Inital commit Version 1.0

2020-02-03 23:19:58 +01:00
commit 0584796a67
6 changed files with 352 additions and 0 deletions
--- a/main.cpp
+++ b/main.cpp
@ -0,0 +1,124 @@
+#include <stdint.h>
+#include <avr/io.h>
+#include <util/delay.h>
+#include <avr/interrupt.h>
+#include <avr/sleep.h>
+#include "adc.h"
+#include "writepin.h"
+#include "ringbuffer.h"
+extern "C"
+{
+    #include "usbdrv.h"
+
+}
+
+volatile uint16_t sampleId = 0;
+
+void adcConversionCallback(uint16_t sample, void* userData);
+
+Adc adc(&adcConversionCallback, nullptr, Adc::IN_ADC1, Adc::VREF_VCC);
+
+RingBuffer<32, uint16_t> buffer;
+
+ISR(TIMER0_OVF_vect) 
+{
+   adc.aquire();
+}
+
+
+extern "C" usbMsgLen_t usbFunctionSetup(uchar data[8])
+{
+    usbRequest_t    *rq = (usbRequest_t *)data;
+    static uchar    dataBuffer[8]; 
+
+    if(rq->bRequest == 0)
+    {
+        if(!buffer.isEmpty() && !buffer.isEmpty() && rq->wLength.word >= 4 )
+        {
+            usbMsgLen_t length = buffer.remaining()+2;
+            if(length > 8) length = 8;
+            if(length > rq->wLength.word) length = rq->wLength.word;
+            dataBuffer[0] = sampleId-buffer.remaining() >> 8;
+            dataBuffer[1] = sampleId-buffer.remaining() & 0x00FF;
+            for(usbMsgLen_t i = 2; i+1 < length; i+=2) 
+            {
+                uint16_t sample = buffer.read();
+                dataBuffer[i] = sample >> 8;
+                dataBuffer[i+1] = sample & 0x00FF;
+            }
+            usbMsgPtr = (short unsigned int)dataBuffer;
+            return length;
+        }
+    }
+    if(rq->bRequest == 1)
+    {
+        if(rq->wValue.word == 0) adc.setInput(Adc::IN_ADC1);
+        else adc.setInput(Adc::IN_ADC0);
+        buffer.flush();
+        return 0;
+    }
+    if(rq->bRequest == 2)
+    {
+        if(rq->wValue.word == 0) adc.setReferance(Adc::VREF_VCC);
+        else if(rq->wValue.word == 1) adc.setReferance(Adc::VREF_1_1);
+        else adc.setReferance(Adc::VREF_2_56);
+        buffer.flush();
+        return 0;
+    }
+    else if(rq->bRequest == 128)
+    {
+        dataBuffer[0] = 55;
+        dataBuffer[1] = 55;
+        dataBuffer[2] = 55;
+        dataBuffer[3] = 55;
+        usbMsgPtr = (short unsigned int)dataBuffer;
+        return 4;
+    }
+    else if(rq->bRequest == 129)
+    {
+        dataBuffer[0] = ADCSRA;
+        dataBuffer[1] = ADMUX;
+        usbMsgPtr = (short unsigned int)dataBuffer;
+        return 2;
+    }
+    if(rq->bRequest == 130)
+    {
+        constexpr uint16_t freq = 30518;
+        dataBuffer[0] = freq >> 8;
+        dataBuffer[1] = freq & 0x00FF;
+        usbMsgPtr = (short unsigned int)dataBuffer;
+        return 2;
+    }
+    return 0; 
+}
+
+void adcConversionCallback(uint16_t sample, void* userData)
+{
+    buffer.write(sample);
+    sampleId++;
+}
+
+void timer0InterruptEnable(const bool enable)
+{
+     if(enable) TIMSK = TIMSK | (1 << TOIE0);
+     else TIMSK = TIMSK & ~(1 << TOIE0);
+}
+
+int main()
+{
+    DIDR0 |= (1 << PB2); 
+    TCCR0B = (1<<CS02); // run timer0 with /256 scaler
+    timer0InterruptEnable(true);
+    usbInit();
+    usbDeviceDisconnect();  // enforce re-enumeration, do this while interrupts are disabled!
+    _delay_ms(250);
+    
+    usbDeviceConnect();
+    
+    sei();
+    while(true)
+    {     
+        usbPoll();
+    }
+}
+