Diff: AbstractGpioExpender.h

Revision:

0:ebd3a7cc9b92

Child:

1:ec9e770173d5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/AbstractGpioExpender.h	Fri Jan 09 14:37:42 2015 +0000
@@ -0,0 +1,82 @@
+#pragma once
+
+#include <list>
+
+#include <mbed.h>
+
+#define GPA0        0
+#define GPA1        1
+#define GPA2        2
+#define GPA3        3
+#define GPA4        4
+#define GPA5        5
+#define GPA6        6
+#define GPA7        7
+#define GPB0        8
+#define GPB1        9
+#define GPB2        10
+#define GPB3        11
+#define GPB4        12
+#define GPB5        13
+#define GPB6        14
+#define GPB7        15
+#define GPIO_MAX    GPB7
+#define GPIO_MED    GPB0
+#define GPIO_SIZE   8
+
+class AbstractGpioExpender {
+public:
+    /** Interrupt modes
+     */
+    enum InterruptModes {
+        OnChange = 0x00,
+        OnRising = 0x01,
+        OnFalling = 0x03
+    };
+    
+    /** Reset the device
+     */
+    virtual void reset() = 0;
+
+    /** Setup interrupt mechanism for all GPIO ports
+     * @param p_mirroring Set to 0x00 to disable INTA/B mirroring, 0x01 otherwise. Default: 0x00
+     * @param p_openDrain Set to 0x00 for active driver output, 0x01 for opn drain output. Default: 0x00
+     * @param p_polarity Set to 0x00 for interrupt active low, 0x01 otherwise. Default: 0x00
+     */
+    virtual void setupInterrupts(const unsigned char p_mirroring = 0x00, const unsigned char p_openDrain = 0x00, const unsigned char p_polarity = 0x00) = 0;
+    
+    /** Setup interrupt for a specific IO port
+     * @param p_gpioId The IO port identifier
+     * @param p_mode  The interrupt mode
+     * @return 0 on success, negative value otherwise
+     */
+    virtual int setupInterruptPin(const unsigned char p_gpioId, const InterruptModes p_mode = OnRising) = 0;
+    
+    /** Get interrupt information and clear it
+     * @param p_gpioId The IO port identifier where the interrupt occured
+     * @param p_value  The logic value on the pin port where the interrupt occured
+     * @return 0 on success, negative value otherwise
+     */
+    virtual int getLastInterruptPin(unsigned char * p_gpioId, unsigned char * p_value) = 0;
+    
+    /** Attach a function to call when a interrupt occurs on the GPIOA input ports
+     */
+    virtual void setIntrACallback(void (* p_fptr)(void)) = 0;
+    
+    /** Attach a function to call when a rising edge occurs on the input
+     */
+    virtual void setIntrBCallback(void (* p_fptr)(void)) = 0;
+    
+    virtual int read(const unsigned char p_gpioId, unsigned char * p_value) = 0;
+    virtual int write(const unsigned char p_gpioId, const unsigned char p_value) = 0;
+    
+    virtual unsigned char createBus(const std::list<unsigned char> p_lines, const PinMode p_mode = PullNone) = 0;
+    virtual void deleteBus(const unsigned char p_busId) = 0;
+    virtual int busRead(const unsigned char p_busId) = 0;
+    virtual int busWrite(const unsigned char p_busId, const unsigned char p_value) = 0;
+    
+protected:
+    virtual bool writeRegister(const unsigned char p_registerId, const unsigned char p_value) = 0;
+    virtual bool readRegister(const unsigned char p_registerId, unsigned char * p_value) = 0;
+
+}; // End of class AbstractGpioExpender 
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