Revision 8:a5689a2b6af3, committed 2020-01-21

Comitter:

emilywilson

Date:

Tue Jan 21 20:20:16 2020 +0000

Parent:

7:b7720a8623b5

Child:

9:be04caf5f990

Commit message:

part 7 changes

Changed in this revision

--- a/part7.h	Tue Jan 21 20:02:09 2020 +0000
+++ b/part7.h	Tue Jan 21 20:20:16 2020 +0000
@@ -30,8 +30,7 @@
 // Optional software reset - mbed p14 to MCP23S17 reset pin
 // DigitalOut reset(p14);
 
-DigitalOut myled(p26);
-DigitalIn pb(p22);
+int pb;
 
 int run_part7() {
 //  The MCP23S17 reset pin can just be pulled high, since it has a power on reset circuit.
@@ -48,14 +47,13 @@
     chip.direction(PORT_A, 0x00);
 //  Set all 8 Port B bits to input direction
     chip.direction(PORT_B, 0xFF);
-    myled=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 value of pushbutton to Port A
+        pb = chip.read(PORT_B) & 0x01;
         chip.write(PORT_A, !pb);
         wait(.5);
         // read back value from MCP23S17 Port B and display B0 on myled
-        myled = chip.read(PORT_B)& 0x01;
     }
 }