Lee Kai Xuan
mbed-os
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erkin yucel
Diff: targets/TARGET_NORDIC/TARGET_NRF5/gpio_api.c
- Revision:
- 0:f269e3021894
diff -r 000000000000 -r f269e3021894 targets/TARGET_NORDIC/TARGET_NRF5/gpio_api.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_NORDIC/TARGET_NRF5/gpio_api.c Sun Oct 23 15:10:02 2016 +0000
@@ -0,0 +1,235 @@
+/* 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 gpio_init(gpio_t *obj, PinName pin)
+{
+ obj->pin = pin;
+ if (pin == (PinName)NC) {
+ return;
+ }
+ MBED_ASSERT((uint32_t)pin < GPIO_PIN_COUNT);
+ (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 gpio_apply_config(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);
+ }
+ }
+
+ 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);
+ 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);
+ 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();
+
+ 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);
+}