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