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| author | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2013-08-09 08:25:09 +0000 |
|---|---|---|
| committer | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2013-08-09 08:25:09 +0000 |
| commit | 0e34cd051ed686263001af3a721f6858db94d072 (patch) | |
| tree | 499c397f624dff297b4a5cf11e783f30cc6ae4b3 /os/hal/platforms/STM32/ext_lld.c | |
| parent | 8ca210a4af9fd039e290cfcc309adde543999c1f (diff) | |
| download | ChibiOS-0e34cd051ed686263001af3a721f6858db94d072.tar.gz ChibiOS-0e34cd051ed686263001af3a721f6858db94d072.tar.bz2 ChibiOS-0e34cd051ed686263001af3a721f6858db94d072.zip | |
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/kernel_3_dev@6109 35acf78f-673a-0410-8e92-d51de3d6d3f4
Diffstat (limited to 'os/hal/platforms/STM32/ext_lld.c')
| -rw-r--r-- | os/hal/platforms/STM32/ext_lld.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/os/hal/platforms/STM32/ext_lld.c b/os/hal/platforms/STM32/ext_lld.c new file mode 100644 index 000000000..970e0ce8e --- /dev/null +++ b/os/hal/platforms/STM32/ext_lld.c @@ -0,0 +1,221 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+/**
+ * @file STM32/ext_lld.c
+ * @brief STM32 EXT subsystem low level driver source.
+ *
+ * @addtogroup EXT
+ * @{
+ */
+
+#include "ch.h"
+#include "hal.h"
+
+#if HAL_USE_EXT || defined(__DOXYGEN__)
+
+#include "ext_lld_isr.h"
+
+/*===========================================================================*/
+/* Driver local definitions. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported variables. */
+/*===========================================================================*/
+
+/**
+ * @brief EXTD1 driver identifier.
+ */
+EXTDriver EXTD1;
+
+/*===========================================================================*/
+/* Driver local variables and types. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local functions. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver interrupt handlers. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported functions. */
+/*===========================================================================*/
+
+/**
+ * @brief Low level EXT driver initialization.
+ *
+ * @notapi
+ */
+void ext_lld_init(void) {
+
+ /* Driver initialization.*/
+ extObjectInit(&EXTD1);
+}
+
+/**
+ * @brief Configures and activates the EXT peripheral.
+ *
+ * @param[in] extp pointer to the @p EXTDriver object
+ *
+ * @notapi
+ */
+void ext_lld_start(EXTDriver *extp) {
+ unsigned i;
+
+ if (extp->state == EXT_STOP)
+ ext_lld_exti_irq_enable();
+
+ /* Configuration of automatic channels.*/
+ for (i = 0; i < EXT_MAX_CHANNELS; i++)
+ if (extp->config->channels[i].mode & EXT_CH_MODE_AUTOSTART)
+ ext_lld_channel_enable(extp, i);
+ else
+ ext_lld_channel_disable(extp, i);
+}
+
+/**
+ * @brief Deactivates the EXT peripheral.
+ *
+ * @param[in] extp pointer to the @p EXTDriver object
+ *
+ * @notapi
+ */
+void ext_lld_stop(EXTDriver *extp) {
+
+ if (extp->state == EXT_ACTIVE)
+ ext_lld_exti_irq_disable();
+
+ EXTI->EMR = 0;
+ EXTI->IMR = 0;
+ EXTI->PR = 0xFFFFFFFF;
+#if STM32_EXTI_NUM_CHANNELS > 32
+ EXTI->PR2 = 0xFFFFFFFF;
+#endif
+}
+
+/**
+ * @brief Enables an EXT channel.
+ *
+ * @param[in] extp pointer to the @p EXTDriver object
+ * @param[in] channel channel to be enabled
+ *
+ * @notapi
+ */
+void ext_lld_channel_enable(EXTDriver *extp, expchannel_t channel) {
+
+#if STM32_EXTI_NUM_CHANNELS > 32
+ if (channel < 32) {
+#endif
+ /* Programming edge registers.*/
+ if (extp->config->channels[channel].mode & EXT_CH_MODE_RISING_EDGE)
+ EXTI->RTSR |= (1 << channel);
+ else
+ EXTI->RTSR &= ~(1 << channel);
+ if (extp->config->channels[channel].mode & EXT_CH_MODE_FALLING_EDGE)
+ EXTI->FTSR |= (1 << channel);
+ else
+ EXTI->FTSR &= ~(1 << channel);
+
+ /* Programming interrupt and event registers.*/
+ if (extp->config->channels[channel].cb != NULL) {
+ EXTI->IMR |= (1 << channel);
+ EXTI->EMR &= ~(1 << channel);
+ }
+ else {
+ EXTI->EMR |= (1 << channel);
+ EXTI->IMR &= ~(1 << channel);
+ }
+#if STM32_EXTI_NUM_CHANNELS > 32
+ }
+ else {
+ /* Programming edge registers.*/
+ if (extp->config->channels[channel].mode & EXT_CH_MODE_RISING_EDGE)
+ EXTI->RTSR2 |= (1 << (32 - channel));
+ else
+ EXTI->RTSR2 &= ~(1 << (32 - channel));
+ if (extp->config->channels[channel].mode & EXT_CH_MODE_FALLING_EDGE)
+ EXTI->FTSR2 |= (1 << (32 - channel));
+ else
+ EXTI->FTSR2 &= ~(1 << (32 - channel));
+
+ /* Programming interrupt and event registers.*/
+ if (extp->config->channels[channel].cb != NULL) {
+ EXTI->IMR2 |= (1 << (32 - channel));
+ EXTI->EMR2 &= ~(1 << (32 - channel));
+ }
+ else {
+ EXTI->EMR2 |= (1 << (32 - channel));
+ EXTI->IMR2 &= ~(1 << (32 - channel));
+ }
+ }
+#endif
+
+ /* Setting the associated GPIO for external channels.*/
+ if (channel < 16) {
+ uint32_t n = channel >> 2;
+ uint32_t mask = ~(0xF << ((channel & 3) * 4));
+ uint32_t port = ((extp->config->channels[channel].mode &
+ EXT_MODE_GPIO_MASK) >>
+ EXT_MODE_GPIO_OFF) << ((channel & 3) * 4);
+
+#if defined(STM32L1XX_MD) || defined(STM32F0XX) || defined(STM32F2XX) || \
+ defined(STM32F30X) || defined(STM32F37X) || defined(STM32F4XX)
+ SYSCFG->EXTICR[n] = (SYSCFG->EXTICR[n] & mask) | port;
+#else /* STM32F1XX */
+ AFIO->EXTICR[n] = (AFIO->EXTICR[n] & mask) | port;
+#endif /* STM32F1XX */
+ }
+}
+
+/**
+ * @brief Disables an EXT channel.
+ *
+ * @param[in] extp pointer to the @p EXTDriver object
+ * @param[in] channel channel to be disabled
+ *
+ * @notapi
+ */
+void ext_lld_channel_disable(EXTDriver *extp, expchannel_t channel) {
+
+ (void)extp;
+
+#if STM32_EXTI_NUM_CHANNELS > 32
+ if (channel < 32) {
+#endif
+ EXTI->IMR &= ~(1 << channel);
+ EXTI->EMR &= ~(1 << channel);
+ EXTI->RTSR &= ~(1 << channel);
+ EXTI->FTSR &= ~(1 << channel);
+ EXTI->PR = (1 << channel);
+#if STM32_EXTI_NUM_CHANNELS > 32
+ }
+ else {
+ EXTI->IMR2 &= ~(1 << (32 - channel));
+ EXTI->EMR2 &= ~(1 << (32 - channel));
+ EXTI->RTSR2 &= ~(1 << (32 - channel));
+ EXTI->FTSR2 &= ~(1 << (32 - channel));
+ EXTI->PR2 = (1 << (32 - channel));
+ }
+#endif
+}
+
+#endif /* HAL_USE_EXT */
+
+/** @} */
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