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| author | sprhawk <hongbo@yang.me> | 2014-08-29 01:48:19 +0800 |
|---|---|---|
| committer | sprhawk <hongbo@yang.me> | 2014-08-29 01:48:19 +0800 |
| commit | 214951cc8d485e826ec52a381b8e50f0e75aafa1 (patch) | |
| tree | e86687a76367eae29bd6fe1328a12eea937d7054 /system_nrf51.c | |
| download | nrf51822-posix-build-scripts-214951cc8d485e826ec52a381b8e50f0e75aafa1.tar.gz nrf51822-posix-build-scripts-214951cc8d485e826ec52a381b8e50f0e75aafa1.tar.bz2 nrf51822-posix-build-scripts-214951cc8d485e826ec52a381b8e50f0e75aafa1.tar.xz nrf51822-posix-build-scripts-214951cc8d485e826ec52a381b8e50f0e75aafa1.zip | |
modified from nordic nRF51 SDK
Diffstat (limited to 'system_nrf51.c')
| -rw-r--r-- | system_nrf51.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/system_nrf51.c b/system_nrf51.c new file mode 100644 index 0000000..a3f1d4e --- /dev/null +++ b/system_nrf51.c @@ -0,0 +1,121 @@ +/* Copyright (c) 2013, Nordic Semiconductor ASA
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * * Neither the name of Nordic Semiconductor ASA nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+/* NOTE: Template files (including this one) are application specific and therefore expected to
+ be copied into the application project folder prior to its use! */
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "nrf.h"
+#include "system_nrf51.h"
+
+/*lint ++flb "Enter library region" */
+
+
+#define __SYSTEM_CLOCK (16000000UL) /*!< nRF51 devices use a fixed System Clock Frequency of 16MHz */
+
+static bool is_manual_peripheral_setup_needed(void);
+static bool is_disabled_in_debug_needed(void);
+
+
+#if defined ( __CC_ARM )
+ uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK;
+#elif defined ( __ICCARM__ )
+ __root uint32_t SystemCoreClock = __SYSTEM_CLOCK;
+#elif defined ( __GNUC__ )
+ uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK;
+#endif
+
+void SystemCoreClockUpdate(void)
+{
+ SystemCoreClock = __SYSTEM_CLOCK;
+}
+
+void SystemInit(void)
+{
+ /* If desired, switch off the unused RAM to lower consumption by the use of RAMON register.
+ It can also be done in the application main() function. */
+
+ /* Prepare the peripherals for use as indicated by the PAN 26 "System: Manual setup is required
+ to enable the use of peripherals" found at Product Anomaly document for your device found at
+ https://www.nordicsemi.com/. The side effect of executing these instructions in the devices
+ that do not need it is that the new peripherals in the second generation devices (LPCOMP for
+ example) will not be available. */
+ if (is_manual_peripheral_setup_needed())
+ {
+ *(uint32_t volatile *)0x40000504 = 0xC007FFDF;
+ *(uint32_t volatile *)0x40006C18 = 0x00008000;
+ }
+
+ /* Disable PROTENSET registers under debug, as indicated by PAN 59 "MPU: Reset value of DISABLEINDEBUG
+ register is incorrect" found at Product Anomaly document four your device found at
+ https://www.nordicsemi.com/. There is no side effect of using these instruction if not needed. */
+ if (is_disabled_in_debug_needed())
+ {
+ NRF_MPU->DISABLEINDEBUG = MPU_DISABLEINDEBUG_DISABLEINDEBUG_Disabled << MPU_DISABLEINDEBUG_DISABLEINDEBUG_Pos;
+ }
+}
+
+
+static bool is_manual_peripheral_setup_needed(void)
+{
+ if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0))
+ {
+ if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x00) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
+ {
+ return true;
+ }
+ if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x10) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
+ {
+ return true;
+ }
+ if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x30) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
+ {
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static bool is_disabled_in_debug_needed(void)
+{
+ if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0))
+ {
+ if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x40) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
+ {
+ return true;
+ }
+ }
+
+ return false;
+}
+
+/*lint --flb "Leave library region" */
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