From fb5a321dd7c2848128b04b306f3e1e59c87a3f70 Mon Sep 17 00:00:00 2001
From: Stijn Kuipers <stijnkuipers@gmail.com>
Date: Thu, 29 Jun 2023 16:26:07 +0200
Subject: Initial Filedump

Tadaaa!!
---
 sw/Core/Src/adc.h | 91 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100755 sw/Core/Src/adc.h

(limited to 'sw/Core/Src/adc.h')

diff --git a/sw/Core/Src/adc.h b/sw/Core/Src/adc.h
new file mode 100755
index 0000000..68ea07b
--- /dev/null
+++ b/sw/Core/Src/adc.h
@@ -0,0 +1,91 @@
+#pragma once
+
+#define ADC_CHANS  8
+#define ADC_SAMPLES 8
+extern u16 adcbuf[ADC_CHANS*ADC_SAMPLES];
+enum {
+	ADC_IN1, // fifth jack - pitch
+	ADC_IN2, // sixth jack - gate
+	ADC_IN3,  //third jack -
+	ADC_IN4,// fourth jack
+	ADC_IN5, // top jack
+	ADC_IN6, // second jack
+	ADC_POT1,
+	ADC_POT2,
+	
+	ADC_PITCH = ADC_IN1,
+	ADC_GATE = ADC_IN2,
+	ADC_XCV = ADC_IN3,
+	ADC_YCV = ADC_IN4,
+	ADC_ACV = ADC_IN5,
+	ADC_BCV = ADC_IN6,
+	ADC_AKNOB = ADC_POT2,
+	ADC_BKNOB = ADC_POT1,
+};
+void adc_init(void);
+
+typedef struct CVCalib {
+	float bias, scale;
+} CVCalib;
+
+#ifdef IMPL
+u16 adcbuf[ADC_CHANS*ADC_SAMPLES];
+CVCalib cvcalib[10] = {
+	// 6 input
+	{52100.f, 1.f / -9334.833333f},
+	{31716.f, 0.2f / -6548.1f},
+	{31665.f, 0.2f / -6548.1f},
+	{31666.f, 0.2f / -6548.1f},
+	{31041.f, 0.2f / -6548.1f},
+	{31712.f, 0.2f / -6548.1f},
+	// 2 pots 
+	{32768.f, 1.05f / -32768.f},
+	{32768.f, 1.05f / -32768.f},
+	// 2 output
+	// 2048 per semitone, so...
+	{42490.f, (26620-42490) * (1.f / (2048.f * 12.f * 2.f))},
+	{42511.f, (26634-42511) * (1.f / (2048.f * 12.f * 2.f))},
+};
+
+static inline int GetADCSmoothedNoCalib(int chan) {
+	u32 rv = 0;
+	u16* src = adcbuf + chan;
+	if (chan == ADC_GATE) { // get max not average, to respond to short gates better
+		for (int i = 0; i < ADC_SAMPLES; ++i) {
+			rv = maxi(rv,*src);
+			src += ADC_CHANS;
+		}
+		return rv;
+	}
+	for (int i = 0; i < ADC_SAMPLES; ++i) {
+		rv += *src;
+		src += ADC_CHANS;
+	}
+	return rv / ADC_SAMPLES;
+}
+
+static inline float GetADCSmoothed(int chan) {
+	return (GetADCSmoothedNoCalib(chan) - cvcalib[chan].bias) * cvcalib[chan].scale;
+}
+
+//volatile u32 adccounter;
+//
+//void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc) {
+//	adccounter++;
+//}
+
+void adc_init(void) {
+	for (int i = 0; i < ADC_CHANS * ADC_SAMPLES; ++i)
+		adcbuf[i] = 32768;
+#ifndef EMU
+	HAL_ADC_Start_DMA(&hadc1, (uint32_t*) &adcbuf, ADC_CHANS * ADC_SAMPLES);
+#endif
+}
+
+void adc_start(void) {
+#ifndef EMU
+	HAL_TIM_Base_Start(&htim6);
+#endif
+}
+
+#endif
-- 
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