78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
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/******************************************************************************
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* @brief provide generic high-level routines for ARM Cortex M0/M0+ processors.
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*
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*******************************************************************************/
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#include "common.h"
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/***********************************************************************/
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/*
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* Configures the ARM system control register for STOP (deep sleep) mode
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* and then executes the WFI instruction to enter the mode.
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*
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* Parameters:
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* none
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*
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* Note: Might want to change this later to allow for passing in a parameter
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* to optionally set the sleep on exit bit.
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*/
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void stop (void)
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{
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/* Set the SLEEPDEEP bit to enable deep sleep mode (STOP) */
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SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
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/* WFI instruction will start entry into STOP mode */
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#ifndef KEIL
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// If not using KEIL's uVision use the standard assembly command
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asm("WFI");
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#else
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// If using KEIL's uVision, use the CMSIS intrinsic
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__wfi();
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#endif
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}
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/***********************************************************************/
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/*
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* Configures the ARM system control register for WAIT (sleep) mode
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* and then executes the WFI instruction to enter the mode.
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*
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* Parameters:
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* none
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*
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* Note: Might want to change this later to allow for passing in a parameter
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* to optionally set the sleep on exit bit.
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*/
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void wait (void)
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{
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/* Clear the SLEEPDEEP bit to make sure we go into WAIT (sleep) mode instead
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* of deep sleep.
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*/
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SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
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/* WFI instruction will start entry into WAIT mode */
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#ifndef KEIL
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// If not using KEIL's uVision use the standard assembly command
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asm("WFI");
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#else
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// If using KEIL's uVision, use the CMSIS intrinsic
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__wfi();
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#endif
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}
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/***********************************************************************/
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/*
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* Change the value of the vector table offset register to the specified value.
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*
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* Parameters:
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* vtor new value to write to the VTOR
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*/
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void write_vtor (int vtor)
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{
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/* Write the VTOR with the new value */
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SCB->VTOR = vtor;
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}
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/***********************************************************************/
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