Kenji Arai / Mbed OS Nucleo_RTC_battery_bkup_pwr_off_okay

In the past, you need modify rtc_api.c in mbed-dev source code. From this revision, you can just use RTC function all of conditions (Normal, Reset, Stand-by, Power OFF).

Note

From now on, you do NOT need any modification for mbed-dev library because STM team updates rtc_api.c source code and support RTC function under reset & standby condition includes power off condition (You need additional VBAT back-up hardware).

Please refer following NOTE information.
/users/kenjiArai/notebook/nucleo-series-rtc-control-under-power-onoff-and-re/

main.cpp@0:0751c92c0f71, 2015-02-07 (annotated)

Committer:
kenjiArai
Date:
Sat Feb 07 03:18:40 2015 +0000
Revision:
0:0751c92c0f71
Child:
1:7a48c475bbd2
This is a RTC additional function. This is only for F401RE & F411RE. If you connected battery backup circuit for internal RTC, you can make a power-off and reset condition. RTC still has proper time and date.; You can set the time & date by PC Com.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kenjiArai 0:0751c92c0f71 1 /*
kenjiArai 0:0751c92c0f71 2 * mbed Application program
kenjiArai 0:0751c92c0f71 3 * RTC (inside STM32x CPU) test program
kenjiArai 0:0751c92c0f71 4 *
kenjiArai 0:0751c92c0f71 5 * Copyright (c) 2015 Kenji Arai / JH1PJL
kenjiArai 0:0751c92c0f71 6 * http://www.page.sannet.ne.jp/kenjia/index.html
kenjiArai 0:0751c92c0f71 7 * http://mbed.org/users/kenjiArai/
kenjiArai 0:0751c92c0f71 8 * Created: January 17th, 2015
kenjiArai 0:0751c92c0f71 9 * Revised: Feburary 7th, 2015
kenjiArai 0:0751c92c0f71 10 *
kenjiArai 0:0751c92c0f71 11 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
kenjiArai 0:0751c92c0f71 12 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
kenjiArai 0:0751c92c0f71 13 * AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
kenjiArai 0:0751c92c0f71 14 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
kenjiArai 0:0751c92c0f71 15 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
kenjiArai 0:0751c92c0f71 16 */
kenjiArai 0:0751c92c0f71 17
kenjiArai 0:0751c92c0f71 18 // Include ---------------------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 19 #include "mbed.h"
kenjiArai 0:0751c92c0f71 20 #include "TextLCD.h"
kenjiArai 0:0751c92c0f71 21 #include "SetRTC.h"
kenjiArai 0:0751c92c0f71 22
kenjiArai 0:0751c92c0f71 23 // Definition ------------------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 24 #define SHOW_KEY_PROMPT 30
kenjiArai 0:0751c92c0f71 25
kenjiArai 0:0751c92c0f71 26 #define USE_LCD
kenjiArai 0:0751c92c0f71 27
kenjiArai 0:0751c92c0f71 28 // Object ----------------------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 29 DigitalIn userSW(USER_BUTTON);
kenjiArai 0:0751c92c0f71 30 DigitalOut myled(LED1); // Indicate the sampling period
kenjiArai 0:0751c92c0f71 31 Serial pc(USBTX, USBRX);
kenjiArai 0:0751c92c0f71 32 #if defined(USE_LCD)
kenjiArai 0:0751c92c0f71 33 I2C i2c(D14,D15); // SDA, SCL
kenjiArai 0:0751c92c0f71 34 TextLCD_I2C_N lcd(&i2c, 0x7c, TextLCD::LCD8x2); // LCD(Akizuki AQM0802A)
kenjiArai 0:0751c92c0f71 35 #endif
kenjiArai 0:0751c92c0f71 36
kenjiArai 0:0751c92c0f71 37 // RAM -------------------------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 38
kenjiArai 0:0751c92c0f71 39 // ROM / Constant data ---------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 40
kenjiArai 0:0751c92c0f71 41 // Function prototypes ---------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 42
kenjiArai 0:0751c92c0f71 43 //-------------------------------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 44 // Control Program
kenjiArai 0:0751c92c0f71 45 //-------------------------------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 46 int main()
kenjiArai 0:0751c92c0f71 47 {
kenjiArai 0:0751c92c0f71 48 char buf[42]; // data buffer for text
kenjiArai 0:0751c92c0f71 49 time_t seconds;
kenjiArai 0:0751c92c0f71 50 uint8_t counter = SHOW_KEY_PROMPT;
kenjiArai 0:0751c92c0f71 51
kenjiArai 0:0751c92c0f71 52 #if defined(USE_LCD)
kenjiArai 0:0751c92c0f71 53 // lcd
kenjiArai 0:0751c92c0f71 54 lcd.locate(0, 0); // 1st line top
kenjiArai 0:0751c92c0f71 55 // 12345678
kenjiArai 0:0751c92c0f71 56 lcd.printf(" RTC ");
kenjiArai 0:0751c92c0f71 57 lcd.locate(0, 1); // 2nd line top
kenjiArai 0:0751c92c0f71 58 // 12345678
kenjiArai 0:0751c92c0f71 59 lcd.puts(" JH1PJL ");
kenjiArai 0:0751c92c0f71 60 lcd.setContrast(0x14);
kenjiArai 0:0751c92c0f71 61 #endif
kenjiArai 0:0751c92c0f71 62 pc.printf("\r\n\r\nTest Nucleo RTC Function\r\n");
kenjiArai 0:0751c92c0f71 63 // waiting for Initial screen
kenjiArai 0:0751c92c0f71 64 myled = 1;
kenjiArai 0:0751c92c0f71 65 wait(1.0);
kenjiArai 0:0751c92c0f71 66 myled = !myled;
kenjiArai 0:0751c92c0f71 67 wait(1.0);
kenjiArai 0:0751c92c0f71 68 myled = !myled;
kenjiArai 0:0751c92c0f71 69 if (SetRTC() == OK) {
kenjiArai 0:0751c92c0f71 70 pc.printf("External Xtal for RTC\r\n");
kenjiArai 0:0751c92c0f71 71 } else {
kenjiArai 0:0751c92c0f71 72 pc.printf("Internal Xtal for RTC\r\n");
kenjiArai 0:0751c92c0f71 73 }
kenjiArai 0:0751c92c0f71 74 show_RTC_reg(); // only for debug purpose
kenjiArai 0:0751c92c0f71 75 while(1) {
kenjiArai 0:0751c92c0f71 76 myled = !myled;
kenjiArai 0:0751c92c0f71 77 seconds = time(NULL);
kenjiArai 0:0751c92c0f71 78 strftime(buf, 40, " %B %d,'%y, %H:%M:%S\r\n", localtime(&seconds));
kenjiArai 0:0751c92c0f71 79 pc.printf("[Time] %s", buf);
kenjiArai 0:0751c92c0f71 80 #if defined(USE_LCD)
kenjiArai 0:0751c92c0f71 81 lcd.locate(0, 0); // 1st line top
kenjiArai 0:0751c92c0f71 82 strftime(buf, 40, "%b%d'%y", localtime(&seconds));
kenjiArai 0:0751c92c0f71 83 lcd.printf(buf);
kenjiArai 0:0751c92c0f71 84 lcd.locate(0, 1); // 2nd line top
kenjiArai 0:0751c92c0f71 85 strftime(buf, 10, "%H:%M:%S", localtime(&seconds));
kenjiArai 0:0751c92c0f71 86 lcd.printf(buf);
kenjiArai 0:0751c92c0f71 87 #endif
kenjiArai 0:0751c92c0f71 88 if (counter){
kenjiArai 0:0751c92c0f71 89 --counter;
kenjiArai 0:0751c92c0f71 90 // 012345678901234567890123456789012345678901234567890123456789012
kenjiArai 0:0751c92c0f71 91 pc.printf("Is time correct? If okay, nothing. If not, please hit any key.\r");
kenjiArai 0:0751c92c0f71 92 wait(1.0);
kenjiArai 0:0751c92c0f71 93 if (pc.readable() == 1){
kenjiArai 0:0751c92c0f71 94 buf[0] = pc.getc(); // dummy read
kenjiArai 0:0751c92c0f71 95 time_enter_mode();
kenjiArai 0:0751c92c0f71 96 counter = SHOW_KEY_PROMPT;
kenjiArai 0:0751c92c0f71 97 }
kenjiArai 0:0751c92c0f71 98 pc.printf(" \r");
kenjiArai 0:0751c92c0f71 99 } else {
kenjiArai 0:0751c92c0f71 100 wait(1.0);
kenjiArai 0:0751c92c0f71 101 }
kenjiArai 0:0751c92c0f71 102 if (userSW == 0){
kenjiArai 0:0751c92c0f71 103 #if defined(USE_LCD)
kenjiArai 0:0751c92c0f71 104 lcd.locate(0, 0); // 1st line top
kenjiArai 0:0751c92c0f71 105 // 12345678
kenjiArai 0:0751c92c0f71 106 lcd.printf(" Enter ");
kenjiArai 0:0751c92c0f71 107 lcd.locate(0, 1); // 2nd line top
kenjiArai 0:0751c92c0f71 108 // 12345678
kenjiArai 0:0751c92c0f71 109 lcd.printf(" Sleep " );
kenjiArai 0:0751c92c0f71 110 #endif
kenjiArai 0:0751c92c0f71 111 pc.printf("\r\nEnter Deep Sleep Mode, please push RESET to wake-up\r\n");
kenjiArai 0:0751c92c0f71 112 wait(1.0);
kenjiArai 0:0751c92c0f71 113 myled = 0;
kenjiArai 0:0751c92c0f71 114 deepsleep();
kenjiArai 0:0751c92c0f71 115 }
kenjiArai 0:0751c92c0f71 116 }
kenjiArai 0:0751c92c0f71 117 }