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Initial support for Arduino UNO Minima (Renesas MCU) 

This change handles EXTERNAL vs AR_EXTERNAL definitions of ADC constants
as defined on different Arduino platforms (Atmega vs Renesas).
Also an ADC gain error is compensated for Uno R4. The compensation
values are work-in-progress as I only have a single Uno R4, which
might no produce typical ADC values. That means Uno R4 needs more testing
reports while calibrating the VPP voltages.
This commit is contained in:
ole00 2023-10-10 07:55:21 +01:00
parent 711da82260
commit 6beae4de9c
1 changed files with 45 additions and 3 deletions
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48
aftb_vpp.h
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@ -40,6 +40,17 @@
#define VPP_VERBOSE 0
#ifdef EXTERNAL
#define ANALOG_REF_EXTERNAL EXTERNAL
#else
#define ANALOG_REF_EXTERNAL AR_EXTERNAL
#endif
//UNO R4 Minima or Wifi (Aref internally pulled down by 130kOhm, AVR Uno R3 pulled down by 32kOhm)
#ifdef _RENESAS_RA_
#define AREF_IS_3V2
#endif
//pot wiper indices for the voltages
uint8_t vppWiper[MAX_WIPER] = {0};
@ -135,16 +146,39 @@ static void varVppSet(uint8_t value) {
varVppSetVppIndex(vppWiper[value]);
}
// UNO R4/Minima - Renesas IC (significant ADC gain errors measured)
#ifdef AREF_IS_3V2
#define SAMPLE_CNT 16
#define SAMPLE_DIVIDER 8
#define SAMPLE_MULTIPLIER 25
// SAMPLE_SHIFT moves the ADC gain error up/down
#define SAMPLE_SHIFT -45;
//AVR based Arduinos (no ADC gain errors measured)
#else
#define SAMPLE_CNT 14
#define SAMPLE_DIVIDER 8
#define SAMPLE_MULTIPLIER 1
#define SAMPLE_OFFSET 5
#endif
static int16_t varVppMeasureVpp(int8_t printValue) {
int8_t i = 0;
uint16_t r1 = 0;
int16_t r2; //correction for ADC gain error
while (i++ < SAMPLE_CNT) {
r1 += analogRead(VPP);
}
r1+= 5;
r1 /= 8;
r2 = (r1 / (SAMPLE_DIVIDER * SAMPLE_MULTIPLIER));
#ifdef SAMPLE_OFFSET
r1+= SAMPLE_OFFSET;
#endif
r1 /= SAMPLE_DIVIDER;
#ifdef SAMPLE_SHIFT
r2 += SAMPLE_SHIFT;
r1 += r2;
#endif
r1 += calOffset;
if (printValue) {
uint8_t a = r1%100;
@ -153,7 +187,14 @@ static int16_t varVppMeasureVpp(int8_t printValue) {
if (a < 10) {
Serial.print(F("0"));
}
#if 1
Serial.println(a);
#else
//debug - display the voltage skew value in r2
Serial.print(a);
Serial.println(F(", "));
Serial.println(r2);
#endif
}
return r1;
}
@ -258,9 +299,10 @@ static void varVppStoreWiperCalib() {
}
}
//return 1 on success (variable VPP functionality present), 0 on failure (VPP not detected on board)
static int8_t varVppInit(void) {
analogReference(EXTERNAL); //use 3V3 external reference
analogReference(ANALOG_REF_EXTERNAL); //use 3V3 external reference
wiperStat = 0; //wiper disabled
mcp4131_init();