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/*
* Copyright (c) 2016 ARM Ltd.
*
* 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 <device.h>
#include <sensor.h>
#include <clock_control.h>
#define SYS_LOG_DOMAIN "TEMPNRF5"
#define SYS_LOG_LEVEL CONFIG_SYS_LOG_SENSOR_LEVEL
#include <logging/sys_log.h>
#include "nrf.h"
#include "nrf5_common.h"
/* The nRF5 temperature device returns measurements in 0.25C
* increments. Scale to mDegrees C.
*/
#define TEMP_NRF5_TEMP_SCALE (1000000 / 4)
struct temp_nrf5_data {
struct k_sem device_sync_sem;
int32_t sample;
struct device *clk_m16_dev;
};
static int temp_nrf5_sample_fetch(struct device *dev, enum sensor_channel chan)
{
volatile NRF_TEMP_Type *temp = NRF_TEMP;
struct temp_nrf5_data *data = dev->driver_data;
int r;
SYS_LOG_DBG("");
if (chan != SENSOR_CHAN_ALL && chan != SENSOR_CHAN_TEMP) {
return -ENOTSUP;
}
/* The clock driver for nrf51 currently overloads the
* subsystem parameter with a flag to indicate whether or not
* it should block.
*/
r = clock_control_on(data->clk_m16_dev, (void *)1);
__ASSERT_NO_MSG(!r);
temp->TASKS_START = 1;
k_sem_take(&data->device_sync_sem, K_FOREVER);
r = clock_control_off(data->clk_m16_dev, (void *)1);
__ASSERT_NO_MSG(!r);
data->sample = temp->TEMP;
temp->TASKS_STOP = 1;
return 0;
}
static int temp_nrf5_channel_get(struct device *dev,
enum sensor_channel chan,
struct sensor_value *val)
{
struct temp_nrf5_data *data = dev->driver_data;
int32_t uval;
SYS_LOG_DBG("");
if (chan != SENSOR_CHAN_TEMP) {
return -ENOTSUP;
}
uval = data->sample * TEMP_NRF5_TEMP_SCALE;
val->type = SENSOR_VALUE_TYPE_INT_PLUS_MICRO;
val->val1 = uval / 1000000;
val->val2 = uval % 1000000;
return 0;
}
static void temp_nrf5_isr(void *arg)
{
volatile NRF_TEMP_Type *temp = NRF_TEMP;
struct device *dev = (struct device *)arg;
struct temp_nrf5_data *data = dev->driver_data;
temp->EVENTS_DATARDY = 0;
k_sem_give(&data->device_sync_sem);
}
static const struct sensor_driver_api temp_nrf5_driver_api = {
.sample_fetch = temp_nrf5_sample_fetch,
.channel_get = temp_nrf5_channel_get,
};
static int temp_nrf5_init(struct device *dev);
static struct temp_nrf5_data temp_nrf5_driver;
DEVICE_AND_API_INIT(temp_nrf5, CONFIG_TEMP_NRF5_NAME, temp_nrf5_init,
&temp_nrf5_driver, NULL,
POST_KERNEL,
CONFIG_SENSOR_INIT_PRIORITY, &temp_nrf5_driver_api);
static int temp_nrf5_init(struct device *dev)
{
volatile NRF_TEMP_Type *temp = NRF_TEMP;
struct temp_nrf5_data *data = dev->driver_data;
SYS_LOG_DBG("");
data->clk_m16_dev =
device_get_binding(CONFIG_CLOCK_CONTROL_NRF5_M16SRC_DRV_NAME);
__ASSERT_NO_MSG(data->clk_m16_dev);
k_sem_init(&data->device_sync_sem, 0, UINT_MAX);
IRQ_CONNECT(NRF5_IRQ_TEMP_IRQn, CONFIG_TEMP_NRF5_PRI,
temp_nrf5_isr, DEVICE_GET(temp_nrf5), 0);
irq_enable(NRF5_IRQ_TEMP_IRQn);
temp->INTENSET = TEMP_INTENSET_DATARDY_Set;
return 0;
}
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