I2C. After comparing of two drivers decided to start of importing features from Alberto driver to mine.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/i2c_dev@2712 35acf78f-673a-0410-8e92-d51de3d6d3f4

1 files changed, 215 insertions, 0 deletions

diff --git a/os/hal/src/i2c.c b/os/hal/src/i2c.c
new file mode 100644
index 000000000..5a0471e0f
--- /dev/null
+++ b/os/hal/src/i2c.c
@@ -0,0 +1,215 @@
+/*

+    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 HAL_USE_I2C || defined(__DOXYGEN__)

+

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

+/* Driver exported variables.                                                */

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

+

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

+/* Driver local variables.                                                   */

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

+

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

+/* Driver local functions.                                                   */

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

+

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

+/* Driver exported functions.                                                */

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

+

+/**

+ * @brief   I2C Driver initialization.

+ * @note    This function is implicitly invoked by @p halInit(), there is

+ *          no need to explicitly initialize the driver.

+ *

+ * @init

+ */

+void i2cInit(void) {

+  i2c_lld_init();

+}

+

+/**

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

+ *

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

+ *

+ * @init

+ */

+void i2cObjectInit(I2CDriver *i2cp) {

+

+  i2cp->id_state  = I2C_STOP;

+  i2cp->id_config = NULL;

+  i2cp->id_slave_config = NULL;

+#if defined(I2C_DRIVER_EXT_INIT_HOOK)

+  I2C_DRIVER_EXT_INIT_HOOK(i2cp);

+#endif

+}

+

+/**

+ * @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

+ *

+ * @api

+ */

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

+

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

+

+  chSysLock();

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

+              "i2cStart(), #1",

+              "invalid state");

+  i2cp->id_config = config;

+  i2c_lld_start(i2cp);

+  i2cp->id_state = I2C_READY;

+  chSysUnlock();

+}

+

+/**

+ * @brief   Deactivates the I2C peripheral.

+ *

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

+ *

+ * @api

+ */

+void i2cStop(I2CDriver *i2cp) {

+

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

+

+  chSysLock();

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

+              "i2cStop(), #1",

+              "invalid state");

+  i2c_lld_stop(i2cp);

+  i2cp->id_state = I2C_STOP;

+  chSysUnlock();

+}

+

+/**

+ * @brief Sends data ever the I2C bus.

+ *

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

+ * @param[in] slave_addr1    7-bit address of the slave

+ * @param[in] slave_addr1    used in 10-bit address mode

+ * @param[in] n              number of words to send

+ * @param[in] txbuf          the pointer to the transmit buffer

+ *

+ */

+void i2cMasterTransmit(I2CDriver *i2cp, I2CSlaveConfig *i2cscfg) {

+

+  chDbgCheck((i2cp != NULL) && (i2cscfg != NULL),

+             "i2cMasterTransmit");

+  chDbgAssert(i2cp->id_state == I2C_READY,

+              "i2cMasterTransmit(), #1",

+              "not active");

+

+  i2c_lld_master_transmitI(i2cp, i2cscfg);

+}

+

+

+/**

+ * @brief Receives data from the I2C bus.

+ *

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

+ * @param[in] slave_addr1    7-bit address of the slave

+ * @param[in] slave_addr1    used in 10-bit address mode

+ * @param[in] n         number of words to receive

+ * @param[out] rxbuf    the pointer to the receive buffer

+ *

+ */

+void i2cMasterReceive(I2CDriver *i2cp, I2CSlaveConfig *i2cscfg) {

+

+  chDbgCheck((i2cp != NULL) && (i2cscfg != NULL),

+             "i2cMasterReceive");

+  chDbgAssert(i2cp->id_state == I2C_READY,

+              "i2cMasterReceive(), #1",

+              "not active");

+

+  i2c_lld_master_receiveI(i2cp, i2cscfg);

+}

+

+

+

+

+

+

+#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.

+ * @pre     In order to use this function the option @p I2C_USE_MUTUAL_EXCLUSION

+ *          must be enabled.

+ *

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

+ *

+ * @api

+ *

+ */

+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.

+ * @pre     In order to use this function the option @p I2C_USE_MUTUAL_EXCLUSION

+ *          must be enabled.

+ *

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

+ *

+ * @api

+ */

+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 /* HAL_USE_I2C */

+

+/** @} */