Subversion Repositories neo430

// #################################################################################################

// #  < Nested IRQs example >                                                                      #

// # ********************************************************************************************* #

// # Generates a run time clock using the timer IRQ.                                               #

// # Whenever a char via the UART is received, the according ISR show the current time.            #

// # ********************************************************************************************* #

// # BSD 3-Clause License                                                                          #

// #                                                                                               #

// # Copyright (c) 2020, 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 NEO430 Processor - https://github.com/stnolting/neo430                                    #

// #################################################################################################

// Libraries

#include <stdint.h>

#include <neo430.h>

// Configuration

#define BAUD_RATE  19200

// Function prototypes

void __attribute__((__interrupt__)) timer_irq_handler(void);

void __attribute__((__interrupt__)) uart_irq_handler(void);

// Variable

volatile uint64_t time_ms;

/* ------------------------------------------------------------

 * INFO Main function

 * ------------------------------------------------------------ */

int main(void) {

  // setup UART

  neo430_uart_setup(BAUD_RATE);

  // check if TIMER unit was synthesized, exit if no TIMER is available

  if (!(SYS_FEATURES & (1<<SYS_TIMER_EN))) {

    neo430_uart_br_print("Error! No TIMER unit synthesized!");

    return 1;

  }

  // reset time

  time_ms = 0;

  // intro text

//neo430_uart_br_print("\nClock example. Press any key to show the current time.\n");

  // init TIMER IRQ

  // ------------------------------------------------------

  // set address of timer IRQ handler

  IRQVEC_TIMER = (uint16_t)(&timer_irq_handler);

  // configure timer frequency

  neo430_timer_disable();

  uint16_t timer_thres;

  if (neo430_timer_config_freq(1000, &timer_thres)) { // 1kHz to increment every 1ms

    neo430_uart_br_print("Invalid TIMER frequency!\n");

  }

  neo430_printf("THR: %x, CTR: %x\n", TMR_THRES, TMR_CT);

  TMR_CT |= (1<<TMR_CT_EN) | (1<<TMR_CT_ARST) | (1<<TMR_CT_IRQ) | (1<<TMR_CT_RUN); // enable timer, auto-reset, irq enabled, start timer

  neo430_printf("THR: %x, CTR: %x\n", TMR_THRES, TMR_CT);

  // init UART RX IRQ

  // ------------------------------------------------------

  // set address of UART IRQ handler

  IRQVEC_SERIAL = (uint16_t)(&uart_irq_handler);

  // activate UART RX interrupt

  UART_CT |= (1<<UART_CT_RX_IRQ);

  // enable global IRQs

  neo430_eint();

  // do nothing

  while (1) {

    neo430_sleep();

  }

  return 0;

}

/* ------------------------------------------------------------

 * INFO Timer interrupt handler

 * ------------------------------------------------------------ */

void __attribute__((__interrupt__)) timer_irq_handler(void) {

  time_ms++;

}

/* ------------------------------------------------------------

 * INFO UART interrupt handler

 * ------------------------------------------------------------ */

void __attribute__((__interrupt__)) uart_irq_handler(void) {

  // reactive IRQs to allow nested interrupts

  neo430_eint();

  // show time

  uint32_t current_time = time_ms; // in seconds

  uint16_t hour     = (uint16_t)( (((current_time/10000)/60)/3600)%24 );

  uint16_t minute   = (uint16_t)( ((current_time/1000)/60)%60 );

  uint16_t second   = (uint16_t)( (current_time/1000)%60 );

  uint16_t m_second = (uint16_t)( (current_time%1000)%1000 );

  neo430_printf("Current runtime: %u:%u:%u:%u\n", hour, minute, second, m_second);

}