Maxim Ibragimov
Solution how to fix broken RTC on Nucleo_F103RB / STM32F103 BluePill etc..
Fork of
Nucleo_RTC_battery_bkup_pwr_off_okay
by 
Kenji Arai
Experimental fork https://os.mbed.com/users/kenjiArai/code/Nucleo_RTC_battery_bkup_pwr_off_okay/ to fix broken RTC on Nucleo_F103RB / STM32F103 BluePill etc..
At this moment (7/11/17) use forked mbed-dev https://os.mbed.com/users/maxxir/code/mbed-dev/.
Or require patch for ./mbed-dev/targets/TARGET_STM/rtc_api.c.
You can manual add to your project fresh mbed-dev and change file mbed-dev\targets\TARGET_STM\rtc_api.c from root project patched rtc_api.c.stm32f10x.txt.
Exploring origin errors, I saw that something wrong with HAL API on STM32F1xx with this functions:
HAL_RTC_GetTime(&RtcHandle, &timeStruct, RTC_FORMAT_BIN); HAL_RTC_GetDate(&RtcHandle, &dateStruct, RTC_FORMAT_BIN); HAL_RTC_SetDate(&RtcHandle, &dateStruct, RTC_FORMAT_BIN); HAL_RTC_SetTime(&RtcHandle, &timeStruct, RTC_FORMAT_BIN);
Look here (as I understand it possible broken on STM32CUBE HAL level now):
https://community.st.com/thread/43218-stm32f103-loss-rtc-date-when-reset
So I use direct RTC register manipulation for STM32F1xx:
rtc_read(), rtc_write() (native rtc_init() - works good).
Also added stub for non-working on STM32F1xx rtc_read_subseconds().
Now the stm32F103 can survive power off, and allows you to get and set the time.
Tested OK on boards:
NUCLEO STM32F103RB, DIY STM32F100CB (forked from DISCO_F100RB)
Happy coding!
maxxir
10/11/17
Diff: main.cpp
- Revision:
- 8:bf593344668e
- Parent:
- 7:27a1cf7f8921
- Child:
- 9:6a64b0207f72
--- a/main.cpp Fri May 27 20:19:49 2016 +0000
+++ b/main.cpp Sat Jul 02 03:08:52 2016 +0000
@@ -6,7 +6,7 @@
* http://www.page.sannet.ne.jp/kenjia/index.html
* http://mbed.org/users/kenjiArai/
* Created: January 17th, 2015
- * Revised: May 28th, 2016
+ * Revised: July 2nd, 2016
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
@@ -22,15 +22,20 @@
#include "SetRTC.h"
// Definition ------------------------------------------------------------------------------------
-#define SHOW_KEY_PROMPT 30
-
//#define USE_LCD
#if (defined(TARGET_STM32F401RE) || defined(TARGET_STM32F411RE) \
|| defined(TARGET_STM32L152RE) || defined(TARGET_STM32F334R8) \
- || defined(TARGET_STM32L476RG) )
+ || defined(TARGET_STM32L476RG) \
+ || defined(TARGET_STM32F746NG) || defined(TARGET_STM32F746ZG) )
#else
-#error "Target is only Nucleo F401RE, F411RE, F334R8, L476RG and L152RE"
+#error "Target is only Nucleo F401RE, F411RE, F334R8, F746xx, L476RG and L152RE"
+#endif
+
+#if (defined(TARGET_STM32F746NG) || defined(TARGET_STM32F746ZG))
+#define PUSHED_SW 1 // Active high
+#else
+#define PUSHED_SW 0 // Active low
#endif
// Object ----------------------------------------------------------------------------------------
@@ -46,7 +51,12 @@
// RAM -------------------------------------------------------------------------------------------
// ROM / Constant data ---------------------------------------------------------------------------
-
+char *const msg0 = "Is a time correct? If no, please hit any key. ";
+char *const msg1 = "<Push USER SW then enter sleep mode> ";
+char *const msg2 = "\r\nEnter Standby Mode, please push RESET to wake-up\r\n";
+char *const msg3 = "Time was not updated! External Xtal does NOT oscillate.\r\n";
+char *const msg4 = "Time was not updated! LSI does NOT work.\r\n";
+
// Function prototypes ---------------------------------------------------------------------------
//-------------------------------------------------------------------------------------------------
@@ -54,9 +64,8 @@
//-------------------------------------------------------------------------------------------------
int main()
{
- char buf[42]; // data buffer for text
+ char buf[64]; // data buffer for text
time_t seconds;
- uint8_t counter = SHOW_KEY_PROMPT;
uint8_t wait_counter = 0;
uint8_t xtal = 0;
@@ -90,7 +99,7 @@
wait(1.0);
while(1) {
seconds = time(NULL);
- strftime(buf, 40, " %B %d,'%y, %H:%M:%S\r\n", localtime(&seconds));
+ strftime(buf, 50, " %B %d,'%y, %H:%M:%S\r\n", localtime(&seconds));
if (xtal){
pc.printf("[Time] %s", buf);
} else {
@@ -104,18 +113,15 @@
strftime(buf, 10, "%H:%M:%S", localtime(&seconds));
lcd.printf(buf);
#endif
- --counter;
- if (counter){
- // 012345678901234567890123456789012345678901234567890123456789012
- pc.printf("Is a time correct? If no, please hit any key for adjustment.\r");
- }
+ pc.printf(msg0);
+ pc.printf("%s\r", msg1);
wait_counter = 0;
while (seconds == time(NULL)){
if (pc.readable() == 1){
buf[0] = pc.getc(); // dummy read
time_enter_mode();
}
- if (userSW == 0){
+ if (userSW == PUSHED_SW){
#if defined(USE_LCD)
lcd.locate(0, 0); // 1st line top
// 12345678
@@ -124,8 +130,7 @@
// 12345678
lcd.printf(" Sleep " );
#endif
- // 123456789012345678901234567890123456789012345678
- pc.printf("\r\nEnter Standby Mode, please push RESET to wake-up\r\n");
+ pc.printf(msg2);
wait(1.0);
myled = 0;
goto_standby();
@@ -133,17 +138,18 @@
wait(0.05);
if (++wait_counter > (2000 / 50)){
if (xtal){
- pc.printf("Time was not updated! External Xtal does NOT oscillate.\r\n");
+ pc.printf(msg3);
} else {
- pc.printf("Time was not updated! LSI does NOT work.\r\n");
+ pc.printf(msg4);
}
break;
}
}
- if (counter){
- // 12345678901234567890123456789012345678901234567890
- pc.printf(" \r"); // Not use '\n'
+ uint8_t n = strlen(msg0) + strlen(msg1);
+ for (uint8_t i = 0; i < n; i++){
+ pc.putc(' ');
}
+ pc.printf(" \r"); // Not use '\n'
myled = !myled;
}
}