add rtc device driver for nrf52x

Signed-off-by: chenyingchun0312 <[email protected]>

Author: chenyingchun0312

bsp/nrf5x/libraries/drivers/SConscript

@@ -32,6 +32,9 @@ if GetDepend(['BSP_USING_PWM']):
 if GetDepend(['BSP_USING_WDT']):
     src += ['drv_wdt.c']
 
+if GetDepend(['BSP_USING_ONCHIP_RTC']):
+    src += ['drv_rtc.c']
+
 path =  [cwd]
 
 group = DefineGroup('Drivers', src, depend = [''], CPPPATH = path)

bsp/nrf5x/libraries/drivers/drv_rtc.c

@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date         Author        Notes
+ * 2020-09-08   Chenyingchun  first version
+ */
+
+#include "board.h"
+#include <rtthread.h>
+#include <rtdevice.h>
+
+#include <nrfx_rtc.h>
+#include <nrfx_clock.h>
+
+#ifdef BSP_USING_ONCHIP_RTC
+
+#define LOG_TAG             "drv.rtc"
+#define DBG_LVL               DBG_LOG
+#include <rtdbg.h>
+
+/* 2018-01-30 14:44:50 = RTC_TIME_INIT(2018, 1, 30, 14, 44, 50)  */
+#define RTC_TIME_INIT(year, month, day, hour, minute, second)        \
+    {.tm_year = year - 1900, .tm_mon = month - 1, .tm_mday = day, .tm_hour = hour, .tm_min = minute, .tm_sec = second}
+
+#ifndef ONCHIP_RTC_TIME_DEFAULT
+#define ONCHIP_RTC_TIME_DEFAULT                    RTC_TIME_INIT(2018, 1, 1, 0, 0 ,0)
+#endif
+
+#define TICK_FREQUENCE_HZ        (RT_TICK_PER_SECOND)     // RTC tick frequence, in HZ
+
+static struct rt_device rtc;
+static time_t init_time;
+static uint32_t tick = 0;
+
+static void rtc_callback(nrfx_rtc_int_type_t int_type)
+{
+    static uint32_t count = 0;
+    
+    if (int_type == NRFX_RTC_INT_TICK)
+    {
+       count++;
+       if((count % TICK_FREQUENCE_HZ) == 0)
+       {
+            tick++;
+       }
+    }
+}
+
+static rt_err_t rt_rtc_config(struct rt_device *dev)
+{
+    #define SYSTICK_CLOCK_HZ    (32768UL)
+    #define RTC_PRESCALER       ((uint32_t) (NRFX_ROUNDED_DIV(SYSTICK_CLOCK_HZ, TICK_FREQUENCE_HZ) - 1))
+
+    const nrfx_rtc_t rtc_instance = NRFX_RTC_INSTANCE(2);
+    nrf_clock_lf_src_set(NRF_CLOCK, (nrf_clock_lfclk_t)NRFX_CLOCK_CONFIG_LF_SRC);
+    nrfx_clock_lfclk_start();
+
+    //Initialize RTC instance
+    nrfx_rtc_config_t config = NRFX_RTC_DEFAULT_CONFIG;
+    config.prescaler = RTC_PRESCALER;
+
+    nrfx_rtc_init(&rtc_instance, &config, rtc_callback);
+
+    nrfx_rtc_tick_enable(&rtc_instance, true);
+
+    //Power on RTC instance
+    nrfx_rtc_enable(&rtc_instance);
+
+    return RT_EOK;
+}
+
+static rt_err_t rt_rtc_control(rt_device_t dev, int cmd, void *args)
+{
+    time_t *time;
+    RT_ASSERT(dev != RT_NULL);
+
+    switch (cmd)
+    {
+        case RT_DEVICE_CTRL_RTC_GET_TIME:
+        {
+            time = (time_t *) args;
+            *time = init_time + tick;
+            break;
+        }
+        case RT_DEVICE_CTRL_RTC_SET_TIME:
+        {
+            time = (time_t *) args;
+            init_time = *time - tick;
+            break;
+        }
+    }
+    return RT_EOK;
+}
+
+
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops rtc_ops =
+{
+    RT_NULL,
+    RT_NULL,
+    RT_NULL,
+    RT_NULL,
+    RT_NULL,
+    rt_rtc_control
+};
+#endif
+
+static rt_err_t rt_hw_rtc_register(rt_device_t device, const char *name, rt_uint32_t flag)
+{
+    struct tm time_new = ONCHIP_RTC_TIME_DEFAULT;
+
+    RT_ASSERT(device != RT_NULL);
+
+    init_time = mktime(&time_new);
+    if (rt_rtc_config(device) != RT_EOK)
+    {
+        return -RT_ERROR;
+    }
+#ifdef RT_USING_DEVICE_OPS
+    device->ops         = &rtc_ops;
+#else
+    device->init        = RT_NULL;
+    device->open        = RT_NULL;
+    device->close       = RT_NULL;
+    device->read        = RT_NULL;
+    device->write       = RT_NULL;
+    device->control     = rt_rtc_control;
+#endif
+    device->type        = RT_Device_Class_RTC;
+    device->rx_indicate = RT_NULL;
+    device->tx_complete = RT_NULL;
+    device->user_data   = RT_NULL;
+
+    /* register a character device */
+    rt_device_register(device, name, flag);
+
+    return RT_EOK;
+}
+
+int rt_hw_rtc_init(void)
+{
+    rt_err_t result;
+    result = rt_hw_rtc_register(&rtc, "rtc", RT_DEVICE_FLAG_RDWR);
+    if (result != RT_EOK)
+    {
+        LOG_E("rtc register err code: %d", result);
+        return result;
+    }
+    LOG_D("rtc init success");
+    return RT_EOK;
+}
+INIT_DEVICE_EXPORT(rt_hw_rtc_init);
+
+#endif /* BSP_USING_ONCHIP_RTC */
+

bsp/nrf5x/nrf52832/board/Kconfig

@@ -313,6 +313,27 @@ endif
         int
         default 1
     endif
+
+    menuconfig BSP_USING_ONCHIP_RTC
+    bool "Enable RTC"
+    select RT_USING_RTC
+    select RT_USING_LIBC
+    select NRFX_CLOCK_ENABLED
+    default n
+    if BSP_USING_ONCHIP_RTC
+        config NRFX_CLOCK_ENABLED
+        int 
+        default 1
+        config NRFX_RTC_ENABLED
+        int 
+        default 1
+        config NRFX_RTC2_ENABLED
+        int 
+        default 1
+        config NRFX_CLOCK_DEFAULT_CONFIG_IRQ_PRIORITY
+        int
+        default 7
+    endif
 endmenu
 
 endmenu