[bsp/max32660] add onchip rtc support

bsp/maxim/MAX32660_EVSYS/README.md

@@ -76,7 +76,7 @@ MAX32660-EVSYS开发板常用 **板载资源** 如下：
 | UART         |     支持     | UART0, UART1(console) |
 | PWM          |              |                       |
 | SPI          |     支持     |      SPI0, SPI1       |
-| RTC          |              |                       |
+| RTC          |     支持     |      RTC              |
 | I2S          |              |                       |
 | I2C          |     支持     |      I2C0, I2C1       |
 | TIMER        |              |                       |

bsp/maxim/MAX32660_EVSYS/board/Kconfig

@@ -81,7 +81,11 @@ menu "On-chip Peripheral Drivers"
                 default n
         endif
             
-            
+     config BSP_USING_ONCHIP_RTC
+         bool "Enable RTC"
+         select RT_USING_RTC
+         select RT_USING_LIBC
+         default n
         
 endmenu
 

bsp/maxim/libraries/HAL_Drivers/SConscript

@@ -26,6 +26,8 @@ if GetDepend(['RT_USING_I2C']):
 if GetDepend(['RT_USING_I2C', 'RT_USING_I2C_BITOPS']):
     src += ['drv_soft_i2c.c']
 
+if GetDepend(['BSP_USING_ONCHIP_RTC']):
+    src += ['drv_rtc.c']
 
 if GetDepend(['BSP_USING_WDT']):
     src += ['drv_wdt.c']

bsp/maxim/libraries/HAL_Drivers/drv_rtc.c

@@ -0,0 +1,137 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date         Author        Notes
+ * 2021-03-15   picospuch     Porting for maxiam32660
+ */
+
+#include "rtc.h"
+#include "board.h"
+#include <sys/time.h>
+
+#ifdef BSP_USING_ONCHIP_RTC
+
+#define DBG_LEVEL   DBG_INFO
+#include <rtdbg.h>
+#define LOG_TAG                "drv.rtc"
+
+static struct rt_device rtc;
+
+static sys_cfg_rtc_t sys_cfg;
+
+static time_t get_rtc_timestamp(void)
+{
+    LOG_D("get rtc time.");
+    return RTC_GetSecond();
+}
+
+static rt_err_t set_rtc_time_stamp(time_t time_stamp)
+{
+  LOG_D("set rtc time.");
+
+  if (RTC_Init(MXC_RTC, time_stamp, 0, &sys_cfg) != E_SUCCESS) {
+    return -RT_ERROR;
+  }
+
+  if (RTC_EnableRTCE(MXC_RTC) != E_SUCCESS) {
+    return -RT_ERROR;
+  }
+
+  return RT_EOK;
+}
+
+static void rt_rtc_init(void)
+{
+  sys_cfg.tmr = MXC_TMR0;
+  RTC_Init(MXC_RTC, 0, 0, &sys_cfg);
+}
+
+static rt_err_t rt_rtc_config(struct rt_device *dev)
+{
+  if (RTC_EnableRTCE(MXC_RTC) != E_SUCCESS) {
+    return -RT_ERROR;
+  }
+  return RT_EOK;
+}
+
+static rt_err_t rt_rtc_control(rt_device_t dev, int cmd, void *args)
+{
+    rt_err_t result = RT_EOK;
+    RT_ASSERT(dev != RT_NULL);
+    switch (cmd)
+    {
+    case RT_DEVICE_CTRL_RTC_GET_TIME:
+        *(rt_uint32_t *)args = get_rtc_timestamp();
+        LOG_D("RTC: get rtc_time %x\n", *(rt_uint32_t *)args);
+        break;
+
+    case RT_DEVICE_CTRL_RTC_SET_TIME:
+        if (set_rtc_time_stamp(*(rt_uint32_t *)args))
+        {
+            result = -RT_ERROR;
+        }
+        LOG_D("RTC: set rtc_time %x\n", *(rt_uint32_t *)args);
+        break;
+    }
+
+    return result;
+}
+
+#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)
+{
+    RT_ASSERT(device != RT_NULL);
+
+    rt_rtc_init();
+    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 */
+    return rt_device_register(device, name, flag);
+}
+
+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 */