Diff: main.cpp

Revision:

1:d7fe22a24841

Parent:

0:d58b942de71e

Child:

2:2e8fca65efaf

--- a/main.cpp	Sat Aug 21 14:49:00 2010 +0000
+++ b/main.cpp	Sat Aug 21 16:51:33 2010 +0000
@@ -10,17 +10,19 @@
 
 char writeOpcode = 0x40; // A0, A1, A2 are tied to ground on the breadboard.
 MCP23S17 chip = MCP23S17(spi, p20, 0x40);
-DigitalOut chipA0(p12);
-DigitalIn  chipB0(p10);
+DigitalInOut chipA0(p12);
+DigitalInOut  chipB0(p10);
 
 void checkEqual(int expected, int actual, char * text) {
     if (expected != actual) {
-        printf("%s **TEST FAILED** - expected %i but get %i", text, expected, actual);
+        printf("%s **TEST FAILED** - expected %i but get %i\r\n", text, expected, actual);
         exit(-1);
     }
 }
 
 int main() {
+    chipA0.output(); // output from the mbed
+    chipB0.input();   // input to the mbed
     for (int i = 0; i < 100; i++) {
         chip.directionA(0xFF); // all 8 bits set to input
         chip.directionB(0xFE); // bit 0 set to output
@@ -29,7 +31,24 @@
         chip.outputB(chip.inputA() && 1);
         checkEqual(1, int(chipB0),"copying 1 from A0 to B0");
         // copy input bit 0 from A to output bit 0 on B
+        chipA0 = 0;
         chip.outputB(chip.inputA() && 1);
-        checkEqual(1, int(chipB0), "copying 0 from A0 to B0");
+        checkEqual(0, int(chipB0), "copying 0 from A0 to B0");
     }
+    
+    chipB0.output(); // output from the mbed
+    chipA0.input();   // input to the mbed
+     for (int i = 0; i < 100; i++) {
+        chip.directionB(0xFF); // all 8 bits set to input
+        chip.directionA(0xFE); // bit 0 set to output
+        chipB0 = 1;
+        // copy input bit 0 from B to output bit 0 on A
+        chip.outputA(chip.inputB() && 1);
+        checkEqual(1, int(chipB0),"copying 1 from B0 to A0");
+        // copy input bit 0 from B to output bit 0 on A
+        chipB0 = 0;
+        chip.outputA(chip.inputB() && 1);
+        checkEqual(0, int(chipB0), "copying 0 from B0 to A0");
+    }
+    
 }