/* ---------------------------------------------------------------------------- | |
* ATMEL Microcontroller Software Support | |
* ---------------------------------------------------------------------------- | |
* Copyright (c) 2008, Atmel Corporation | |
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*/ | |
//------------------------------------------------------------------------------ | |
// Headers | |
//------------------------------------------------------------------------------ | |
#include "systick.h" | |
//------------------------------------------------------------------------------ | |
/// Configures the SysTick in . | |
/// \param countEnable Enable SysTick counting. | |
/// \param reloadValue Value used for tick counter to reload. | |
/// \param handler Interrupt handler function, 0 to disable interrupt. | |
//------------------------------------------------------------------------------ | |
void SysTick_Configure(unsigned char countEnable, | |
unsigned int reloadValue, | |
void( *handler )( void )) | |
{ | |
unsigned int intEnable = handler ? AT91C_NVIC_STICKINT : 0; | |
// Disable the SysTick & using core source | |
AT91C_BASE_NVIC->NVIC_STICKCSR = AT91C_NVIC_STICKCLKSOURCE; | |
// Reset the current value | |
AT91C_BASE_NVIC->NVIC_STICKCVR &= ~AT91C_NVIC_STICKCURRENT; | |
// Setup the reload value | |
AT91C_BASE_NVIC->NVIC_STICKRVR = reloadValue; | |
// Enable the SysTick | |
AT91C_BASE_NVIC->NVIC_STICKCSR = AT91C_NVIC_STICKCLKSOURCE | |
| AT91C_NVIC_STICKENABLE | |
| intEnable; | |
} | |