[Banana pi Accessories] BPI-IO extend Board and how to use it


(bpi team) #1

Product Overview: This module is designed specifically for the Banana Pi IO expansion modules, which can effectively solve the banana send IO port insufficient. Module uses four 74HC595 chips to expand 32 IO ports. As shown above, the top of the module will expand the IO of Banana Pi again that can be cascaded for more IO expansion modules can theoretically unlimited expansion.

Product Features: Expanded 32 GPIO Infinity connection for the same module Use wiringPi API ,sample code

Port: Banana Pi 2X13 port Banana Pi 2X13 cascade port Q0-Q31 expanded IO port

Product Parameters: Working voltage: 2.4V-5V IO voltage: 3.3V Expanded 32 unidirectional IO Connection through SPI 100 MHz (typical) shift out frequency 8-bit serial input 8-bit serial or parallel output Specified from -40C to +85C and from -40C to +125C

Typical Application: Drive the lattice screen Driver numeric display Drive matrix LED

how to connect:

test code: use 3 port you can driver it ,also need include VCC and GND。

ST24    SPI0_CS0    PI10 

SH23    SPI0_CLK    PI11 

DS19   SPI0_MOSI    PI12 

test code:

unit SR595; 

{$mode objfpc}{$H+} 

interface 

  uses Classes, SysUtils, GPIO; 

type 

  TSR595 = class 

  private 

    FDS: TGPIO; //MOSI 

    FSH: TGPIO; //CLK 

    FST: TGPIO; //CS 

  public 

    constructor Create; 

    destructor Destroy; override; 

    procedure Write(B: Byte); overload; 

    procedure Write(B: array of Byte; Len: Byte); overload; 

    procedure Send; 

end; 

implementation 

constructor TSR595.Create; 

begin 

  inherited Create; 

  FDS:= TGPIO.Create(PI, 12); 

  with FDS do 

  begin 

    Fun:= Fun1; 

    Data:= True; 

  end; 

  FSH:= TGPIO.Create(PI, 11); 

  with FSH do 

  begin 

    Fun:= Fun1; 

    Pull:= PULL_UP; 

    Data:= True; 

  end; 

  FST:= TGPIO.Create(PI, 10); 

  with FST do 

  begin 

    Fun:= Fun1; 

    Pull:= PULL_UP; 

    Data:= True; 

  end; 

end; 

destructor TSR595.Destroy; 

begin 

  FDS.Free; 

  FSH.Free; 

  FST.Free; 

  inherited Destroy; 

end; 

procedure TSR595.Write(B: Byte); overload; 

var I: Byte; 

begin 

  //FST.Data:= False; 

  for I:= 0 to 7 do 

  begin 

    FSH.Data:= False; 

    FDS.Data:= ((B and $80) > 0); 

    B:= B shl 1; 

    FSH.Data:= True; 

  end; 

  //FST.Data:= True; 

end; 

procedure TSR595.Write(B: array of Byte; Len: Byte); overload; 

var I: Byte; 

begin 

  for I:= 0 to Len - 1 do Write(B[I]); 

end; 

procedure TSR595.Send; 

begin 

  FST.Data:= False; 

  FST.Data:= True; 

end; 

end. 

you also can use wiringpi to do this .


(Edmilson Junior) #2

Do you know how can i use this on a bpi m64 running android?