初始版本

2025-08-19 09:49:41 +08:00
parent 10f1ddf1c1
commit 6df0f7d96e
2974 changed files with 1712873 additions and 54 deletions
--- a/modules/nrfx/mdk/system_nrf51.c
+++ b/modules/nrfx/mdk/system_nrf51.c
@@ -0,0 +1,89 @@
+/*
+
+Copyright (c) 2009-2020 ARM Limited. All rights reserved.
+
+    SPDX-License-Identifier: Apache-2.0
+
+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
+
+    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.
+
+NOTICE: This file has been modified by Nordic Semiconductor ASA.
+
+*/
+
+/* 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 "nrf_erratas.h"
+#include "system_nrf51.h"
+
+/*lint ++flb "Enter library region" */
+
+
+#define __SYSTEM_CLOCK      (16000000UL)     /*!< nRF51 devices use a fixed System Clock Frequency of 16MHz */
+
+#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://infocenter.nordicsemi.com/index.jsp 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 (nrf51_errata_26())
+    {
+        *(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 for your device found at
+       https://infocenter.nordicsemi.com/index.jsp There is no side effect of using these instruction if not needed. */
+    if (nrf51_errata_59())
+    {
+        NRF_MPU->DISABLEINDEBUG = MPU_DISABLEINDEBUG_DISABLEINDEBUG_Disabled << MPU_DISABLEINDEBUG_DISABLEINDEBUG_Pos;
+    }
+
+    /* Execute the following code to eliminate excessive current in sleep mode with RAM retention in nRF51802 devices,
+       as indicated by PAN 76 "System: Excessive current in sleep mode with retention" found at Product Anomaly document
+       for your device found at https://infocenter.nordicsemi.com/index.jsp */
+    if (nrf51_errata_76()){
+        if (*(uint32_t volatile *)0x4006EC00 != 1){
+            *(uint32_t volatile *)0x4006EC00 = 0x9375;
+            while (*(uint32_t volatile *)0x4006EC00 != 1){
+            }
+        }
+        *(uint32_t volatile *)0x4006EC14 = 0xC0;
+    }
+
+    SystemCoreClockUpdate();
+}
+
+/*lint --flb "Leave library region" */