Banana Pi

Bananarama

Bananallama

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

In appearance the Banana Pi is similar to the 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 Raspberry Pi compatible GPIO header with 26 pins.

                   +--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
                   +--------+

This is the relationship between the Banana Pi IO, RPi GPIO, A20 I/O and the Linux sysfs interface.

Banana Pi IO CON3 pin Raspberry Pi GPIO A20 I/Osysfs
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).

  ______________________________________________________
 /                                                     /
+-----------------------------------------------------+
| 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
+-------------------------___-------------------------+

The above ribbon header naming is the port and pin for A20 I/O.

  ______________________________________________________
 /                                                     /
+-----------------------------------------------------+
| 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
+-------------------------___-------------------------+

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

Pickle Microchip PIC ICSP

Along with USB serial we can use the BPi GPIOs to program PICMicros using Pickle Microchip PIC ICSP.

Memory mapped I/O can be used to drive the GPIOs, however, the GPIO bit-bang driver for Linux may also be utilised on the BPi if preferred.

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)

 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=BPI
 or
DEVICE=/dev/gpio-bb

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