Diff: source/family/nxp/lpc55S6X/target_reset.c

Revision:

0:01f31e923fe2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/family/nxp/lpc55S6X/target_reset.c	Tue Apr 07 12:55:42 2020 +0200
@@ -0,0 +1,113 @@
+/**
+ * @file    target_reset.c
+ * @brief   Target reset for the lpc812
+ *
+ * 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 "target_family.h"
+#include "swd_host.h"
+#include "cmsis_os2.h"
+
+#define DBG_Addr                (0xE000EDF0)
+#define DWT_COMP0               (0xE0001020)
+#define DWT_FUNCTION0           (0xE0001028)
+#define DWT_FUNCTION_MATCH      (0x4 << 0)
+#define DWT_FUNCTION_ACTION     (0x1 << 4)
+#define DWT_FUNCTION_DATAVSIZE  (0x2 << 10)
+
+/* Debug mailbox AP registers */
+#define DEBUGMB_CSW  0x02000000
+#define DEBUGMB_REQ  0x02000004
+#define DEBUGMB_RET  0x02000008
+#define DEBUGMB_ID   0x020000FC
+
+static uint8_t lpc55s6x_target_set_state(target_state_t state)
+{
+    uint32_t val;
+    int8_t ap_retries = 2;
+
+    if (state == RESET_PROGRAM) {
+        if (!swd_init_debug()) {
+            return 0;
+        }
+
+        // Enable debug
+        while(swd_write_word(DBG_HCSR, DBGKEY | C_DEBUGEN) == 0) {
+            if( --ap_retries <=0 )
+                return 0;
+            // Target is in invalid state?
+            swd_set_target_reset(1);
+            osDelay(2);
+            swd_set_target_reset(0);
+            osDelay(2);
+        }
+
+        // Set Trace Enable bit
+        if (!swd_read_word(DBG_EMCR, &val)) {
+            return 0;
+        }
+
+        if (!swd_write_word(DBG_EMCR, val | TRCENA)) {
+            return 0;
+        }
+
+        // Clear the comparator function register
+        if (!swd_write_word(DWT_FUNCTION0, 0x0)) {
+            return 0;
+        }
+
+        // Set the address
+        if (!swd_write_word(DWT_COMP0, 0x50000040)) {
+            return 0;
+        }
+
+        // Update the comparator function register
+        if (!swd_write_word(DWT_FUNCTION0, (DWT_FUNCTION_MATCH | DWT_FUNCTION_ACTION | DWT_FUNCTION_DATAVSIZE))) {
+            return 0;
+        }
+
+        // Reset using the debug mailbox
+        if (!swd_write_ap(DEBUGMB_CSW, 0x20)) {
+            return 0;
+        }
+
+        osDelay(5);
+
+        do {
+            if (!swd_read_word(DBG_HCSR, &val)) {
+                return 0;
+            }
+        } while ((val & S_HALT) == 0);
+
+        // Disable halt on reset
+        if (!swd_write_word(DBG_EMCR, 0)) {
+            return 0;
+        }
+
+        return 1;
+
+    } else {
+        return swd_set_target_state_sw(state);
+    }
+}
+
+const target_family_descriptor_t g_target_family_lpc55S6X = {
+    .family_id = VENDOR_TO_FAMILY(kNXP_VendorID, 0), //ID not maching the predefined family ids
+    .target_set_state = lpc55s6x_target_set_state,
+};
+
+const target_family_descriptor_t *g_target_family = &g_target_family_lpc55S6X;