Add oscillator control wrappers
This commit is contained in:
George Oikonomou
parent
b50ae639b3
commit
b7e7d48f0b
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@ -81,7 +81,7 @@ CONTIKI_CPU_SOURCEFILES += clock.c rtimer-arch.c cc26xx-rtc.c uart.c
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CONTIKI_CPU_SOURCEFILES += cc26xx-rf.c contiki-watchdog.c
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CONTIKI_CPU_SOURCEFILES += putchar.c ieee-addr.c batmon-sensor.c
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CONTIKI_CPU_SOURCEFILES += slip-arch.c slip.c cc26xx-uart.c lpm.c
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CONTIKI_CPU_SOURCEFILES += gpio-interrupt.c
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CONTIKI_CPU_SOURCEFILES += gpio-interrupt.c oscillators.c
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DEBUG_IO_SOURCEFILES += dbg-printf.c dbg-snprintf.c dbg-sprintf.c strformat.c
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172
cpu/cc26xx/dev/oscillators.c
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172
cpu/cc26xx/dev/oscillators.c
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/*
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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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* @}
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* @}
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*/
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101
cpu/cc26xx/dev/oscillators.h
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101
cpu/cc26xx/dev/oscillators.h
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@ -0,0 +1,101 @@
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/*
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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
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* @{
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*
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* \defgroup cc26xx-oscillators CC26XX oscillator control
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*
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* Wrapper around those CC26xxware OSC functions that we need in Contiki.
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*
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* All CC26xxware OSC control requires access to the semaphore module within
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* AUX. Thus, in addition to enabling the oscillator interface, we need to
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* start the clock to SMPH and restore it to its previous state when we are
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* done.
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* @{
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*
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* \file
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* Header file for the CC26XX oscillator control
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*/
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/*---------------------------------------------------------------------------*/
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#ifndef OSCILLATORS_H_
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#define OSCILLATORS_H_
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Set the LF clock source to be the LF XOSC
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*
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* This function is only called once as soon as the system starts.
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*
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* Do not switch the LF clock source to the RC OSC for normal system operation
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* See CC26xx Errata (swrz058)
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*/
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void oscillators_select_lf_xosc(void);
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/**
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* \brief Set the LF clock source to be the LF RCOSC
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*
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* This function is only called once, when the systen transitions to a full
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* shutdown
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*
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* Do not switch the LF clock source to the RC OSC for normal system operation
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* See CC26xx Errata (swrz058)
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*/
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void oscillators_select_lf_rcosc(void);
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/**
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* \brief Requests the HF XOSC as the source for the HF clock, but does not
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* perform the actual switch.
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*
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* This triggers the startup sequence of the HF XOSC and returns so the CPU
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* can perform other tasks while the XOSC is starting.
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*
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* The XOSC is requested as the source for the HF as well as the MF clock.
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*/
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void oscillators_request_hf_xosc(void);
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/**
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* \brief Performs the switch to the XOSC
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*
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* This function must be preceded by a call to oscillators_request_hf_xosc()
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*/
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void oscillators_switch_to_hf_xosc(void);
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/**
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* \brief Switches MF and HF clock source to be the HF RC OSC
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*/
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void oscillators_switch_to_hf_rc(void);
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/*---------------------------------------------------------------------------*/
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#endif /* OSCILLATORS_H_ */
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/*---------------------------------------------------------------------------*/
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/**
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* @}
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* @}
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*/
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