Diff: mbed-dev/targets/TARGET_NORDIC/TARGET_NRF5/gpio_api.c

Revision:

18:6a4db94011d3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-dev/targets/TARGET_NORDIC/TARGET_NRF5/gpio_api.c	Sun May 14 23:18:57 2017 +0000
@@ -0,0 +1,249 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * 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 "mbed_assert.h"
+#include "gpio_api.h"
+#include "gpio_irq_api.h"
+#include "pinmap.h"
+#include "nrf_drv_gpiote.h"
+
+
+#if defined(TARGET_MCU_NRF51822)
+    #define GPIO_PIN_COUNT 31
+#else
+    #define GPIO_PIN_COUNT 32
+#endif
+
+typedef struct {
+    bool         used_as_gpio : 1;
+    PinDirection direction    : 1;
+    bool         init_high    : 1;
+    PinMode      pull         : 2;
+    bool         used_as_irq  : 1;
+    bool         irq_fall     : 1;
+    bool         irq_rise     : 1;
+} gpio_cfg_t;
+
+uint32_t m_gpio_initialized;
+gpio_cfg_t m_gpio_cfg[GPIO_PIN_COUNT];
+
+
+/***********
+  GPIO IRQ
+***********/
+
+static gpio_irq_handler m_irq_handler;
+static uint32_t m_channel_ids[GPIO_PIN_COUNT] = {0};
+uint32_t m_gpio_irq_enabled;
+
+
+static void gpiote_irq_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
+{
+    nrf_gpio_pin_sense_t sense =  nrf_gpio_pin_sense_get(pin);
+    gpio_irq_event event = (sense == NRF_GPIO_PIN_SENSE_LOW) ? IRQ_RISE : IRQ_FALL;
+    
+    if (m_gpio_irq_enabled & (1UL << pin)) {
+        if (((event == IRQ_RISE) && m_gpio_cfg[pin].irq_rise)
+            || ((event == IRQ_FALL) && m_gpio_cfg[pin].irq_fall)) {
+                m_irq_handler(m_channel_ids[pin], event);
+            }
+    }
+}
+
+void GPIOTE_IRQHandler(void);// exported from nrf_drv_gpiote.c
+
+void gpio_init(gpio_t *obj, PinName pin)
+{
+    obj->pin = pin;
+    if (pin == (PinName)NC) {
+        return;
+    }
+    MBED_ASSERT((uint32_t)pin < GPIO_PIN_COUNT);
+    
+    NVIC_SetVector(GPIOTE_IRQn, (uint32_t) GPIOTE_IRQHandler);
+    
+    (void) nrf_drv_gpiote_init();
+
+    m_gpio_cfg[obj->pin].used_as_gpio = true;
+}
+
+
+int gpio_read(gpio_t *obj)
+{
+    MBED_ASSERT(obj->pin != (PinName)NC);
+    if (m_gpio_cfg[obj->pin].direction == PIN_OUTPUT) {
+        return ((NRF_GPIO->OUTSET & (1UL << obj->pin)) ? 1 : 0);
+    } else {
+        return nrf_gpio_pin_read(obj->pin);
+    }
+}
+
+static void gpiote_pin_uninit(uint8_t pin)
+{
+    if (m_gpio_initialized & (1UL << pin)) {
+        if ((m_gpio_cfg[pin].direction == PIN_OUTPUT) && (!m_gpio_cfg[pin].used_as_irq)) {
+            nrf_drv_gpiote_out_uninit(pin);
+        }
+        else {
+            nrf_drv_gpiote_in_uninit(pin);
+        }
+    }
+}
+
+static void gpio_apply_config(uint8_t pin)
+{
+    if (m_gpio_cfg[pin].used_as_gpio || m_gpio_cfg[pin].used_as_irq) {
+        if ((m_gpio_cfg[pin].direction == PIN_INPUT)
+            || (m_gpio_cfg[pin].used_as_irq)) {
+            //Configure as input.
+            nrf_drv_gpiote_in_config_t cfg;
+
+            cfg.hi_accuracy = false;
+            cfg.is_watcher = false;
+            cfg.sense = NRF_GPIOTE_POLARITY_TOGGLE;
+            if (m_gpio_cfg[pin].used_as_irq) {
+                cfg.pull = NRF_GPIO_PIN_PULLUP;
+                nrf_drv_gpiote_in_init(pin, &cfg, gpiote_irq_handler);
+                if ((m_gpio_irq_enabled & (1 << pin))
+                    && (m_gpio_cfg[pin].irq_rise || m_gpio_cfg[pin].irq_fall))
+                {
+                    nrf_drv_gpiote_in_event_enable(pin, true);
+                }
+            }
+            else {
+                switch(m_gpio_cfg[pin].pull) {
+                    case PullUp:
+                        cfg.pull = NRF_GPIO_PIN_PULLUP;
+                    break;
+                    case PullDown:
+                        cfg.pull = NRF_GPIO_PIN_PULLDOWN;
+                    break;
+                    default:
+                        cfg.pull = NRF_GPIO_PIN_NOPULL;
+                    break;
+                }
+                nrf_drv_gpiote_in_init(pin, &cfg, NULL);
+            }
+        }
+        else {
+            // Configure as output.
+            nrf_drv_gpiote_out_config_t cfg = GPIOTE_CONFIG_OUT_SIMPLE(m_gpio_cfg[pin].init_high);
+            nrf_drv_gpiote_out_init(pin, &cfg);
+        }
+        m_gpio_initialized |= (1UL << pin);
+    }
+    else {
+        m_gpio_initialized &= ~(1UL << pin);
+    }
+}
+
+
+void gpio_mode(gpio_t *obj, PinMode mode)
+{
+    MBED_ASSERT(obj->pin <= GPIO_PIN_COUNT);
+    
+    gpiote_pin_uninit(obj->pin); // try to uninitialize gpio before a change.
+    
+    m_gpio_cfg[obj->pin].pull = mode;
+    gpio_apply_config(obj->pin);
+}
+
+
+void gpio_dir(gpio_t *obj, PinDirection direction)
+{
+    MBED_ASSERT(obj->pin <= GPIO_PIN_COUNT);
+    
+    gpiote_pin_uninit(obj->pin); // try to uninitialize gpio before a change.
+    
+    m_gpio_cfg[obj->pin].direction = direction;
+    gpio_apply_config(obj->pin);
+}
+
+
+/***********
+  GPIO IRQ
+***********/
+
+int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32_t id)
+{
+    if (pin == NC) {
+        return -1;
+    }
+    MBED_ASSERT((uint32_t)pin < GPIO_PIN_COUNT);
+    (void) nrf_drv_gpiote_init();
+
+    gpiote_pin_uninit(pin); // try to uninitialize gpio before a change.
+    
+    m_gpio_cfg[pin].used_as_irq = true;
+    m_channel_ids[pin] = id;
+    obj->ch            = pin;
+    m_irq_handler      = handler;
+    m_channel_ids[pin] = id;
+
+    gpio_apply_config(pin);
+    return 1;
+}
+
+
+void gpio_irq_free(gpio_irq_t *obj)
+{
+    nrf_drv_gpiote_in_uninit(obj->ch);
+    m_gpio_cfg[obj->ch].used_as_irq = false;
+    m_channel_ids[obj->ch] = 0;
+
+    gpio_apply_config(obj->ch);
+}
+
+
+void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable)
+{
+    gpio_cfg_t* cfg = &m_gpio_cfg[obj->ch];
+    bool irq_enabled_before =
+        (m_gpio_irq_enabled & (1 << obj->ch)) &&
+        (cfg->irq_rise || cfg->irq_fall);
+
+    if (event == IRQ_RISE) {
+        cfg->irq_rise = enable ? true : false;
+    }
+    else if (event == IRQ_FALL) {
+        cfg->irq_fall = enable ? true : false;
+    }
+
+    bool irq_enabled_after = cfg->irq_rise || cfg->irq_fall;
+
+    if (irq_enabled_before != irq_enabled_after) {
+        if (irq_enabled_after) {
+            gpio_irq_enable(obj);
+        } else {
+            gpio_irq_disable(obj);
+        }
+    }
+}
+
+
+void gpio_irq_enable(gpio_irq_t *obj)
+{
+    m_gpio_irq_enabled |= (1 << obj->ch);
+    if (m_gpio_cfg[obj->ch].irq_rise || m_gpio_cfg[obj->ch].irq_fall) {
+        nrf_drv_gpiote_in_event_enable(obj->ch, true);
+    }
+}
+
+
+void gpio_irq_disable(gpio_irq_t *obj)
+{
+    m_gpio_irq_enabled &= ~(1 << obj->ch);
+    nrf_drv_gpiote_in_event_disable(obj->ch);
+}