git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@2132 35acf78f-673a-0410-8e92-d51de3d6d3f4

2 files changed, 225 insertions, 0 deletions

diff --git a/os/hal/src/hal.c b/os/hal/src/hal.c
index d2b2fc528..156e75ea9 100644
--- a/os/hal/src/hal.c
+++ b/os/hal/src/hal.c
@@ -60,6 +60,9 @@ void halInit(void) {
 #if CH_HAL_USE_CAN

   canInit();

 #endif

+#if CH_HAL_USE_I2C

+  i2cInit();

+#endif

 #if CH_HAL_USE_MAC

   macInit();

 #endif

diff --git a/os/hal/src/i2c.c b/os/hal/src/i2c.c
new file mode 100644
index 000000000..03d882446
--- /dev/null
+++ b/os/hal/src/i2c.c
@@ -0,0 +1,222 @@
+/*

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

+*/

+

+/**

+ * @file    i2c.c

+ * @brief   I2C Driver code.

+ *

+ * @addtogroup I2C

+ * @{

+ */

+

+#include "ch.h"

+#include "hal.h"

+

+#if CH_HAL_USE_I2C || defined(__DOXYGEN__)

+

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

+/* Driver exported variables.                                                */

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

+

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

+/* Driver local variables.                                                   */

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

+

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

+/* Driver local functions.                                                   */

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

+

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

+/* Driver exported functions.                                                */

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

+

+/**

+ * @brief   I2C Driver initialization.

+ */

+void i2cInit(void) {

+

+  i2c_lld_init();

+}

+

+/**

+ * @brief   Initializes the standard part of a @p I2CDriver structure.

+ *

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

+ */

+void i2cObjectInit(I2CDriver *i2cp) {

+

+  i2cp->i2c_state    = I2C_STOP;

+  i2cp->i2c_config   = NULL;

+}

+

+/**

+ * @brief   Configures and activates the I2C peripheral.

+ *

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

+ * @param[in] config    pointer to the @p I2CConfig object

+ */

+void i2cStart(I2CDriver *i2cp, const I2CConfig *config) {

+

+  chDbgCheck((i2cp != NULL) && (config != NULL), "i2cStart");

+

+  chSysLock();

+  chDbgAssert((i2cp->i2c_state == I2C_STOP) || (i2cp->i2c_state == I2C_READY),

+              "i2cStart(), #1",

+              "invalid state");

+  i2cp->i2c_config = config;

+  i2c_lld_start(i2cp);

+  i2cp->i2c_state = I2C_READY;

+  chSysUnlock();

+}

+

+/**

+ * @brief   Deactivates the I2C peripheral.

+ *

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

+ */

+void i2cStop(I2CDriver *i2cp) {

+

+  chDbgCheck(i2cp != NULL, "i2cStop");

+

+  chSysLock();

+  chDbgAssert((i2cp->i2c_state == I2C_STOP) || (i2cp->i2c_state == I2C_READY),

+              "i2cStop(), #1",

+              "invalid state");

+  i2c_lld_stop(i2cp);

+  i2cp->i2c_state = I2C_STOP;

+  chSysUnlock();

+}

+

+/**

+ * @brief   Initiates a master bus transaction.
+ *

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

+ * @param[in] callback  operation complete callback

+ */

+void i2cMasterStartI(I2CDriver *i2cp, i2ccallback_t callback) {

+

+  chDbgCheck((i2cp != NULL) && (callback != NULL), "i2cMasterStartI");

+  chDbgAssert((i2cp->i2c_state == I2C_READY) || (i2cp->i2c_state == I2C_MREADY),

+              "i2cMasterStartI(), #1", "invalid state");

+

+  i2cp->id_callback = callback;

+  i2c_lld_master_start(i2cp);

+}

+

+/**

+ * @brief   Terminates a master bus transaction.

+ *

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

+ * @param[in] callback  operation complete callback

+ */

+void i2cMasterStopI(I2CDriver *i2cp, i2ccallback_t callback) {

+

+  chDbgCheck((i2cp != NULL) && (callback != NULL), "i2cMasterStopI");

+  chDbgAssert(i2cp->i2c_state == I2C_MREADY,

+              "i2cMasterStopI(), #1", "invalid state");

+

+  i2cp->id_callback = callback;

+  i2c_lld_master_stop(i2cp);

+}

+

+/**

+ * @brief   Master transmission.

+ *

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

+ * @param[in] n         number of bytes to be transmitted

+ * @param[in] txbuf     transmit data buffer pointer

+ * @param[in] callback  operation complete callback

+ */

+void i2cMasterTransmitI(I2CDriver *i2cp, size_t n, const uint8_t *txbuf,

+                        i2ccallback_t callback) {

+

+  chDbgCheck((i2cp != NULL) && (n > 0) &&

+             (txbuf != NULL) && (callback != NULL), "i2cMasterTransmitI");

+  chDbgAssert(i2cp->i2c_state == I2C_MREADY,

+              "i2cMasterTransmitI(), #1", "invalid state");

+

+  i2cp->id_callback = callback;

+  i2c_lld_master_transmit(i2cp, n, txbuf);

+}

+

+/**

+ * @brief   Master receive.

+ *

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

+ * @param[in] n         number of bytes to be transmitted

+ * @param[in] rxbuf     receive data buffer pointer

+ * @param[in] callback  operation complete callback

+ */

+void i2cMasterReceiveI(I2CDriver *i2cp, size_t n, uint8_t *rxbuf,

+                       i2ccallback_t callback) {

+

+  chDbgCheck((i2cp != NULL) && (n > 0) &&

+             (rxbuf != NULL) && (callback != NULL), "i2cMasterReceiveI");

+  chDbgAssert(i2cp->i2c_state == I2C_MREADY,

+              "i2cMasterReceiveI(), #1", "invalid state");

+

+  i2cp->id_callback = callback;

+  i2c_lld_master_receive(i2cp, n, rxbuf);

+}

+

+#if I2C_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)

+/**

+ * @brief   Gains exclusive access to the I2C bus.

+ * @details This function tries to gain ownership to the I2C bus, if the bus

+ *          is already being used then the invoking thread is queued.

+ * @note    This function is only available when the @p I2C_USE_MUTUAL_EXCLUSION

+ *          option is set to @p TRUE.

+ *

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

+ *

+ */

+void i2cAcquireBus(I2CDriver *i2cp) {

+

+  chDbgCheck(i2cp != NULL, "i2cAcquireBus");

+

+#if CH_USE_MUTEXES

+  chMtxLock(&i2cp->id_mutex);

+#elif CH_USE_SEMAPHORES

+  chSemWait(&i2cp->id_semaphore);

+#endif

+}

+

+/**

+ * @brief   Releases exclusive access to the I2C bus.

+ * @note    This function is only available when the @p I2C_USE_MUTUAL_EXCLUSION

+ *          option is set to @p TRUE.

+ *

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

+ */

+void i2cReleaseBus(I2CDriver *i2cp) {

+

+  chDbgCheck(i2cp != NULL, "i2cReleaseBus");

+

+#if CH_USE_MUTEXES

+  (void)i2cp;

+  chMtxUnlock();

+#elif CH_USE_SEMAPHORES

+  chSemSignal(&i2cp->id_semaphore);

+#endif

+}

+#endif /* I2C_USE_MUTUAL_EXCLUSION */

+

+#endif /* CH_HAL_USE_I2C */

+

+/** @} */