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[/] [neorv32/] [trunk/] [sw/] [example/] [demo_pwm/] [main.c] - Blame information for rev 60

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// #################################################################################################
// # << NEORV32 - PWM Demo Program >>                                                              #
// # ********************************************************************************************* #
// # BSD 3-Clause License                                                                          #
// #                                                                                               #
// # Copyright (c) 2021, Stephan Nolting. All rights reserved.                                     #
// #                                                                                               #
// # Redistribution and use in source and binary forms, with or without modification, are          #
// # permitted provided that the following conditions are met:                                     #
// #                                                                                               #
// # 1. Redistributions of source code must retain the above copyright notice, this list of        #
// #    conditions and the following disclaimer.                                                   #
// #                                                                                               #
// # 2. Redistributions in binary form must reproduce the above copyright notice, this list of     #
// #    conditions and the following disclaimer in the documentation and/or other materials        #
// #    provided with the distribution.                                                            #
// #                                                                                               #
// # 3. Neither the name of the copyright holder nor the names of its contributors may be used to  #
// #    endorse or promote products derived from this software without specific prior written      #
// #    permission.                                                                                #
// #                                                                                               #
// # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS   #
// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF               #
// # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE    #
// # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,     #
// # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE #
// # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED    #
// # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING     #
// # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED  #
// # OF THE POSSIBILITY OF SUCH DAMAGE.                                                            #
// # ********************************************************************************************* #
// # The NEORV32 Processor - https://github.com/stnolting/neorv32              (c) Stephan Nolting #
// #################################################################################################
 
 
/**********************************************************************//**
 * @file demo_pwm/main.c
 * @author Stephan Nolting
 * @brief Simple PWM usage example.
 **************************************************************************/
 
#include <neorv32.h>
 
 
/**********************************************************************//**
 * @name User configuration
 **************************************************************************/
/**@{*/
/** UART BAUD rate */
#define BAUD_RATE 19200
/** Maximum PWM output intensity (0..255) */
#define PWM_MAX 128
/**@}*/
 
 
/**********************************************************************//**
 * This program generates a simple dimming sequence for PWM channel 0,1,2.
 *
 * @note This program requires the PWM controller to be synthesized (the UART is optional).
 *
 * @return 0 if execution was successful
 **************************************************************************/
int main() {
 
  // check if PWM unit is implemented at all
  if (neorv32_pwm_available() == 0) {
    return 1;
  }
 
 
  // capture all exceptions and give debug info via UART
  // this is not required, but keeps us safe
  neorv32_rte_setup();
 
 
  // init UART at default baud rate, no parity bits, ho hw flow control
  neorv32_uart_setup(BAUD_RATE, PARITY_NONE, FLOW_CONTROL_NONE);
 
  // check available hardware extensions and compare with compiler flags
  neorv32_rte_check_isa(0); // silent = 0 -> show message if isa mismatch
 
  // say hello
  neorv32_uart_print("PWM demo program\n");
 
 
  // deativate all PWM channels
  neorv32_pwm_set(0, 0);
  neorv32_pwm_set(1, 0);
  neorv32_pwm_set(2, 0);
  neorv32_pwm_set(3, 0);
 
  // configure and enable PWM
  neorv32_pwm_setup(CLK_PRSC_64);
 
 
  uint8_t pwm = 0;
  uint8_t up = 1;
  uint8_t ch = 0;
 
  // animate!
  while(1) {
 
    // update duty cycle
    if (up) {
      if (pwm == (PWM_MAX & 0xFF)) {
        up = 0;
      }
      else {
        pwm++;
      }
    }
    else {
      if (pwm == 0) {
        ch = (ch + 1) & 3; // goto next channel
        up = 1;
      }
      else {
        pwm--;
      }
    }
 
    // output new duty cycle
    if (ch != 3) { // skip channel 3
      neorv32_pwm_set(ch, pwm);
    }
 
    neorv32_cpu_delay_ms(10); // wait ~10ms
  }
 
  return 0;
}

Line No.	Rev	Author	Line
1	2	zero_gravi	`// #################################################################################################`
2			`// # << NEORV32 - PWM Demo Program >> #`
3			`// # ********************************************************************************************* #`
4			`// # BSD 3-Clause License #`
5			`// # #`
6	44	zero_gravi	`// # Copyright (c) 2021, Stephan Nolting. All rights reserved. #`
7	2	zero_gravi	`// # #`
8			`// # Redistribution and use in source and binary forms, with or without modification, are #`
9			`// # permitted provided that the following conditions are met: #`
10			`// # #`
11			`// # 1. Redistributions of source code must retain the above copyright notice, this list of #`
12			`// # conditions and the following disclaimer. #`
13			`// # #`
14			`// # 2. Redistributions in binary form must reproduce the above copyright notice, this list of #`
15			`// # conditions and the following disclaimer in the documentation and/or other materials #`
16			`// # provided with the distribution. #`
17			`// # #`
18			`// # 3. Neither the name of the copyright holder nor the names of its contributors may be used to #`
19			`// # endorse or promote products derived from this software without specific prior written #`
20			`// # permission. #`
21			`// # #`
22			`// # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS #`
23			`// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF #`
24			`// # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE #`
25			`// # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, #`
26			`// # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE #`
27			`// # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED #`
28			`// # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING #`
29			`// # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED #`
30			`// # OF THE POSSIBILITY OF SUCH DAMAGE. #`
31			`// # ********************************************************************************************* #`
32			`// # The NEORV32 Processor - https://github.com/stnolting/neorv32 (c) Stephan Nolting #`
33			`// #################################################################################################`
34
35
36			`/********************************************************************//`
37			`* @file demo_pwm/main.c`
38			`* @author Stephan Nolting`
39			`* @brief Simple PWM usage example.`
40			`**************************************************************************/`
41
42			`#include <neorv32.h>`
43
44
45			`/********************************************************************//`
46			`* @name User configuration`
47			`**************************************************************************/`
48			`/*@{/`
49			`/** UART BAUD rate */`
50			`#define BAUD_RATE 19200`
51			`/** Maximum PWM output intensity (0..255) */`
52	34	zero_gravi	`#define PWM_MAX 128`
53	2	zero_gravi	`/*@}/`
54
55
56			`/********************************************************************//`
57			`* This program generates a simple dimming sequence for PWM channel 0,1,2.`
58			`*`
59	34	zero_gravi	`* @note This program requires the PWM controller to be synthesized (the UART is optional).`
60	2	zero_gravi	`*`
61	60	zero_gravi	`* @return 0 if execution was successful`
62	2	zero_gravi	`**************************************************************************/`
63			`int main() {`
64
65			`// check if PWM unit is implemented at all`
66			`if (neorv32_pwm_available() == 0) {`
67	60	zero_gravi	`return 1;`
68	2	zero_gravi	`}`
69
70
71			`// capture all exceptions and give debug info via UART`
72			`// this is not required, but keeps us safe`
73	14	zero_gravi	`neorv32_rte_setup();`
74	2	zero_gravi
75
76	51	zero_gravi	`// init UART at default baud rate, no parity bits, ho hw flow control`
77			`neorv32_uart_setup(BAUD_RATE, PARITY_NONE, FLOW_CONTROL_NONE);`
78	2	zero_gravi
79	44	zero_gravi	`// check available hardware extensions and compare with compiler flags`
80			`neorv32_rte_check_isa(0); // silent = 0 -> show message if isa mismatch`
81
82	2	zero_gravi	`// say hello`
83			`neorv32_uart_print("PWM demo program\n");`
84
85
86			`// deativate all PWM channels`
87			`neorv32_pwm_set(0, 0);`
88			`neorv32_pwm_set(1, 0);`
89			`neorv32_pwm_set(2, 0);`
90			`neorv32_pwm_set(3, 0);`
91
92			`// configure and enable PWM`
93			`neorv32_pwm_setup(CLK_PRSC_64);`
94
95
96			`uint8_t pwm = 0;`
97			`uint8_t up = 1;`
98			`uint8_t ch = 0;`
99
100			`// animate!`
101			`while(1) {`
102
103			`// update duty cycle`
104			`if (up) {`
105			`if (pwm == (PWM_MAX & 0xFF)) {`
106			`up = 0;`
107			`}`
108			`else {`
109			`pwm++;`
110			`}`
111			`}`
112			`else {`
113			`if (pwm == 0) {`
114			`ch = (ch + 1) & 3; // goto next channel`
115			`up = 1;`
116			`}`
117			`else {`
118			`pwm--;`
119			`}`
120			`}`
121
122			`// output new duty cycle`
123			`if (ch != 3) { // skip channel 3`
124			`neorv32_pwm_set(ch, pwm);`
125			`}`
126
127	34	zero_gravi	`neorv32_cpu_delay_ms(10); // wait ~10ms`
128	2	zero_gravi	`}`
129
130			`return 0;`
131			`}`

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[/] [neorv32/] [trunk/] [sw/] [example/] [demo_pwm/] [main.c] - Blame information for rev 60