HANLLEL at 19:47, 19 March 2019

2019-03-19T19:47:58Z

HANLLEL at 19:12, 19 March 2019

2019-03-19T19:12:53Z

HANLLEL: Created page with "{{rockpi4_header}} {{Languages|rockpi4/dev/libmraa}} ROCK Pi 4 > Desarrollando > rockpi4/dev/libmraa/es_es | Instalar L..."

2019-03-19T19:10:36Z

Created page with "{{rockpi4_header}} {{Languages|rockpi4/dev/libmraa}} ROCK Pi 4 > Desarrollando > rockpi4/dev/libmraa/es_es | Instalar L..."

New page

{{rockpi4_header}}

{{Languages|rockpi4/dev/libmraa}}

[[rockpi4/es_es | ROCK Pi 4]] > [[rockpi4/dev/es_es | Desarrollando]] > [[rockpi4/dev/libmraa/es_es | Instalar Libmraa ]]

= Libmraa-rockpi4 =

Estas son las instrucciones para saber instalar '''libmraa'''.

== Install essential packages ==

Edit your /etc/apt/sources.list and add the following:

'''For Debian Stretch'''

deb http://apt.radxa.com/stretch/ stretch main

'''For Ubuntu bionic'''

deb http://apt.radxa.com/bionic/ bionic main

Get the pub key
wget -O - apt.radxa.com/stretch/public.key | sudo apt-key add -

Update
sudo apt-get update && sudo apt-get upgrade

Install essential packages:
sudo apt-get install -y rockchip-overlay rockchip-fstab && sudo apt-get install -y rockpi4-dtbo

== Install the latest u-boot and kernel==
apt-get install rockpi4b-rk-u-boot-lastest

Manually run the u-boot flash script
/usr/local/sbin/rockpi4b_upgrade_bootloader.sh

Type '''YES''' to perform the uboot.img flashing.

then install kernel
apt-get install linux-base
apt-get install linux-4.4-lastest

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.

== Enable interface ==
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:

15 GPIO:
PIN07 GPIO2_B3
PIN12 GPIO4_A3
PIN15 GPIO4_C5
PIN16 GPIO4_D2
PIN18 GPIO4_D4
PIN22 GPIO4_D5
PIN29 GPIO2_B2
PIN31 GPIO2_B1
PIN32 GPIO3_C0
PIN33 GPIO2_B4
PIN35 GPIO4_A5
PIN36 GPIO4_A4
PIN37 GPIO4_D6
PIN38 GPIO4_A6
PIN40 GPIO4_A7
2 I2C:
PIN3 I2C'''7'''_SDA
PIN5 I2C'''7'''_SCL
PIN27 I2C'''2'''_SCL
PIN28 I2C'''2'''_SCL
1 SPI:
PIN19 SPI'''1'''_MOSI
PIN21 SPI'''1'''_MISO
PIN23 SPI'''1'''_CLK
PIN24 SPI'''1'''_CS0
1 UART:
PIN8 UART'''2'''_TX
PIN10 UART'''2'''_RX
2 PWM:
PIN11 PWM'''0'''
PIN13 PWM'''1'''

modify '''/boot/hw_intfc.conf''' to enable '''pwm0,pwm1,spi1,i2c2,i2c7''' for test
root@localhost:/# cat boot/hw_intfc.conf

# Hardware Interface Config

# For more details, check file /usr/local/share/doc/rockpi4-dtbo/README

# Uncomment configuration line if you use it. Take i2c6 as an example,
# setting off disables i2c6 bus and setting on enables i2c6 bus.

'''intfc:pwm0=on'''
'''intfc:pwm1=on'''
intfc:uart2=off
intfc:uart4=off
'''intfc:spi1=on'''
intfc:spi2=off
'''intfc:i2c2=on'''
intfc:i2c6=off
'''intfc:i2c7=on'''

# DTS Overlay Config
# 1. check the name.dtbo in /boot/overlays
# 2. add intfc:dtoverlay=name as below

#intfc:dtoverlay=at24c02
#intfc:dtoverlay=two-color-led
#intfc:dtoverlay=console-disabled
#intfc:dtoverlay=console-on-uart4
root@localhost:/#
then '''reboot'''

==Install libmraa-rockpi4==

apt-get install libmraa-rockpi4

==Test==
===test gpio===

Use '''mraa-gpio''' tool to test

root@localhost:~# mraa-gpio list
07 GPIO2_B3: GPIO
12 GPIO4_A3: GPIO
15 GPIO4_C5: GPIO
16 GPIO4_D2: GPIO
18 GPIO4_D4: GPIO
22 GPIO4_D5: GPIO
29 GPIO2_B2: GPIO
31 GPIO2_B1: GPIO
32 GPIO3_C0: GPIO
33 GPIO2_B4: GPIO
35 GPIO4_A5: GPIO
36 GPIO4_A4: GPIO
37 GPIO4_D6: GPIO
38 GPIO4_A6: GPIO
40 GPIO4_A7: GPIO
root@localhost:~# mraa-gpio set 40 1 //pin40 pull high
root@localhost:~# mraa-gpio set 40 0 //pin40 pull low
root@localhost:~#
===test i2c===
Use '''mraa-i2c''' tool to test,we must have a i2c slave device,for example,we use I2C EEPROM:
root@localhost:~# mraa-i2c list
Bus 0: id=07 type=linux default
Bus 1: id=02 type=linux
root@localhost:~# mraa-i2c detect 0 //device on bus 0
00: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: 50 51 52 53 54 55 56 57 -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
root@localhost:~# mraa-i2c detect 1 //no device on bus 1
00: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
root@localhost:~# mraa-i2c set 0 0x50 0x10 0x55 //write
Device 50, Register = 10, Value = 55
root@localhost:~# mraa-i2c get 0 0x50 0x10 //read
Register 0X10 = 0X55
root@localhost:~#

===test spi===
use '''c''' to test spi,compile spi.c
root@localhost:~# cat spi.c
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>

/* mraa header */
#include "mraa/spi.h"

/* SPI declaration */
#define SPI_BUS 0

/* SPI frequency in Hz */
#define SPI_FREQ 400000
int
main(int argc, char** argv)
{
mraa_result_t status = MRAA_SUCCESS;
mraa_spi_context spi;
int i, j;

/* initialize mraa for the platform (not needed most of the times) */
mraa_init();

//! [Interesting]
/* initialize SPI bus */
spi = mraa_spi_init(SPI_BUS);
if (spi == NULL) {
fprintf(stderr, "Failed to initialize SPI\n");
mraa_deinit();
return EXIT_FAILURE;
}

/* set SPI frequency */
status = mraa_spi_frequency(spi, SPI_FREQ);
if (status != MRAA_SUCCESS)
goto err_exit;

/* set big endian mode */
status = mraa_spi_lsbmode(spi, 0);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
while(1) {
printf("0x%x\n",mraa_spi_write(spi, 0xaa));
}
err_exit:
mraa_result_print(status);

/* stop spi */
mraa_spi_stop(spi);

/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();

return EXIT_FAILURE;
}
root@localhost:~# gcc spi.c -lmraa
then short '''pin19''' and '''pin21''' and run a.out
root@localhost:~# ./a.out
0xaa
0xaa
......

===test pwm===

for pwm python test,should install python and libpython2.7

apt-get install libpython2.7 python

use python script follow:

root@localhost:~# cat pwm.py
#!/usr/bin/env python
# Example Usage: Generates PWM at a step rate of 0.01 continuously.
import mraa
import time

x = mraa.Pwm(11) # pin11 pwm0
# x = mraa.Pwm(13) # pin13 pwm1
x.period_us(700)
x.enable(True)

value= 0.0

while True:
x.write(value)

time.sleep(0.05)

value = value + 0.01
if value >= 1:
value = 0.0
root@localhost:~#

then run pwm.py

root@localhost:~# ls
pwm.py
root@localhost:~# chmod +x pwm.py
root@localhost:~# ./pwm.py

===test uart===
Disable console and enable uart2 for uart test
root@localhost:/# cat boot/hw_intfc.conf

# Hardware Interface Config

# For more details, check file /usr/local/share/doc/rockpi4-dtbo/README

# Uncomment configuration line if you use it. Take i2c6 as an example,
# setting off disables i2c6 bus and setting on enables i2c6 bus.

intfc:pwm0=on
intfc:pwm1=on
'''intfc:uart2=on'''
intfc:uart4=off
intfc:spi1=on
intfc:spi2=off
intfc:i2c2=on
intfc:i2c6=off
intfc:i2c7=off

# DTS Overlay Config
# 1. check the name.dtbo in /boot/overlays
# 2. add intfc:dtoverlay=name as below

#intfc:dtoverlay=at24c02
#intfc:dtoverlay=two-color-led
'''intfc:dtoverlay=console-disabled'''
#intfc:dtoverlay=console-on-uart4
root@localhost:/#
then '''reboot''' and short '''pin8''' and '''pin10'''.
use ssh connect to rockpi4,we must have 2 windows,one is for send data,anothor is for receive.

send command follow:
sudo mraa-uart dev 0 baud 1500000 send data
receive command follow:
sudo mraa-uart dev 0 baud 1500000 recv 1000

the receive window will show the data

@@ Line 1: / Line 1: @@
-{{rockpi4_header}}
+{{Languages|rockpi4/dev/Debian}}
-{{Languages|rockpi4/dev/libmraa}}
         [[rockpi4/es_es | ROCK Pi 4]] > [[rockpi4/dev/es_es | Desarrollando]] > [[rockpi4/dev/libmraa/es_es  | Instalar Libmraa ]]
@@ Line 313: / Line 315: @@
 the receive window will show the data

Rockpi4/dev/libmraa/es es - Revision history

HANLLEL at 19:47, 19 March 2019

HANLLEL at 19:12, 19 March 2019

HANLLEL: Created page with "{{rockpi4_header}} {{Languages|rockpi4/dev/libmraa}} ROCK Pi 4 > Desarrollando > rockpi4/dev/libmraa/es_es | Instalar L..."