diff options
Diffstat (limited to 'os/hal/ports/NRF51/NRF51822/nrf51_delay.h')
-rw-r--r-- | os/hal/ports/NRF51/NRF51822/nrf51_delay.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/os/hal/ports/NRF51/NRF51822/nrf51_delay.h b/os/hal/ports/NRF51/NRF51822/nrf51_delay.h new file mode 100644 index 0000000..2a672db --- /dev/null +++ b/os/hal/ports/NRF51/NRF51822/nrf51_delay.h @@ -0,0 +1,51 @@ +/* + Copyright (C) 2015 Stephen Caudle + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. +*/ + +/** + * @file NRF51822/nrf51_delay.h + * @brief NRF51822 Delay routines + * + * @{ + */ + +#ifndef _NRF_DELAY_H +#define _NRF_DELAY_H + +inline static void nrf_delay_us(uint32_t volatile number_of_us) __attribute__((always_inline)); +inline static void nrf_delay_us(uint32_t volatile number_of_us) +{ +register uint32_t delay asm ("r0") = number_of_us; +__asm volatile ( +".syntax unified\n" + "1:\n" + " SUBS %0, %0, #1\n" + " NOP\n" + " NOP\n" + " NOP\n" + " NOP\n" + " NOP\n" + " NOP\n" + " NOP\n" + " NOP\n" + " NOP\n" + " NOP\n" + " NOP\n" + " NOP\n" + " BNE 1b\n" + ".syntax divided\n" + : "+r" (delay)); +} +#endif //__NRF_DELAY_H |