==== Banana Pi ====
<wrap right>
{{:boards:bpi.jpg?200|Bananarama}}
\\ \\
{{:boards:bpi-3.jpg?200|Bananallama}}
</wrap>

The Banana Pi is a Linux compatible computer with high speed GPIO.

In appearance the Banana Pi is similar to the [[boards:rpi|Raspberry Pi]] but the hardware is different. The Banana Pi uses the AllWinner A20 whereas the RPi uses the Broadcom BCM2835.

=== GPIO ===
The board has a [[boards:rpi|Raspberry Pi]] compatible GPIO header with 26 pins.

<code>
                   +--CON3--+
3V3                01      02 5V
I2C-SDA2       B21 03      04 5V
I2C-SCL2       B20 05      06 GND
GPCLK     IO-7 I03 07      08 H00       UART3-TX
GND                09      10 H01       UART3-RX
UART2 RX  IO-0 I19 11      12 H02 IO-1
UART2 TX  IO-2 I18 13      14 GND
UART2 CTS IO-3 I17 15      16 H20 IO-4    CAN TX
3V3                17      18 H21 IO-5    CAN RX
SPI0 MOSI      I12 19      20 GND
SPI0 MISO      I13 21      22 I16 IO-6 UART2 RTS
SPI0 SCLK      I11 23      24 I10       SPI0 CE0
GND                25      26 I14       SPI0 CE1
                   +--------+
</code>

This is the relationship between the Banana Pi IO, [[:boards:rpi|RPi]] GPIO, A20 I/O and the Linux sysfs interface.

^Banana Pi IO ^ CON3 pin ^ Raspberry Pi GPIO^ A20 I/O^sysfs|
| 0 | 11 | 17 | I19 | 275 |
| 1 | 12 | 18 | H02 | 226 |
| 2 | 13 | 21/27 | I18 | 274 |
| 3 | 15 | 22 | I17 | 273 |
| 4 | 16 | 23 | H20 | 244 |
| 5 | 18 | 24 | H21 | 245 |
| 6 | 22 | 25 | I16 | 272 |
| 7 | 7  | 4  | I03 | 259 |    

The BPi IO designation is also used by WiringPi.

A ribbon cable may be used to extend the GPIOs. In this instance a female presentation will be given (see picture).
<code>
  ______________________________________________________
 /                                                     /
+-----------------------------------------------------+
| I14 I10 I16  0V H21 H20  0V  H2  H1  H0  0V  5V  5V |
|                                                     |
|                                                     |
|  0V I11 I13 I12  3V I17 I18 I19  0V  I3 B20 B21  3V | 1
+-------------------------___-------------------------+
</code>
The above ribbon header naming is the port and pin for A20 I/O.

<code>
  ______________________________________________________
 /                                                     /
+-----------------------------------------------------+
| 270 266 272  0V 245 244  0V 226 225 224  0V  5V  5V |
|                                                     |
|                                                     |
|  0V 267 269 268  3V 273 274 275  0V 259  52  53  3V | 1
+-------------------------___-------------------------+
</code>

The above ribbon header numbering is for the Linux sysfs interface.

Alternatively, a GPIO extension cable may present male pins as
follows.

<code>
  ______________________________________________________
 /                                                     /
+-----------------------------------------------------+
|  0V 267 269 268  3V 273 274 275  0V 259  52  53  3V | 1
|                                                     |
|                                                     |
| 270 266 272  0V 245 244  0V 226 225 224  0V  5V  5V |
+-------------------------___-------------------------+
</code>



=== Pickle Microchip PIC ICSP ===

Along with USB serial we can use the BPi GPIOs to program PICMicros using [[projects:pickle|Pickle Microchip PIC ICSP]].

Install [[projects:gpio-bb|GPIO bit-bang driver for Linux]].

== Low Voltage Programming with VPP at 3V3 ==

Low voltage ICSP at 3V3 can be performed directly from the BPi GPIOs.

The following connections refer to the BPi GPIO header. Ensure that power is only ever applied from GPIO 3V3 on PIN 1 and never 5V.

Single common data I/O connection (BPi or GPIO bit-bang driver)
<code>
 BPi A20                           PICMicro       GPIO header     .pickle
 =======                           ========       ===========     =======

 3V3-------------------------------VDD--+         PIN 1
                                        |
 GND-------------------------------VSS  R1        PIN 6
                                        |
 I14-----------R3-470R-------------VPP--+         PIN 26          VPP=270

 I10-----------R4-470R-------------PGC            PIN 24          PGC=266

 I16-----------R5-470R-------------PGD            PIN 22          PGD=272

 I11-----------R6-470R-------------PGM--R2-+      PIN 23          PGM=267
                                           |
                                          ///
(R1) 10K !MCLR pull-up
(R2) 10K where appropriate (PGM is not present on all devices).
(R3..R6) 470R.

DEVICE=GPIO-BB
IFACE=/dev/gpio-bb
</code>

===Issues===

Excessive CPU load can be seen in kernel process
`events_freezable_power'

This has been seen in Debian BOOKWORM and goes back
some time.

Add the following to rc.local to solve this

<code>
rmmod sun4i_gpadc sun4i_gpadc_iio
</code>

NB blacklisting doesn't appear to work.
=== Resources ===

[[https://www.armbian.com/bananapi/|Armbian]]

[[http://linux-sunxi.org/A20/PIO|A20 I/O ports]]