本帖最后由 ddllxxrr 于 2016-1-4 20:47 编辑
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
#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:
#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:
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