	+5.0V
68			I2C1_SDA	GPIO2_A4	3	4	+5.0V
69			I2C1_SCL	GPIO2_A5	5	6	GND
100	UART1_TX	SDMMC0EXT_D0	TSP_D0	GPIO3_A4	7	8	GPIO2_A0	UART2_TX_M1			64
				GND	9	10	GPIO2_A1	UART2_RX_M1			65
96	SPI0_CLK	SDMMC0EXT_CMD	TSP_VALID	GPIO3_A0	11	12	GPIO2_D2				90
104	SPI0_CSN0		TSP_D4	GPIO3_B0	13	14	GND
98	SPI0_RXD	SDMMC0EXT_CLK	TSP_CLK	GPIO3_A2	15	16	USB20DM
				+3.3V	17	18	USB20DP
27			SPDIF_TX_M0	GPIO0_D3	19	20	GND
83	CARD_CLK_M1	PDM_SDI0_M0	I2S1_SDI	GPIO2_C3	21	22	GPIO2_B4				76
60			CLK32KOUT_M1	GPIO1_D4	23	24	GPIO2_A3	EFUSE_PWREN			67
				GND	25	26	GPIO2_C7	I2S1_SDO	PDM_FSYNC_M0		87
97	SPI0_TXD	SDMMC0EXT_DET	TSP_FAIL	GPIO3_A1	27	28	GPIO2_C1	I2S1_LRCK_TX	SPDIF_TX_M1	TSP_D6_M1	81
80		TSP_D5_M1	I2S1_LRCK_RX	GPIO2_C0	29	30	GND
79		TSP_SYNC_M1	I2S1_MCLK	GPIO2_B7	31	32	GPIO3_A6	TSP_D2	SDMMC0EXT_D2	UART1_RX	102
82	TSP_D7_M1	PDM_CLK_M0	I2S1_SCLK	GPIO2_C2	33	34	GND
				ADC_IN1	35	36	GPIO2_C5	I2S1_SDIO2	PDM_SDI2_M0	CARD_DET_M1	85
66			IR_RX	GPIO2_A2	37	38	GPIO2_C4	I2S1_SDIO1	PDM_SDI1_M0	CARD_RST_M1	84
				GND	39	40	GPIO2_C6	I2S1_SDIO3	PDM_SDI3_M0	CARD_IO_M1	86

More details about V1.0/V1.1 40-pin Header

Pin#12(GPIO2_D2) is also the sleep pin of PMIC RK805. Be careful when you try to control it.
Pin#3 and Pin#5 are only for I2C communication, not for GPIO operation and so forth.
Pins marked with color orange are designed for debug console.
SPI: x1, SPI0(Pin#11/13/15/27)
I2C: x1, I2C1
UART: x2, UART1 and UART2
USB: USB20DM(Pin#16) and USB20DP(Pin#18)
PDM: x1
I2S: x1, I2S1

Hardware V1.2

40-pin Header

GPIO number	Func3	Func2	Func1	Pin#	Pin#	Func1	Func2	Func3	GPIO number
			+3.3V	1	2	+5.0V
100		UART1_TX	GPIO3_A4	3	4	+5.0V
102		UART1_RX	GPIO3_A6	5	6	GND
60			GPIO1_D4	7	8	GPIO2_A0	UART2_TX		64
			GND	9	10	GPIO2_A1	UART2_RX		65
66		PWM_IR	GPIO2_A2	11	12	GPIO2_C2	PDM_CLK	I2S1_SCLK	82
67			GPIO2_A3	13	14	GND
27			GPIO0_D3	15	16	USB20DM
			+3.3V	17	18	USB20DP
97		SPI0_TXD	GPIO3_A1	19	20	GND
98		SPI0_RXD	GPIO3_A2	21	22	ADC_IN1
96		SPI0_CLK	GPIO3_A0	23	24	GPIO3_B0	SPI0_CSN0		104
			GND	25	26	GPIO2_B4			76
68		I2C1_SDA	GPIO2_A4	27	28	GPIO2_A5	I2C1_SCL		69
84	I2S1_SDIO1	PDM_SDI1	GPIO2_C4	29	30	GND
85	I2S1_SDIO2	PDM_SDI2	GPIO2_C5	31	32	GPIO2_C0	I2S1_LRCK_RX		80
70		PWM2	GPIO2_A6	33	34	GND
81		I2S1_LRCK_TX	GPIO2_C1	35	36	GPIO2_B7	I2S1_MCLK		79
86		PDM_SDI3	GPIO2_C6	37	38	GPIO2_C3	PDM_SDI0	I2S1_SDI	83
			GND	39	40	GPIO2_C7	PDM_FSYNC	I2S1_SDO	87

More details about V1.2 40-pin Header

Pin#27 and Pin#28 are only for I2C communication, not for GPIO operation and so forth.
Pins marked with color orange are designed for debug console.
SPI: x1, SPI0(Pin#19/21/23/24)
I2C: x1, I2C1
UART: x2, UART1 and UART2
PWM: x1, PWM2
USB: USB20DM(Pin#16) and USB20DP(Pin#18)
PDM: x1
I2S: x1, I2S1

IO Voltage

RK3328 have two IO voltages, 1.8V/3.3V. For ROCK Pi E, the voltage level of GPIOs showed in the tables above are 3.3V and tolerance of those are 3.6V.

GPIO number

Rockchip RK3328 GPIO has 4 banks, GPIO0 to GPIO3, each bank has 32pins, naming as below:

   GPIO0_A0 ~ A7 
   GPIO0_B0 ~ B7
   GPIO0_C0 ~ C7
   GPIO0_D0 ~ D7
   
   GPIO1_A0 ~ A7
   ....
   GPIO1_D0 ~ D7

For Rockchip 4.4 kernel, the GPIO number can be calculated as below, take GPIO2_A2(PIN39 on 40PIN GPIO) as an example:

   GPIO2_A2 = 32*2 + 8*0 + 2 = 66

To set GPIO2_A2 output

   cd /sys/class/gpio
   echo 66 > export
   cd gpio66
   echo out > direction
   echo 1 > value     # output high
   echo 0 > value     # output low