106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
/* hw_gptm.c */
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/*
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This file is part of the ARM-Crypto-Lib.
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Copyright (C) 2006-2010 Daniel Otte (daniel.otte@rub.de)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdint.h>
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#include "hw_regs.h"
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#include "hw_gptm.h"
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static const
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uint32_t timer_base[] = { TIMER0_BASE, TIMER1_BASE, TIMER2_BASE, TIMER3_BASE };
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uint32_t gptm_read_timer(uint8_t timerno, uint8_t b){
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if(timerno>3){
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return 0;
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}
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return HW_REG(timer_base[timerno]+(b?GPTM_TBV_OFFSET:GPTM_TAV_OFFSET));
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}
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void gptm_write_timer(uint8_t timerno, uint8_t b, uint32_t value){
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if(timerno>3){
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return;
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}
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HW_REG(timer_base[timerno]+(b?GPTM_TBV_OFFSET:GPTM_TAV_OFFSET)) = value;
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}
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void gptm_start_timer(uint8_t timerno, uint8_t b){
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if(timerno>3){
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return;
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}
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HW_REG(timer_base[timerno]+GPTM_CTL_OFFSET) |= _BV(b?GPTM_TBEN:GPTM_TAEN);
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}
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void gptm_stop_timer(uint8_t timerno, uint8_t b){
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if(timerno>3){
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return;
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}
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HW_REG(timer_base[timerno]+GPTM_CTL_OFFSET) &= ~_BV(b?GPTM_TBEN:GPTM_TAEN);
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}
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void gptm_set_timer_prescaler(uint8_t timerno, uint8_t b, uint8_t prescaler){
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if(timerno>3){
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return;
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}
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HW_REG(timer_base[timerno]+(b?GPTM_TBPR_OFFSET:GPTM_TAPR_OFFSET)) =
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prescaler;
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}
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void gptm_set_timer_loadvalue(uint8_t timerno, uint8_t b, uint32_t value){
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if(timerno>3){
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return;
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}
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HW_REG(timer_base[timerno]+(b?GPTM_TBILR_OFFSET:GPTM_TAILR_OFFSET)) =
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value;
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}
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void gptm_set_timer_mode(uint8_t timerno, uint8_t b, uint8_t mode){
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if(timerno>3){
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return;
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}
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uint32_t tmp;
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tmp = HW_REG(timer_base[timerno]+(b?GPTM_TBMR_OFFSET:GPTM_TAMR_OFFSET));
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tmp &= ~3;
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tmp |= mode;
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HW_REG(timer_base[timerno]+(b?GPTM_TBMR_OFFSET:GPTM_TAMR_OFFSET)) = tmp;
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}
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uint8_t gptm_get_timer_running(uint8_t timerno, uint8_t b){
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if(timerno>3){
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return 0;
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}
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return (HW_REG(timer_base[timerno]+GPTM_CTL_OFFSET)>>(b?GPTM_TBEN:GPTM_TAEN))&1;
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}
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void gptm_set_timer_32periodic(uint8_t timerno){
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if(timerno>3){
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return;
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}
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volatile uint8_t i;
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HW_REG(SYSCTL_BASE+RCGC1_OFFSET) |= _BV(16+timerno);
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for(i=8; i>0; --i)
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;
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gptm_stop_timer(timerno, 0);
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HW_REG(timer_base[timerno]+GPTM_CTL_OFFSET) = 0;
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gptm_set_timer_mode(timerno, 0, GPTM_MODE_PERIODIC);
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HW_REG(timer_base[timerno]+GPTM_TAMR_OFFSET) |= _BV(4);
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gptm_set_timer_loadvalue(timerno, 0, 0xffffffff);
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}
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