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[/] [openrisc/] [trunk/] [orpsocv2/] [sw/] [tests/] [or1200/] [board/] [or1200-timerdemo.c] - Rev 733
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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; }
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