151 lines
4.0 KiB
C
151 lines
4.0 KiB
C
/* T/C driver for performance measurements
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*
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* Copyright 2008 Henryk Plötz <henryk@ploetzli.ch>
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*
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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 2 of the License, or
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* (at your option) any later version.
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*
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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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*
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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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <FreeRTOS.h>
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#include <AT91SAM7.h>
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#include <openpicc.h>
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#include <string.h>
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#include "performance.h"
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#include "cmd.h"
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static AT91PS_TC tc_perf = AT91C_BASE_TC1;
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static u_int32_t overruns = 0;
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#define NUMBER_OF_CHECKPOINTS 20
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static struct performance_checkpoint checkpoints[NUMBER_OF_CHECKPOINTS];
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static int current_checkpoint;
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static int running=0;
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static void __ramfunc tc_perf_irq(void) __attribute__ ((naked));
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static void __ramfunc tc_perf_irq(void)
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{
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portSAVE_CONTEXT();
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u_int32_t sr = tc_perf->TC_SR;
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if(sr & AT91C_TC_COVFS) overruns++;
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AT91F_AIC_AcknowledgeIt();
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portRESTORE_CONTEXT();
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}
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void performance_init(void)
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{
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AT91F_PMC_EnablePeriphClock(AT91C_BASE_PMC, ((u_int32_t) 1 << AT91C_ID_TC1));
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/* clock is MCK/2, TIOA/B unconfigured, reset only on SWTRG, ignore Compare C */
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tc_perf->TC_CMR = AT91C_TC_CLKS_TIMER_DIV1_CLOCK;
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tc_perf->TC_CCR = AT91C_TC_CLKDIS;
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AT91F_AIC_ConfigureIt(AT91C_ID_TC1, AT91C_AIC_PRIOR_HIGHEST-1,
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AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, (THandler)&tc_perf_irq);
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tc_perf->TC_IER = AT91C_TC_COVFS;
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AT91F_AIC_ClearIt(AT91C_ID_TC1);
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AT91F_AIC_EnableIt(AT91C_ID_TC1);
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memset(checkpoints, 0, sizeof(checkpoints));
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}
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inline void performance_start(void)
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{
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memset(checkpoints, 0, sizeof(checkpoints));
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current_checkpoint = 0;
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overruns = 0;
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running = 1;
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tc_perf->TC_CCR = AT91C_TC_SWTRG | AT91C_TC_CLKEN;
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}
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inline perf_time_t performance_get(void)
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{
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u_int32_t cv = tc_perf->TC_CV;
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perf_time_t result = {
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.high = overruns,
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.low = cv,
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};
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return result;
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}
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inline perf_time_t performance_stop(void)
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{
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perf_time_t result = performance_get();
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running = 0;
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tc_perf->TC_CCR = AT91C_TC_CLKDIS;
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return result;
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}
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void performance_print(perf_time_t time)
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{
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DumpUIntToUSB(time.high);
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DumpStringToUSB(":");
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DumpUIntToUSB(time.low);
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}
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perf_time_t performance_diff(perf_time_t a, perf_time_t b)
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{
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// assert that a <= b
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if( (a.high > b.high) || (a.high == b.high && a.low > b.low) ) return performance_diff(b, a);
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perf_time_t result = { b.high - a.high, 0 };
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if(b.high == a.high) result.low = b.low - a.low;
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return result;
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}
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void performance_set_checkpoint(const char * const description)
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{
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if(!running) return;
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if(current_checkpoint < NUMBER_OF_CHECKPOINTS) {
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perf_time_t time = performance_get();
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checkpoints[current_checkpoint++] = (struct performance_checkpoint){
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.time = time,
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.description = description,
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};
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}
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}
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void performance_stop_report(void)
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{
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if(!running) return;
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perf_time_t _now = performance_stop();
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struct performance_checkpoint now = {
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.time = _now,
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.description = "end of data collection",
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};
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perf_time_t last = {0,0};
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int i;
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DumpStringToUSB("Performance report: \n\r");
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for(i = 0; i <= current_checkpoint; i++) {
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struct performance_checkpoint current = (i<current_checkpoint ? checkpoints[i] : now);
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DumpStringToUSB("\t");
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performance_print(current.time);
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DumpStringToUSB(" \t");
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if(last.high == 0 && last.low == 0)
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DumpStringToUSB(" ");
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else
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performance_print(performance_diff(last, current.time));
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last = current.time;
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DumpStringToUSB(" \t");
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if(current.description)
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DumpStringToUSB(current.description);
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DumpStringToUSB("\n\r");
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}
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}
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