Diff: source/family/freescale/target_reset_mimxrt.c

Revision:

0:01f31e923fe2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/family/freescale/target_reset_mimxrt.c	Tue Apr 07 12:55:42 2020 +0200
@@ -0,0 +1,67 @@
+/**
+ * @file    target_reset_mimxrt.c
+ * @brief   Target reset for the i.MX RT series
+ *
+ * DAPLink Interface Firmware
+ * Copyright (c) 2009-2019, 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
+ *
+ * http://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.
+ */
+
+#include "swd_host.h"
+#include "info.h"
+#include "target_family.h"
+#include "cmsis_os2.h"
+
+static void target_before_init_debug(void)
+{
+    // This is for the hardware conflict (the EVK are not consider >2 debugger connection
+    // situation) with another external debugger(such as JLINK). Before drag&pull, issue a
+    // hardware reset to bring the platform to a known state and also force
+    // RESET pin to high state ensure a successfully access.
+    swd_set_target_reset(1);
+    osDelay(5);
+    swd_set_target_reset(0);
+    osDelay(5);
+}
+
+static void prerun_target_config(void)
+{
+    // In some case the CPU will enter "cannot debug" state (low power, SWD pin mux changed, etc.).
+    // Doing a hardware reset will clear those states (probably, depends on app). Also, if the
+    // external flash's data is not a valid bootable image, DAPLink cannot attached to target. A
+    // hardware reset will increase the chance to connect in this situation.
+    target_set_state(RESET_RUN);
+}
+
+static uint8_t validate_bin_nvic(const uint8_t *buf)
+{
+    if(buf[0] == 'F' && buf[1] == 'C' && buf[2] == 'F' && buf[3] == 'B')
+    {
+        return 1;
+    }
+    else
+    {
+        return 0;
+    }
+}
+
+const target_family_descriptor_t g_nxp_mimxrt = {
+    .family_id = kNXP_Mimxrt_FamilyID,
+    .default_reset_type = kSoftwareReset,
+    .soft_reset_type = VECTRESET,
+    .target_before_init_debug = target_before_init_debug,
+    .prerun_target_config = prerun_target_config,
+    .validate_bin_nvic = validate_bin_nvic,
+};