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ctimer

This commit is contained in:
kraus 2019-08-31 00:26:13 +02:00
parent fcde321a85
commit d4a575ba9f
1 changed files with 31 additions and 4 deletions
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35
sys/arm/lpc804/ctimer/main.c
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@ -29,6 +29,24 @@ void __attribute__ ((interrupt)) SysTick_Handler(void)
sys_tick_irq_cnt++;
}
/*=======================================================================*/
/*
replacement for ConfigSWM(uint32_t func, uint32_t port_pin)
Args:
fn: A function number, e.g. T0_MAT0, see swm.h
port: A port number for the GPIO port (0..30)
*/
void mapFunctionToPort(uint32_t fn, uint32_t port)
{
/* first reset the pin assignment to 0xff (this is also the reset value */
LPC_SWM->PINASSIGN[fn/4] |= ((0xffUL)<<(8*(fn%4)));
/* then write the destination pin to it */
LPC_SWM->PINASSIGN[fn/4] &= ~((port^255UL)<<(8*(fn%4)));
}
/*=======================================================================*/
/*
setup the hardware and start interrupts.
@ -61,14 +79,23 @@ int __attribute__ ((noinline)) main(void)
LPC_CTIMER0->MR[3] = 15000000; /* PWM cycle length: one second with 15MHz AHB clock */
LPC_CTIMER0->MCR |= 1<<MR3R; /* Use MR3 value to reset the counter: MR3 is the upper value and sets the PWM cycle */
LPC_CTIMER0->MR[0] = 5000000; /* PWM duty cycle in MR0 */
LPC_CTIMER0->MR[0] = 14000000; /* PWM duty cycle in MR0 */
LPC_CTIMER0->PWMC |= 1<<PWMEN0; /* PWM mode for MR0 */
/* first reset the pin assignment to 0xff (this is also the reset value */
LPC_SWM->PINASSIGN[T0_MAT0/4] |= ((0xffUL)<<(8*(T0_MAT0%4)));
//LPC_SWM->PINASSIGN[T0_MAT0/4] |= ((0xffUL)<<(8*(T0_MAT0%4)));
/* then write the destination pin to it */
LPC_SWM->PINASSIGN[T0_MAT0/4] &= ~((15UL^255UL)<<(8*(T0_MAT0%4)));
//LPC_SWM->PINASSIGN[T0_MAT0/4] &= ~((15UL^255UL)<<(8*(T0_MAT0%4)));
/* first reset the pin assignment to 0xff (this is also the reset value */
//LPC_SWM->PINASSIGN[T0_MAT0/4] |= ((0xffUL)<<(8*(T0_MAT0%4)));
/* then write the destination pin to it */
//LPC_SWM->PINASSIGN[T0_MAT0/4] &= ~((15UL^255UL)<<(8*(T0_MAT0%4)));
mapFunctionToPort(T0_MAT0, 30);
mapFunctionToPort(LVLSHFT_IN0, 30);
mapFunctionToPort(LVLSHFT_OUT0, 15);
LPC_CTIMER0->TCR |= 1<<CEN; /* enalble the timer */
}