BAT-SD4012_2017
I do it
Revision 0:34f3e96385fa, committed 2017-10-05
- Comitter:
- goodguy8791
- Date:
- Thu Oct 05 18:52:46 2017 +0000
- Commit message:
- I do it
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/MCP23S17.lib Thu Oct 05 18:52:46 2017 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/romilly/code/MCP23S17/#068b1e8909bb
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Thu Oct 05 18:52:46 2017 +0000
@@ -0,0 +1,83 @@
+//NEED TO ADD “MCP23S17.cpp” AND “MCP23S17.h” TO PROJECT FILE
+
+// 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
+//DigitalIn pb(p21);
+int pb;
+
+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
+ */
+
+ pb = chip.read(PORT_B) & 0x01;
+ if(pb == 0){
+ chip.write(PORT_A, 1);
+ }else{
+ chip.write(PORT_A, 0);
+ }
+
+ }
+}
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Thu Oct 05 18:52:46 2017 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/ad3be0349dc5 \ No newline at end of file