跑一下XMEGA-B1程序(9)RTC模块

今天跑一下RTC模块，工程还用上次的不用建了。

首先加入RTC模块。然后从ASF EXPLORER中找到快速指导，打开，上边有提示，按照提示往下进行就可以。

需要注意的是，在CLOCK.h中一定要设为32K的晶振。
#define CONFIG_SYSCLK_SOURCE SYSCLK_SRC_RC32KHZ
#define CONFIG_RTC_SOURCE SYSCLK_RTCSRC_ULP

复制

#ifndef CONF_CLOCK_H_INCLUDED

#define CONF_CLOCK_H_INCLUDED



//#define CONFIG_SYSCLK_SOURCE          SYSCLK_SRC_RC2MHZ

//#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_RC32MHZ

#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_RC32KHZ

//#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_XOSC

//#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_PLL



/* Fbus = Fsys / (2 ^ BUS_div) */

#define CONFIG_SYSCLK_PSADIV          SYSCLK_PSADIV_1

#define CONFIG_SYSCLK_PSBCDIV         SYSCLK_PSBCDIV_1_1



//#define CONFIG_PLL0_SOURCE          PLL_SRC_XOSC

//#define CONFIG_PLL0_SOURCE          PLL_SRC_RC2MHZ

//#define CONFIG_PLL0_SOURCE          PLL_SRC_RC32MHZ



/* Fpll = (Fclk * PLL_mul) / PLL_div */

//#define CONFIG_PLL0_MUL             (24000000UL / BOARD_XOSC_HZ)

//#define CONFIG_PLL0_DIV             1



/* External oscillator frequency range */

/** 0.4 to 2 MHz frequency range */

//#define CONFIG_XOSC_RANGE XOSC_RANGE_04TO2

/** 2 to 9 MHz frequency range */

//#define CONFIG_XOSC_RANGE XOSC_RANGE_2TO9

/** 9 to 12 MHz frequency range */

//#define CONFIG_XOSC_RANGE XOSC_RANGE_9TO12

/** 12 to 16 MHz frequency range */

//#define CONFIG_XOSC_RANGE XOSC_RANGE_12TO16



/* DFLL autocalibration */

//#define CONFIG_OSC_AUTOCAL_RC2MHZ_REF_OSC  OSC_ID_RC32KHZ

//#define CONFIG_OSC_AUTOCAL_RC32MHZ_REF_OSC OSC_ID_XOSC



/* The following example clock configuration definitions can be used in XMEGA

 * devices that contain a USB controller. It configures the USB controller clock

 * source to use the internal (nominally) 32MHz RC oscillator, up-calibrated to

 * run at 48MHz via the periodic 1ms USB Start Of Frame packets sent by the

 * host. The USB controller requires 48MHz for Full Speed operation, or 6MHz

 * for USB Low Speed operation.

 *

 * Note that when the 32MHz RC oscillator is tuned to 48MHz, it cannot be used

 * directly as the system clock source; it must either be prescaled down to a

 * speed below the maximum operating frequency given in the datasheet, or an

 * alternative clock source (e.g. the internal 2MHz RC Oscillator, multiplied

 * to a higher frequency via the internal PLL module) must be used instead.

 */

#define CONFIG_USBCLK_SOURCE                USBCLK_SRC_RCOSC

//#define CONFIG_OSC_RC32_CAL                 48000000UL

//#define CONFIG_OSC_AUTOCAL_RC32MHZ_REF_OSC  OSC_ID_USBSOF



/* Use to enable and select RTC clock source */

#define CONFIG_RTC_SOURCE           SYSCLK_RTCSRC_ULP



#endif /* CONF_CLOCK_H_INCLUDED */

在RTC.h中定义好：
# define CONFIG_RTC_PRESCALER RTC_PRESCALER_DIV1024_gc
那么下列小程序就可运行了：

复制

#include <asf.h>





uint32_t ddd;

int main (void)

{

        /* Insert system clock initialization code here (sysclk_init()). */



        //sysclk_init();

        

        

        sysclk_init();

        //board_init();

        rtc_init();

        

        while(1)

        {

        ddd = rtc_get_time();

        }

        

}

以下是运行截图：可以看到ddd的数在增加：

厉害~