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adds/app/rtc

Explain how to use rtc driver.

 #include <dev/spi.h>
 #include <dev/rtc.h>

 //init SPI driver requried for rtc
 //register driver in system
 if (NutRegisterDevice(&devSpi0, 0, 0)) {
 NutPrintFormat(0, "Registering spi device failed\r\n");
 } else {
 NutPrintFormat(0, "Registering spi device sucess.\r\n");
 }
 //open SPI
 devSpi = NutDeviceOpen("spi0");
 //init SPI
 (*devSpi->dev_init)(devSpi);
 
 //init RTC
 //register in system
 if (NutRegisterDevice(&devRtcSpi, 0, 0)) {
 NutPrintFormat(0, "Registering rtc device failed.\r\n");
 } else {
 NutPrintFormat(0, "Registering rtc device sucess.\r\n");
 }
 //open RTC
 devRtc = NutDeviceOpen("rtc0");
 //init RTC
 (*devRtc->dev_init)(devRtc);

 //set time
 t.tm_sec=10;
 t.tm_min=20;
 t.tm_hour=23;
 t.tm_mday=31;
 t.tm_mon=12;
 t.tm_year=2003-1900;
 setTime(&t);

 //get time from RTC and conwert it to ASCII
 NutSleep(5000);
 NutPrintFormat(0, "\r\n%s", timeToAscii(getTime()));

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