Romilly Cocking
/
MCP23S17Test
Library test v 0.4
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"); + } + }