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Difference between revisions of "Rockpi4/hardware/gpio"

 
Line 91: Line 91:
 
     echo 1 > value    # output high
 
     echo 1 > value    # output high
 
     echo 0 > value    # output low
 
     echo 0 > value    # output low
 +
=== GPIO Libraries/API ===
 +
====Install [[Rockpi4/dev/libmraa | Libmraa]] ====

Latest revision as of 01:55, 22 May 2019

    ROCK Pi 4 >  Hardware >  GPIO


General purpose input-output (GPIO) connector

ROCK Pi 4 has a 40-pin expansion header. Each pin is distinguished by color.

GPIO number Function2 Function1 GPIO Pin# Pin# GPIO Function1 Function2 GPIO number
+3.3V 1 2 +5.0V
71 I2C7_SDA GPIO2_A7 3 4 +5.0V
72 I2C7_SCL GPIO2_B0 5 6 GND
75 SPI2_CLK GPIO2_B3 7 8 GPIO4_C4 DEBUG_TXD 148
GND 9 10 GPIO4_C3 DEBUG_RXD 147
146 PWM0 GPIO4_C2 11 12 GPIO4_A3 I2S1_SCLK 131
150 PWM1 GPIO4_C6 13 14 GND
149 SPDIF_TX GPIO4_C5 15 16 GPIO4_D2 154
+3.3V 17 18 GPIO4_D4 156
40 UART4_TXD SPI1_TXD GPIO1_B0 19 20 GND
15 UART4_RXD SPI1_RXD GPIO1_A7 21 22 GPIO4_D5 157
41 SPI1_CLK GPIO1_B1 23 24 GPIO1_B2 SPI1_CSn 42
GND 25 26 ADC_IN0
64 I2C2_SDA GPIO2_A0 27 28 GPIO2_A1 I2C2_CLK 65
74 I2C6_SCL SPI2_TXD GPIO2_B2 29 30 GND
73 I2C6_SDA SPI2_RXD GPIO2_B1 31 32 GPIO3_C0 SPDIF_TX UART3_CTSn 112
76 SPI2_CSn GPIO2_B4 33 34 GND
133 I2S1_LRCK_TX GPIO4_A5 35 36 GPIO4_A4 I2S1_LRCK_RX 132
158 GPIO4_D6 37 38 GPIO4_A6 I2S1_SDI 134
GND 39 40 GPIO4_A7 I2S1_SDO 135

IO Voltage

RK3399 have three IO voltages, 1.8V/3.0V/3.3V. For ROCK Pi 4, below is the default voltage:

| GPIO       | Voltage Level | Tolerance |
| ---------- | ------------- | --------- |
| GPIO3_C0   | 3.3V          | 3.465V    |
| ADC_IN0    | 1.8V          | 1.98V     |
| Other GPIO | 3.0V          | 3.14V     |



GPIO number

Rockchip RK3399 GPIO has 5 banks, GPIO0 to GPIO4, 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 GPIO4_D5(PIN22 on 40PIN GPIO) as an example:

   GPIO4_D5 = 32*4 + 8*3 + 5 = 157

To set GPIO4_D5 output

   cd /sys/class/gpio
   echo 157 > export
   cd gpio157
   echo out > direction
   echo 1 > value     # output high
   echo 0 > value     # output low

GPIO Libraries/API

Install Libmraa