*
* -->
*
- * \brief I2C generic driver functions (interface).
+ * \brief I2C generic driver functions.
*
- * \version $Id$
* \author Francesco Sacchi <batt@develer.com>
*
- * $WIZARD_MODULE = {
- * "name" : "i2c",
- * "depends" : [],
- * "configuration" : "bertos/cfg/cfg_i2c.h"
- * }
+ * $WIZ$ 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>
+#include <cfg/macros.h>
+#include <cfg/debug.h>
+
+#include <cpu/attr.h>
#define I2C_READBIT BV(0)
+#if COMPILER_C99
+ #define i2c_init(...) PP_CAT(i2c_init ## _, COUNT_PARMS(__VA_ARGS__)) (__VA_ARGS__)
+#else
+ #define i2c_init(args...) PP_CAT(i2c_init ## _, COUNT_PARMS(args)) (args)
+#endif
+
/**
* I2C Backends.
* Sometimes your cpu does not have a builtin
* use that.
* With this you can choose, at compile time, which backend to use.
*
- * $WIZARD_LIST = {
- * "i2c_backend" : ["I2C_BACKEND_BUILTIN", "I2C_BACKEND_BITBANG"]
- * }
+ * $WIZ$ 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
+#if 0
/**
* I2c builtin prototypes.
/*\}*/
#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
+ #define i2c_init_0 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
+ #define i2c_init_0 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);
#endif
+
+/*
+ * I2c new api
+ *
+ */
+#define I2C_OK 0
+#define I2C_ARB_LOST BV(2)
+#define I2C_START_TIMEOUT BV(0)
+#define I2C_NO_ACK BV(1)
+
+
+
+#define I2C_NOSTOP 0
+#define I2C_STOP BV(0)
+#define I2C_START_R BV(1)
+#define I2C_START_W 0
+
+
+#define I2C_TEST_START(flag) ((flag) & I2C_START_R)
+
+struct I2cHardware;
+struct I2c;
+
+typedef void (*i2c_start_t)(struct I2c *i2c, uint16_t slave_addr);
+typedef uint8_t (*i2c_get_t)(struct I2c *i2c);
+typedef void (*i2c_put_t)(struct I2c *i2c, uint8_t data);
+typedef void (*i2c_send_t)(struct I2c *i2c, const void *_buf, size_t count);
+typedef void (*i2c_recv_t)(struct I2c *i2c, void *_buf, size_t count);
+
+typedef struct I2cVT
+{
+ i2c_start_t start;
+ i2c_get_t get;
+ i2c_put_t put;
+ i2c_send_t send;
+ i2c_recv_t recv;
+} I2cVT;
+
+typedef struct I2c
+{
+ int errors;
+ int flags;
+ size_t xfer_size;
+ struct I2cHardware* hw;
+ const struct I2cVT *vt;
+} I2c;
+
+
+#include CPU_HEADER(i2c)
+
+INLINE void i2c_start(I2c *i2c, uint16_t slave_addr, size_t size)
+{
+ ASSERT(i2c->vt);
+ ASSERT(i2c->vt->start);
+ ASSERT(i2c->xfer_size == 0);
+
+ i2c->errors = 0;
+ i2c->xfer_size = size;
+
+ i2c->vt->start(i2c, slave_addr);
+}
+
+INLINE void i2c_start_r(I2c *i2c, uint16_t slave_addr, size_t size, int flags)
+{
+ ASSERT(i2c);
+ i2c->flags = flags | I2C_START_R;
+ i2c_start(i2c, slave_addr, size);
+}
+
+INLINE void i2c_start_w(I2c *i2c, uint16_t slave_addr, size_t size, int flags)
+{
+ ASSERT(i2c);
+ i2c->flags = flags & ~I2C_START_R;
+ i2c_start(i2c, slave_addr, size);
+}
+
+INLINE uint8_t i2c_get(I2c *i2c)
+{
+ ASSERT(i2c);
+ ASSERT(i2c->vt);
+ ASSERT(i2c->vt->get);
+
+ ASSERT(i2c->xfer_size >= 1);
+
+ ASSERT(I2C_TEST_START(i2c->flags) == I2C_START_R);
+
+ if (!i2c->errors)
+ return i2c->vt->get(i2c);
+ else
+ return 0xFF;
+}
+
+INLINE void i2c_put(I2c *i2c, uint8_t data)
+{
+ ASSERT(i2c);
+ ASSERT(i2c->vt);
+ ASSERT(i2c->vt->put);
+
+ ASSERT(i2c->xfer_size >= 1);
+
+ ASSERT(I2C_TEST_START(i2c->flags) == I2C_START_W);
+
+ if (!i2c->errors)
+ i2c->vt->put(i2c, data);
+}
+
+INLINE void i2c_send(I2c *i2c, const void *_buf, size_t count)
+{
+ ASSERT(i2c);
+ ASSERT(i2c->vt);
+ ASSERT(i2c->vt->send);
+
+ ASSERT(_buf);
+ ASSERT(count);
+ ASSERT(count <= i2c->xfer_size);
+
+ ASSERT(I2C_TEST_START(i2c->flags) == I2C_START_W);
+
+ if (!i2c->errors)
+ i2c->vt->send(i2c, _buf, count);
+}
+
+
+INLINE void i2c_recv(I2c *i2c, void *_buf, size_t count)
+{
+ ASSERT(i2c);
+ ASSERT(i2c->vt);
+ ASSERT(i2c->vt->recv);
+
+ ASSERT(_buf);
+ ASSERT(count);
+ ASSERT(count <= i2c->xfer_size);
+
+ ASSERT(I2C_TEST_START(i2c->flags) == I2C_START_R);
+
+ if (!i2c->errors)
+ i2c->vt->recv(i2c, _buf, count);
+}
+
+INLINE int i2c_error(I2c *i2c)
+{
+ ASSERT(i2c);
+ int err = i2c->errors;
+ i2c->errors = 0;
+ return err;
+}
+
+INLINE void i2c_init_3(I2c *i2c, int dev, uint32_t clock)
+{
+ i2c_hw_init(i2c, dev, clock);
+}
+
+#endif