Ken: /* PWM test */

2022-01-14T06:52:26Z

‎PWM test

Ken at 08:15, 9 December 2021

2021-12-09T08:15:25Z

Ken at 06:51, 9 December 2021

2021-12-09T06:51:25Z

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Ken: Created page with "{{rock3_header}} {{Languages|rock3/dev/libmraa}} ROCK 3 > Development > Install Libmraa === Libmraa on ROCK 3 ===..."

2021-12-09T02:39:03Z

Created page with "{{rock3_header}} {{Languages|rock3/dev/libmraa}} ROCK 3 > Development > Install Libmraa === Libmraa on ROCK 3 ===..."

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{{rock3_header}}

{{Languages|rock3/dev/libmraa}}

[[rock3 | ROCK 3]] > [[rock3/dev | Development]] > [[rock3/dev/libmraa | Install Libmraa ]]

=== Libmraa on ROCK 3 ===

This guide describes how to use libmraa on ROCK 3.

@@ Line 362: / Line 362: @@
   rootfstype=ext4
   fdtfile=rockchip/rk3568-rock-3-a.dtb
-  overlays=rk3568-pwm8-m0-fan '''rk3568-pwm1-m0'''
+  overlays=rk3568-pwm8-m0-fan '''rk3568-pwm1-m0'''              #rk3568-pwm8-m0-fan should be here to use pwm fan.
   rootuuid=ee2ce23a-e0b1-4625-a54b-6ce12c167e97
   initrdsize=0x81bfa9

@@ Line 5: / Line 5: @@
      [[rock3 | ROCK 3]] > [[rock3/dev | Development]] > [[rock3/dev/libmraa  | Install Libmraa ]]
-=== Libmraa on ROCK 3 ===
+=== Libmraa on ROCK 3A ===
-This guide describes how to use libmraa on ROCK 3.
+This guide describes how to use libmraa on ROCK 3  to access GPIO, SPI, and other peripherals.
 === Install essential packages ===
-Edit your /etc/apt/sources.list.d/apt-radxa-com.list as following:
+Prebuilt libmraa is located in our Radxa APT Focal and Buster repositories.
-* '''For Debian Buster'''
+Update your <code>/etc/apt/sources.list.d/apt-radxa-com.list</code> accordingly to enable Radxa APT repository.
-    deb http://apt.radxa.com/buster-stable/ buster main
-    deb http://apt.radxa.com/buster-testing/ buster main
-* '''For Ubuntu Focal'''
-    deb http://apt.radxa.com/focal-stable/ focal main
-    deb http://apt.radxa.com/focal-testing/ focal main
-−
-Get the pub key
 * '''For Debian Buster'''
-    wget -O -  apt.radxa.com/buster-testing/public.key | sudo apt-key add -
+  deb http://apt.radxa.com/buster-stable/ buster main
 * '''For Ubuntu Focal'''
-    wget -O -  apt.radxa.com/focal-testing/public.key | sudo apt-key add -
+  deb http://apt.radxa.com/focal-stable/ focal main
+  deb http://apt.radxa.com/focal-testing/ focal main
-Update
-    sudo apt-get update
-Install essential packages:
+Update and install libmraa
-    sudo apt-get install -y rockchip-overlay && sudo apt-get install -y linux-4.19-rock-3-latest
+ sudo apt-get update
 ==== Enable interface ====
@@ Line 109: / Line 106: @@
      PIN37      ADC_IN5          //the measure voltage must lower than 1.8v
-When using, you need to pay attention to the pin's multiplexing function to see if there is a conflict.
+Since many peripherals are reusing the same physical pin, all but one has to be disabled to allow proper functionality. While in a normal PC user can easily disable or enable peripherals in their UEFI firmware, currently there is no such universal equivalent in ARM world. Instead, Device tree blobs (dtb) and Device tree overlays (dtbo) are used to inform Linux kernel the existence of external devices. Please refer to [[Device-tree-overlays#Part_One:_Rockchip | this guide]] on available dtbo for ROCK 3A. Please read those carefully or you may get an unbootable system.
-==== 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.
+==== Run libmraa tests ====
 And we copy them to home directory.
@@ Line 225: / Line 225: @@
 ===== UART test =====
-ROCK 3A V1.3 provides 6 UART,There are  '''uart0''' ,'''uart3''', '''uart5''', '''uart7''', '''uart8''', '''uart9''' .
+ROCK 3A V1.3 provides 6 UART,There are  '''uart0''' ,'''uart3''', '''uart5''', '''uart7''', '''uart8''', '''uart9'''.
 If you need the uart function, you can turn on one or more of them.
@@ Line 255: / Line 255: @@
 ===== SPI test =====
-Firstly, modify the '''/boot/uEnv.txt''' file.
+Change overlays in /boot/uEnv.txt and reboot
   root@rock3a:~# cat /boot/uEnv.txt
@@ Line 351: / Line 351: @@
 ===== PWM test =====
-ROCK 3A V1.3 provides 7 PWM, '''but only one PWM function can be used at a time currently'''.
+ROCK 3A V1.3 provides 7 PWM, there are '''pwm1-m0''', '''pwm1-m1''', '''pwm2-m0''', '''pwm2-m1''', '''pwm9-m0''', '''pwm12-m1''', '''pwm13-m1''', '''pwm14-m0''', '''pwm14-m1''', '''pwm15-m0''', '''pwm15-m1'''.
 Firstly, modify the /boot/uEnv.txt file to add the following

Rock3/dev/libmraa - Revision history

Ken: /* PWM test */

Ken at 08:15, 9 December 2021

Ken at 06:51, 9 December 2021

Ken: Created page with "{{rock3_header}} {{Languages|rock3/dev/libmraa}} ROCK 3 > Development > Install Libmraa === Libmraa on ROCK 3 ===..."