Weber Yang
/
ROS_Nucleo_i2c_pcf8574
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Dependencies: mbed ros_lib_kinetic
Fork of
Nucleo_i2c_pcf8574
by 
Axel Utech
Diff: main.cpp
- Revision:
- 0:daf4d39b8c98
- Child:
- 1:b3a2c43439bd
--- /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);
+ }
+
+}
+
+