*
* -->
*
- * \brief I2C generic driver functions (interface).
+ * \brief I2C generic driver functions.
*
* \version $Id$
* \author Francesco Sacchi <batt@develer.com>
+ *
+ * $WIZ$ module_name = "i2c"
+ * $WIZ$ module_configuration = "bertos/cfg/cfg_i2c.h"
+ * $WIZ$ module_hw = "bertos/hw/hw_i2c_bitbang.h"
+ * $WIZ$ module_supports = "not atmega103 and not atmega168 and not at91"
*/
+
#ifndef DRV_I2C_H
#define DRV_I2C_H
+#include "cfg/cfg_i2c.h"
#include <cfg/compiler.h>
#define I2C_READBIT BV(0)
-void i2c_init(void);
-bool i2c_start_w(uint8_t id);
-bool i2c_start_r(uint8_t id);
-void i2c_stop(void);
-bool i2c_put(uint8_t _data);
-int i2c_get(bool ack);
+/**
+ * I2C Backends.
+ * Sometimes your cpu does not have a builtin
+ * i2c driver or you don't want, for some reason, to
+ * use that.
+ * With this you can choose, at compile time, which backend to use.
+ *
+ * $WIZ$ i2c_backend = "I2C_BACKEND_BUILTIN", "I2C_BACKEND_BITBANG"
+ */
+#define I2C_BACKEND_BUILTIN 0 ///< Uses cpu builtin i2c driver
+#define I2C_BACKEND_BITBANG 1 ///< Uses emulated bitbang driver
+
+
+/**
+ * I2c builtin prototypes.
+ * Do NOT use these function directly, instead,
+ * you can call the ones named without "_builtin_"
+ * and specify in cfg_i2c.h ( \see CONFIG_I2C_BACKEND)
+ * that you want the builtin backend.
+ * \{
+ */
+void i2c_builtin_init(void);
+bool i2c_builtin_start_w(uint8_t id);
+bool i2c_builtin_start_r(uint8_t id);
+void i2c_builtin_stop(void);
+bool i2c_builtin_put(uint8_t _data);
+int i2c_builtin_get(bool ack);
+/*\}*/
+
+/**
+ * I2c bitbang prototypes.
+ * Same thing here: do NOT use these function directly, instead,
+ * you can call the ones named without "_bitbang_"
+ * and specify in cfg_i2c.h ( \see CONFIG_I2C_BACKEND)
+ * that you want the bitbang backend.
+ * \{
+ */
+void i2c_bitbang_init(void);
+bool i2c_bitbang_start_w(uint8_t id);
+bool i2c_bitbang_start_r(uint8_t id);
+void i2c_bitbang_stop(void);
+bool i2c_bitbang_put(uint8_t _data);
+int i2c_bitbang_get(bool ack);
+/*\}*/
+
+#if CONFIG_I2C_BACKEND == I2C_BACKEND_BUILTIN
+ #define i2c_init i2c_builtin_init
+ #define i2c_start_w i2c_builtin_start_w
+ #define i2c_start_r i2c_builtin_start_r
+ #define i2c_stop i2c_builtin_stop
+ #define i2c_put i2c_builtin_put
+ #define i2c_get i2c_builtin_get
+#elif CONFIG_I2C_BACKEND == I2C_BACKEND_BITBANG
+ #define i2c_init i2c_bitbang_init
+ #define i2c_start_w i2c_bitbang_start_w
+ #define i2c_start_r i2c_bitbang_start_r
+ #define i2c_stop i2c_bitbang_stop
+ #define i2c_put i2c_bitbang_put
+ #define i2c_get i2c_bitbang_get
+#else
+ #error Unsupported i2c backend.
+#endif
+
bool i2c_send(const void *_buf, size_t count);
bool i2c_recv(void *_buf, size_t count);