4 * This file is part of BeRTOS.
6 * Bertos is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * As a special exception, you may use this file as part of a free software
21 * library without restriction. Specifically, if other files instantiate
22 * templates or use macros or inline functions from this file, or you compile
23 * this file and link it with other files to produce an executable, this
24 * file does not by itself cause the resulting executable to be covered by
25 * the GNU General Public License. This exception does not however
26 * invalidate any other reasons why the executable file might be covered by
27 * the GNU General Public License.
29 * Copyright 2005 Develer S.r.l. (http://www.develer.com/)
33 * \brief Test for PWM driver (implementation)
35 * This is a simple test for PWM driver. This module
36 * is target independent, so you can test all target that
38 * To use this test you should include a pwm_map.h header where
39 * are defined the PWM channels for your target. Then you should add
40 * or remove a test setting in pwm_test_cfg array, and edit a value for
42 * Afther this, all is ready and you can test PWM driver.
44 * The test check first if all PWM channel starts, and then try
45 * to change a PWM duty cicle for all channel.
46 * The change of duty cycle is operate when a PWM channel is enable,
47 * in this way you can see if a pwm signal is clean and work properly.
48 * The duty value is change incrementaly, and when it arrive to 100% or 0%,
49 * we reset the duty value and restart the test.
50 * Further the duty test, we check also a PWM polarity, infact when we
51 * reach a reset duty value, we invert a polary of PWM wavform.
52 * So you can see if the hardware manage correctly this situation.
54 * Note: To be simple and target independently we not use a timer module,
55 * and so the delay is do with a for cycle.
59 * \author Daniele Basile <asterix@develer.com>
62 #include "hw/pwm_map.h" // For PwmDev and channel avaible on thi target
63 #include "cfg/cfg_pwm.h"
65 #include <cfg/log.h> // for logging system
66 #include <cfg/macros.h>
67 #include <cfg/debug.h>
69 #include <cpu/types.h>
73 #include CPU_HEADER(pwm)
75 #define DELAY_TIME 10000 // This is a number of for cycle before to set a new value of duty
76 #define PWM_DUTY_INC 200 // Incremental value for duty
80 * Simple struct to store
83 typedef struct PwmTest
92 * Test settings for each channel.
94 * Frequency value is in Hz.
96 * Esample of value for duty cycle"
98 * - 100% => 0xFFFFFFFF
100 * - 75% => 0xBFFFFFFF
101 * - 50% => 0x7FFFFFFF
102 * - 25% => 0x3FFFFFFF
103 * - 33% => 0x55555555
104 * - 16% => 0x2AAAAAAA
106 static PwmTest pwm_test_cfg[PWM_CNT] =
108 /* Channel, polarity, frequecy, duty */
109 { 0, false, 100UL, 0 }, /* 100Hz, 0% duty */
110 { 1, false, 1000UL, 0x7FFF }, /* 1KHz, 50% duty */
111 { 2, false, 12356UL, 0x5555 }, /* 12,356KHz, 33% duty */
112 { 3, false, 100000UL, 0xCCCC } /* 100KHz, 80% duty */
116 * Setup all needed to test PWM on AT91
119 int pwm_testSetup(void)
121 LOG_INFO("Init pwm..");
130 * Test suit for genation of pwm waveform.
133 int pwm_testRun(void)
140 LOG_INFO("\n\n===== BeRTOS PWM test =====\n\n");
142 for (int i = 0; i < PWM_CNT; i++)
144 LOG_INFO("PWM test ch[%d]\n", pwm_test_cfg[i].ch);
145 LOG_INFO("--> set pol[%d]", pwm_test_cfg[i].pol);
146 LOG_INFO("\n(Note: if polarity is false the output waveform start at high level,\n see low level implentation for detail)i\n");
147 pwm_setPolarity(pwm_test_cfg[i].ch, pwm_test_cfg[i].pol);
150 LOG_INFO("--> set freq[%ld]", pwm_test_cfg[i].freq);
151 pwm_setFrequency(pwm_test_cfg[i].ch, pwm_test_cfg[i].freq);
154 LOG_INFO("--> set duty[%d]", pwm_test_cfg[i].duty);
155 pwm_setDuty(pwm_test_cfg[i].ch, pwm_test_cfg[i].duty);
158 LOG_INFO("--> Enable pwm");
159 pwm_enable(pwm_test_cfg[i].ch, true);
163 LOG_INFO("\n-------------------------- Dinamic PWM test --------------------------\n");
164 LOG_INFO("We test if driver change correctly the duty cycle durind it working.\n");
165 LOG_INFO("On your oscilloscope you should see the pwm singal that increase until\n");
166 LOG_INFO("the duty value is 100%%. After this value we invert a polarity of pwm,\n");
167 LOG_INFO("and repeat the test. But now you should see that pwm duty decreasing until\n");
168 LOG_INFO("0%% duty value.\nAfter that, we repeat the test from beginning.\n\n");
172 if (delay == DELAY_TIME)
174 for (int i = 0; i < PWM_CNT; i++)
176 LOG_INFO("PWM test ch[%d]\n", pwm_test_cfg[i].ch);
177 LOG_INFO("--> set duty[%d]", duty);
178 pwm_setDuty(pwm_test_cfg[i].ch, duty);
181 LOG_INFO("\n++++++++++++++++++++\n");
182 duty += PWM_DUTY_INC;
186 //Reset duty cycle overflow
190 for (int i = 0; i < PWM_CNT; i++)
192 LOG_INFO("Duty reset, swap polarity:\n");
193 LOG_INFO("--> pol from [%d] to [%d]", pwm_test_cfg[i].pol, !pwm_test_cfg[i].pol);
195 pwm_test_cfg[i].pol = !pwm_test_cfg[i].pol;
196 pwm_setPolarity(pwm_test_cfg[i].ch, pwm_test_cfg[i].pol);
200 LOG_INFO("\n++++++++++++++++++++\n");
212 int pwm_testTearDown(void)
221 * Look it as exmple or use it if
222 * you want test a PWM driver stand alone.