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