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238
bertos/drv/pwm_hwtest.c
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238
bertos/drv/pwm_hwtest.c
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/**
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* \file
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2005 Develer S.r.l. (http://www.develer.com/)
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* -->
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*
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*
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* \brief Test for PWM driver (implementation)
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*
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* This is a simple test for PWM driver. This module
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* is target independent, so you can test all target that
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* BeRTOS support.
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* To use this test you should include a pwm_map.h header where
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* are defined the PWM channels for your target. Then you should add
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* or remove a test setting in pwm_test_cfg array, and edit a value for
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* your specific test.
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* Afther this, all is ready and you can test PWM driver.
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*
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* The test check first if all PWM channel starts, and then try
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* to change a PWM duty cicle for all channel.
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* The change of duty cycle is operate when a PWM channel is enable,
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* in this way you can see if a pwm signal is clean and work properly.
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* The duty value is change incrementaly, and when it arrive to 100% or 0%,
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* we reset the duty value and restart the test.
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* Further the duty test, we check also a PWM polarity, infact when we
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* reach a reset duty value, we invert a polary of PWM wavform.
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* So you can see if the hardware manage correctly this situation.
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*
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* Note: To be simple and target independently we not use a timer module,
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* and so the delay is do with a for cycle.
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*
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* \author Daniele Basile <asterix@develer.com>
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*/
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#include "hw/pwm_map.h" // For PwmDev and channel avaible on thi target
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#include "cfg/cfg_pwm.h"
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#include <cfg/macros.h>
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#include <cfg/debug.h>
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// Define logging setting (for cfg/log.h module).
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#define LOG_LEVEL PWM_LOG_LEVEL
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#define LOG_FORMAT PWM_LOG_FORMAT
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#include <cfg/log.h> // for logging system
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#include <cpu/types.h>
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#include <cpu/irq.h>
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#include <drv/pwm.h>
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#include CPU_HEADER(pwm)
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#define DELAY_TIME 10000 // This is a number of for cycle before to set a new value of duty
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#define PWM_DUTY_INC 200 // Incremental value for duty
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/*
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* Simple struct to store
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* the testing value.
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*/
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typedef struct PwmTest
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{
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int ch;
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bool pol;
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pwm_freq_t freq;
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pwm_duty_t duty;
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} PwmTest;
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/*
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* Test settings for each channel.
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*
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* Frequency value is in Hz.
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*
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* Esample of value for duty cycle"
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*
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* - 100% => 0xFFFFFFFF
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* - 80% => 0xCCCCCCCC
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* - 75% => 0xBFFFFFFF
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* - 50% => 0x7FFFFFFF
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* - 25% => 0x3FFFFFFF
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* - 33% => 0x55555555
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* - 16% => 0x2AAAAAAA
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*/
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static PwmTest pwm_test_cfg[PWM_CNT] =
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{
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/* Channel, polarity, frequecy, duty */
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{ 0, false, 100UL, 0 }, /* 100Hz, 0% duty */
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{ 1, false, 1000UL, 0x7FFF }, /* 1KHz, 50% duty */
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{ 2, false, 12356UL, 0x5555 }, /* 12,356KHz, 33% duty */
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{ 3, false, 100000UL, 0xCCCC } /* 100KHz, 80% duty */
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};
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/*
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* Setup all needed to test PWM on AT91
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*
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*/
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int pwm_testSetup(void)
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{
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LOG_INFO("Init pwm..");
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pwm_init();
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LOG_INFO("done.\n");
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return 0;
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}
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/*
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* Test suit for genation of pwm waveform.
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*
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*/
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void NORETURN pwm_testRun(void)
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{
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pwm_duty_t duty = 0;
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int delay = 0;
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pwm_testSetup();
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LOG_INFO("\n\n===== BeRTOS PWM test =====\n\n");
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for (int i = 0; i < PWM_CNT; i++)
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{
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LOG_INFO("PWM test ch[%d]\n", pwm_test_cfg[i].ch);
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LOG_INFO("--> set pol[%d]", pwm_test_cfg[i].pol);
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LOG_INFO("\n(Note: if polarity is false the output waveform start at high level,\n see low level implentation for detail)i\n");
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pwm_setPolarity(pwm_test_cfg[i].ch, pwm_test_cfg[i].pol);
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LOG_INFO("..ok\n");
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LOG_INFO("--> set freq[%ld]", pwm_test_cfg[i].freq);
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pwm_setFrequency(pwm_test_cfg[i].ch, pwm_test_cfg[i].freq);
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LOG_INFO("..ok\n");
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LOG_INFO("--> set duty[%d]", pwm_test_cfg[i].duty);
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pwm_setDuty(pwm_test_cfg[i].ch, pwm_test_cfg[i].duty);
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LOG_INFO("..ok\n");
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LOG_INFO("--> Enable pwm");
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pwm_enable(pwm_test_cfg[i].ch, true);
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LOG_INFO("..ok\n");
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}
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LOG_INFO("\n-------------------------- Dinamic PWM test --------------------------\n");
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LOG_INFO("We test if driver change correctly the duty cycle durind it working.\n");
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LOG_INFO("On your oscilloscope you should see the pwm singal that increase until\n");
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LOG_INFO("the duty value is 100%%. After this value we invert a polarity of pwm,\n");
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LOG_INFO("and repeat the test. But now you should see that pwm duty decreasing until\n");
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LOG_INFO("0%% duty value.\nAfter that, we repeat the test from beginning.\n\n");
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for (;;)
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{
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if (delay == DELAY_TIME)
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{
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for (int i = 0; i < PWM_CNT; i++)
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{
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LOG_INFO("PWM test ch[%d]\n", pwm_test_cfg[i].ch);
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LOG_INFO("--> set duty[%d]", duty);
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pwm_setDuty(pwm_test_cfg[i].ch, duty);
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LOG_INFO("..ok\n");
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}
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LOG_INFO("\n++++++++++++++++++++\n");
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duty += PWM_DUTY_INC;
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delay = 0;
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}
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//Reset duty cycle overflow
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if (duty >= (pwm_duty_t)0xFFFF)
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{
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duty = 0;
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for (int i = 0; i < PWM_CNT; i++)
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{
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LOG_INFO("Duty reset, swap polarity:\n");
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LOG_INFO("--> pol from [%d] to [%d]", pwm_test_cfg[i].pol, !pwm_test_cfg[i].pol);
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pwm_test_cfg[i].pol = !pwm_test_cfg[i].pol;
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pwm_setPolarity(pwm_test_cfg[i].ch, pwm_test_cfg[i].pol);
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LOG_INFO("..ok\n");
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}
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LOG_INFO("\n++++++++++++++++++++\n");
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}
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delay++;
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}
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}
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/*
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* End a PWM Test.
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* (Unused)
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*/
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int pwm_testTearDown(void)
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{
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/* */
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return 0;
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}
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/*
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* Empty main.
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*
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* Look it as exmple or use it if
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* you want test a PWM driver stand alone.
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*/
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#if 0
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int main(void)
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{
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IRQ_ENABLE;
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kdbg_init();
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pwm_testRun();
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for(;;)
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{
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}
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}
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#endif
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