Cubemx 4.4.0 rtc bug

[totti001]

Posted on October 17, 2014 at 21:30

Hello everybody!

I found a bug with the new cubemx and rtc clock code generation. So I set te RTC paramters at cubemx, the first what I see that the sync predivider limited to max 255, but this is a 16bit variable in the mikrocontroller. So second bug, that the generated code:

/**
******************************************************************************
* File Name : RTC.c
* Date : 17/10/2014 21:20:24
* Description : This file provides code for the configuration
* of the RTC instances.
******************************************************************************
*
* COPYRIGHT(c) 2014 STMicroelectronics
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of STMicroelectronics nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ''AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include ''rtc.h''
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
RTC_HandleTypeDef hrtc;
/* RTC init function */
void MX_RTC_Init(void)
{
RTC_TimeTypeDef sTime;
RTC_DateTypeDef sDate;
/**Initialize RTC and set the Time and Date 
*/
hrtc.Instance = RTC;
hrtc.Init.HourFormat = RTC_HOURFORMAT_24;
hrtc.Init.AsynchPrediv = 127;
hrtc.Init.SynchPrediv = 255;
hrtc.Init.OutPut = RTC_OUTPUT_DISABLE;
hrtc.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
hrtc.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
sTime.Hours = 0;
sTime.Minutes = 0;
sTime.Seconds = 0;
sTime.SubSeconds = 0;
sTime.TimeFormat = RTC_HOURFORMAT12_AM;
sTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
sTime.StoreOperation = RTC_STOREOPERATION_RESET;
sDate.WeekDay = RTC_WEEKDAY_MONDAY;
sDate.Month = RTC_MONTH_JANUARY;
sDate.Date = 1;
sDate.Year = 0;
/**Enable the WakeUp 
*/
}
void HAL_RTC_MspInit(RTC_HandleTypeDef* hrtc)
{
if(hrtc->Instance==RTC)
{
/* USER CODE BEGIN RTC_MspInit 0 */
/* USER CODE END RTC_MspInit 0 */
/* Peripheral interrupt init*/
HAL_NVIC_SetPriority(RTC_WKUP_IRQn, 1, 0);
HAL_NVIC_EnableIRQ(RTC_WKUP_IRQn);
/* USER CODE BEGIN RTC_MspInit 1 */
/* USER CODE END RTC_MspInit 1 */
}
}
void HAL_RTC_MspDeInit(RTC_HandleTypeDef* hrtc)
{
if(hrtc->Instance==RTC)
{
/* USER CODE BEGIN RTC_MspDeInit 0 */
/* USER CODE END RTC_MspDeInit 0 */
/* Peripheral interrupt Deinit*/
HAL_NVIC_DisableIRQ(RTC_WKUP_IRQn);
/* USER CODE BEGIN RTC_MspDeInit 1 */
/* USER CODE END RTC_MspDeInit 1 */
}
} 
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

What we see, that te MX_RTC_Init function doesn't do anything. What can I do this sutiation? I use stm32f407ig controller and the latest cubemx softwares. Thanks

[stm32cube-t]

Posted on November 13, 2014 at 17:39

Hello,

There is a known MX issue (#

272065

will be fixed in 4.6). Can you please add the following macro to the

HAL_RTC_MspInit

() function:

__HAL_RCC_RTC_ENABLE();

Regarding the Max presync divider value, thank you for pointing this out. Best regards

[totti001]

Posted on November 14, 2014 at 12:48

Thank you very much. Now the RTC is working well.

One thing about RTC init. I think it will be best, if the RTC init is checking the reset flag before init the time and date to 0.

[totti001]

Posted on November 17, 2014 at 13:37

I've found a new error with RTC. I have an application which uses RTC. I configured a wake up to feed a watchdog. An other function that I can stop the device. I this function I stop all of the tasks, and take device to stop mode. Only the RTC wake up and a user switch can wake up. The requirement that the user need to press the button for 3 seconds to start the device. I wrote the code. It is working well with standard library 1.3.0. But with stm32cube doesn't. The problem is when I get the current seconds, it is working only once. After that all of the readings get the same value. So the elapsed time 0 forever.

What is the problem?

while(Stop_mode == ENABLE /*&& (button_Pressed != ENABLE)*/)
{
/* Disable systick */
Systick_disable();
//Display_BacklightOff();
/* Enter Stop Mode */
//HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
/* Return from stop mode*/
volatile uint8_t start_time;
volatile uint8_t act_time;
/* Get the current time */
HAL_RTC_GetTime(&hrtc,&RTC_TimeStructure,FORMAT_BIN);
start_time = RTC_TimeStructure.Seconds;
/* Read the wake-up pin state*/
while(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_0))
{
/* Get the current time */
HAL_RTC_GetTime(&hrtc,&RTC_TimeStructure,FORMAT_BIN);
act_time = RTC_TimeStructure.Seconds;
/* Calculate the elapsed time*/
volatile int8_t elapsed_time = (int8_t)(act_time - start_time);
/* If start time bigger than act time, add 60 to elapsed time*/
if(elapsed_time < 
0
)
{
elapsed_time+=60;
}
/* If the waiting time is reached, exit from stop mode*/
if(elapsed_time > STOP_MODE_WAIT_TIME)
{
Power_Exit_Stopmode();
break;
}
}
}

[totti001]

Posted on November 17, 2014 at 17:29

I've compared the stm32cube and the standard library RTC_Get_Time functions.

One difference in the cube file is this: sTime->SubSeconds = (uint32_t)(hrtc->Instance->SSR); If I comment this line the program is working. Maybe the frequently reading is the bug.