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@4:a9cebfe4715f, 2015-02-19 (annotated)

Committer:
kenjiArai
Date:
Thu Feb 19 02:59:11 2015 +0000
Revision:
4:a9cebfe4715f
Parent:
3:7b3edf54c706
Child:
5:bc464a588c2e
Bug fix when External Xtal is not avairable. In addtion change checking method for STM32xxx register status

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 4:a9cebfe4715f 9 * Revised: Feburary 19th, 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 2:77ec44bf1fa5 21 // MUST -> need to modify rtc_api.c, please refer SetRTC.h file [CAUTION] and modify_info_xxx.h
kenjiArai 0:0751c92c0f71 22 #include "SetRTC.h"
kenjiArai 0:0751c92c0f71 23
kenjiArai 0:0751c92c0f71 24 // Definition ------------------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 25 #define SHOW_KEY_PROMPT 30
kenjiArai 0:0751c92c0f71 26
kenjiArai 0:0751c92c0f71 27 #define USE_LCD
kenjiArai 0:0751c92c0f71 28
kenjiArai 1:7a48c475bbd2 29 #if defined(TARGET_NUCLEO_F401RE) || defined(TARGET_NUCLEO_F411RE) || defined(TARGET_NUCLEO_L152RE)
kenjiArai 1:7a48c475bbd2 30 #else
kenjiArai 1:7a48c475bbd2 31 #error "Target is only Nucleo F401RE, F411RE and L152RE"
kenjiArai 1:7a48c475bbd2 32 #endif
kenjiArai 1:7a48c475bbd2 33
kenjiArai 0:0751c92c0f71 34 // Object ----------------------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 35 DigitalIn userSW(USER_BUTTON);
kenjiArai 0:0751c92c0f71 36 DigitalOut myled(LED1); // Indicate the sampling period
kenjiArai 0:0751c92c0f71 37 Serial pc(USBTX, USBRX);
kenjiArai 0:0751c92c0f71 38 #if defined(USE_LCD)
kenjiArai 0:0751c92c0f71 39 I2C i2c(D14,D15); // SDA, SCL
kenjiArai 0:0751c92c0f71 40 TextLCD_I2C_N lcd(&i2c, 0x7c, TextLCD::LCD8x2); // LCD(Akizuki AQM0802A)
kenjiArai 0:0751c92c0f71 41 #endif
kenjiArai 0:0751c92c0f71 42
kenjiArai 0:0751c92c0f71 43 // RAM -------------------------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 44
kenjiArai 0:0751c92c0f71 45 // ROM / Constant data ---------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 46
kenjiArai 0:0751c92c0f71 47 // Function prototypes ---------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 48
kenjiArai 0:0751c92c0f71 49 //-------------------------------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 50 // Control Program
kenjiArai 0:0751c92c0f71 51 //-------------------------------------------------------------------------------------------------
kenjiArai 0:0751c92c0f71 52 int main()
kenjiArai 0:0751c92c0f71 53 {
kenjiArai 0:0751c92c0f71 54 char buf[42]; // data buffer for text
kenjiArai 0:0751c92c0f71 55 time_t seconds;
kenjiArai 0:0751c92c0f71 56 uint8_t counter = SHOW_KEY_PROMPT;
kenjiArai 4:a9cebfe4715f 57 uint8_t wait_counter = 0;
kenjiArai 4:a9cebfe4715f 58 uint8_t xtal = 0;
kenjiArai 0:0751c92c0f71 59
kenjiArai 0:0751c92c0f71 60 #if defined(USE_LCD)
kenjiArai 0:0751c92c0f71 61 // lcd
kenjiArai 0:0751c92c0f71 62 lcd.locate(0, 0); // 1st line top
kenjiArai 0:0751c92c0f71 63 // 12345678
kenjiArai 0:0751c92c0f71 64 lcd.printf(" RTC ");
kenjiArai 0:0751c92c0f71 65 lcd.locate(0, 1); // 2nd line top
kenjiArai 0:0751c92c0f71 66 // 12345678
kenjiArai 0:0751c92c0f71 67 lcd.puts(" JH1PJL ");
kenjiArai 0:0751c92c0f71 68 lcd.setContrast(0x14);
kenjiArai 0:0751c92c0f71 69 #endif
kenjiArai 0:0751c92c0f71 70 pc.printf("\r\n\r\nTest Nucleo RTC Function\r\n");
kenjiArai 2:77ec44bf1fa5 71 myled = !myled;
kenjiArai 4:a9cebfe4715f 72 if (SetRTC() == 1) {
kenjiArai 2:77ec44bf1fa5 73 pc.printf("External");
kenjiArai 4:a9cebfe4715f 74 xtal = 1;
kenjiArai 2:77ec44bf1fa5 75 } else {
kenjiArai 2:77ec44bf1fa5 76 pc.printf("Internal");
kenjiArai 4:a9cebfe4715f 77 xtal = 0;
kenjiArai 2:77ec44bf1fa5 78 }
kenjiArai 2:77ec44bf1fa5 79 pc.printf(" Xtal for RTC\r\n");
kenjiArai 2:77ec44bf1fa5 80 show_RTC_reg(); // only for debug purpose
kenjiArai 0:0751c92c0f71 81 // waiting for Initial screen
kenjiArai 0:0751c92c0f71 82 myled = 1;
kenjiArai 0:0751c92c0f71 83 wait(1.0);
kenjiArai 0:0751c92c0f71 84 myled = !myled;
kenjiArai 0:0751c92c0f71 85 wait(1.0);
kenjiArai 0:0751c92c0f71 86 while(1) {
kenjiArai 0:0751c92c0f71 87 seconds = time(NULL);
kenjiArai 0:0751c92c0f71 88 strftime(buf, 40, " %B %d,'%y, %H:%M:%S\r\n", localtime(&seconds));
kenjiArai 4:a9cebfe4715f 89 if (xtal){
kenjiArai 4:a9cebfe4715f 90 pc.printf("[Time] %s", buf);
kenjiArai 4:a9cebfe4715f 91 } else {
kenjiArai 4:a9cebfe4715f 92 pc.printf("[Time by Internal Clock] %s", buf);
kenjiArai 4:a9cebfe4715f 93 }
kenjiArai 0:0751c92c0f71 94 #if defined(USE_LCD)
kenjiArai 0:0751c92c0f71 95 lcd.locate(0, 0); // 1st line top
kenjiArai 0:0751c92c0f71 96 strftime(buf, 40, "%b%d'%y", localtime(&seconds));
kenjiArai 0:0751c92c0f71 97 lcd.printf(buf);
kenjiArai 0:0751c92c0f71 98 lcd.locate(0, 1); // 2nd line top
kenjiArai 0:0751c92c0f71 99 strftime(buf, 10, "%H:%M:%S", localtime(&seconds));
kenjiArai 0:0751c92c0f71 100 lcd.printf(buf);
kenjiArai 0:0751c92c0f71 101 #endif
kenjiArai 2:77ec44bf1fa5 102 --counter;
kenjiArai 0:0751c92c0f71 103 if (counter){
kenjiArai 0:0751c92c0f71 104 // 012345678901234567890123456789012345678901234567890123456789012
kenjiArai 1:7a48c475bbd2 105 pc.printf("Is time correct? If no, hit any key.\r");
kenjiArai 2:77ec44bf1fa5 106 }
kenjiArai 4:a9cebfe4715f 107 wait_counter = 0;
kenjiArai 2:77ec44bf1fa5 108 while (seconds == time(NULL)){
kenjiArai 0:0751c92c0f71 109 if (pc.readable() == 1){
kenjiArai 0:0751c92c0f71 110 buf[0] = pc.getc(); // dummy read
kenjiArai 0:0751c92c0f71 111 time_enter_mode();
kenjiArai 0:0751c92c0f71 112 }
kenjiArai 2:77ec44bf1fa5 113 if (userSW == 0){
kenjiArai 0:0751c92c0f71 114 #if defined(USE_LCD)
kenjiArai 2:77ec44bf1fa5 115 lcd.locate(0, 0); // 1st line top
kenjiArai 2:77ec44bf1fa5 116 // 12345678
kenjiArai 2:77ec44bf1fa5 117 lcd.printf(" Enter ");
kenjiArai 2:77ec44bf1fa5 118 lcd.locate(0, 1); // 2nd line top
kenjiArai 2:77ec44bf1fa5 119 // 12345678
kenjiArai 2:77ec44bf1fa5 120 lcd.printf(" Sleep " );
kenjiArai 0:0751c92c0f71 121 #endif
kenjiArai 3:7b3edf54c706 122 // 123456789012345678901234567890123456789012345678
kenjiArai 3:7b3edf54c706 123 pc.printf("\r\nEnter Standby Mode, please push RESET to wake-up\r\n");
kenjiArai 2:77ec44bf1fa5 124 wait(1.0);
kenjiArai 2:77ec44bf1fa5 125 myled = 0;
kenjiArai 3:7b3edf54c706 126 goto_standby();
kenjiArai 2:77ec44bf1fa5 127 }
kenjiArai 4:a9cebfe4715f 128 wait(0.05);
kenjiArai 4:a9cebfe4715f 129 if (++wait_counter > (2000 / 50)){
kenjiArai 4:a9cebfe4715f 130 if (xtal){
kenjiArai 4:a9cebfe4715f 131 pc.printf("Time was not updated! External Xtal does NOT oscillate.\r\n");
kenjiArai 4:a9cebfe4715f 132 } else {
kenjiArai 4:a9cebfe4715f 133 pc.printf("Time was not updated! LSI does NOT work.\r\n");
kenjiArai 4:a9cebfe4715f 134 }
kenjiArai 4:a9cebfe4715f 135 break;
kenjiArai 4:a9cebfe4715f 136 }
kenjiArai 0:0751c92c0f71 137 }
kenjiArai 2:77ec44bf1fa5 138 if (counter){
kenjiArai 3:7b3edf54c706 139 // 12345678901234567890123456789012345678901234567890
kenjiArai 3:7b3edf54c706 140 pc.printf(" \r");
kenjiArai 2:77ec44bf1fa5 141 }
kenjiArai 2:77ec44bf1fa5 142 myled = !myled;
kenjiArai 0:0751c92c0f71 143 }
kenjiArai 0:0751c92c0f71 144 }