Axel Utech
Demo for PCF8574
Revision 0:daf4d39b8c98, committed 2014-11-05
- Comitter:
- aAXEe
- Date:
- Wed Nov 05 08:01:34 2014 +0000
- Commit message:
- basic handling working
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
diff -r 000000000000 -r daf4d39b8c98 main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Nov 05 08:01:34 2014 +0000
@@ -0,0 +1,45 @@
+#include "mbed.h"
+
+#define PCF8574_ADDR (0x40)
+
+I2C i2c(I2C_SDA, I2C_SCL);
+
+
+Serial pc(SERIAL_TX, SERIAL_RX);
+
+
+bool pcf8574_write(uint8_t data){
+ return i2c.write(PCF8574_ADDR, (char*) &data, 1, 0) == 0;
+}
+
+bool pcf8574_read(uint8_t* data){
+ return i2c.read(PCF8574_ADDR, (char*) data, 1, 0) == 0;
+}
+
+int pcf8574_test(uint8_t value){
+ int ret;
+ uint8_t data=0;
+
+ ret = pcf8574_write(value);
+ if(!ret) return -1;
+
+ ret = pcf8574_read(&data);
+ if(!ret) return -2;
+
+ return data;
+}
+
+int main()
+{
+
+ printf("Hello PCF8574\n");
+ while (1) {
+ pc.printf("pcf8574_test: low: %i\n", pcf8574_test(0x00));
+ wait(0.5);
+ pc.printf("pcf8574_test: high: %i\n", pcf8574_test(0xff));
+ wait(0.5);
+ }
+
+}
+
+
diff -r 000000000000 -r daf4d39b8c98 mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed Nov 05 08:01:34 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/031413cf7a89 \ No newline at end of file