Diff: I2CSlaveRtos.h

Revision:

3:967dde37e712

Child:

4:eafa7efcd771

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/I2CSlaveRtos.h	Fri Apr 19 21:33:29 2013 +0000
@@ -0,0 +1,119 @@
+#ifndef I2CSLAVERTOS_H
+#define I2CSLAVERTOS_H
+
+#include "I2CDriver.h"
+
+namespace mbed
+{
+
+/// I2C master interface to the RTOS-I2CDriver.
+/// The interface is compatible to the original mbed I2C class.
+class I2CSlaveRtos
+{
+    I2CDriver m_drv;
+
+public:
+
+    enum RxStatus {
+        NoData         = 0,
+        ReadAddressed  = 1,
+        WriteGeneral   = 2,
+        WriteAddressed = 3
+    };
+
+    /** Create an I2C Slave interface, connected to the specified pins.
+     *
+     *  @param sda I2C data line pin
+     *  @param scl I2C clock line pin
+     */
+    I2CSlaveRtos(PinName sda, PinName scl, int freq=100000, int address=42)
+        :m_drv(sda,scl,100000,address) {}
+
+    /** Set the frequency of the I2C interface
+     *
+     *  @param hz The bus frequency in hertz
+     */
+    void frequency(int hz) {
+        m_drv.frequency(hz);
+    }
+
+    /** Checks to see if this I2C Slave has been addressed.
+     *
+     *  @returns
+     *  A status indicating if the device has been addressed, and how
+     *  - NoData            - the slave has not been addressed
+     *  - ReadAddressed     - the master has requested a read from this slave
+     *  - WriteAddressed    - the master is writing to this slave
+     *  - WriteGeneral      - the master is writing to all slave
+     */
+    int receive(void) {
+        return m_drv.receiveSlave();
+    }
+
+    /** Read from an I2C master.
+     *
+     *  @param data pointer to the byte array to read data in to
+     *  @param length maximum number of bytes to read
+     *
+     *  @returns
+     *       0 on success,
+     *   non-0 otherwise
+     */
+    int read(char *data, int length) {
+        return m_drv.readSlave(data, length);
+    }
+
+    /** Read a single byte from an I2C master.
+     *
+     *  @returns
+     *    the byte read
+     */
+    int read(void) {
+        return m_drv.readSlave();
+    }
+
+    /** Write to an I2C master.
+     *
+     *  @param data pointer to the byte array to be transmitted
+     *  @param length the number of bytes to transmite
+     *
+     *  @returns
+     *       0 on success,
+     *   non-0 otherwise
+     */
+    int write(const char *data, int length) {
+        return m_drv.writeSlave(data, length);
+    }
+
+    /** Write a single byte to an I2C master.
+     *
+     *  @data the byte to write
+     *
+     *  @returns
+     *    '1' if an ACK was received,
+     *    '0' otherwise
+     */
+    int write(int data) {
+        return m_drv.writeSlave(data);
+    }
+
+    /** Sets the I2C slave address.
+     *
+     *  @param address The address to set for the slave (ignoring the least
+     *  signifcant bit). If set to 0, the slave will only respond to the
+     *  general call address.
+     */
+    void address(int address) {
+        m_drv.addressSlave(address);
+    }
+
+
+    /** Reset the I2C slave back into the known ready receiving state.
+     */
+    void stop(void){
+        m_drv.stopSlave();
+    }
+};
+}
+
+#endif
\ No newline at end of file