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.

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	POWERSTATE0		64
				GND	9	10	GPIO2_A1	UART2_RX_M1	POWERSTATE1		65
96	SPI_CLK_M2	SDMMC0EXT_CMD	TSP_VALID	GPIO3_A0	11	12	GPIO2_D2				90
104	SPI_CSN0_M2		TSP_D4	GPIO3_B0	13	14	GND
98	SPI_RXD_M2	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	SPI_CSN1_M0	FLASH_VOL_SEL		76
60			CLK32KOUT_M1	GPIO1_D4	23	24	GPIO2_A3	EFUSE_PWREN	POWERSTATE3		67
				GND	25	26	GPIO2_C7	I2S1_SDO	PDM_FSYNC_M0		87
97	SPI_TXD_M2	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		POWERSTATE2	IR_RX	GPIO2_A2	39	38	GPIO2_C4	2S1_SDIO1	PDM_SDI1_M0	CARD_RST_M1	84
				GND	39	40	GPIO2_C6	I2S1_SDIO3	PDM_SDI3_M0	CARD_IO_M1	86

RK3328 have two IO voltages, 1.8V/3.3V.

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