Kenji Arai
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/
Diff: main.cpp
- Revision:
- 11:2e514d955a2b
- Parent:
- 10:806cfec92eb6
- Child:
- 12:8cb1f89541d1
--- a/main.cpp Sat Jul 18 22:46:14 2020 +0000
+++ b/main.cpp Sat Aug 01 07:26:13 2020 +0000
@@ -6,7 +6,7 @@
* http://www7b.biglobe.ne.jp/~kenjia/
* https://os.mbed.com/users/kenjiArai/
* Created: January 17th, 2015
- * Revised: July 19th, 2020
+ * Revised: August 1st, 2020
*/
/* mbed library now suports RTC continuous operation at Reset & Power ON/OFF
@@ -24,17 +24,17 @@
Nucleo-F401RE / ok / ok / ok (need following Back-up Circuit)
Nucleo-F411RE / ok / ok / ok (need following Back-up Circuit)
Nucleo-F446RE / ok / ok / ok (need following Back-up Circuit)
- Nucleo-F334R8 / ok / ok / ok (need following Back-up Circuit)
+ not support on Mbed-os6.2.0 Nucleo-F334R8
Nucleo-L476RG / ok / ok / ok (need following Back-up Circuit)
DISCO-L45VG-IOT/ ok / ok / ok (Need additional hardware)
Nucleo-L152RE / ok / ok / no check (Need additional hardware)
Nucleo-L073RZ / ok / ok / no check (Need additional hardware)
- Nucleo-L053R8 / ok / ok / no check (Need additional hardware)
+ not support on Mbed-os6.2.0 Nucleo-L053R8
< Back-up circuit >
CN7 VIN <- SBD <- 330 Ohm <- CR2032 + - -> CN7 GND
Remove SB45 Zero Ohm resistor
-
+
----- PLEASE REFER FOLLOWS ----
https://os.mbed.com/users/kenjiArai/notebook/
nucleo-series-rtc-control-under-power-onoff-and-re/
@@ -55,17 +55,17 @@
// Object ---------------------------------------------------------------------
DigitalIn userSW(USER_BUTTON);
DigitalOut myled(LED1); // Indicate the sampling period
-static RawSerial pc(USBTX, USBRX);
+// Create a BufferedSerial object to be used by the system I/O retarget code
+static BufferedSerial pc(USBTX, USBRX, 9600);
// RAM ------------------------------------------------------------------------
// ROM / Constant data --------------------------------------------------------
const char *const msg0 = "Is a time correct? If no, please hit any key. ";
const char *const msg1 = "<Push USER SW then enter the Standby mode> ";
-const char *const msg2 = "\r\nEntered the standby mode. ";
-const char *const msg3 = "Please push USER BUTTON to wake-up(Reset).\r\n";
// Function prototypes --------------------------------------------------------
+FileHandle *mbed::mbed_override_console(int fd);
static void time_enter_mode(void);
static void chk_and_set_time(char *ptr);
static int32_t xatoi (char **str, int32_t *res);
@@ -78,11 +78,11 @@
//------------------------------------------------------------------------------
int main()
{
- char buf[64]; // data buffer for text
+ char buf[64];
time_t seconds;
uint8_t wait_counter = 0;
- pc.printf("\r\n\r\nTest Nucleo RTC Function\r\n");
+ puts("\r\n\r\nTest Nucleo RTC Function.");
print_revision();
myled = !myled;
thread_sleep_for(500);
@@ -91,21 +91,23 @@
while(true) {
seconds = time(NULL);
strftime(buf, 50, " %B %d,'%y, %H:%M:%S\r\n", localtime(&seconds));
- pc.printf("[Time] %s", buf);
- pc.printf("%s", msg0);
- pc.printf("%s\r", msg1);
+ printf("[Time] %s", buf);
+ printf("%s", msg0);
+ printf("%s", msg1);
+ puts("\r");
wait_counter = 0;
- while (seconds == time(NULL)){
- if (pc.readable() == 1){
- buf[0] = pc.getc(); // dummy read
+ while (seconds == time(NULL)) {
+ if (pc.readable() == 1) {
+ pc.read(buf,1); // dummy read
time_enter_mode();
}
- if (userSW == PUSHED_SW){ // goto sleep
- while (userSW == PUSHED_SW){
+ if (userSW == PUSHED_SW) { // goto sleep
+ while (userSW == PUSHED_SW) {
thread_sleep_for(10);
}
thread_sleep_for(10);
- pc.printf("%s%s", msg2, msg3);
+ puts("Entered the standby mode. ");
+ puts("Please push USER BUTTON to wake-up(Reset).");
myled = 0;
InterruptIn usr_sw(USER_BUTTON);
thread_sleep_for(1000);
@@ -116,19 +118,35 @@
thread_sleep_for(LONGLONGTIME);
}
thread_sleep_for(50);
- if (++wait_counter > (2000 / 50)){
+ if (++wait_counter > (2000 / 50)) {
break;
}
}
+ // delete previous strings
+ printf("\033[2A");
+ puts(""); // null
uint8_t n = strlen(msg0) + strlen(msg1);
- for (uint8_t i = 0; i < n; i++){
- pc.putc(' ');
+ memset(buf, ' ', 64);
+ if (n > 64) {
+ n -= 64;
+ pc.write(buf, 64);
}
- pc.printf(" \r"); // Not use '\n'
+ if (n > 64) {
+ pc.write(buf, 64);
+ } else {
+ pc.write(buf, n);
+ }
+ printf("\033[G");
myled = !myled;
}
}
+// the system I/O retarget
+FileHandle *mbed::mbed_override_console(int fd)
+{
+ return &pc;
+}
+
// Interrupt for wake up
static void usr_sw_irq(void)
{
@@ -141,13 +159,14 @@
char *ptr;
char linebuf[64];
- pc.printf("\r\nSet time into RTC\r\n");
- pc.printf(" e.g. >20 7 7 20 21 22 -> July 7,'20, 20:21:22\r\n");
- pc.printf(" If time is fine, just hit enter key\r\n");
- pc.putc('>');
+ puts("Set time into RTC.");
+ puts(" e.g. >20 8 1 12 34 56 -> August 01,'20, 12:34:56");
+ puts(" If time is fine, just hit enter key.");
+ linebuf[0] = '>';
+ pc.write(linebuf, 1);
ptr = linebuf;
get_line(ptr, sizeof(linebuf));
- pc.printf("\r");
+ puts("\r");
chk_and_set_time(ptr);
}
@@ -210,27 +229,31 @@
static void get_line(char *buff, int32_t len)
{
char c;
+ char bf[8];
int32_t idx = 0;
for (;;) {
- c = pc.getc();
+ pc.read(bf, 1);
+ c = bf[0];
+ //printf("0x%x \r\n", c);
if (c == '\r') {
buff[idx++] = c;
break;
}
if ((c == '\b') && idx) {
idx--;
- pc.putc(c);
- pc.putc(' ');
- pc.putc(c);
+ const char bf_bs[] =
+ {0x1b, '[', '1', 'D', ' ', 0x1b, '[', '1', 'D'};
+ pc.write(bf_bs, 9);
}
if (((uint8_t)c >= ' ') && (idx < len - 1)) {
buff[idx++] = c;
- pc.putc(c);
+ pc.write(bf, 1);
}
}
buff[idx] = 0;
- pc.putc('\n');
+ bf[0] = '\n';
+ pc.write(bf, 1);
}
// Check key input strings and set time
@@ -242,42 +265,41 @@
if (xatoi(&ptr, &p1)) {
t.tm_year = (uint8_t)p1 + 100;
- pc.printf("Year:%d ",p1);
+ printf("Year:%d ",p1);
xatoi( &ptr, &p1 );
t.tm_mon = (uint8_t)p1 - 1;
- pc.printf("Month:%d ",p1);
+ printf("Month:%d ",p1);
xatoi( &ptr, &p1 );
t.tm_mday = (uint8_t)p1;
- pc.printf("Day:%d ",p1);
+ printf("Day:%d ",p1);
xatoi( &ptr, &p1 );
t.tm_hour = (uint8_t)p1;
- pc.printf("Hour:%d ",p1);
+ printf("Hour:%d ",p1);
xatoi( &ptr, &p1 );
t.tm_min = (uint8_t)p1;
- pc.printf("Min:%d ",p1);
+ printf("Min:%d ",p1);
xatoi( &ptr, &p1 );
t.tm_sec = (uint8_t)p1;
- pc.printf("Sec: %d \r\n",p1);
+ printf("Sec: %d \r\n",p1);
} else {
return;
}
seconds = mktime(&t);
set_time(seconds);
+ // Show Time with several example
// ex.1
- pc.printf(
+ printf(
"Date: %04d/%02d/%02d, %02d:%02d:%02d\r\n",
t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, t.tm_hour, t.tm_min, t.tm_sec
);
-#if 0
- // Show Time with several example
+ char buf[64];
// ex.2
strftime(buf, 40, "%x %X", localtime(&seconds));
- pc.printf("Date: %s\r\n", buf);
+ printf("Date: %s\r\n", buf);
// ex.3
strftime(buf, 40, "%I:%M:%S %p (%Y/%m/%d)", localtime(&seconds));
- pc.printf("Date: %s\r\n", buf);
+ printf("Date: %s\r\n", buf);
// ex.4
strftime(buf, 40, "%B %d,'%y, %H:%M:%S", localtime(&seconds));
- pc.printf("Date: %s\r\n", buf);
-#endif
+ printf("Date: %s\r\n", buf);
}