diff options
Diffstat (limited to 'os/hal/platforms/LPC8xx/ext_lld.c')
| -rw-r--r-- | os/hal/platforms/LPC8xx/ext_lld.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/os/hal/platforms/LPC8xx/ext_lld.c b/os/hal/platforms/LPC8xx/ext_lld.c new file mode 100644 index 000000000..81e09c717 --- /dev/null +++ b/os/hal/platforms/LPC8xx/ext_lld.c @@ -0,0 +1,168 @@ +/*
+ 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 LPC8xx/ext_lld.c
+ * @brief LPC8xx 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) {
+ int i;
+
+ LPC_SYSCON->SYSAHBCLKCTRL |= (1<<6);
+ /* 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) {
+ int i;
+
+ if (extp->state == EXT_ACTIVE)
+ for (i = 0; i < EXT_MAX_CHANNELS; i++)
+ ext_lld_exti_irq_disable(i);
+
+ LPC_PIN_INT->ISEL = 0;
+ LPC_PIN_INT->CIENR = EXT_CHANNELS_MASK;
+ LPC_PIN_INT->RISE = EXT_CHANNELS_MASK;
+ LPC_PIN_INT->FALL = EXT_CHANNELS_MASK;
+ LPC_PIN_INT->IST = EXT_CHANNELS_MASK;
+
+ /* Leave clock enabled, its shared with GPIO */
+ /*LPC_SYSCON->SYSAHBCLKCTRL &= ~(1<<6);*/
+}
+
+/**
+ * @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) {
+
+ /* program the IOpin for this channel */
+ LPC_SYSCON->PINTSEL[channel] = extp->config->channels[channel].iopin;
+
+ /* Programming edge irq enables */
+ if (extp->config->channels[channel].mode & EXT_CH_MODE_RISING_EDGE)
+ LPC_PIN_INT->SIENR = (1 << channel);
+ else
+ LPC_PIN_INT->CIENR = (1 << channel);
+
+ if (extp->config->channels[channel].mode & EXT_CH_MODE_FALLING_EDGE)
+ LPC_PIN_INT->SIENF = (1 << channel);
+ else
+ LPC_PIN_INT->CIENF = (1 << channel);
+
+ LPC_PIN_INT->RISE = (1<<channel);
+ LPC_PIN_INT->FALL = (1<<channel);
+ LPC_PIN_INT->IST = (1<<channel);
+
+ ext_lld_exti_irq_enable( channel );
+}
+
+/**
+ * @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;
+
+ ext_lld_exti_irq_disable(channel);
+
+ LPC_PIN_INT->ISEL &= ~(1 << channel);
+ LPC_PIN_INT->CIENR = (1 << channel);
+ LPC_PIN_INT->RISE = (1 << channel);
+ LPC_PIN_INT->FALL = (1 << channel);
+ LPC_PIN_INT->IST = (1 << channel);
+}
+
+#endif /* HAL_USE_EXT */
+
+/** @} */
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