60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
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/* Copyright 2016 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "radio.h"
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int radio_disable(void)
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{
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int timeout = 10000;
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NRF51_RADIO_DISABLED = 0;
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NRF51_RADIO_DISABLE = 1;
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while (!NRF51_RADIO_DISABLED && timeout > 0)
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timeout--;
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if (timeout == 0)
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return EC_ERROR_TIMEOUT;
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return EC_SUCCESS;
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}
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int radio_init(enum nrf51_radio_mode_t mode)
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{
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int err_code = radio_disable();
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if (mode == BLE_1MBIT) {
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NRF51_RADIO_MODE = NRF51_RADIO_MODE_BLE_1MBIT;
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NRF51_RADIO_TIFS = 150; /* Bluetooth 4.1 Vol 6 pg 58 4.1 */
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/*
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* BLE never sends or receives two packets in a row.
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* Enabling the radio means we want to transmit or receive.
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* After transmission, disable as quickly as possible.
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*/
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NRF51_RADIO_SHORTS = NRF51_RADIO_SHORTS_READY_START |
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NRF51_RADIO_SHORTS_END_DISABLE;
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/* Use factory parameters if available */
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if (!(NRF51_FICR_OVERRIDEEN & NRF51_FICR_OVERRIDEEN_BLE_BIT_N)
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) {
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int i;
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for (i = 0; i < 4; i++) {
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NRF51_RADIO_OVERRIDE(i) =
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NRF51_FICR_BLE_1MBIT(i);
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}
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NRF51_RADIO_OVERRIDE(4) = NRF51_FICR_BLE_1MBIT(4) |
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NRF51_RADIO_OVERRIDE_EN;
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}
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} else {
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return EC_ERROR_UNIMPLEMENTED;
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}
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return err_code;
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}
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