75 lines
2.0 KiB
C
75 lines
2.0 KiB
C
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/*
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use ctimer to do a LED blink
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*/
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#include <LPC8xx.h>
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#include <syscon.h>
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#include <gpio.h>
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#include <swm.h>
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#include <ctimer.h>
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#include <delay.h>
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/*=======================================================================*/
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/* Configuration */
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#define SYS_TICK_PERIOD_IN_MS 100
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/*=======================================================================*/
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/* system procedures and sys tick master task */
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volatile uint32_t sys_tick_irq_cnt=0;
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void __attribute__ ((interrupt)) SysTick_Handler(void)
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{
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sys_tick_irq_cnt++;
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}
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/*=======================================================================*/
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/*
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setup the hardware and start interrupts.
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called by "Reset_Handler"
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*/
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int __attribute__ ((noinline)) main(void)
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{
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/* call to the lpc lib setup procedure. This will set the IRC as clk src and main clk to 24 MHz */
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SystemInit();
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/* if the clock or PLL has been changed, also update the global variable SystemCoreClock */
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SystemCoreClockUpdate();
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/* set systick and start systick interrupt */
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SysTick_Config(main_clk/1000UL*(unsigned long)SYS_TICK_PERIOD_IN_MS);
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/* */
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GPIOInit();
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/* enable clock for several subsystems */
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Enable_Periph_Clock(CLK_IOCON);
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Enable_Periph_Clock(CLK_SWM);
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Enable_Periph_Clock(CLK_CTIMER0);
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GPIOSetDir( PORT0, 15, OUTPUT);
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LPC_CTIMER0->PR = 0; /* no prescale */
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LPC_CTIMER0->MR[3] = 15000000; /* PWM cycle length: one second with 15MHz AHB clock */
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LPC_CTIMER0->MCR |= 1<<MR3R; /* Use MR3 value to reset the counter: MR3 is the upper value and sets the PWM cycle */
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LPC_CTIMER0->MR[0] = 5000000; /* PWM duty cycle in MR0 */
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LPC_CTIMER0->PWMC |= 1<<PWMEN0; /* PWM mode for MR0 */
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/* first reset the pin assignment to 0xff (this is also the reset value */
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LPC_SWM->PINASSIGN[T0_MAT0/4] |= ((0xffUL)<<(8*(T0_MAT0%4)));
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/* then write the destination pin to it */
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LPC_SWM->PINASSIGN[T0_MAT0/4] &= ~((15UL^255UL)<<(8*(T0_MAT0%4)));
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LPC_CTIMER0->TCR |= 1<<CEN; /* enalble the timer */
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}
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