Diff: source/board/microbit.c

Revision:

0:01f31e923fe2

diff -r 000000000000 -r 01f31e923fe2 source/board/microbit.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/board/microbit.c	Tue Apr 07 12:55:42 2020 +0200
@@ -0,0 +1,89 @@
+/**
+ * @file    microbit.c
+ * @brief   board ID for the BBC Microbit board
+ *
+ * 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 "fsl_device_registers.h"
+#include "IO_Config.h"
+#include "DAP.h"
+#include "target_family.h"
+#include "target_board.h"
+
+const char * const board_id_mb_1_3 = "9900";
+const char * const board_id_mb_1_5 = "9901";
+
+typedef enum {
+    BOARD_VERSION_1_3 = 0,
+    BOARD_VERSION_1_5 = 1,
+} mb_version_t;
+
+// Enables Board Type Pin, reads it and disables it
+// Depends on gpio_init() to have been executed already
+static uint8_t read_board_type_pin(void) {
+    uint8_t pin_state = 0;
+    // GPIO mode, Pull enable, pull down, input
+    PIN_BOARD_TYPE_PORT->PCR[PIN_BOARD_TYPE_BIT] = PORT_PCR_MUX(1) | PORT_PCR_PE(1) | PORT_PCR_PS(0);
+    PIN_BOARD_TYPE_GPIO->PDDR &= ~PIN_BOARD_TYPE;
+    // Wait to stabilise, based on gpio.c busy_wait(), at -O2 10000 iterations delay ~850us
+    for (volatile uint32_t i = 10000; i > 0; i--);
+    // Read pin
+    pin_state = (PIN_BOARD_TYPE_GPIO->PDIR & PIN_BOARD_TYPE);
+    // Revert and disable
+    PIN_BOARD_TYPE_PORT->PCR[PIN_BOARD_TYPE_BIT] = PORT_PCR_MUX(0) | PORT_PCR_PE(0);
+    return pin_state;
+}
+
+static void set_board_id(mb_version_t board_version) {
+    switch (board_version) {
+        case BOARD_VERSION_1_3:
+            target_device.rt_board_id = board_id_mb_1_3;
+            break;
+        case BOARD_VERSION_1_5:
+            target_device.rt_board_id = board_id_mb_1_5;
+            break;
+        default:
+            target_device.rt_board_id = board_id_mb_1_5;
+            break;
+    }
+}
+
+// Called in main_task() to init before USB and files are configured
+static void prerun_board_config(void) {
+    // With only two boards the digital pin read maps directly to the type
+    mb_version_t board_version = (mb_version_t)read_board_type_pin();
+    set_board_id(board_version);
+}
+
+// USB HID override function return 1 if the activity is trivial or response is null 
+uint8_t usbd_hid_no_activity(uint8_t *buf)
+{
+    if(buf[0] == ID_DAP_Vendor3 &&  buf[1] == 0)
+        return 1;
+    else
+        return 0;
+}
+
+const board_info_t g_board_info = {
+    .info_version = kBoardInfoVersion,
+    .family_id = kNordic_Nrf51_FamilyID,
+    .daplink_url_name =       "MICROBITHTM",
+    .daplink_drive_name =       "MICROBIT   ",
+    .daplink_target_url = "https://microbit.org/device/?id=@B&v=@V",
+    .prerun_board_config = prerun_board_config,
+    .target_cfg = &target_device,
+};