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soc: arm: nordic: provide custom busy_wait implementations

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Implementation taken from Nordic nrfx version 1.3.1 soc/nrfx_coredep.h,
modified to remove material from other series and to conform to Zephyr
coding standards.

Note that unlike standard k_busy_wait this is susceptible to
longer-than-intended delays due to the impact of interrupt handling.

Fixes #11626

Signed-off-by: Peter A. Bigot <pab@pabigot.com>
This commit is contained in:
Peter A. Bigot 2018-11-23 10:40:29 -06:00 • committed by Carles Cufí
commit d4b4b99272
4 changed files with 27 additions and 0 deletions
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3
soc/arm/nordic_nrf/nrf51/Kconfig.defconfig.series
View file

@ -20,6 +20,9 @@ config SYS_CLOCK_HW_CYCLES_PER_SEC
config SYS_POWER_MANAGEMENT
default y
config ARCH_HAS_CUSTOM_BUSY_WAIT
default y
config NUM_IRQS
int
default 26

14
soc/arm/nordic_nrf/nrf51/soc.c
View file

@ -15,6 +15,8 @@
#include <kernel.h>
#include <init.h>
#include <nrfx.h>
#include <soc/nrfx_coredep.h>
#ifdef CONFIG_RUNTIME_NMI
extern void _NmiInit(void);
@ -48,4 +50,16 @@ static int nordicsemi_nrf51_init(struct device *arg)
return 0;
}
#define DELAY_CALL_OVERHEAD_US 2
void z_arch_busy_wait(u32_t time_us)
{
if (time_us <= DELAY_CALL_OVERHEAD_US) {
return;
}
time_us -= DELAY_CALL_OVERHEAD_US;
nrfx_coredep_delay_us(time_us);
}
SYS_INIT(nordicsemi_nrf51_init, PRE_KERNEL_1, 0);

3
soc/arm/nordic_nrf/nrf52/Kconfig.defconfig.series
View file

@ -16,6 +16,9 @@ config SYS_CLOCK_HW_CYCLES_PER_SEC
int
default 32768
config ARCH_HAS_CUSTOM_BUSY_WAIT
default y
config SYS_POWER_MANAGEMENT
default y

7
soc/arm/nordic_nrf/nrf52/soc.c
View file

@ -15,6 +15,8 @@
#include <kernel.h>
#include <init.h>
#include <cortex_m/exc.h>
#include <nrfx.h>
#include <soc/nrfx_coredep.h>
#ifdef CONFIG_RUNTIME_NMI
extern void _NmiInit(void);
@ -71,4 +73,9 @@ static int nordicsemi_nrf52_init(struct device *arg)
return 0;
}
void z_arch_busy_wait(u32_t time_us)
{
nrfx_coredep_delay_us(time_us);
}
SYS_INIT(nordicsemi_nrf52_init, PRE_KERNEL_1, 0);