170 lines
6.5 KiB
C
170 lines
6.5 KiB
C
/*
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* Copyright (c) 2015, Texas Instruments Incorporated - http://www.ti.com/
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \addtogroup cc26xx-oscillators
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* @{
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*
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* \file
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* Implementation of CC26xxware oscillator control wrappers.
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*/
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/*---------------------------------------------------------------------------*/
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#include "ti-lib.h"
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#include <stdint.h>
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/*---------------------------------------------------------------------------*/
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static uint32_t
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osc_interface_en(void)
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{
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uint32_t smph_clk_state;
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/* Enable OSC DIG interface to change clock sources */
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ti_lib_osc_interface_enable();
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/* Save the state of the SMPH clock within AUX */
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smph_clk_state = ti_lib_aux_wuc_clock_status(AUX_WUC_SMPH_CLOCK);
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/* Make sure the SMPH clock within AUX is enabled */
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ti_lib_aux_wuc_clock_enable(AUX_WUC_SMPH_CLOCK);
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while(ti_lib_aux_wuc_clock_status(AUX_WUC_SMPH_CLOCK) != AUX_WUC_CLOCK_READY);
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return smph_clk_state;
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}
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/*---------------------------------------------------------------------------*/
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static void
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osc_interface_dis(uint32_t smph_clk_state)
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{
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/* If the SMPH clock was off, turn it back off */
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if(smph_clk_state == AUX_WUC_CLOCK_OFF) {
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ti_lib_aux_wuc_clock_disable(AUX_WUC_SMPH_CLOCK);
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}
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/* Disable OSC DIG interface */
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ti_lib_osc_interface_disable();
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}
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/*---------------------------------------------------------------------------*/
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void
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oscillators_select_lf_xosc(void)
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{
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/* Enable the Osc interface and remember the state of the SMPH clock */
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uint32_t smph_clk_state = osc_interface_en();
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/* Switch LF clock source to the LF XOSC if required */
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if(ti_lib_osc_clock_source_get(OSC_SRC_CLK_LF) != OSC_XOSC_LF) {
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ti_lib_osc_clock_source_set(OSC_SRC_CLK_LF, OSC_XOSC_LF);
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/* Wait for LF clock source to become XOSC_LF */
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while(ti_lib_osc_clock_source_get(OSC_SRC_CLK_LF) != OSC_XOSC_LF);
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/* Disable the LF clock qualifiers */
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ti_lib_ddi_16_bit_field_write(AUX_DDI0_OSC_BASE, DDI_0_OSC_O_CTL0,
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DDI_0_OSC_CTL0_BYPASS_XOSC_LF_CLK_QUAL_M |
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DDI_0_OSC_CTL0_BYPASS_RCOSC_LF_CLK_QUAL_M,
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DDI_0_OSC_CTL0_BYPASS_RCOSC_LF_CLK_QUAL_S,
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0x3);
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}
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/* Restore the SMPH clock and disable the OSC interface */
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osc_interface_dis(smph_clk_state);
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}
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/*---------------------------------------------------------------------------*/
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void
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oscillators_select_lf_rcosc(void)
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{
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/* Enable the Osc interface and remember the state of the SMPH clock */
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uint32_t smph_clk_state = osc_interface_en();
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/* Switch LF clock source to the LF XOSC if required */
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if(ti_lib_osc_clock_source_get(OSC_SRC_CLK_LF) != OSC_RCOSC_LF) {
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ti_lib_osc_clock_source_set(OSC_SRC_CLK_LF, OSC_RCOSC_LF);
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/* Wait for LF clock source to become XOSC_LF */
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while(ti_lib_osc_clock_source_get(OSC_SRC_CLK_LF) != OSC_RCOSC_LF);
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}
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/* Restore the SMPH clock and disable the OSC interface */
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osc_interface_dis(smph_clk_state);
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}
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/*---------------------------------------------------------------------------*/
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void
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oscillators_request_hf_xosc(void)
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{
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/* Enable the Osc interface and remember the state of the SMPH clock */
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uint32_t smph_clk_state = osc_interface_en();
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if(ti_lib_osc_clock_source_get(OSC_SRC_CLK_HF) != OSC_XOSC_HF) {
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/*
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* Request to switch to the crystal to enable radio operation. It takes a
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* while for the XTAL to be ready so instead of performing the actual
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* switch, we return and we do other stuff while the XOSC is getting ready.
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*/
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ti_lib_osc_clock_source_set(OSC_SRC_CLK_MF | OSC_SRC_CLK_HF, OSC_XOSC_HF);
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}
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/* Restore the SMPH clock and disable the OSC interface */
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osc_interface_dis(smph_clk_state);
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}
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/*---------------------------------------------------------------------------*/
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void
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oscillators_switch_to_hf_xosc(void)
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{
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/* Enable the Osc interface and remember the state of the SMPH clock */
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uint32_t smph_clk_state = osc_interface_en();
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if(ti_lib_osc_clock_source_get(OSC_SRC_CLK_HF) != OSC_XOSC_HF) {
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/* Switch the HF clock source (cc26xxware executes this from ROM) */
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ti_lib_osc_hf_source_switch();
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}
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/* Restore the SMPH clock and disable the OSC interface */
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osc_interface_dis(smph_clk_state);
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}
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/*---------------------------------------------------------------------------*/
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void
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oscillators_switch_to_hf_rc(void)
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{
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/* Enable the Osc interface and remember the state of the SMPH clock */
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uint32_t smph_clk_state = osc_interface_en();
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/* Set all clock sources to the HF RC Osc */
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ti_lib_osc_clock_source_set(OSC_SRC_CLK_MF | OSC_SRC_CLK_HF, OSC_RCOSC_HF);
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/* Check to not enable HF RC oscillator if already enabled */
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if(ti_lib_osc_clock_source_get(OSC_SRC_CLK_HF) != OSC_RCOSC_HF) {
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/* Switch the HF clock source (cc26xxware executes this from ROM) */
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ti_lib_osc_hf_source_switch();
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}
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/* Restore the SMPH clock and disable the OSC interface */
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osc_interface_dis(smph_clk_state);
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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