243 lines
4.1 KiB
C
243 lines
4.1 KiB
C
#ifndef _NRF_DELAY_H
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#define _NRF_DELAY_H
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#include "nrf.h"
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/**
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* @brief Function for delaying execution for number of microseconds.
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*
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* @note NRF52 has instruction cache and because of that delay is not precise.
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*
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* @param number_of_ms
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*/
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/*lint --e{438, 522} "Variable not used" "Function lacks side-effects" */
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#if defined ( __CC_ARM )
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static __ASM void __INLINE nrf_delay_us(uint32_t volatile number_of_us)
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{
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loop
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SUBS R0, R0, #1
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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#ifdef NRF52
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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NOP
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#endif
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BNE loop
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BX LR
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}
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#elif defined ( __ICCARM__ )
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static void __INLINE nrf_delay_us(uint32_t volatile number_of_us)
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{
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__ASM (
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"loop:\n\t"
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" SUBS R0, R0, #1\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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#ifdef NRF52
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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" NOP\n\t"
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#endif
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" BNE.n loop\n\t");
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}
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#elif defined ( _WIN32 ) /*|| defined ( __unix )*/ || defined( __APPLE__ )
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__STATIC_INLINE void nrf_delay_us(uint32_t volatile number_of_us);
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#ifndef CUSTOM_NRF_DELAY_US
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__STATIC_INLINE void nrf_delay_us(uint32_t volatile number_of_us)
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{}
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#endif
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#elif defined ( __GNUC__ )
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static void __INLINE nrf_delay_us(uint32_t volatile number_of_us) __attribute__((always_inline));
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static void __INLINE nrf_delay_us(uint32_t volatile number_of_us)
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{
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register uint32_t delay __ASM ("r0") = number_of_us;
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__ASM volatile (
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#ifdef NRF51
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".syntax unified\n"
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#endif
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"1:\n"
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" SUBS %0, %0, #1\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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#ifdef NRF52
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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" NOP\n"
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#endif
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" BNE 1b\n"
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#ifdef NRF51
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".syntax divided\n"
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#endif
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: "+r" (delay));
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}
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#endif
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void nrf_delay_ms(uint32_t volatile number_of_ms);
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#endif
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