Diff: TCA9538.h

Revision:

0:b6e63b82937d

Child:

1:6d5227745d28

diff -r 000000000000 -r b6e63b82937d TCA9538.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TCA9538.h	Tue Jul 30 13:44:13 2019 +0000
@@ -0,0 +1,53 @@
+#ifndef TCA9538_H
+#define TCA9538_H
+
+#include "mbed.h"
+
+/**
+ * @brief Class for TCA9538 IO-Expander
+ * 
+ * The TCA9538 is an 8-bit IO-Expander from Texas Instruments.
+ * 
+ * <h2>Example</h2>
+ * <code>
+ * #include "mbed.h"
+ * #include "TCA9538.h"
+ * 
+ * I2C         i2c(p9, p10);
+ * DigitalOut  io_exp_reset(p11);
+ * TCA9538     io_exp(i2c,0x70);
+ * 
+ * int main(void)
+ * {
+ *   io_exp_reset = 1;  //turn IO-Expander on
+ *   io_exp.set(TCA9538::CONFIG, 0x0F); //Bits 0-3 Inputs ; Bits 4-7 Outputs
+ * 
+ *   io_exp.set(TCA9538::OUTPUT, 0xF0); //Turn all output pins on
+ *   while(1)
+ *   {
+ *     uint8_t input_value = io_exp.get(TCA9538::OUTPUT);
+ *   }
+ * }
+ * </code>
+ */
+class TCA9538{
+public:
+  enum tca9538_registers_t
+  {
+    INPUT     = 0x00,
+    OUTPUT    = 0x01,
+    POLARITY  = 0x02,
+    CONFIG    = 0x03
+  };
+
+  bool    set(tca9538_registers_t index, uint8_t value);
+  uint8_t get(tca9538_registers_t index);
+
+  TCA9538(I2C& i2c_device, uint8_t address);
+
+private:
+  uint8_t m_i2c_address;
+  I2C&    m_i2c_device;
+};
+
+#endif /* */