5363ec3672
Had to do it all at once due to name conflicts with API exposed in libopencm3. Quite invasive patch! Also precipitated an LED API...
160 lines
3.4 KiB
C
160 lines
3.4 KiB
C
/*
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* Copyright 2012 Benjamin Vernoux
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*
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* This file is part of HackRF.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include <libopencm3/lpc43xx/m4/nvic.h>
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#include <libopencm3/cm3/systick.h>
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#include <libopencm3/cm3/scs.h>
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#include "hackrf_core.h"
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/* Global counter incremented by SysTick Interrupt each millisecond */
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volatile uint32_t g_ulSysTickCount;
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uint32_t g_NbCyclePerSecond;
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void systick_setup(void)
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{
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uint32_t systick_reload_val;
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g_ulSysTickCount = 0;
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/* Disable IRQ globally */
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__asm__("cpsid i");
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/* Set processor Clock as Source Clock */
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systick_set_clocksource(STK_CTRL_CLKSOURCE);
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/* Get SysTick calibration value to obtain by default 1 tick = 10ms */
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systick_reload_val = systick_get_calib();
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/*
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* Calibration seems wrong on LPC43xx(TBC) for default Freq it assume System Clock is 12MHz but it is 12*17=204MHz
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* Fix the Calibration value bu multiplication by 17
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*/
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systick_reload_val = (systick_reload_val*17);
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/* To obtain 1ms per tick just divide by 10 the 10ms base tick and set the reload */
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systick_reload_val = systick_reload_val/10;
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systick_set_reload(systick_reload_val);
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systick_interrupt_enable();
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/* Start counting. */
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systick_counter_enable();
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/* Set SysTick Priority to maximum */
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nvic_set_priority(NVIC_SYSTICK_IRQ, 0xFF);
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/* Enable IRQ globally */
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__asm__("cpsie i");
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}
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void scs_dwt_cycle_counter_enabled(void)
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{
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SCS_DEMCR |= SCS_DEMCR_TRCENA;
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SCS_DWT_CTRL |= SCS_DWT_CTRL_CYCCNTENA;
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}
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uint32_t sys_tick_get_time_ms(void)
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{
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return g_ulSysTickCount;
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}
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uint32_t sys_tick_delta_time_ms(uint32_t start, uint32_t end)
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{
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#define MAX_T_U32 ((2^32)-1)
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uint32_t diff;
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if(end > start)
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{
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diff=end-start;
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}else
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{
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diff=MAX_T_U32-(start-end)+1;
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}
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return diff;
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}
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void sys_tick_wait_time_ms(uint32_t wait_ms)
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{
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uint32_t start, end;
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uint32_t tickms;
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start = sys_tick_get_time_ms();
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do
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{
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end = sys_tick_get_time_ms();
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tickms = sys_tick_delta_time_ms(start, end);
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}while(tickms < wait_ms);
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}
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/* Called each 1ms/1000Hz by interrupt
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1) Count the number of cycle per second.
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2) Increment g_ulSysTickCount counter.
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*/
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void sys_tick_handler(void)
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{
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if(g_ulSysTickCount==0)
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{
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/* Clear Cycle Counter*/
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SCS_DWT_CYCCNT = 0;
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}else if(g_ulSysTickCount==1000)
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{
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/* Capture number of cycle elapsed during 1 second */
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g_NbCyclePerSecond = SCS_DWT_CYCCNT;
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}
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g_ulSysTickCount++;
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}
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int main(void)
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{
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pin_setup();
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enable_1v8_power();
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cpu_clock_init();
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scs_dwt_cycle_counter_enabled();
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systick_setup();
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led_on(LED1);
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led_on(LED2);
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led_on(LED3);
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while (1)
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{
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led_on(LED1);
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led_on(LED2);
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led_on(LED3);
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sys_tick_wait_time_ms(500);
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led_off(LED1);
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led_off(LED2);
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led_off(LED3);
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sys_tick_wait_time_ms(500);
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}
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return 0;
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}
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