salfter/nixie-driver
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This commit is contained in:
cnlohr
2023-04-23 02:40:36 -04:00
parent cc6365c1f4
commit 5938ad70cd
2 changed files with 22 additions and 13 deletions
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31
firmware/nixitest1/nixitest1.c
View File

@@ -1,4 +1,3 @@
// Could be defined here, or in the processor defines.
#define SYSTEM_CORE_CLOCK 48000000
#include "ch32v003fun.h"
@@ -9,8 +8,8 @@
uint32_t count;
//#define ENABLE_TUNING
// VDD Adjusted.
#define ABSOLUTE_MAX_ADC_SET 208 // Actually around 188V (0 to 208 maps to 0 to 190V)
#define ABSOLUTE_MAX_ADC_SET 208 // Actually around 190V (0 to 208 maps to 0 to 190V)
// Do not mess with PWM_ values unless you know what you are willing to go down a very deep rabbit hole.
#ifndef ENABLE_TUNING
@@ -20,7 +19,11 @@ int PWM_PERIOD = 140;
#endif
int PWM_MAXIMUM_DUTY = 48; //This actually gets overwrittenin the first few milliseconds onces a system VDD is read.
#define ERROR_P_TERM 1 // Actually a shift. Normally we would do the opposite to smooth out, but we can realy bang this around! It's OK if we rattle like crazy.
#define ERROR_P_TERM 2 // Actually a shift. Normally we would do the opposite to smooth out, but we can realy bang this around! It's OK if we rattle like crazy.
// We can filter
#define ADC_IIR 2
#define VDD_IIR 2
int update_targ_based_on_vdd = 0;
int target_feedback = 0;
@@ -44,7 +47,8 @@ void ADC1_IRQHandler(void) __attribute__((interrupt));
void ADC1_IRQHandler(void)
{
// This interrupt should happen ~3.5uS on current settings.
int adc = lastadc = ADC1->RDATAR;
lastadc = ADC1->RDATAR + (lastadc - (lastadc>>ADC_IIR));
int adc = lastadc>>ADC_IIR;
int err = target_feedback_vdd_adjusted - adc;
ADC1->STATR &= ~ADC_EOC;
@@ -58,11 +62,12 @@ void ADC1_IRQHandler(void)
}
int fadepos = (++count) & 0xff;
if( fadepos == 0 )
if( fadepos & 1 )
{
ADC1->CTLR2 |= ADC_JSWSTART;
}
else if( fadepos == 2 )
else
{
// Use injection channel data to read vref.
// Ballparks:
@@ -82,16 +87,20 @@ void ADC1_IRQHandler(void)
// 373 -> 84 // Ratio is 4.440
// 240 -> 56 // Ratio is 4.444
// Wow! That's nice!
lastvdd = ADC1->IDATAR1;
// TODO: Consider filtering lastvdd.
//lastvdd = ADC1->IDATAR1; // Don't filter VDD
lastvdd = ADC1->IDATAR1 + (lastvdd - (lastvdd>>VDD_IIR)); // Filter VDD (but now it's 2^VDD_IIR bigger)
#ifndef ENABLE_TUNING
// IF we aren't enabling tuning, we can update max-on-time with this value.
// There's a neat hack where you can divide by weird decimal divisors by adding and subtracing terms.
// I apply that weird trick here.
// 1÷(1÷4−1÷64−1÷128−1÷1024) is roughly equal to dividing by 4.43290
// We actually can simplify it for our purposes as: 1÷(1÷4−1÷64−1÷128)
//
PWM_MAXIMUM_DUTY = (lastvdd>>2) - (lastvdd>>6) - (lastvdd>>7); // lastvdd / 4.44. For ~5V, this works out to 45, for ~3.3V it works out to ~70.
PWM_MAXIMUM_DUTY = (lastvdd>>(2+VDD_IIR)) - (lastvdd>>(6+VDD_IIR)) - (lastvdd>>(7+VDD_IIR)); // lastvdd / 4.44. For ~5V, this works out to 45, for ~3.3V it works out to ~70.
#endif
update_targ_based_on_vdd = 1;
}
@@ -261,7 +270,7 @@ static void HandleCommand( uint32_t dmdword )
}
}
*DMDATA0 = (lastadc << 12) | (lastvdd << 22);
*DMDATA0 = ((lastadc>>ADC_IIR) << 12) | ((lastvdd>>VDD_IIR) << 22);
}
int main()
@@ -325,7 +334,7 @@ int main()
// 680 = 192 * 373 / x = (373*680)/192 = 105.317647059
// Close enough to 128.
//
target_feedback_vdd_adjusted = (target_feedback * lastvdd) >> 7;
target_feedback_vdd_adjusted = (target_feedback * lastvdd) >> (7+VDD_IIR);
update_targ_based_on_vdd = 0;
}
}

4
firmware/nixitest1/testnix/testnix.c
View File

@@ -156,8 +156,8 @@ int main()
if( r ) { printf( "R: %d\n", r ); status = 0; goto retry; }
printf( "%08x\n", status );
float voltvdd = 1.21/(((status>>22)&0x3ff)/1023.0f); // vref = 2.2v
float voltage = ((((float)((status>>12)&0x3ff))/1023.0f)*100.0)*voltvdd;
float voltvdd = 1.20/(((status>>22)&0x3ff)/1023.0f); // vref = 2.2v
float voltage = ((((float)((status>>12)&0x3ff))/1023.0f)*101.0)*voltvdd; //101 because it's 10k + 1M
// Measured @ 176 reported here, but 180 in reality if ref is 1.2. But 1.21 fixes it.
volthist[volthisthead] = voltage;
volthistvdd[volthisthead] = voltvdd;