AT91SAM7A3. I2C basic support added.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@4819 35acf78f-673a-0410-8e92-d51de3d6d3f4

1 files changed, 208 insertions, 0 deletions

diff --git a/os/hal/platforms/AT91SAM7/i2c_lld.h b/os/hal/platforms/AT91SAM7/i2c_lld.h
new file mode 100755
index 000000000..cf7d2705c
--- /dev/null
+++ b/os/hal/platforms/AT91SAM7/i2c_lld.h
@@ -0,0 +1,208 @@
+/*

+    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,

+                 2011,2012 Giovanni Di Sirio.

+

+    This file is part of ChibiOS/RT.

+

+    ChibiOS/RT is free software; you can redistribute it and/or modify

+    it under the terms of the GNU General Public License as published by

+    the Free Software Foundation; either version 3 of the License, or

+    (at your option) any later version.

+

+    ChibiOS/RT is distributed in the hope that it will be useful,

+    but WITHOUT ANY WARRANTY; without even the implied warranty of

+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+    GNU General Public License for more details.

+

+    You should have received a copy of the GNU General Public License

+    along with this program.  If not, see <http://www.gnu.org/licenses/>.

+*/

+/*

+   Concepts and parts of this file have been contributed by Uladzimir Pylinsky

+   aka barthess.

+ */

+

+/**

+ * @file    SAM72/i2c_lld.h

+ * @brief   SAM72 I2C subsystem low level driver header.

+ *

+ * @addtogroup I2C

+ * @{

+ */

+

+#ifndef _I2C_LLD_H_

+#define _I2C_LLD_H_

+

+#if HAL_USE_I2C || defined(__DOXYGEN__)

+

+/*===========================================================================*/

+/* Driver constants.                                                         */

+/*===========================================================================*/

+

+/**

+ * @brief   Peripheral clock frequency.

+ */

+#define I2C_CLK_FREQ  ((STM32_PCLK1) / 1000000)

+

+/*===========================================================================*/

+/* Driver pre-compile time settings.                                         */

+/*===========================================================================*/

+

+/**

+ * @name    Configuration options

+ * @{

+ */

+/**

+ * @brief   I2C1 driver enable switch.

+ * @details If set to @p TRUE the support for I2C1 is included.

+ * @note    The default is @p FALSE.

+ */

+#if !defined(SAM7_I2C_USE_I2C1) || defined(__DOXYGEN__)

+#define SAM7_I2C_USE_I2C1              FALSE

+#endif

+

+/**

+ * @brief   I2C1 interrupt priority level setting.

+ */

+#if !defined(SAM7_I2C_I2C1_IRQ_PRIORITY) || defined(__DOXYGEN__)

+#define SAM7_I2C_I2C1_IRQ_PRIORITY     (AT91C_AIC_PRIOR_HIGHEST - 2)

+#endif

+

+/** @} */

+

+/*===========================================================================*/

+/* Derived constants and error checks.                                       */

+/*===========================================================================*/

+

+/** @brief  error checks */

+#if !SAM7_I2C_USE_I2C1

+#error "I2C driver activated but no I2C peripheral assigned"

+#endif

+

+/*===========================================================================*/

+/* Driver data structures and types.                                         */

+/*===========================================================================*/

+

+/**

+ * @brief   Type representing I2C address.

+ */

+typedef uint16_t i2caddr_t;

+

+/**

+ * @brief   I2C Driver condition flags type.

+ */

+typedef uint32_t i2cflags_t;

+

+/**

+ * @brief Driver configuration structure.

+ */

+typedef struct {

+  /**

+   * @brief   CWGR regitster content.

+   */

+  uint32_t                  cwgr;

+} I2CConfig;

+

+/**

+ * @brief   Type of a structure representing an I2C driver.

+ */

+typedef struct I2CDriver I2CDriver;

+

+/**

+ * @brief Structure representing an I2C driver.

+ */

+struct I2CDriver{

+  /**

+   * @brief   Driver state.

+   */

+  i2cstate_t                state;

+  /**

+   * @brief   Current configuration data.

+   */

+  const I2CConfig           *config;

+  /**

+   * @brief   Error flags.

+   */

+  i2cflags_t                errors;

+  /**

+   * @brief   Pointer to receive buffer.

+   */

+  uint8_t                   *rxbuf;

+  /**

+   * @brief   Pointer to transmit buffer.

+   */

+  const uint8_t             *txbuf;

+  /**

+   * @brief   Bytes count to be received.

+   */

+  size_t                    rxbytes;

+  /**

+   * @brief   Bytes count to be transmitted.

+   */

+  size_t                    txbytes;

+#if I2C_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)

+#if CH_USE_MUTEXES || defined(__DOXYGEN__)

+  /**

+   * @brief   Mutex protecting the bus.

+   */

+  Mutex                     mutex;

+#elif CH_USE_SEMAPHORES

+  Semaphore                 semaphore;

+#endif

+#endif /* I2C_USE_MUTUAL_EXCLUSION */

+#if defined(I2C_DRIVER_EXT_FIELDS)

+  I2C_DRIVER_EXT_FIELDS

+#endif

+  /* End of the mandatory fields.*/

+  /**

+   * @brief   Thread waiting for I/O completion.

+   */

+  Thread                    *thread;

+};

+

+/*===========================================================================*/

+/* Driver macros.                                                            */

+/*===========================================================================*/

+

+/**

+ * @brief   Get errors from I2C driver.

+ *

+ * @param[in] i2cp      pointer to the @p I2CDriver object

+ *

+ * @notapi

+ */

+#define i2c_lld_get_errors(i2cp) ((i2cp)->errors)

+

+/*===========================================================================*/

+/* External declarations.                                                    */

+/*===========================================================================*/

+

+#if !defined(__DOXYGEN__)

+#if SAM7_I2C_USE_I2C1

+extern I2CDriver I2CD1;

+#endif

+

+#endif /* !defined(__DOXYGEN__) */

+

+#ifdef __cplusplus

+extern "C" {

+#endif

+  void i2c_lld_init(void);

+  void i2c_lld_start(I2CDriver *i2cp);

+  void i2c_lld_stop(I2CDriver *i2cp);

+  msg_t i2c_lld_master_transmit_timeout(I2CDriver *i2cp, i2caddr_t addr,

+                                        const uint8_t *txbuf, size_t txbytes,

+                                        uint8_t *rxbuf, size_t rxbytes,

+                                        systime_t timeout);

+  msg_t i2c_lld_master_receive_timeout(I2CDriver *i2cp, i2caddr_t addr,

+                                       uint8_t *rxbuf, size_t rxbytes,

+                                       systime_t timeout);

+#ifdef __cplusplus

+}

+#endif

+

+#endif /* HAL_USE_I2C  */

+

+#endif /* _I2C_LLD_H_ */

+

+/** @} */