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Difference between revisions of "RockpiS/dev/libmraa"

< RockpiS‎ | dev
(UART test)
(UART test)
Line 226: Line 226:
 
ROCK Pi S V1.2 provides 3 UART,There are  '''uart0''' ,'''uart1''', '''uart2'''. If you need the uatr function, you can turn on one or more of them.
 
ROCK Pi S V1.2 provides 3 UART,There are  '''uart0''' ,'''uart1''', '''uart2'''. If you need the uatr function, you can turn on one or more of them.
  
Firstly, Disable console and enable uart0 for uart test.modify the '''/boot/uEnv.txt''' file to add the following
+
Firstly, Disable console and enable '''uart0''' for uart test.modify the '''/boot/uEnv.txt''' file to add the following
 
   root@rockpis:~# cat /boot/uEnv.txt  
 
   root@rockpis:~# cat /boot/uEnv.txt  
 
   verbosity=7
 
   verbosity=7
Line 238: Line 238:
 
   initrdimg=initrd.img-4.4.143-47-rockchip-g495ff574976c
 
   initrdimg=initrd.img-4.4.143-47-rockchip-g495ff574976c
 
   kernelimg=vmlinuz-4.4.143-47-rockchip-g495ff574976c
 
   kernelimg=vmlinuz-4.4.143-47-rockchip-g495ff574976c
 +
 +
then reboot . use ssh connect to rockpis,we must have 2 windows,one is for send data,anothor is for receive.
 +
 +
send command follow:
 +
    rock@rockpis:~$ sudo mraa-uart dev 0 baud 1500000 send  radxa
 +
 +
Another window sets the baud  1500000 and receives the data
 +
    radxa
 +
 +
receive command follow:
 +
    rock@rockpis:~$  sudo mraa-uart dev 0 baud 1500000 recv  1000
 +
    radxa
  
 
===== SPI test =====
 
===== SPI test =====

Revision as of 08:23, 23 April 2020

    ROCK Pi S >  Development >  Install Libmraa 

Libmraa on ROCK Pi S

This guide describes how to use libmraa on ROCK Pi S.

Install essential packages

Package libmraa is in the Radxa APT bionic-testing and buster-testing repositories.

Execute the following commands to add Radxa APT

rock@rockpis:~$ export DISTRO=bionic-testing      # for Bionic

or

rock@rockpis:~$ export DISTRO=buster-testing      # for Buster
rock@rockpis:~$ echo "deb http://apt.radxa.com/$DISTRO/ ${DISTRO%-*} main" | sudo tee -a /etc/apt/sources.list.d/apt-radxa-com.list

Get the pub key

rock@rockpis:~$  wget -O -  apt.radxa.com/buster-testing/public.key | sudo apt-key add -

Install essential packages:

rock@rockpis:~$ sudo apt-get update
rock@rockpis:~$ sudo apt-get install -y rockchip-overlay rockpis-dtbo libmraa # libmraa version: >=0.4
rock@rockpis:~$ sudo apt-get install -y linux-4.4-rockpis-latest # ROCK Pi S kernel version: >= 4.4.143-47

Enable interface

See ROCK Pi S GPIO pintout. ROCK Pi S has a 26-pin colorful expansion header. Each pin is distinguished by color. mraa define is shown below:

Hardware V12

16 GPIO:

   PIN03      GPIO2_A2
   PIN05      GPIO2_B0
   PIN07      GPIO2_B3
   PIN09      GPIO4_C4
   PIN11      GPIO4_C2
   PIN12      GPIO4_A3
   PIN13      GPIO4_C6
   PIN15      GPIO4_C5
   PIN16      GPIO4_D2
   PIN18      GPIO4_D4
   PIN19      GPIO1_B0
   PIN21      GPIO1_A7
   PIN22      GPIO4_D5
   PIN23      GPIO1_B1
   PIN24      GPIO1_B2
   PIN26      GPIO1_B2

3 I2C:

   PIN23      I2C0_SDA
   PIN24      I2C0_SCL
   PIN3       I2C1_SCL
   PIN5       I2C1_SDA
   PIN13      I2C3_SDA
   PIN15      I2C3_SCL
  

1 SPI:

   PIN19      SPI2TX        //must disable i2c0
   PIN21      SPI2RX        //must disable i2c0
   PIN23      SPI2CLK
   PIN24      SPI2CSN

3 UART:

   PIN8       UART0_TX
   PIN10      UART0_RX
   PIN23      UART1_TX
   PIN24      UART1_RX
   PIN19      UART2_RX
   PIN21      UART2_TX

2 PWM:

   PIN11      PWM2
   PIN13      PWM3

1 ADC:

   PIN26      ADC_IN0          //the measure voltage must lower than 1.8v

For those ROCK Pi S system images released after March 1st, 2020, to enable pwm2,pwm3,uart1,uart2,i2c0,i2c1,i2c3 and so overlays=, need to follow Device tree overlays.

For those ROCK Pi S system images released before March 1st, 2020, modify /boot/uEnv.txt to enable pwm2,pwm3,uart1,uart2,i2c0,i2c1,i2c3 for test.

rock@rockpis:~$ cat /boot/uEnv.txt
verbosity=7
overlay_prefix=rockchip
rootfstype=ext4
fdtfile=rockchip/rk3308-rock-pi-s.dtb
overlays=rk3308-console-on-uart0 rk3308-i2c0 rk3308-i2c1 rk3308-i2c3
rootuuid=37055840-4ec4-444f-979b-9e47ee4bd848
initrdsize=0x64d1d4
kernelversion=4.4.143-47-rockchip-g495ff574976c
initrdimg=initrd.img-4.4.143-47-rockchip-g495ff574976c
kernelimg=vmlinuz-4.4.143-47-rockchip-g495ff574976c

Test

Package libmraa provides some examples for testing spi, uart, i2c, gpio, etc. We way use the c files in /usr/local/share/mraa/examples/c.

And we copy them to home directory.

rock@rockpis:~/mraa-examples$ cp -av /usr/local/share/mraa/examples/c /home/rock/mraa-examples

You should pay more attention to the Black Bold words when modifying configuration file /boot/uEnv.txt.

test gpio

Use mraa-gpio tool to test

   root@rockpis:~# mraa-gpio list
   01         3V3: 
   02          5V: 
   03     I2C_SDA: GPIO I2C  
   04          5V: 
   05     I2C_SCL: GPIO I2C  
   06         GND: 
   07 I2S0_8CH_MC: GPIO 
   08    UART0_TX: GPIO UART 
   09         GND: 
   10    UART0_RX: GPIO UART 
   11 PWM2,I2C3_S: GPIO I2C  PWM  
   12 I2S0_8CH_SC: GPIO 
   13 PWM3,I2C3_S: GPIO I2C  PWM  
   14         GND: 
   15    SPDIF_TX: GPIO 
   16 I2S0_8CH_SD: GPIO 
   17         3V3: 
   18 I2S0_8CH_SD: GPIO 
   19 UART1_RTSN,: GPIO SPI  UART 
   20         GND: 
   21 UART1_CTSN,: GPIO SPI  UART 
   22 I2S0_8CH_LR: GPIO 
   23 UART1_RX,I2: GPIO I2C  SPI  UART 
   24 UART1_TX,I2: GPIO I2C  SPI  UART 
   25         GND: 
   26     ADC_IN0: AIO 
   root@rockpis:~# mraa-gpio set 15 1           #pin15 pull high
   root@rockpis:~# mraa-gpio set 15 0           #pin15 pull high
PWM test

ROCK Pi S V1.2 provides 2 PWM, PWM2 and PWM3. It is necessary to enable PWM1, PWM2 and PWM3 at the same time if you need PWM function.

Firstly, modify the /boot/uEnv.txt file to add the following

root@rockpis:~# cat /boot/uEnv.txt
verbosity=7
overlay_prefix=rockchip
rootfstype=ext4
fdtfile=rockchip/rk3308-rock-pi-s.dtb
overlays=rk3308-console-on-uart0 rk3308-pwm1 rk3308-pwm2 rk3308-pwm3
rootuuid=37055840-4ec4-444f-979b-9e47ee4bd848
initrdsize=0x64d1d4
kernelversion=4.4.143-47-rockchip-g495ff574976c
initrdimg=initrd.img-4.4.143-47-rockchip-g495ff574976c
kernelimg=vmlinuz-4.4.143-47-rockchip-g495ff574976c


Modify the macro PWM in /home/rock/mraa-examples/pwm.c as follows to test PWM2. To test PWM3, change #define PWM 11 to #define PWM 13.

/* PWM declaration */
#define PWM 11

Save and compile pwm.c

rock@rockpis:~/mraa-examples$ gcc -o pwm pwm.c -lmraa
rock@rockpis:~/mraa-examples$ sudo ./pwm 
PWM value is 0.010015
PWM value is 0.019985
PWM value is 0.030000
PWM value is 0.040014
PWM value is 0.049984
PWM value is 0.059999
I2C test

ROCK Pi S V1.2 provides 3 I2C,There are I2C0 ,I2C1, I2C3. If you need the I2C function, you can turn on one or more of them.

Firstly, modify the /boot/uEnv.txt file to add the following

root@rockpis:~# cat /boot/uEnv.txt
verbosity=7
overlay_prefix=rockchip
rootfstype=ext4
fdtfile=rockchip/rk3308-rock-pi-s.dtb
overlays=rk3308-console-on-uart0  rk3308-i2c0 rk3308-i2c1 rk3308-i2c3
rootuuid=37055840-4ec4-444f-979b-9e47ee4bd848
initrdsize=0x64d1d4
kernelversion=4.4.143-47-rockchip-g495ff574976c
initrdimg=initrd.img-4.4.143-47-rockchip-g495ff574976c
kernelimg=vmlinuz-4.4.143-47-rockchip-g495ff574976c

We use MPU6050 tets i2c. Modify the macro MPU6050 in /home/rock/mraa-examples/i2c_mpu6050.c ,as follows to test I2C0. To test I2C1 and I2C3, change #define I2C_BUS 0 to #define I2C_BUS 1 or#define I2C_BUS 3 .

  /* mraa header */
  #include "mraa/i2c.h"
  #define I2C_BUS 0
  

Save and compile pwm.c

rock@rockpis:~/mraa-examples$ gcc -o i2c_mpu6050 i2c_mpu6050.c  -lmraa
rock@rockpis:~/mraa-examples$ sudo ./i2c_mpu6050
accel: x:0 y:0 z:0
gyro: x:-10 y:1 z:7
  
accel: x:0 y:0 z:0
gyro: x:107 y:-12 z:69
   
accel: x:0 y:0 z:0
gyro: x:6 y:136 z:-50
   
accel: x:0 y:0 z:0
gyro: x:-5 y:48 z:-103
     
accel: x:0 y:0 z:0
gyro: x:3 y:3 z:5
UART test

ROCK Pi S V1.2 provides 3 UART,There are uart0 ,uart1, uart2. If you need the uatr function, you can turn on one or more of them.

Firstly, Disable console and enable uart0 for uart test.modify the /boot/uEnv.txt file to add the following

  root@rockpis:~# cat /boot/uEnv.txt 
  verbosity=7
  overlay_prefix=rockchip
  rootfstype=ext4
  fdtfile=rockchip/rk3308-rock-pi-s.dtb
  overlays=rk3308-uart0 rk3308-uart1 rk3308-uart2
  rootuuid=c3800af9-fa58-4fb3-bb56-e52fd04837ba
  initrdsize=0x5c96c3
  kernelversion=4.4.143-47-rockchip-g495ff574976c
  initrdimg=initrd.img-4.4.143-47-rockchip-g495ff574976c
  kernelimg=vmlinuz-4.4.143-47-rockchip-g495ff574976c

then reboot . use ssh connect to rockpis,we must have 2 windows,one is for send data,anothor is for receive.

send command follow:

    rock@rockpis:~$ sudo mraa-uart dev 0 baud 1500000 send  radxa

Another window sets the baud 1500000 and receives the data

   radxa

receive command follow:

   rock@rockpis:~$  sudo mraa-uart dev 0 baud 1500000 recv  1000
   radxa
SPI test

Firstly, modify the /boot/uEnv.txt file.

root@rockpis:~# cat /boot/uEnv.txt
verbosity=7
overlay_prefix=rockchip
rootfstype=ext4
fdtfile=rockchip/rk3308-rock-pi-s.dtb
overlays=rk3308-console-on-uart0 rk3308-spi-spidev
param_spidev_spi_bus=2
rootuuid=37055840-4ec4-444f-979b-9e47ee4bd848
initrdsize=0x64d1d4
kernelversion=4.4.143-47-rockchip-g495ff574976c
initrdimg=initrd.img-4.4.143-47-rockchip-g495ff574976c
kernelimg=vmlinuz-4.4.143-47-rockchip-g495ff574976c

then execute command, sync, followed by reboot.

Create file test-spi.c and add the following contents.

  rock@rockpis:~/mraa-examples$ cat test-spi.c 
  #include <signal.h>
  #include <stdlib.h>
  #include <unistd.h>
  
  /* mraa header */
  #include "mraa/spi.h"
  
  /* SPI declaration */
  #define SPI_BUS 2
  
  /* SPI frequency in Hz */
  #define SPI_FREQ 10000000
  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;
      }
     
      j = 10;
      while(j) {
    	j--;
          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;
  }
  rock@rockpis:~/mraa-examples$ gcc -o test-spi test-spi.c -lmraa

Then short pin19 and pin21 and run test-spi

rock@rockpis:~/mraa-examples$ sudo ./test-spi 
0xaa
0xaa
0xaa
0xaa
0xaa
0xaa
0xaa
0xaa
0xaa
0xaa
MRAA: SUCCESS
ADC test

connect signal you want to measure, and then compile mraa example c file, aio.c, to test.

rock@rockpis:~/mraa-examples$ gcc aio aio.c -lmraa
rock@rockpis:~/mraa-examples$ sudo ./aio
ADC A0 read 1A5 - 421
ADC A0 read float - 0.41153
ADC A0 read 1A5 - 421
ADC A0 read float - 0.41153
ADC A0 read 1A5 - 421
ADC A0 read float - 0.41153
ADC A0 read 1A5 - 421
ADC A0 read float - 0.41153

Development

More introduction of libmraa can look at libmraa official website.

Troubleshooting