diff options
Diffstat (limited to 'os/hal/src')
| -rw-r--r-- | os/hal/src/ext.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/os/hal/src/ext.c b/os/hal/src/ext.c new file mode 100644 index 000000000..81c92525a --- /dev/null +++ b/os/hal/src/ext.c @@ -0,0 +1,204 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
+ 2011,2012,2013 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 ext.c
+ * @brief EXT Driver code.
+ *
+ * @addtogroup EXT
+ * @{
+ */
+
+#include "hal.h"
+
+#if HAL_USE_EXT || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver local definitions. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported variables. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local variables and types. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local functions. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported functions. */
+/*===========================================================================*/
+
+/**
+ * @brief EXT Driver initialization.
+ * @note This function is implicitly invoked by @p halInit(), there is
+ * no need to explicitly initialize the driver.
+ *
+ * @init
+ */
+void extInit(void) {
+
+ ext_lld_init();
+}
+
+/**
+ * @brief Initializes the standard part of a @p EXTDriver structure.
+ *
+ * @param[out] extp pointer to the @p EXTDriver object
+ *
+ * @init
+ */
+void extObjectInit(EXTDriver *extp) {
+
+ extp->state = EXT_STOP;
+ extp->config = NULL;
+}
+
+/**
+ * @brief Configures and activates the EXT peripheral.
+ * @post After activation all EXT channels are in the disabled state,
+ * use @p extChannelEnable() in order to activate them.
+ *
+ * @param[in] extp pointer to the @p EXTDriver object
+ * @param[in] config pointer to the @p EXTConfig object
+ *
+ * @api
+ */
+void extStart(EXTDriver *extp, const EXTConfig *config) {
+
+ osalDbgCheck((extp != NULL) && (config != NULL));
+
+ osalSysLock();
+ osalDbgAssert((extp->state == EXT_STOP) || (extp->state == EXT_ACTIVE),
+ "invalid state");
+ extp->config = config;
+ ext_lld_start(extp);
+ extp->state = EXT_ACTIVE;
+ osalSysUnlock();
+}
+
+/**
+ * @brief Deactivates the EXT peripheral.
+ *
+ * @param[in] extp pointer to the @p EXTDriver object
+ *
+ * @api
+ */
+void extStop(EXTDriver *extp) {
+
+ osalDbgCheck(extp != NULL);
+
+ osalSysLock();
+ osalDbgAssert((extp->state == EXT_STOP) || (extp->state == EXT_ACTIVE),
+ "invalid state");
+ ext_lld_stop(extp);
+ extp->state = EXT_STOP;
+ osalSysUnlock();
+}
+
+/**
+ * @brief Enables an EXT channel.
+ * @pre The channel must not be in @p EXT_CH_MODE_DISABLED mode.
+ *
+ * @param[in] extp pointer to the @p EXTDriver object
+ * @param[in] channel channel to be enabled
+ *
+ * @api
+ */
+void extChannelEnable(EXTDriver *extp, expchannel_t channel) {
+
+ osalDbgCheck((extp != NULL) && (channel < EXT_MAX_CHANNELS));
+
+ osalSysLock();
+ osalDbgAssert((extp->state == EXT_ACTIVE) &&
+ ((extp->config->channels[channel].mode &
+ EXT_CH_MODE_EDGES_MASK) != EXT_CH_MODE_DISABLED),
+ "invalid state");
+ extChannelEnableI(extp, channel);
+ osalSysUnlock();
+}
+
+/**
+ * @brief Disables an EXT channel.
+ * @pre The channel must not be in @p EXT_CH_MODE_DISABLED mode.
+ *
+ * @param[in] extp pointer to the @p EXTDriver object
+ * @param[in] channel channel to be disabled
+ *
+ * @api
+ */
+void extChannelDisable(EXTDriver *extp, expchannel_t channel) {
+
+ osalDbgCheck((extp != NULL) && (channel < EXT_MAX_CHANNELS));
+
+ osalSysLock();
+ osalDbgAssert((extp->state == EXT_ACTIVE) &&
+ ((extp->config->channels[channel].mode &
+ EXT_CH_MODE_EDGES_MASK) != EXT_CH_MODE_DISABLED),
+ "invalid state");
+ extChannelDisableI(extp, channel);
+ osalSysUnlock();
+}
+
+/**
+ * @brief Changes the operation mode of a channel.
+ * @note This function attempts to write over the current configuration
+ * structure that must have been not declared constant. This
+ * violates the @p const qualifier in @p extStart() but it is
+ * intentional.
+ * @note This function cannot be used if the configuration structure is
+ * declared @p const.
+ * @note The effect of this function on constant configuration structures
+ * is not defined.
+ *
+ * @param[in] extp pointer to the @p EXTDriver object
+ * @param[in] channel channel to be changed
+ * @param[in] extcp new configuration for the channel
+ *
+ * @iclass
+ */
+void extSetChannelModeI(EXTDriver *extp,
+ expchannel_t channel,
+ const EXTChannelConfig *extcp) {
+ EXTChannelConfig *oldcp;
+
+ osalDbgCheck((extp != NULL) &&
+ (channel < EXT_MAX_CHANNELS) &&
+ (extcp != NULL));
+
+ osalDbgAssert(extp->state == EXT_ACTIVE, "invalid state");
+
+ /* Note that here the access is enforced as non-const, known access
+ violation.*/
+ oldcp = (EXTChannelConfig *)&extp->config->channels[channel];
+
+ /* Overwiting the old channels configuration then the channel is reconfigured
+ by the low level driver.*/
+ *oldcp = *extcp;
+ ext_lld_channel_enable(extp, channel);
+}
+
+#endif /* HAL_USE_EXT */
+
+/** @} */
|