diff options
Diffstat (limited to 'os/hal/platforms/LPC11xx/ext_lld.c')
| -rw-r--r-- | os/hal/platforms/LPC11xx/ext_lld.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/os/hal/platforms/LPC11xx/ext_lld.c b/os/hal/platforms/LPC11xx/ext_lld.c new file mode 100644 index 000000000..c22cd83be --- /dev/null +++ b/os/hal/platforms/LPC11xx/ext_lld.c @@ -0,0 +1,259 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
+ LPC11xx EXT driver - Copyright (C) 2013 Marcin Jokel
+
+ 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 LPC11xx/ext_lld.c
+ * @brief LPC11xx 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 EXTD0 driver identifier.
+ */
+#if LPC11xx_EXT_USE_EXT0 || defined(__DOXYGEN__)
+EXTDriver EXTD0;
+#endif
+
+/**
+ * @brief EXTD1 driver identifier.
+ */
+#if LPC11xx_EXT_USE_EXT1 || defined(__DOXYGEN__)
+EXTDriver EXTD1;
+#endif
+
+/**
+ * @brief EXTD2 driver identifier.
+ */
+#if LPC11xx_EXT_USE_EXT2 || defined(__DOXYGEN__)
+EXTDriver EXTD2;
+#endif
+
+/**
+ * @brief EXTD3 driver identifier.
+ */
+#if LPC11xx_EXT_USE_EXT3 || defined(__DOXYGEN__)
+EXTDriver EXTD3;
+#endif
+
+/*===========================================================================*/
+/* 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.*/
+#if LPC11xx_EXT_USE_EXT0
+ extObjectInit(&EXTD0);
+ EXTD0.gpio = LPC_GPIO0;
+#endif
+
+#if LPC11xx_EXT_USE_EXT1
+ extObjectInit(&EXTD1);
+ EXTD1.gpio = LPC_GPIO1;
+#endif
+
+#if LPC11xx_EXT_USE_EXT2
+ extObjectInit(&EXTD2);
+ EXTD2.gpio = LPC_GPIO2;
+#endif
+
+#if LPC11xx_EXT_USE_EXT3
+ extObjectInit(&EXTD3);
+ EXTD3.gpio = LPC_GPIO3;
+#endif
+}
+
+/**
+ * @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;
+
+ /* Configure all pins as edge sensitive */
+#if LPC11xx_EXT_USE_EXT0
+ if (extp == &EXTD0) {
+ LPC_GPIO0->IS = 0;
+ ext_lld_exti_irq_enable(EXTI0_IRQ);
+ }
+#endif
+
+#if LPC11xx_EXT_USE_EXT1
+ if (extp == &EXTD1) {
+ LPC_GPIO1->IS = 0;
+ ext_lld_exti_irq_enable(EXTI1_IRQ);
+ }
+#endif
+
+#if LPC11xx_EXT_USE_EXT2
+ if (extp == &EXTD2) {
+ LPC_GPIO2->IS = 0;
+ ext_lld_exti_irq_enable(EXTI2_IRQ);
+ }
+#endif
+
+#if LPC11xx_EXT_USE_EXT3
+ if (extp == &EXTD3) {
+ LPC_GPIO3->IS = 0;
+ ext_lld_exti_irq_enable(EXTI3_IRQ);
+ }
+#endif
+
+ /* Configuration of autostart 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) {
+
+ LPC_GPIO_TypeDef * gp = extp->gpio;
+
+ if (extp->state == EXT_ACTIVE) {
+#if LPC11xx_EXT_USE_EXT0
+ if (extp == &EXTD0) {
+ ext_lld_exti_irq_disable(EXTI0_IRQ);
+ }
+#endif
+
+#if LPC11xx_EXT_USE_EXT1
+ if (extp == &EXTD1) {
+ ext_lld_exti_irq_disable(EXTI1_IRQ);
+ }
+#endif
+
+#if LPC11xx_EXT_USE_EXT2
+ if (extp == &EXTD2) {
+ ext_lld_exti_irq_disable(EXTI2_IRQ);
+ }
+#endif
+
+#if LPC11xx_EXT_USE_EXT3
+ if (extp == &EXTD3) {
+ ext_lld_exti_irq_disable(EXTI3_IRQ);
+ }
+#endif
+ }
+
+ gp->IE = 0;
+ gp->IC = 0xFFFFFFFF;
+ __NOP();
+ __NOP();
+}
+
+/**
+ * @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) {
+
+ LPC_GPIO_TypeDef * gp;
+
+ gp = extp->gpio;
+
+ /* Programming edge irq enables */
+ if (extp->config->channels[channel].mode & EXT_CH_MODE_BOTH_EDGES)
+ gp->IBE |= (1 << channel);
+ else {
+ gp->IBE &= ~(1 << channel);
+ if (extp->config->channels[channel].mode & EXT_CH_MODE_RISING_EDGE)
+ gp->IEV |= (1 << channel);
+ else
+ gp->IEV &= (1 << channel);
+ }
+
+ gp->IC = (1 << channel); /* Clear interrupt on selected channel */
+ __NOP();
+ __NOP();
+
+ gp->IE |= (1 << channel); /* Interrupt on selected channel
+ is not masked */
+}
+
+/**
+ * @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) {
+
+ LPC_GPIO_TypeDef * gp;
+
+ gp = extp->gpio;
+
+ gp->IE &= ~(1 << channel); /* Mask interrupt on selected channel */
+ gp->IC = (1 << channel); /* Clear interrupt on selected channel */
+ __NOP();
+ __NOP();
+}
+
+#endif /* HAL_USE_EXT */
+
+/** @} */
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