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AN668

PRECISION32™ SOFTWARE DEVELOPMENT KIT CODE

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AN668

5.2.4. gRtc0.c

The gRtc0.c file includes the first-level interrupt handlers for the RTC0 oscillator fail (RTC0FAIL_IRQHandler())

and Alarm 0 (RTC0ALRM_IRQHandler()). These first-level interrupt handlers just call the second-level handlers

and must use the handler names defined in sim3u1xx.h, the device-specific header file.

In addition to the first-level interrupt handlers, gRtc0.c has two functions: gRtc_enter_off_config() and

gRtc0_enter_default_config().

The gRtc_enter_off_config() function disables the Alarm 0 interrupt in the RTC0 module, clears any pending

oscillator fail or Alarm 0 interrupts in the NVIC, and disables these two interrupts in the NVIC. In addition, the

function stops the RTC0 timer, disables the RTC0 module, and disables the APB clock to RTC0.

The gRtc0_enter_default_config() function:

Enables the APB clock to the RTC0 module.

Enables the RTC module and configures it for crystal oscillator mode.

Sets the initial Alarm 0 value for 10 ms.

Clears any pending interrupts and enables the interrupts in the NVIC.

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

Enables the RTC0 output.

Figure 11 shows the dependencies for gRtc0.c.

gRtc0.c

Blinky

myRtc0.c

si32Hal

SI32_CLKCTRL_A_Type.c

SI32_RTC_A_Type.c

core_cm3.h

Figure 11. gRtc0.c Dependencies

Rev. 0.1

9

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