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| − | {{rockpi4_header}}
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| − | {{Languages|rockpi4/dev/libmraa}}
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| − |
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| − | [[rockpi4 | ROCK Pi 4]] > [[rockpi4/dev | Development]] > [[rockpi4/dev/libmraa | Install Libmraa ]]
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| − |
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| − |
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| − | = Libmraa-rockpi4 =
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| − |
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| − | Below is the instructions of how to install '''libmraa'''.
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| − |
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| − | == Install essential packages ==
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| − |
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| − | Edit your /etc/apt/sources.list and add the following:
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| − |
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| − | deb http://apt.radxa.com/stretch/ stretch main
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| − |
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| − | Get the pub key
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| − | wget -O - apt.radxa.com/stretch/public.key | sudo apt-key add -
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| − |
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| − | Update
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| − | sudo apt-get update && sudo apt-get upgrade
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| − |
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| − | Install essential packages:
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| − | apt-get install rockchip-overlay rockchip-fstab rockpi4-dtbo
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| − |
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| − | == Install the latest u-boot and kernel==
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| − | apt-get install rockpi4b-rk-u-boot-lastest
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| − |
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| − | Manually run the u-boot flash script
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| − | /usr/local/sbin/rockpi4b_upgrade_bootloader.sh
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| − |
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| − |
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| − | Type '''YES''' to perform the uboot.img flashing.
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| − |
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| − | then install kernel
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| − | apt-get install linux-base
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| − | apt-get install linux-4.4-lastest
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| − |
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| − |
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| − | After installation, check file '''/boot/extlinux/extlinux.conf'''. It lists all kernel version installed in ROCK Pi. The kernel corresponding to the first label is the newest version and the first boot option.
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| − |
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| − | == Enable interface ==
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| − | See rockpi4 [[Rockpi4/hardware/rockpi4#gpio | GPIO pinout]],ROCK Pi 4 has a 40-pin expansion header. Each pin is distinguished by color. mraa define follow:
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| − |
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| − | 15 GPIO:
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| − | PIN07 GPIO2_B3
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| − | PIN12 GPIO4_A3
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| − | PIN15 GPIO4_C5
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| − | PIN16 GPIO4_D2
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| − | PIN18 GPIO4_D4
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| − | PIN22 GPIO4_D5
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| − | PIN29 GPIO2_B2
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| − | PIN31 GPIO2_B1
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| − | PIN32 GPIO3_C0
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| − | PIN33 GPIO2_B4
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| − | PIN35 GPIO4_A5
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| − | PIN36 GPIO4_A4
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| − | PIN37 GPIO4_D6
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| − | PIN38 GPIO4_A6
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| − | PIN40 GPIO4_A7
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| − | 2 I2C:
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| − | PIN3 I2C'''7'''_SDA
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| − | PIN5 I2C'''7'''_SCL
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| − | PIN27 I2C'''2'''_SCL
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| − | PIN28 I2C'''2'''_SCL
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| − | 1 SPI:
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| − | PIN19 SPI'''1'''_MOSI
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| − | PIN21 SPI'''1'''_MISO
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| − | PIN23 SPI'''1'''_CLK
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| − | PIN24 SPI'''1'''_CS0
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| − | 1 UART:
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| − | PIN8 UART'''2'''_TX
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| − | PIN10 UART'''2'''_RX
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| − | 2 PWM:
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| − | PIN11 PWM'''0'''
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| − | PIN13 PWM'''1'''
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| − |
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| − | modify '''/boot/hw_intfc.conf''' to enable '''pwm0,pwm1,spi1,i2c2,i2c7''' for test
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| − | root@localhost:/# cat boot/hw_intfc.conf
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| − |
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| − | # Hardware Interface Config
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| − |
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| − | # For more details, check file /usr/local/share/doc/rockpi4-dtbo/README
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| − |
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| − | # Uncomment configuration line if you use it. Take i2c6 as an example,
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| − | # setting off disables i2c6 bus and setting on enables i2c6 bus.
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| − |
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| − | '''intfc:pwm0=on'''
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| − | '''intfc:pwm1=on'''
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| − | intfc:uart2=off
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| − | intfc:uart4=off
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| − | '''intfc:spi1=on'''
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| − | intfc:spi2=off
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| − | '''intfc:i2c2=on'''
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| − | intfc:i2c6=off
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| − | '''intfc:i2c7=on'''
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| − |
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| − | # DTS Overlay Config
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| − | # 1. check the name.dtbo in /boot/overlays
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| − | # 2. add intfc:dtoverlay=name as below
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| − |
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| − | #intfc:dtoverlay=at24c02
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| − | #intfc:dtoverlay=two-color-led
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| − | #intfc:dtoverlay=console-disabled
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| − | #intfc:dtoverlay=console-on-uart4
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| − | root@localhost:/#
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| − | then '''reboot'''
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| − |
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| − | ==Install libmraa-rockpi4==
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| − |
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| − | apt-get install libmraa-rockpi4
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| − |
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| − | ==Test==
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| − | ===test gpio===
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| − |
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| − | Use '''mraa-gpio''' tool to test
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| − |
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| − | root@localhost:~# mraa-gpio list
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| − | 07 GPIO2_B3: GPIO
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| − | 12 GPIO4_A3: GPIO
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| − | 15 GPIO4_C5: GPIO
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| − | 16 GPIO4_D2: GPIO
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| − | 18 GPIO4_D4: GPIO
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| − | 22 GPIO4_D5: GPIO
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| − | 29 GPIO2_B2: GPIO
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| − | 31 GPIO2_B1: GPIO
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| − | 32 GPIO3_C0: GPIO
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| − | 33 GPIO2_B4: GPIO
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| − | 35 GPIO4_A5: GPIO
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| − | 36 GPIO4_A4: GPIO
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| − | 37 GPIO4_D6: GPIO
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| − | 38 GPIO4_A6: GPIO
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| − | 40 GPIO4_A7: GPIO
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| − | root@localhost:~# mraa-gpio set 40 1 //pin40 pull high
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| − | root@localhost:~# mraa-gpio set 40 0 //pin40 pull low
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| − | root@localhost:~#
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| − | ===test i2c===
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| − | Use '''mraa-i2c''' tool to test,we must have a i2c slave device,for example,we use I2C EEPROM:
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| − | root@localhost:~# mraa-i2c list
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| − | Bus 0: id=07 type=linux default
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| − | Bus 1: id=02 type=linux
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| − | root@localhost:~# mraa-i2c detect 0 //device on bus 0
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| − | 00: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
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| − | 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
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| − | 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
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| − | 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
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| − | 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
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| − | 50: 50 51 52 53 54 55 56 57 -- -- -- -- -- -- -- --
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| − | 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
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| − | 70: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
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| − | root@localhost:~# mraa-i2c detect 1 //no device on bus 1
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| − | 00: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
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| − | 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
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| − | 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
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| − | 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
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| − | 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
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| − | 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
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| − | 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
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| − | 70: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
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| − | root@localhost:~# mraa-i2c set 0 0x50 0x10 0x55 //write
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| − | Device 50, Register = 10, Value = 55
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| − | root@localhost:~# mraa-i2c get 0 0x50 0x10 //read
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| − | Register 0X10 = 0X55
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| − | root@localhost:~#
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| − |
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| − | ===test spi===
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| − | use '''c''' to test spi,compile spi.c
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| − | root@localhost:~# cat spi.c
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| − | #include <signal.h>
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| − | #include <stdlib.h>
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| − | #include <unistd.h>
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| − |
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| − | /* mraa header */
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| − | #include "mraa/spi.h"
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| − |
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| − | /* SPI declaration */
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| − | #define SPI_BUS 0
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| − |
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| − | /* SPI frequency in Hz */
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| − | #define SPI_FREQ 400000
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| − | int
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| − | main(int argc, char** argv)
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| − | {
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| − | mraa_result_t status = MRAA_SUCCESS;
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| − | mraa_spi_context spi;
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| − | int i, j;
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| − |
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| − | /* initialize mraa for the platform (not needed most of the times) */
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| − | mraa_init();
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| − |
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| − | //! [Interesting]
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| − | /* initialize SPI bus */
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| − | spi = mraa_spi_init(SPI_BUS);
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| − | if (spi == NULL) {
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| − | fprintf(stderr, "Failed to initialize SPI\n");
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| − | mraa_deinit();
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| − | return EXIT_FAILURE;
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| − | }
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| − |
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| − | /* set SPI frequency */
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| − | status = mraa_spi_frequency(spi, SPI_FREQ);
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| − | if (status != MRAA_SUCCESS)
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| − | goto err_exit;
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| − |
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| − | /* set big endian mode */
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| − | status = mraa_spi_lsbmode(spi, 0);
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| − | if (status != MRAA_SUCCESS) {
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| − | goto err_exit;
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| − | }
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| − | while(1) {
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| − | printf("0x%x\n",mraa_spi_write(spi, 0xaa));
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| − | }
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| − | err_exit:
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| − | mraa_result_print(status);
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| − |
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| − | /* stop spi */
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| − | mraa_spi_stop(spi);
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| − |
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| − | /* deinitialize mraa for the platform (not needed most of the times) */
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| − | mraa_deinit();
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| − |
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| − | return EXIT_FAILURE;
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| − | }
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| − | root@localhost:~# gcc spi.c -lmraa
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| − | then short '''pin19''' and '''pin21''' and run a.out
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| − | root@localhost:~# ./a.out
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| − | 0xaa
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| − | 0xaa
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| − | ......
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| − |
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| − | ===test pwm===
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| − |
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| − | for pwm python test,should install python and libpython2.7
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| − |
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| − | apt-get install libpython2.7 python
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| − |
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| − | use python script follow:
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| − |
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| − | root@localhost:~# cat pwm.py
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| − | #!/usr/bin/env python
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| − | # Example Usage: Generates PWM at a step rate of 0.01 continuously.
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| − | import mraa
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| − | import time
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| − |
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| − | x = mraa.Pwm(11) # pin11 pwm0
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| − | # x = mraa.Pwm(13) # pin13 pwm1
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| − | x.period_us(700)
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| − | x.enable(True)
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| − |
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| − | value= 0.0
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| − |
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| − | while True:
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| − | x.write(value)
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| − |
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| − | time.sleep(0.05)
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| − |
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| − | value = value + 0.01
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| − | if value >= 1:
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| − | value = 0.0
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| − | root@localhost:~#
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| − |
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| − | then run pwm.py
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| − |
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| − | root@localhost:~# ls
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| − | pwm.py
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| − | root@localhost:~# chmod +x pwm.py
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| − | root@localhost:~# ./pwm.py
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| − |
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| − | ===test uart===
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| − | Disable console and enable uart2 for uart test
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| − | root@localhost:/# cat boot/hw_intfc.conf
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| − |
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| − | # Hardware Interface Config
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| − |
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| − | # For more details, check file /usr/local/share/doc/rockpi4-dtbo/README
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| − |
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| − | # Uncomment configuration line if you use it. Take i2c6 as an example,
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| − | # setting off disables i2c6 bus and setting on enables i2c6 bus.
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| − |
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| − | intfc:pwm0=on
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| − | intfc:pwm1=on
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| − | '''intfc:uart2=on'''
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| − | intfc:uart4=off
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| − | intfc:spi1=on
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| − | intfc:spi2=off
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| − | intfc:i2c2=on
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| − | intfc:i2c6=off
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| − | intfc:i2c7=off
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| − |
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| − | # DTS Overlay Config
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| − | # 1. check the name.dtbo in /boot/overlays
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| − | # 2. add intfc:dtoverlay=name as below
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| − |
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| − | #intfc:dtoverlay=at24c02
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| − | #intfc:dtoverlay=two-color-led
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| − | '''intfc:dtoverlay=console-disabled'''
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| − | #intfc:dtoverlay=console-on-uart4
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| − | root@localhost:/#
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| − | then '''reboot''' and short '''pin8''' and '''pin10'''.
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| − | use ssh connect to rockpi4,we must have 2 windows,one is for send data,anothor is for receive.
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| − |
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| − | send command follow:
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| − | sudo mraa-uart dev 0 baud 1500000 send data
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| − | receive command follow:
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| − | sudo mraa-uart dev 0 baud 1500000 recv 1000
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| − |
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| − | the receive window will show the data
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