mirror of https://github.com/ARMmbed/mbed-os.git
135 lines
4.3 KiB
C
135 lines
4.3 KiB
C
/*******************************************************************************
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* Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name of Maxim Integrated
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* Products, Inc. shall not be used except as stated in the Maxim Integrated
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* Products, Inc. Branding Policy.
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*
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* The mere transfer of this software does not imply any licenses
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* of trade secrets, proprietary technology, copyrights, patents,
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* trademarks, maskwork rights, or any other form of intellectual
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* property whatsoever. Maxim Integrated Products, Inc. retains all
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* ownership rights.
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*
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* $Date: 2016-03-11 11:46:37 -0600 (Fri, 11 Mar 2016) $
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* $Revision: 21839 $
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*
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******************************************************************************/
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#include <stddef.h>
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#include "pt.h"
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/******************************************************************************/
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void PT_Init(sys_pt_clk_scale clk_scale)
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{
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//disable all pulse trains
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MXC_PTG->enable = 0;
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//clear all interrupts
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MXC_PTG->intfl = MXC_PTG->intfl;
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SYS_PT_Init(clk_scale);
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}
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/******************************************************************************/
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int PT_PTConfig(mxc_pt_regs_t *pt, pt_pt_cfg_t *cfg, const sys_cfg_pt_t *sysCfg)
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{
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int err;
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uint32_t ptClock;
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uint32_t rate;
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//check for valid base pointer
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MXC_ASSERT(MXC_PT_GET_IDX(pt) >= 0);
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if(cfg == NULL)
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return E_NULL_PTR;
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if(cfg->bps == 0)
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return E_BAD_PARAM;
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//disable pulse train
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PT_Stop(pt);
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//setup system GPIO configuration
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if((err = SYS_PT_Config(pt, sysCfg)) != E_NO_ERROR)
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return err;
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//get PT clock frequency from SYS level
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ptClock = SYS_PT_GetFreq();
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if(ptClock == 0)
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return E_UNINITIALIZED;
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if(ptClock < (cfg->bps))
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return E_BAD_STATE;
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rate = (ptClock / (cfg->bps));
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pt->rate_length = ((rate << MXC_F_PT_RATE_LENGTH_RATE_CONTROL_POS)
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& MXC_F_PT_RATE_LENGTH_RATE_CONTROL) |
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((cfg->ptLength << MXC_F_PT_RATE_LENGTH_MODE_POS)
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& MXC_F_PT_RATE_LENGTH_MODE);
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pt->train = cfg->pattern;
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pt->loop = ((cfg->loop << MXC_F_PT_LOOP_COUNT_POS) & MXC_F_PT_LOOP_COUNT) |
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((cfg->loopDelay << MXC_F_PT_LOOP_DELAY_POS) & MXC_F_PT_LOOP_DELAY);
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return E_NO_ERROR;
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}
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/******************************************************************************/
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int PT_SqrWaveConfig(mxc_pt_regs_t *pt, uint32_t freq, const sys_cfg_pt_t *sysCfg)
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{
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int err;
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uint32_t ptClock;
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uint32_t rate;
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//check for valid base pointer
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MXC_ASSERT(MXC_PT_GET_IDX(pt) >= 0);
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if(freq == 0)
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return E_BAD_PARAM;
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//disable pulse train
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PT_Stop(pt);
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//setup system GPIO configuration
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if((err = SYS_PT_Config(pt, sysCfg)) != E_NO_ERROR)
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return err;
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//get PT clock frequency from SYS level
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ptClock = SYS_PT_GetFreq();
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if(ptClock == 0)
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return E_UNINITIALIZED;
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if(ptClock < (2*freq))
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return E_BAD_STATE;
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rate = (ptClock / (2*freq)) + 1;
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pt->rate_length = ((rate << MXC_F_PT_RATE_LENGTH_RATE_CONTROL_POS)
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& MXC_F_PT_RATE_LENGTH_RATE_CONTROL) |
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(MXC_V_PT_RATE_LENGTH_MODE_SQUARE_WAVE << MXC_F_PT_RATE_LENGTH_MODE_POS);
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return E_NO_ERROR;
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}
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