mbed official / mbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Dependents:   hello SerialTestv11 SerialTestv12 Sierpinski ... more

mbed 2

This is the mbed 2 library. If you'd like to learn about Mbed OS please see the mbed-os docs.

Diff: TARGET_VBLUNO51/TOOLCHAIN_GCC_ARM/nrf_delay.h

Revision:
171:3a7713b1edbc
Parent:
169:a7c7b631e539
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TARGET_VBLUNO51/TOOLCHAIN_GCC_ARM/nrf_delay.h	Thu Nov 08 11:45:42 2018 +0000
@@ -0,0 +1,242 @@
+#ifndef _NRF_DELAY_H
+#define _NRF_DELAY_H
+
+#include "nrf.h"
+
+/**
+ * @brief Function for delaying execution for number of microseconds.
+ *
+ * @note NRF52 has instruction cache and because of that delay is not precise.
+ *
+ * @param number_of_ms
+ */
+/*lint --e{438, 522} "Variable not used" "Function lacks side-effects" */
+#if defined ( __CC_ARM   )
+
+static __ASM void __INLINE nrf_delay_us(uint32_t volatile number_of_us)
+{
+loop
+        SUBS    R0, R0, #1
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+#ifdef NRF52
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+        NOP
+#endif
+        BNE    loop
+        BX     LR
+}
+
+#elif defined ( __ICCARM__ )
+
+static void __INLINE nrf_delay_us(uint32_t volatile number_of_us)
+{
+__ASM (
+"loop:\n\t"
+       " SUBS R0, R0, #1\n\t"
+       " NOP\n\t"
+       " NOP\n\t"
+       " NOP\n\t"
+       " NOP\n\t"
+       " NOP\n\t"
+       " NOP\n\t"
+       " NOP\n\t"
+       " NOP\n\t"
+       " NOP\n\t"
+       " NOP\n\t"
+       " NOP\n\t"
+       " NOP\n\t"
+#ifdef NRF52
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+        " NOP\n\t"
+#endif
+       " BNE.n loop\n\t");
+}
+
+#elif defined ( _WIN32 ) || defined ( __unix ) || defined( __APPLE__ )
+
+__STATIC_INLINE void nrf_delay_us(uint32_t volatile number_of_us);
+
+#ifndef CUSTOM_NRF_DELAY_US
+__STATIC_INLINE void nrf_delay_us(uint32_t volatile number_of_us)
+{}
+#endif
+
+#elif defined ( __GNUC__ )
+
+static __INLINE void nrf_delay_us(uint32_t volatile number_of_us) __attribute__((always_inline));
+static __INLINE void nrf_delay_us(uint32_t volatile number_of_us)
+{
+register uint32_t delay __ASM ("r0") = number_of_us;
+__ASM volatile (
+#if defined(NRF51) && !defined(__ARMCC_VERSION)
+        ".syntax unified\n"
+#endif
+    "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"
+#ifdef NRF52
+    " NOP\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"
+    " NOP\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"
+    " NOP\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"
+    " NOP\n"
+    " NOP\n"
+    " NOP\n"
+    " NOP\n"
+    " NOP\n"
+    " NOP\n"
+    " NOP\n"
+#endif
+    " BNE 1b\n"
+#if defined(NRF51) && !defined(__ARMCC_VERSION)
+    ".syntax divided\n"
+#endif
+    : "+r" (delay));
+}
+#endif
+
+void nrf_delay_ms(uint32_t volatile number_of_ms);
+
+#endif