Signal Generator
Dependencies: IniManager RA8875 Watchdog mbed-rtos mbed
Fork of speaker_demo_Analog by
Diff: SignalGenDAC.cpp
- Revision:
- 4:10281ddb673d
- Parent:
- 3:d22f3e52d06a
- Child:
- 5:49dd0c647a40
diff -r d22f3e52d06a -r 10281ddb673d SignalGenDAC.cpp --- a/SignalGenDAC.cpp Mon Jan 16 04:33:06 2017 +0000 +++ b/SignalGenDAC.cpp Mon Jan 16 21:05:13 2017 +0000 @@ -1,6 +1,8 @@ #include "SignalGenDAC.h" +DigitalOut led(LED1); + #define PI 3.14159 /// The linked list structure used to control the DMA transfer @@ -26,21 +28,86 @@ SignalGenDAC::SignalGenDAC(PinName _aout, float _minV, float _maxV) : minV(_minV), maxV(_maxV) { aout = new AnalogOut(_aout); +#if 1 + #include "mbed.h" + aout->write(0.25); + wait_ms(25); + aout->write(0.50); + wait_ms(25); + aout->write(0.75); + wait_ms(25); + aout->write(1.00); + wait_ms(25); +#endif } SignalGenDAC::~SignalGenDAC() { } void SignalGenDAC::Start(bool oneShot) { - printf("Start(%d)\r\n", oneShot ? 1 : 0); - LPC_GPDMACH0->DMACCLLI = (oneShot) ? 0 : (uint32_t) &llio; + 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; + llio.control = (1<<26) | (2<<21) | (2<<18) | numSamples; + + LPC_SC->PCONP |= (1<<29); + + /* Enable GPDMA and sync logic */ + LPC_GPDMA->DMACConfig = 1; + LPC_GPDMA->DMACSync = (1<<6); + + /* Load DMA Channel0 */ + LPC_GPDMACH0->DMACCSrcAddr = (uint32_t)DACsignal; + LPC_GPDMACH0->DMACCDestAddr = (uint32_t)&LPC_DAC->DACR; + LPC_GPDMACH0->DMACCLLI = (uint32_t)&llio; // Free Running + //LPC_GPDMACH0->DMACCLLI = 0; // One-Shot + + LPC_GPDMACH0->DMACCControl = numSamples // 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 + | (2 << 21) // destination width (21 - 23) = 32 bit + | (0 << 24) // source AHB select (24) = AHB 0 + | (0 << 25) // destination AHB select (25) = AHB 0 + | (1 << 26) // source increment (26) = increment + | (0 << 27) // destination increment (27) = no increment + | (0 << 28) // mode select (28) = access in user mode + | (0 << 29) // (29) = access not bufferable + | (0 << 30) // (30) = access not cacheable + | (0 << 31); // terminal count interrupt disabled + + LPC_GPDMACH0->DMACCConfig = 1 + | (0 << 1) // source peripheral (1 - 5) = none + | (7 << 6) // destination peripheral (6 - 10) = DAC + | (1 << 11) // flow control (11 - 13) = mem to per + | (0 << 14) // (14) = mask out error interrupt + | (0 << 15) // (15) = mask out terminal count interrupt + | (0 << 16) // (16) = no locked transfers + | (0 << 18); // (27) = no HALT + + /* DACclk = 25 MHz, so 10 usec interval */ + LPC_DAC->DACCNTVAL = 20; // 16-bit reload value + /* DMA, timer running, dbuff */ + LPC_DAC->DACCTRL = + 1<<3 // DMA_ENA dma burst is enabled + | 1<<2 // CNT_ENA Timeout couner is enabled + | 1<<1; // DBLBUF_ENA double-buffering enabled } void SignalGenDAC::Stop(void) { printf("Stop()\r\n"); LPC_GPDMACH0->DMACCLLI = 0; isOn = false; + led = 0; } @@ -50,16 +117,16 @@ float mid = rangelimit(offset, minV, maxV); float low = rangelimit(offset - voltage/2, minV, maxV); float v; - int numSamples = 32; // Ideally, compute this based on the frequency for good resolution + numSamples = 32; // Ideally, compute this based on the frequency for good resolution dcCount = dutycycle/100.0 * numSamples; firstQtr = dcCount / 2; lastQtr = dcCount + (numSamples - dcCount)/2; // Set the timebased based on the frequency if (isOn) { - // stop the signal during the change - isOn = false; + Stop(); } + printf("Generate wave for mode: %d\r\n", mode); switch (mode) { case SG_SINE: for (x=0; x<numSamples; x++) { @@ -116,59 +183,10 @@ } //printf("DAC Data %3.2f %3.2f\r\n", voltage, offset); for (x=0; x<numSamples; x++) { - DACsignal[x] = ((uint16_t)(VoltSignal[x]/maxV * 1023) << 6) | (1 << 16); - //printf("%3d, %5.3f, %d\r\n", x, VoltSignal[x], DACsignal[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; - llio.control = (1<<26) | (2<<21) | (2<<18) | numSamples; - - LPC_SC->PCONP |= (1<<29); - - /* Enable GPDMA and sync logic */ - LPC_GPDMA->DMACConfig = 1; - LPC_GPDMA->DMACSync = (1<<6); - - /* Load DMA Channel0 */ - LPC_GPDMACH0->DMACCSrcAddr = (uint32_t) &DACsignal[0]; - LPC_GPDMACH0->DMACCDestAddr = (uint32_t) &LPC_DAC->DACR; - - // Free Running - LPC_GPDMACH0->DMACCLLI = (uint32_t) &llio; - // One-Shot -// LPC_GPDMACH0->DMACCLLI = 0; - - LPC_DAC->DACCNTVAL = numSamples // 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 - | (2 << 21) // destination width (21 - 23) = 32 bit - | (0 << 24) // source AHB select (24) = AHB 0 - | (0 << 25) // destination AHB select (25) = AHB 0 - | (1 << 26) // source increment (26) = increment - | (0 << 27) // destination increment (27) = no increment - | (0 << 28) // mode select (28) = access in user mode - | (0 << 29) // (29) = access not bufferable - | (0 << 30) // (30) = access not cacheable - | (0 << 31); // terminal count interrupt disabled - - LPC_GPDMA->DMACConfig = 1 - | (0 << 1) // source peripheral (1 - 5) = none - | (7 << 6) // destination peripheral (6 - 10) = DAC - | (1 << 11) // flow control (11 - 13) = mem to per - | (0 << 14) // (14) = mask out error interrupt - | (0 << 15) // (15) = mask out terminal count interrupt - | (0 << 16) // (16) = no locked transfers - | (0 << 18); // (27) = no HALT - - /* DACclk = 25 MHz, so 10 usec interval */ - LPC_DAC->DACCNTVAL = 250; // 16-bit reload value - /* DMA, timer running, dbuff */ - LPC_DAC->DACCTRL = - 1<<3 // DMA_ENA dma burst is enabled - | 1<<2 // CNT_ENA Timeout couner is enabled - | 1<<1; // DBLBUF_ENA double-buffering enabled + Start(false); } float SignalGenDAC::rangelimit(float value, float min, float max) {