Revision 6:1f48212fbaf9, committed 2017-05-20

Comitter:

WiredHome

Date:

Sat May 20 19:52:23 2017 +0000

Parent:

5:49dd0c647a40

Commit message:

Signal Generator - a work in process as the need arises.

Changed in this revision

--- a/RA8875.lib	Mon Jan 16 22:57:59 2017 +0000
+++ b/RA8875.lib	Sat May 20 19:52:23 2017 +0000
@@ -1,1 +1,1 @@
-http://mbed.org/users/WiredHome/code/RA8875/#33ca352755a2
+http://mbed.org/users/WiredHome/code/RA8875/#e872d65a710d

--- a/SignalGenDAC.cpp	Mon Jan 16 22:57:59 2017 +0000
+++ b/SignalGenDAC.cpp	Sat May 20 19:52:23 2017 +0000
@@ -1,8 +1,11 @@
+//
+// Signal Generate DAC Driver
+//
+// Derived from AN10917: Memory to DAC data transfers using the LPC1700's DMA
+// 
 
 #include "SignalGenDAC.h"
 
-DigitalOut led(LED1);
-
 #define PI 3.14159      // for the sine-wave
 
 /// The linked list structure used to control the DMA transfer
@@ -36,13 +39,7 @@
 void SignalGenDAC::Start(bool oneShot) {
     printf("Start(%d) w/%d samples\r\n", oneShot ? 1 : 0, numSamples);
     isOn = (oneShot) ? false : true;
-    led = 1;
     
-    for (int x=0; x<numSamples; x++) {
-        DACsignal[x] = ((uint16_t)(VoltSignal[x]/maxV * 1023) << 6);
-        printf("%3d, %5.3f, %d\r\n", x, VoltSignal[x], DACsignal[x]);
-    }
-
     llio.source = (uint32_t)DACsignal;
     llio.destination = (uint32_t)&LPC_DAC->DACR;
     llio.next = (uint32_t)&llio;
@@ -57,9 +54,10 @@
     /* Load DMA Channel0 */
     LPC_GPDMACH0->DMACCSrcAddr   = (uint32_t)DACsignal;
     LPC_GPDMACH0->DMACCDestAddr  = (uint32_t)&LPC_DAC->DACR;
-    LPC_GPDMACH0->DMACCLLI       = (uint32_t)&llio;
+    LPC_GPDMACH0->DMACCLLI       = (oneShot) ? 0 : (uint32_t)&llio;
 
-    LPC_GPDMACH0->DMACCControl = numSamples   // transfer size (0 - 11) = 64
+    int playSampleCount = numSamples + oneShot;
+    LPC_GPDMACH0->DMACCControl = playSampleCount  // transfer size (0 - 11) = 64
                   | (0 << 12)         // source burst size (12 - 14) = 1
                   | (0 << 15)         // destination burst size (15 - 17) = 1
                   | (2 << 18)         // source width (18 - 20) = 32 bit
@@ -83,7 +81,7 @@
                   | (0 << 18);        // (27) = no HALT
 
     /* DACclk = 25 MHz, so 10 usec interval */
-    LPC_DAC->DACCNTVAL = 20;               // 16-bit reload value
+    LPC_DAC->DACCNTVAL = 18;               // 16-bit reload value
     /* DMA, timer running, dbuff */
     LPC_DAC->DACCTRL = 
           1<<3          // DMA_ENA dma burst is enabled
@@ -98,11 +96,10 @@
         wait_ms(1);
     aout->write(offset / maxV);
     isOn = false;
-    led = 0;
 }
 
 
-void SignalGenDAC::PrepareWaveform(SG_Mode mode, float _frequency, float _dutycycle, float _voltage, float _offset) {
+void SignalGenDAC::PrepareWaveform(SG_Waveform mode, float _frequency, float _dutycycle, float _voltage, float _offset) {
     int x, dcCount, firstQtr, lastQtr;
     frequency = _frequency;
     dutycycle = _dutycycle;
@@ -112,7 +109,7 @@
     float mid = rangelimit(offset, minV, maxV);
     float low = rangelimit(offset - voltage/2, minV, maxV);
     float v;
-    numSamples = 32;    // Ideally, compute this based on the frequency for good resolution
+    numSamples = 128;    // Ideally, compute this based on the frequency for good resolution
     dcCount = dutycycle/100.0 * numSamples;
     firstQtr = dcCount / 2;
     lastQtr = dcCount + (numSamples - dcCount)/2;
@@ -133,16 +130,20 @@
                 v = rangelimit(v, minV, maxV);
                 VoltSignal[x] = v;
             }
+            VoltSignal[numSamples] = rangelimit(offset, minV, maxV);
             break;
         case SG_SQUARE:
             for (x=0; x<numSamples; x++) {
-                if (x < dcCount) {
+                if (0 && x == 0) {
+                    v = rangelimit(offset, minV, maxV);                    
+                } else if (x < dcCount) {
                     v = rangelimit(offset + voltage/2, minV, maxV);
                 } else {
                     v = rangelimit(offset - voltage/2, minV, maxV);
                 }
                 VoltSignal[x] = v;
             }
+            VoltSignal[numSamples] = rangelimit(offset, minV, maxV);
             break;
         case SG_TRIANGLE:
             for (x=0; x<numSamples; x++) {
@@ -161,6 +162,7 @@
                 }
                 VoltSignal[x] = v;
             }
+            VoltSignal[numSamples] = rangelimit(offset, minV, maxV);
             break;
         case SG_SAWTOOTH:
             for (x=0; x<numSamples; x++) {
@@ -172,12 +174,13 @@
                 v = rangelimit(v, minV, maxV);
                 VoltSignal[x] = v;
             }
+            VoltSignal[numSamples] = rangelimit(offset, minV, maxV);
             break;
         case SG_USER:
             break;
     }
     //printf("DAC Data %3.2f %3.2f\r\n", voltage, offset);
-    for (x=0; x<numSamples; x++) {
+    for (x=0; x<=numSamples; x++) {
         DACsignal[x] = ((uint16_t)(VoltSignal[x]/maxV * 1023) << 6);
         printf("%3d, %5.3f, %d\r\n", x, VoltSignal[x], DACsignal[x]);
     }

--- a/SignalGenDAC.h	Mon Jan 16 22:57:59 2017 +0000
+++ b/SignalGenDAC.h	Sat May 20 19:52:23 2017 +0000
@@ -1,7 +1,9 @@
-
+//
+// Signal Generator DAC Driver
 //
 // Derived from AN10917: Memory to DAC data transfers using the LPC1700's DMA
 //
+// 
 #ifndef SIGNALGENDAC_H
 #define SIGNALGENDAC_H
 
@@ -12,6 +14,24 @@
 
 #define SIGNAL_MEM_ENTRIES 2048     // size of the DAC buffer
 
+/// The Signal Generator DAC Driver
+///
+/// This class provides the interface to first configure the DAC hardware characteristics,
+/// and then to define and control the DAC output.
+///
+/// A choice of waveforms is available (Sine, Square, Triangle, Sawtooth, and User Defined.
+///
+/// @todo add support for User Defined waveform.
+///
+/// @code
+/// SignalGenDAC g_signal;            // defaults to LPC1768 mbed module (p18 and 3.3v)
+/// 
+/// g_signal.PrepareWaveform(SG_SINE, 1000, 50, 2.2, 1.5);
+/// g_signal.Start();
+/// wait_ms(1000);
+/// g_signal.Stop();
+/// @endcode
+///
 class SignalGenDAC {
 
 public:
@@ -40,7 +60,7 @@
     /// @param[in] voltage is the peak-to-peak voltage, and it range limited to 0 to 3.0.
     /// @param[in] offset is the offset voltage, and is range limited to 0 to 3.0.
     ///
-    void PrepareWaveform(SG_Mode mode, float frequency, float dutycycle, float voltage, float offset);
+    void PrepareWaveform(SG_Waveform mode, float frequency, float dutycycle, float voltage, float offset);
 
     /// Start the signal, in either a oneshot, or continuous mode.
     ///

--- a/SignalGenDefs.h	Mon Jan 16 22:57:59 2017 +0000
+++ b/SignalGenDefs.h	Sat May 20 19:52:23 2017 +0000
@@ -16,6 +16,6 @@
     SG_USER,        ///< User defined waveform
     SG_KEYPAD,      ///< This is an internal value, not for applications
     SG_START,       ///< This is the start/stop/pulse button
-} SG_Mode;
+} SG_Waveform;
 
 #endif // SIGNALGENDEFS_H

--- a/SignalGenDisplay.cpp	Mon Jan 16 22:57:59 2017 +0000
+++ b/SignalGenDisplay.cpp	Sat May 20 19:52:23 2017 +0000
@@ -93,7 +93,7 @@
     { BTN_MODE_X+4*(BTN_W+BTN_S),BTN_MODE_Y,  BTN_MODE_X+4*(BTN_W+BTN_S)+BTN_W,BTN_MODE_Y+BTN_H },
 };
 static const int ModeCount = sizeof(ModeButtons)/sizeof(ModeButtons[0]);
-static const SG_Mode UI_ModeList[] = {
+static const SG_Waveform UI_ModeList[] = {
     SG_SINE,
     SG_SQUARE,
     SG_TRIANGLE,
@@ -317,6 +317,7 @@
                         for (int i=0; i<radio_CyclesCount; i++) {
                             if (lcd->Intersect(radio_Cycles[i], point)) {
                                 pulseMode = i;
+                                SaveSettings(OM_PULSE);
                                 signal->Stop();
                                 ShowCyclesControl();
                             }
@@ -346,7 +347,7 @@
         ini.ReadString("Signal", "Waveform", buf, sizeof(buf), ModeNames[0]);
         for (int i=0; i<ModeCount; i++) {
             if (strcmp(ModeNames[i], buf) == 0) {
-                mode = (SG_Mode)i;
+                mode = (SG_Waveform)i;
                 printf("Read ini mode is %d\r\n", mode);
                 break;
             }
@@ -761,7 +762,7 @@
     return ret;
 }
 
-bool SignalGenDisplay::SetWaveformMode(SG_Mode _mode, bool force) {
+bool SignalGenDisplay::SetWaveformMode(SG_Waveform _mode, bool force) {
     if (/* _mode >= SG_SINE && */ _mode <= SG_USER) {
         mode = _mode;
         printf("mode is %d\r\n", mode);
@@ -949,7 +950,7 @@
 //           .             |    |          \ /     /    |
 //            ++           +----+           +     +     +
 //
-void SignalGenDisplay::DrawWaveform(rect_t r, SG_Mode mode, color_t color, bool drawPure) {
+void SignalGenDisplay::DrawWaveform(rect_t r, SG_Waveform mode, color_t color, bool drawPure) {
     loc_t x,y;
     loc_t y0 = (r.p1.y + r.p2.y)/2;
     dim_t w = r.p2.x - r.p1.x;
@@ -1165,7 +1166,7 @@
     }
 }
 
-void SignalGenDisplay::DrawButton(rect_t r, bool pressed, SG_Mode mode, bool enable, int label) {
+void SignalGenDisplay::DrawButton(rect_t r, bool pressed, SG_Waveform mode, bool enable, int label) {
     rect_t wave;
     color_t buttonface = UI_BUTTON_FACE_DISABLED;
     color_t buttonshadow = UI_BUTTON_SHADOW_DISABLED;
@@ -1273,10 +1274,12 @@
         printf("SaveSettings - timeout [%02X]\r\n", Changes);
         if (Changes & OM_MODE) {
             Changes &= ~ OM_MODE;
+            printf("  Signal:Waveform=%s\r\n", ModeNames[mode]);
             ini.WriteString("Signal", "Waveform", ModeNames[mode]);
         }
         if (Changes & OM_PULSE) {
             Changes &= ~ OM_PULSE;
+            printf("  Signal:Pulse Mode=%s\r\n", PulseModeLabels[pulseMode]);
             ini.WriteString("Signal", "Pulse Mode", PulseModeLabels[pulseMode]);
         }
         if (Changes & OM_FREQ) {

--- a/SignalGenDisplay.h	Mon Jan 16 22:57:59 2017 +0000
+++ b/SignalGenDisplay.h	Sat May 20 19:52:23 2017 +0000
@@ -169,7 +169,7 @@
     /// @param[in] force as true will force it to set the mode, redrawing the screen
     /// @returns true if the value was accepted
     ///
-    bool SetWaveformMode(SG_Mode mode, bool force = false);
+    bool SetWaveformMode(SG_Waveform mode, bool force = false);
     
     /// Operating mode changes
     ///
@@ -226,7 +226,7 @@
         VS_Settings,
     } VisualScreen;
     VisualScreen vis;
-    SG_Mode mode;       ///< signal mode
+    SG_Waveform mode;       ///< signal mode
     float frequency;    ///< selected frequency
     float dutycycle;    ///< selected duty cycle
     float voltage;      ///< selected voltage
@@ -266,8 +266,8 @@
     void DrawNavGadget(void);
     void DrawModeButtons(void);
     void DrawKeypadEnabled(bool enable = false);
-    void DrawButton(rect_t r, bool pressed, SG_Mode mode, bool enable = false, int label=0);
-    void DrawWaveform(rect_t r, SG_Mode mode, color_t color, bool drawPure = false);    // pure ignores, voltage,offset,dutycycle
+    void DrawButton(rect_t r, bool pressed, SG_Waveform mode, bool enable = false, int label=0);
+    void DrawWaveform(rect_t r, SG_Waveform mode, color_t color, bool drawPure = false);    // pure ignores, voltage,offset,dutycycle
     float rangelimit(float value, float minV, float maxV);
     void ShowCyclesControl(void);
     

--- a/SignalGenModel.h	Mon Jan 16 22:57:59 2017 +0000
+++ b/SignalGenModel.h	Sat May 20 19:52:23 2017 +0000
@@ -0,0 +1,5 @@
+//
+//
+// In the transition to an improved architecture, this will be the interface/glue
+// between the DAC driver and the User Interface.
+//

--- a/main.cpp	Mon Jan 16 22:57:59 2017 +0000
+++ b/main.cpp	Sat May 20 19:52:23 2017 +0000
@@ -26,16 +26,6 @@
     wd.Configure(30.0);
     //ini.SetFile("/local/SigGen.ini", 2);
 
-#if 0
-    aout = 0.25;
-    wait_ms(25);
-    aout = 0.50;
-    wait_ms(25);
-    aout = 0.75;
-    wait_ms(25);
-    aout = 1.00;
-    wait_ms(25);
-#endif
     lcd.init(480,272,16, true, true, true);
     while (true)
     {