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Difference between revisions of "Rockpi4/dev/libmraa"

< Rockpi4‎ | dev
(Created page with "{{rockpi4_header}} {{Languages|rockpi4/dev/libmraa}} ROCK Pi 4 > Development > Install Libmraa = Libmraa...")
 
Line 42: Line 42:
  
 
== Enable interface ==  
 
== 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:
+
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:
 
15 GPIO:
 
     PIN07    GPIO2_B3
 
     PIN07    GPIO2_B3
Line 226: Line 227:
 
     0xaa
 
     0xaa
 
     0xaa
 
     0xaa
 +
    ......
  
 
===test pwm===
 
===test pwm===
Line 264: Line 266:
 
     root@localhost:~# chmod +x pwm.py  
 
     root@localhost:~# chmod +x pwm.py  
 
     root@localhost:~# ./pwm.py
 
     root@localhost:~# ./pwm.py
−
 
−
 
−
 
  
 
===test uart===
 
===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.
 +
use ssh connect to rockpi4,we must have 2 window,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

Revision as of 08:57, 15 March 2019

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       ROCK Pi 4 >  Development >  Install Libmraa


Libmraa-rockpi4

Below is the instructions of how to install libmraa.

Install essential packages

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

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

   apt-get install rockchip-overlay rockchip-fstab 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 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       I2C7_SDA
   PIN5       I2C7_SCL
   PIN27      I2C2_SCL
   PIN28      I2C2_SCL

1 SPI: 

   PIN19      SPI1_MOSI
   PIN21      SPI1_MISO
   PIN23      SPI1_CLK
   PIN24      SPI1_CS0

1 UART: 

   PIN8       UART2_TX
   PIN10      UART2_RX

2 PWM: 

   PIN11      PWM0
   PIN13      PWM1

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=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

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_word(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. use ssh connect to rockpi4,we must have 2 window,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
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