Diff: targets/TARGET_NORDIC/TARGET_MCU_NRF51822/gpio_irq_api.c

Revision:

149:156823d33999

Parent:

144:ef7eb2e8f9f7

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_NORDIC/TARGET_MCU_NRF51822/gpio_irq_api.c	Fri Oct 28 11:17:30 2016 +0100
@@ -0,0 +1,127 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2013 Nordic Semiconductor
+ *
+ * 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.
+ */
+#include <stddef.h>
+#include "cmsis.h"
+
+#include "gpio_irq_api.h"
+#include "mbed_error.h"
+
+#define CHANNEL_NUM    31
+
+static uint32_t channel_ids[CHANNEL_NUM] = {0}; //each pin will be given an id, if id is 0 the pin can be ignored.
+static uint8_t channel_enabled[CHANNEL_NUM] = {0};
+static uint32_t portRISE = 0;
+static uint32_t portFALL = 0;
+static gpio_irq_handler irq_handler;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+void GPIOTE_IRQHandler(void)
+{
+    volatile uint32_t newVal = NRF_GPIO->IN;
+
+    if ((NRF_GPIOTE->EVENTS_PORT != 0) && ((NRF_GPIOTE->INTENSET & GPIOTE_INTENSET_PORT_Msk) != 0)) {
+        NRF_GPIOTE->EVENTS_PORT = 0;
+
+        for (uint8_t i = 0; i<31; i++) {
+            if (channel_ids[i]>0) {
+                if (channel_enabled[i]) {
+                    if( ((newVal>>i)&1)  && ( ( (NRF_GPIO->PIN_CNF[i] >>GPIO_PIN_CNF_SENSE_Pos) & GPIO_PIN_CNF_SENSE_Low) != GPIO_PIN_CNF_SENSE_Low) && ( (portRISE>>i)&1) ){
+                        irq_handler(channel_ids[i], IRQ_RISE);
+                    } else if ((((newVal >> i) & 1) == 0) &&
+                               (((NRF_GPIO->PIN_CNF[i] >> GPIO_PIN_CNF_SENSE_Pos) & GPIO_PIN_CNF_SENSE_Low) == GPIO_PIN_CNF_SENSE_Low) &&
+                               ((portFALL >> i) & 1)) {
+                        irq_handler(channel_ids[i], IRQ_FALL);
+                    }
+                }
+
+                if (NRF_GPIO->PIN_CNF[i] & GPIO_PIN_CNF_SENSE_Msk) {
+                    NRF_GPIO->PIN_CNF[i] &= ~(GPIO_PIN_CNF_SENSE_Msk);
+
+                    if (newVal >> i & 1) {
+                        NRF_GPIO->PIN_CNF[i] |= (GPIO_PIN_CNF_SENSE_Low << GPIO_PIN_CNF_SENSE_Pos);
+                    } else {
+                        NRF_GPIO->PIN_CNF[i] |= (GPIO_PIN_CNF_SENSE_High << GPIO_PIN_CNF_SENSE_Pos);
+                    }
+                }
+            }
+        }
+    }
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32_t id)
+{
+    if (pin == NC) {
+        return -1;
+    }
+
+    irq_handler             = handler;
+    obj->ch                 = pin;
+    NRF_GPIOTE->EVENTS_PORT = 0;
+    channel_ids[pin]        = id;
+    channel_enabled[pin]    = 1;
+    NRF_GPIOTE->INTENSET    = GPIOTE_INTENSET_PORT_Set << GPIOTE_INTENSET_PORT_Pos;
+
+    NVIC_SetPriority(GPIOTE_IRQn, 3);
+    NVIC_EnableIRQ  (GPIOTE_IRQn);
+    return 0;
+}
+
+void gpio_irq_free(gpio_irq_t *obj)
+{
+    channel_ids[obj->ch] = 0;
+}
+
+void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable)
+{
+    NRF_GPIO->PIN_CNF[obj->ch] &= ~(GPIO_PIN_CNF_SENSE_Msk);
+    if (enable) {
+        if (event == IRQ_RISE) {
+            portRISE |= (1 << obj->ch);
+        } else if (event == IRQ_FALL) {
+            portFALL |= (1 << obj->ch);
+        }
+    } else {
+        if (event == IRQ_RISE) {
+            portRISE &= ~(1 << obj->ch);
+        } else if (event == IRQ_FALL) {
+            portFALL &= ~(1 << obj->ch);
+        }
+    }
+
+    if (((portRISE >> obj->ch) & 1) || ((portFALL >> obj->ch) & 1)) {
+        if ((NRF_GPIO->IN >> obj->ch) & 1) {
+            NRF_GPIO->PIN_CNF[obj->ch] |= (GPIO_PIN_CNF_SENSE_Low << GPIO_PIN_CNF_SENSE_Pos);    // | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos);
+        } else {
+            NRF_GPIO->PIN_CNF[obj->ch] |= (GPIO_PIN_CNF_SENSE_High << GPIO_PIN_CNF_SENSE_Pos);     //| (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos);
+        }
+    }
+}
+
+void gpio_irq_enable(gpio_irq_t *obj)
+{
+    channel_enabled[obj->ch] = 1;
+}
+
+void gpio_irq_disable(gpio_irq_t *obj)
+{
+    channel_enabled[obj->ch] = 0;
+}