target_reset_nrf52.c

00001 /**
00002  * @file    target_reset_nrf52.c
00003  * @brief   Target reset for the nrf52
00004  *
00005  * DAPLink Interface Firmware
00006  * Copyright (c) 2009-2019, ARM Limited, All Rights Reserved
00007  * SPDX-License-Identifier: Apache-2.0
00008  *
00009  * Licensed under the Apache License, Version 2.0 (the "License"); you may
00010  * not use this file except in compliance with the License.
00011  * You may obtain a copy of the License at
00012  *
00013  * http://www.apache.org/licenses/LICENSE-2.0
00014  *
00015  * Unless required by applicable law or agreed to in writing, software
00016  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
00017  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00018  * See the License for the specific language governing permissions and
00019  * limitations under the License.
00020  */
00021 
00022 #include "swd_host.h"
00023 #include "DAP_config.h"
00024 #include "target_family.h"
00025 #include "target_board.h"
00026 
00027 static void swd_set_target_reset_nrf(uint8_t asserted)
00028 {
00029     uint32_t ap_index_return;
00030 
00031     if (asserted) {
00032         swd_init_debug();
00033 
00034         swd_read_ap(0x010000FC, &ap_index_return);
00035         if (ap_index_return == 0x02880000) {
00036             // Have CTRL-AP
00037             swd_write_ap(0x01000000, 1);  // CTRL-AP reset hold
00038         }
00039         else {
00040             // No CTRL-AP - Perform a soft reset
00041             // 0x05FA0000 = VECTKEY, 0x4 = SYSRESETREQ
00042             uint32_t swd_mem_write_data = 0x05FA0000 | 0x4;
00043             swd_write_memory(0xE000ED0C, (uint8_t *) &swd_mem_write_data, 4);
00044         }
00045         if(g_board_info.swd_set_target_reset){ //aditional reset
00046             g_board_info.swd_set_target_reset(asserted);
00047         }
00048     } else {
00049         swd_read_ap(0x010000FC, &ap_index_return);
00050         if (ap_index_return == 0x02880000) {
00051             // Device has CTRL-AP
00052             swd_write_ap(0x01000000, 0);  // CTRL-AP reset release
00053         }
00054         else {
00055             // No CTRL-AP - Soft reset has been performed
00056         }
00057         if(g_board_info.swd_set_target_reset){
00058             g_board_info.swd_set_target_reset(asserted);
00059         }
00060     }
00061 }
00062 
00063 const target_family_descriptor_t g_nordic_nrf52 = {
00064     .family_id  = kNordic_Nrf52_FamilyID,
00065     .default_reset_type = kSoftwareReset,
00066     .soft_reset_type = SYSRESETREQ,
00067     .swd_set_target_reset = swd_set_target_reset_nrf,
00068 };