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//////////////////////////////////////////////////////////////////////

////                                                              ////

////                                                              ////

//// OR1K Timer Demo Software                                     ////

////                                                              ////

//// Description:                                                 ////

////             Demonstrate timer.                               ////

////             First block main loop while checking ticks, then ////

////             install custom tick handler and do other things  ////

////             while tick timer fires. The "other things" use   ////

////             the UART, so too does the custom tick handler,   ////

////             so the tick interrupt is blocked while the main  ////

////             loop is using the UART.                          ////

////                                                              ////

//// Author(s):                                                   ////

////            Julius Baxter, julius@opencores.org               ////

////                                                              ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

////                                                              ////

//// Copyright (C) 2011 Authors and OPENCORES.ORG                 ////

////                                                              ////

//// This source file may be used and distributed without         ////

//// restriction provided that this copyright statement is not    ////

//// removed from the file and that any derivative work contains  ////

//// the original copyright notice and the associated disclaimer. ////

////                                                              ////

//// This source file is free software; you can redistribute it   ////

//// and/or modify it under the terms of the GNU Lesser General   ////

//// Public License as published by the Free Software Foundation; ////

//// either version 2.1 of the License, or (at your option) any   ////

//// later version.                                               ////

////                                                              ////

//// This source is distributed in the hope that it will be       ////

//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////

//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////

//// PURPOSE.  See the GNU Lesser General Public License for more ////

//// details.                                                     ////

////                                                              ////

//// You should have received a copy of the GNU Lesser General    ////

//// Public License along with this source; if not, download it   ////

//// from http://www.opencores.org/lgpl.shtml                     ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

#include "cpu-utils.h"

#include "spr-defs.h"

#include "board.h"

#include "uart.h"

#include "printf.h"

/* RTOS-like critical section enter and exit functions */

static inline void disable_ttint(void)

{

        // Disable timer interrupt in supervisor register

        mtspr (SPR_SR, mfspr (SPR_SR) & ~SPR_SR_TEE);

        // Disable timer interrupt generation in tick timer mode register

        //mtspr(SPR_TTMR, mfspr (SPR_TTMR) & ~SPR_TTMR_IE);

}

static inline void enable_ttint(void)

{

        // Enable timer interrupt in supervisor register

        mtspr(SPR_SR, SPR_SR_TEE | mfspr(SPR_SR));

        // Enable timer interrupt generation in tick timer mode register

        //mtspr(SPR_TTMR, mfspr (SPR_TTMR) | SPR_TTMR_IE);

}

#define MAIN_PRINT_ENTER disable_ttint

#define MAIN_PRINT_EXIT enable_ttint

void

print_time(void)

{

        static int ms_counter = 0;

        static int s_counter = 0;

        // Position the cursor on the line and print the time so far.

        // Usually we go on 100 ticks per second, which is 10ms each:

        if (TICKS_PER_SEC == 100)

                ms_counter += 10;

        if (ms_counter >= 1000)

        {

                s_counter++;

                ms_counter = 0;

        }

        // Sometimes print hasn't finished properly...

        printf("\r");

        // ANSI Escape sequence "\esc[40C" - cursor forward 40 places

        uart_putc(DEFAULT_UART,0x1b);

        uart_putc(DEFAULT_UART,0x5b);

        uart_putc(DEFAULT_UART,'4');

        uart_putc(DEFAULT_UART,'0');

        uart_putc(DEFAULT_UART,'C');

        // ANSI Escape sequence "\esc[K" - delete rest of line

        uart_putc(DEFAULT_UART,0x1b);

        uart_putc(DEFAULT_UART,0x5b);

        uart_putc(DEFAULT_UART,'K');

        printf("%2d.%03d",s_counter,ms_counter);

        printf("\r");

}

void our_timer_handler(void);

void our_timer_handler(void)

{

        // Call time output function

        print_time();

        // can potentially also call cpu_timer_tick() here to hook back into

        // the CPU's timer tick function.

        // Reset timer mode register to interrupt with same interval

        mtspr(SPR_TTMR, SPR_TTMR_IE | SPR_TTMR_RT |

              ((IN_CLK/TICKS_PER_SEC) & SPR_TTMR_PERIOD));

}

int

main (void)

{

        int seconds;

        unsigned long *adr;

        unsigned long data;

        volatile int i;

        uart_init(DEFAULT_UART);

        printf("\nOR1200 Timer Demo\n");

        printf("\nInitialising Timer\n");

        // Reset timing variables

        seconds = 0;

        cpu_reset_timer_ticks();

        cpu_enable_timer();

        printf("\nBlocking main() loop for 5 seconds\n");

        printf("Elapsed: %ds",seconds);

        while(seconds < 5)

        {

                while (cpu_get_timer_ticks() < (TICKS_PER_SEC * (seconds+1)));

                seconds++;

                printf("\rElapsed: %ds",seconds);

        }

        printf("\n");

        printf("\nInstalling our timer handler\n");

        printf("\nmain() loop will dump mem. contents, timer interrupt will print time\n");

        add_handler(0x5 /* Timer */, our_timer_handler);

        adr=0;

        while(1)

        {

                data = *(adr++);

                // Disable tick timer interrupt here, as UART printing is not

                // re-entrant!

                MAIN_PRINT_ENTER;

                printf("0x%08x: 0x%08x\r",adr,data);

                MAIN_PRINT_EXIT;

                // Delay a little bit..

                for(i=0;i<40000;i++);

        }

        return 0;

}