mirror of https://github.com/ARMmbed/mbed-os.git
70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2016 u-blox
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#include "mbed_assert.h"
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#include "cmsis.h"
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#include "hi2110_init.h"
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/* ----------------------------------------------------------------
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* MACROS
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* ----------------------------------------------------------------*/
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/* ----------------------------------------------------------------
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* FUNCTION PROTOTYPES
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* ----------------------------------------------------------------*/
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static uint8_t get_owner(uint8_t pin);
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/* ----------------------------------------------------------------
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* NON-API FUNCTIONS
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* ----------------------------------------------------------------*/
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/* Determine which core owns a given pin
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* 0: None
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* 1: security core
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* 2: protocol core
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* 3: apps core */
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static uint8_t get_owner(uint8_t pin)
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{
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uint8_t value;
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uint8_t pio_owner_shift = (pin & 0x0F) << 1;
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volatile uint32_t * pio_owner_reg = (&PIO_OWNER0 + (pin >> 4));
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value = 0x03 & (*pio_owner_reg >> pio_owner_shift);
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return value;
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}
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/* ----------------------------------------------------------------
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* MBED API FUNCTIONS
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* ----------------------------------------------------------------*/
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void HI2110_init(void)
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{
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__attribute__ ((unused)) uint8_t owner[20];
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/* This purely for diagnostics to see who owns which PIO pin.
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* Put a break-point at the end of this function and take a look
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* at the array.
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* Any items marked as 1 or 2 belong to the security or protocol
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* cores. Otherwise they are up for grabs. */
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for (uint8_t x = 0; x < 20; x++) {
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owner[x] = get_owner(x);
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}
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}
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