Inductance measurement on ch32v003

inductive_measure.c

// Assume setup from touch control
// Connect 20 turns of ~2" wide 28AWG wire between PA2 and GND.

void RunTest()__attribute__((noinline, section(".srodata")));

void DelaySysTick_RAM( uint32_t n ) __attribute__((noinline, section(".srodata")));
void DelaySysTick_RAM( uint32_t n )
{
#if defined(CH32V003) || defined(CH32V00x)
	uint32_t targend = SysTick->CNT + n;
	while( ((int32_t)( SysTick->CNT - targend )) < 0 );
#elif defined(CH32V20x) || defined(CH32V30x) || defined(CH32X03x) || defined(CH32L103) || defined(CH582_CH583) || defined(CH591_CH592) || defined(CH32H41x)
	uint64_t targend = SysTick->CNT + n;
	while( ((int64_t)( SysTick->CNT - targend )) < 0 );
#elif defined(CH32V10x) || defined(CH570_CH572) || defined(CH584_CH585)
	uint32_t targend = SysTick->CNTL + n;
	while( ((int32_t)( SysTick->CNTL - targend )) < 0 );
#elif defined(CH571_CH573)
	// ch573 insisted on being special, it's counting down
	uint64_t targend = SysTick->CNT - n;
	while( ((int64_t)( SysTick->CNT - targend )) > 0 );
#else
	#error DelaySysTick not defined.
#endif
}


void RunTest()
{
while(1)
{
	int d;
	//for( d = 0; d < 80; d+= 10 )
	{
		int it;
		int ret = 0;
		for( it = 0; it < 1000; it++ )
		{
			FORCEALIGNADC
			ADC1->CTLR2 = ADC_ADON | ADC_EXTSEL;
			funDigitalWrite( PA2, 1 );
			DelaySysTick_RAM( 300 );
			ADC1->CTLR2 = ADC_SWSTART | ADC_ADON | ADC_EXTSEL;
			while(!(ADC1->STATR & ADC_EOC));
			ret += ADC1->RDATAR;
			funDigitalWrite( PA2, 0 );
		}
		//printf( "%d%c", ret, (d < 70)?' ':'\n' );
		printf( "%d\n", ret );
	}
}
}