Diff: targets/TARGET_ublox/TARGET_HI2110/hi2110_init.c

Revision:

150:02e0a0aed4ec

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_ublox/TARGET_HI2110/hi2110_init.c	Tue Nov 08 17:45:16 2016 +0000
@@ -0,0 +1,69 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2016 u-blox
+ *
+ * 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 <stdint.h>
+#include <stdbool.h>
+#include "mbed_assert.h"
+#include "cmsis.h"
+#include "hi2110_init.h"
+
+/* ----------------------------------------------------------------
+ * MACROS
+ * ----------------------------------------------------------------*/
+
+/* ----------------------------------------------------------------
+ * FUNCTION PROTOTYPES
+ * ----------------------------------------------------------------*/
+
+static uint8_t get_owner(uint8_t pin);
+
+/* ----------------------------------------------------------------
+ * NON-API FUNCTIONS
+ * ----------------------------------------------------------------*/
+
+/* Determine which core owns a given pin
+ * 0: None
+ * 1: security core
+ * 2: protocol core
+ * 3: apps core */
+static uint8_t get_owner(uint8_t pin)
+{
+    uint8_t value;
+    uint8_t pio_owner_shift = (pin & 0x0F) << 1;
+    volatile uint32_t * pio_owner_reg = (&PIO_OWNER0 + (pin >> 4));
+
+    value = 0x03 & (*pio_owner_reg >> pio_owner_shift);
+
+    return value;
+}
+
+/* ----------------------------------------------------------------
+ * MBED API FUNCTIONS
+ * ----------------------------------------------------------------*/
+
+void HI2110_init(void)
+{
+    __attribute__ ((unused)) uint8_t owner[20];
+    
+    /* This purely for diagnostics to see who owns which PIO pin.
+     * Put a break-point at the end of this function and take a look
+     * at the array.
+     * Any items marked as 1 or 2 belong to the security or protocol
+     * cores.  Otherwise they are up for grabs. */
+    for (uint8_t x = 0; x < 20; x++) {
+        owner[x] = get_owner(x);
+    }
+}