Diff: main.cpp

Revision:

3:3081585fbce1

Parent:

2:934a0500abde

--- a/main.cpp	Fri Jan 28 02:04:05 2011 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,66 +0,0 @@
-// A simple IO demo using the MCP23S17 library
-//
-// MCP23S17 Library Copyright (c) 2010 Romilly Cocking
-// Released under the MIT License: http://mbed.org/license/mit
-//
-// See http://mbed.org/users/romilly/notebook/mcp23s17-addressable-16-bit-io-expander-with-spi/
-//
-//
-// MCP23S17 datasheet http://ww1.microchip.com/downloads/en/DeviceDoc/21952b.pdf
-// uses MCP23S17 library version 0.4
-
-#include "mbed.h"
-#include "MCP23S17.h"
-// Create SPI bus
-SPI spi(p5, p6, p7);
-// 
-// Wiring Connections:
-// mbed p5,p6,p7 are tied to MCP23S17 SI, SO, SCK pins
-// mbed p20 to MCP23S17 CS
-// MCP23S17 reset pin pulled high
-// MCP23S17 GPA0 connected to GPB0 for loopback test
-// A0, A1, A2 of the MCP23S17  are tied to ground on the breadboard, so the 8-bit address for writes is 0x40
-// This is referred to as the opcode in the device datasheet
-char Opcode = 0x40;
-
-// Next create a MCP23S17
-// mbed p20 is connected to ~chipSelect on the MCP23S17
-MCP23S17 chip = MCP23S17(spi, p20, Opcode);
-
-// Optional software reset - mbed p14 to MCP23S17 reset pin
-// DigitalOut reset(p14);
-
-DigitalOut led1(LED1); // mbed LED1 is used for test status display
-
-int main() {
-//  The MCP23S17 reset pin can just be pulled high, since it has a power on reset circuit.
-//  The reset pin can be used for a software forced reset by pulling it low with an mbed GPIO pin.
-//  But just leave it pulled high for this simple demo code.
-//  After a power on reset, both IO ports default to input mode
-//
-//  Here is the optional code for a software reset
-//  reset = 0;
-//  wait_us(1);
-//  reset = 1;
-//
-//  Set all 8 Port A bits to output direction
-    chip.direction(PORT_A, 0x00);
-//  Set all 8 Port B bits to input direction
-    chip.direction(PORT_B, 0xFF);
-    led1=0;
-//  Start Loopback test sending out and reading back values
-//  loopback test uses A0 and B0 pins - so use a wire to jumper those two pins on MCP23S17 together
-    while (1) {
-        // write 0xAA to MCP23S17 Port A
-        chip.write(PORT_A, 0xAA);
-        wait(.5);
-        // read back value from MCP23S17 Port B and display B0 on mbed led1
-        led1 = chip.read(PORT_B)& 0x01;
-        // write 0x55 to MCP23S17 Port A
-        chip.write(PORT_A, 0x55);
-        wait(.5);
-        // read back value from MCP23S17 Port B and display B0 on mbed led1
-        led1 = chip.read(PORT_B)& 0x01;
-        // led1 should blink slowly when it is all working
-    }
-}