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[/] [neo430/] [trunk/] [neo430/] [sw/] [example/] [pwm_demo/] [main.c] - Blame information for rev 198

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1 198 zero_gravi
// #################################################################################################
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// #  < PWM controller demo program >                                                              #
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// # ********************************************************************************************* #
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// # BSD 3-Clause License                                                                          #
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// #                                                                                               #
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// # Copyright (c) 2020, Stephan Nolting. All rights reserved.                                     #
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// #                                                                                               #
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// # Redistribution and use in source and binary forms, with or without modification, are          #
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// # permitted provided that the following conditions are met:                                     #
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// #                                                                                               #
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// # 1. Redistributions of source code must retain the above copyright notice, this list of        #
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// #    conditions and the following disclaimer.                                                   #
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// #                                                                                               #
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// # 2. Redistributions in binary form must reproduce the above copyright notice, this list of     #
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// #    conditions and the following disclaimer in the documentation and/or other materials        #
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// #    provided with the distribution.                                                            #
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// #                                                                                               #
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// # 3. Neither the name of the copyright holder nor the names of its contributors may be used to  #
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// #    endorse or promote products derived from this software without specific prior written      #
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// #    permission.                                                                                #
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// #                                                                                               #
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// # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS   #
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// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF               #
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// # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE    #
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// # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,     #
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// # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE #
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// # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED    #
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// # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING     #
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// # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED  #
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// # OF THE POSSIBILITY OF SUCH DAMAGE.                                                            #
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// # ********************************************************************************************* #
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// # The NEO430 Processor - https://github.com/stnolting/neo430                                    #
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// #################################################################################################
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// Libraries
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#include <stdint.h>
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#include <neo430.h>
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// Configuration
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#define BAUD_RATE 19200
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#define PWM_MAX   63
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/* ------------------------------------------------------------
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 * INFO Main function
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 * ------------------------------------------------------------ */
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int main(void) {
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  // setup UART
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  neo430_uart_setup(BAUD_RATE);
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  neo430_uart_br_print("\n<<< PWM controller demo >>>\n");
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  // check if PWM unit was synthesized, exit if no PWM controller is available
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  if (!(SYS_FEATURES & (1<<SYS_PWM_EN))) {
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    neo430_uart_br_print("Error! No PWM controller synthesized!");
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    return 1;
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  }
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  // enable pwm controller
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  neo430_pwm_enable(PWM_PRSC_2, 1, 0); // max frequency, 8-bit resolution, no GPIO modulation
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  // clear all channels
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  neo430_pwm_set(0, 0);
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  neo430_pwm_set(1, 0);
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  neo430_pwm_set(2, 0);
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  neo430_pwm_set(3, 0);
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  uint8_t pwm = 0;
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  uint8_t up = 1;
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  uint8_t ch = 0;
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  // animate!
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  while(1) {
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    // update duty cycle
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    if (up) {
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      if (pwm == (256/2)) // half max
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        up = 0;
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      else
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        pwm++;
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    }
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    else {
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      if (pwm == 0) {
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        ch = (ch + 1) & 3;
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        up = 1;
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      }
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      else
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        pwm--;
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    }
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    // output new duty cycle
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    neo430_pwm_set(ch, pwm);
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    neo430_cpu_delay_ms(4);
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  }
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  return 0;
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}

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