本文演示了如何在rtthread stm32f10x hal bsp下移值rtc驱动
环境
1. 开发板，正点原子ALIENTEK MiniSTM32 V3.4
2. rtthread 3.1.0
1. 增加drv_rtc.c驱动文件
添加drv_rtc.c文件到 bsp/stm32f10x-HAL/drivers 目录下，修改该目录下的SConscript文件，增加drv_rtc.c编译选择
if GetDepend(['RT_USING_RTC']):
src += ['drv_rtc.c']
2. 配置rtthread
通过env的menuconfig命令，打开 RT-Thread Components -> Device Drivers
[*] Using RTC device drivers [ ] Using software simulation RTC device [ ] Using NTP auto sync RTC time
3. drv_rtc.c源码
#include <board.h>
#include <rtdevice.h>
#include <string.h>
#include <time.h>
RTC_HandleTypeDef hrtc;
/* RTC init function */
void MX_RTC_Init(void)
{
RTC_TimeTypeDef sTime;
RTC_DateTypeDef sDate;
/**Initialize RTC Only
*/
hrtc.Instance = RTC;
//hrtc.Init.AsynchPrediv = RTC_AUTO_1_SECOND;
hrtc.Init.AsynchPrediv = 32767;
hrtc.Init.OutPut = RTC_OUTPUTSOURCE_NONE;
RT_ASSERT(HAL_RTC_Init(&hrtc) == HAL_OK);
/**Initialize RTC and set the Time and Date
*/
if (HAL_RTCEx_BKUPRead(&hrtc, RTC_BKP_DR1) != 0x32F2)
{
sTime.Hours = 9;
sTime.Minutes = 46;
sTime.Seconds = 0;
RT_ASSERT(HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BIN) == HAL_OK);
sDate.WeekDay = 4;
sDate.Month = 10;
sDate.Date = 25;
sDate.Year = 18;
RT_ASSERT(HAL_RTC_SetDate(&hrtc, &sDate, RTC_FORMAT_BIN) == HAL_OK);
}
HAL_RTCEx_BKUPWrite(&hrtc, RTC_BKP_DR1, 0x32F2);
}
void HAL_RTC_MspInit(RTC_HandleTypeDef *rtcHandle)
{
RCC_OscInitTypeDef RCC_OscInitStruct;
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
__HAL_RCC_PWR_CLK_ENABLE();
HAL_PWR_EnableBkUpAccess();
RCC_OscInitStruct.OscillatorType=RCC_OSCILLATORTYPE_LSE;
RCC_OscInitStruct.PLL.PLLState=RCC_PLL_NONE;
RCC_OscInitStruct.LSEState=RCC_LSE_ON;
HAL_RCC_OscConfig(&RCC_OscInitStruct);
PeriphClkInitStruct.PeriphClockSelection=RCC_PERIPHCLK_RTC;
PeriphClkInitStruct.RTCClockSelection=RCC_RTCCLKSOURCE_LSE;
HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
__HAL_RCC_RTC_ENABLE();
}
void HAL_RTC_MspDeInit(RTC_HandleTypeDef *rtcHandle)
{
__HAL_RCC_PWR_CLK_DISABLE();
__HAL_RCC_RTC_DISABLE();
}
static rt_err_t stm32_rtc_control(struct rt_device *dev,
int cmd,
void *args)
{
struct tm *tm_now;
struct tm now;
RTC_TimeTypeDef sTime;
RTC_DateTypeDef sDate;
rt_enter_critical();
/* converts calendar time time into local time. */
tm_now = localtime((const time_t *) args);
/* copy the statically located variable */
memcpy(&now, tm_now, sizeof(struct tm));
/* unlock scheduler. */
rt_exit_critical();
switch (cmd)
{
case RT_DEVICE_CTRL_RTC_GET_TIME:
HAL_RTC_GetTime(&hrtc, &sTime, RTC_FORMAT_BIN);
HAL_RTC_GetDate(&hrtc, &sDate, RTC_FORMAT_BIN);
now.tm_hour = sTime.Hours;
now.tm_min = sTime.Minutes;
now.tm_sec = sTime.Seconds;
now.tm_year = sDate.Year + 100;
now.tm_mon = sDate.Month - 1;
now.tm_mday = sDate.Date;
*((time_t *)args) = mktime(&now);
break;
case RT_DEVICE_CTRL_RTC_SET_TIME:
sTime.Hours = now.tm_hour;
sTime.Minutes = now.tm_min;
sTime.Seconds = now.tm_sec;
sDate.Year = now.tm_year - 100;
sDate.Month = now.tm_mon + 1;
sDate.Date = now.tm_mday;
HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BIN);
HAL_RTC_SetDate(&hrtc, &sDate, RTC_FORMAT_BIN);
break;
}
return RT_EOK;
}
static rt_err_t stm32_rtc_init(struct rt_device *dev)
{
return RT_EOK;
}
static rt_err_t stm32_rtc_open(struct rt_device *dev, rt_uint16_t oflag)
{
return RT_EOK;
}
static rt_err_t stm32_rtc_close(struct rt_device *dev)
{
return RT_EOK;
}
static rt_size_t stm32_rtc_read(struct rt_device *dev,
rt_off_t pos,
void *buffer,
rt_size_t size)
{
stm32_rtc_control(dev, RT_DEVICE_CTRL_RTC_GET_TIME, buffer);
return size;
}
static rt_size_t stm32_rtc_write(struct rt_device *dev,
rt_off_t pos,
const void *buffer,
rt_size_t size)
{
stm32_rtc_control(dev, RT_DEVICE_CTRL_RTC_SET_TIME, (void *)buffer);
return size;
}
struct rt_device rtc_device;
int rt_hw_rtc_init(void)
{
MX_RTC_Init();
rtc_device.type = RT_Device_Class_RTC;
rtc_device.rx_indicate = RT_NULL;
rtc_device.tx_complete = RT_NULL;
rtc_device.init = stm32_rtc_init;
rtc_device.open = stm32_rtc_open;
rtc_device.close = stm32_rtc_close;
rtc_device.read = stm32_rtc_read;
rtc_device.write = stm32_rtc_write;
rtc_device.control = stm32_rtc_control;
rtc_device.user_data = RT_NULL;
/* register a character device */
return rt_device_register(&rtc_device, "rtc", RT_DEVICE_FLAG_DEACTIVATE);
}
INIT_BOARD_EXPORT(rt_hw_rtc_init);
4. 在main线程中演示
在bsp/stm32f10x-HAL/applications/main.c 的main函数中，测试获取时间戳
while(1) {
rt_thread_mdelay(1000);
time_t now = time(0);
printf("main:%d\r\n",now);
}
可以看到屏幕每秒输出时间戳
main:1540461533
main:1540461534
main:1540461535
main:1540461536
5. 调试和问题
MX_RTC_Init函数中初始化rtc，包括分频，时钟使能，时钟源选择，根据硬件这里选择的是LSE时钟。如果配置错误，系统可能死在MX_RTC_Init中。
