target_reset_nrf51.c

00001 /**
00002  * @file    target_reset.c
00003  * @brief   Target reset for the nrf51
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     if (asserted) {
00030         swd_init_debug();
00031 
00032         //Set POWER->RESET on NRF to 1
00033         if (!swd_write_ap(AP_TAR, 0x40000000 + 0x544)) {
00034             return;
00035         }
00036 
00037         if (!swd_write_ap(AP_DRW, 1)) {
00038             return;
00039         }
00040 
00041         //Hold RESET and SWCLK low for a minimum of 100us
00042         if(g_board_info.swd_set_target_reset){
00043             g_board_info.swd_set_target_reset(asserted);
00044         }
00045         PIN_SWCLK_TCK_CLR();
00046         PIN_SWDIO_TMS_CLR();
00047         //osDelay(1);
00048     } else {
00049         PIN_SWCLK_TCK_SET();
00050         PIN_SWDIO_TMS_SET();
00051         if(g_board_info.swd_set_target_reset){
00052             g_board_info.swd_set_target_reset(asserted);
00053         }
00054     }
00055 }
00056 
00057 const target_family_descriptor_t g_nordic_nrf51 = {
00058     .family_id  = kNordic_Nrf51_FamilyID,
00059     .default_reset_type = kSoftwareReset,
00060     .soft_reset_type = SYSRESETREQ,
00061     .swd_set_target_reset = swd_set_target_reset_nrf,
00062 };