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
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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.
58 * \author Daniele Basile <asterix@develer.com>
61 #include "hw/pwm_map.h" // For PwmDev and channel avaible on thi target
62 #include "cfg/cfg_pwm.h"
63 #include <cfg/macros.h>
64 #include <cfg/debug.h>
66 // Define logging setting (for cfg/log.h module).
67 #define LOG_LEVEL PWM_LOG_LEVEL
68 #define LOG_FORMAT PWM_LOG_FORMAT
69 #include <cfg/log.h> // for logging system
71 #include <cpu/types.h>
75 #include CPU_HEADER(pwm)
77 #define DELAY_TIME 10000 // This is a number of for cycle before to set a new value of duty
78 #define PWM_DUTY_INC 200 // Incremental value for duty
82 * Simple struct to store
85 typedef struct PwmTest
94 * Test settings for each channel.
96 * Frequency value is in Hz.
98 * Esample of value for duty cycle"
100 * - 100% => 0xFFFFFFFF
101 * - 80% => 0xCCCCCCCC
102 * - 75% => 0xBFFFFFFF
103 * - 50% => 0x7FFFFFFF
104 * - 25% => 0x3FFFFFFF
105 * - 33% => 0x55555555
106 * - 16% => 0x2AAAAAAA
108 static PwmTest pwm_test_cfg[PWM_CNT] =
110 /* Channel, polarity, frequecy, duty */
111 { 0, false, 100UL, 0 }, /* 100Hz, 0% duty */
112 { 1, false, 1000UL, 0x7FFF }, /* 1KHz, 50% duty */
113 { 2, false, 12356UL, 0x5555 }, /* 12,356KHz, 33% duty */
114 { 3, false, 100000UL, 0xCCCC } /* 100KHz, 80% duty */
118 * Setup all needed to test PWM on AT91
121 int pwm_testSetup(void)
123 LOG_INFO("Init pwm..");
132 * Test suit for genation of pwm waveform.
135 void NORETURN pwm_testRun(void)
142 LOG_INFO("\n\n===== BeRTOS PWM test =====\n\n");
144 for (int i = 0; i < PWM_CNT; i++)
146 LOG_INFO("PWM test ch[%d]\n", pwm_test_cfg[i].ch);
147 LOG_INFO("--> set pol[%d]", pwm_test_cfg[i].pol);
148 LOG_INFO("\n(Note: if polarity is false the output waveform start at high level,\n see low level implentation for detail)i\n");
149 pwm_setPolarity(pwm_test_cfg[i].ch, pwm_test_cfg[i].pol);
152 LOG_INFO("--> set freq[%ld]", pwm_test_cfg[i].freq);
153 pwm_setFrequency(pwm_test_cfg[i].ch, pwm_test_cfg[i].freq);
156 LOG_INFO("--> set duty[%d]", pwm_test_cfg[i].duty);
157 pwm_setDuty(pwm_test_cfg[i].ch, pwm_test_cfg[i].duty);
160 LOG_INFO("--> Enable pwm");
161 pwm_enable(pwm_test_cfg[i].ch, true);
165 LOG_INFO("\n-------------------------- Dinamic PWM test --------------------------\n");
166 LOG_INFO("We test if driver change correctly the duty cycle durind it working.\n");
167 LOG_INFO("On your oscilloscope you should see the pwm singal that increase until\n");
168 LOG_INFO("the duty value is 100%%. After this value we invert a polarity of pwm,\n");
169 LOG_INFO("and repeat the test. But now you should see that pwm duty decreasing until\n");
170 LOG_INFO("0%% duty value.\nAfter that, we repeat the test from beginning.\n\n");
174 if (delay == DELAY_TIME)
176 for (int i = 0; i < PWM_CNT; i++)
178 LOG_INFO("PWM test ch[%d]\n", pwm_test_cfg[i].ch);
179 LOG_INFO("--> set duty[%d]", duty);
180 pwm_setDuty(pwm_test_cfg[i].ch, duty);
183 LOG_INFO("\n++++++++++++++++++++\n");
184 duty += PWM_DUTY_INC;
188 //Reset duty cycle overflow
189 if (duty >= (pwm_duty_t)0xFFFF)
192 for (int i = 0; i < PWM_CNT; i++)
194 LOG_INFO("Duty reset, swap polarity:\n");
195 LOG_INFO("--> pol from [%d] to [%d]", pwm_test_cfg[i].pol, !pwm_test_cfg[i].pol);
197 pwm_test_cfg[i].pol = !pwm_test_cfg[i].pol;
198 pwm_setPolarity(pwm_test_cfg[i].ch, pwm_test_cfg[i].pol);
202 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.