AN668 查看數據表（PDF） - Silicon Laboratories

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AN668

PRECISION32™ SOFTWARE DEVELOPMENT KIT CODE

Silicon Laboratories 

AN668

5.1.4. myRtc0.c

The myRtc0.c file includes the second-level handlers for the RTC0 Alarm 0 and RTC0 oscillator fail interrupts.

These second-level handlers are called from the first-level handlers in gRtc0.c.

The second-level Alarm 0 handler:

Reads the RTC0 counter value.

Sets the RTC0 Alarm 0 value with a new value equal to the current counter value + 10 ms.

Increments msTicks_10, which keeps track of the 10 ms intervals.

Clears the Alarm 0 interrupt in the RTC0 module.

The second-level oscillator fail handler sits in a while(1) loop to indicate an unrecoverable error condition.

Figure 6 shows the dependencies for myRtc0.c.

myRtc.c

Blinky

gRtc.c

si32Hal

SI32_RTC_A_Type.c

SI32_RTC_A_Type.c

SI32_RTC_A_Type.c

Figure 7. myRtc0.c Dependencies

5.2. Blinky AppBuilder-Generated Files

5.2.1. gCpu.c

This file contains the SysTick handler, which increments the msTicks variable, and the

gCpu_enter_default_config() function, which is called from gModes_enter_my_default_mode() in gModes.c.

This function sets the SystemCoreClock variable to 20 MHz, since Blinky uses the Low Power Oscillator, and sets

the SysTick timer to trigger every millisecond.

Figure 8 shows the dependencies for gCpu.c.

gCpu.c

Blinky

gModes.c

si32Hal

core_cm3.h

Figure 8. gCpu.c Dependencies

6

Rev. 0.1

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