Tobias Wulf / PwmDAC

PwmDAC is a library to run more the one PWM channel and channel updates at the time. Maximum PWM frequency is 48MHz. You can use for in example for rgb applications or as a multi channel dac with connected active lowpass. Written for mbed LPC1768. Not completly tested. I will upload my results as soon as possible. Although some deeper informations and LTSpice simulations

Dependents:   DiscoTech filter_implement

Files at this revision

API Documentation at this revision

Revision 1:381bd99d10a4, committed 2013-09-21

Comitter:
flash_ahaa
Date:
Sat Sep 21 08:47:27 2013 +0000
Parent:
0:13e0b9ea312f
Commit message:
Remove update LER from for loop. Put update command after for loop and set all at once.

Changed in this revision

PwmDAC.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/PwmDAC.cpp	Sun Sep 15 22:20:47 2013 +0000
+++ b/PwmDAC.cpp	Sat Sep 21 08:47:27 2013 +0000
@@ -43,9 +43,9 @@
     
     for(int i = 1; i < 7; i++) {                                            // update ch. 1-6
         *MR[i] = 0;
-        LPC_PWM1->LER |= (1 << i);
     }
-    
+    LPC_PWM1->LER |= (0x3F << 1);
+        
     LPC_PWM1->TCR |= (1 << 3) | (1 << 0);                                   // enable PWM and Timer (PWM unit)
                                                                             // ==> output update from MR1-6 are load and
                                                                             // enabled with LPC_PWM1->LER Bit 6:1 set to "1"
@@ -113,9 +113,9 @@
             _pulsewidth[i] = duty[i] / 100.0 * _period;
             _steps[i] = (uint32_t) ((double) SYS_CLK * _pulsewidth[i]);
             *MR[i+1] = _steps[i];
-            LPC_PWM1->LER |= (1 << (i+1));
         }
-    }    
+    }
+    LPC_PWM1->LER |= (0x3F << 1);    
 }
 
 void PwmDAC::updatePulsewidth(double pulsewidth[]) {
@@ -125,9 +125,9 @@
             _pulsewidth[i] = pulsewidth[i];
             _steps[i] = (uint32_t) ((double) SYS_CLK * pulsewidth[i]);
             *MR[i+1] = _steps[i];
-            LPC_PWM1->LER |= (1 << (i+1));
         }
-    }    
+    }
+    LPC_PWM1->LER |= (0x3F << 1);
 }
     
 void PwmDAC::updateSteps(uint32_t steps[]) {
@@ -137,21 +137,21 @@
             _pulsewidth[i] = _duty[i] * _period;
             _steps[i] = steps[i];
             *MR[i+1] = steps[i];
-            LPC_PWM1->LER |= (1 << (i+1));
         }
-    }    
+    }
+    LPC_PWM1->LER |= (0x3F << 1);    
 }
 
 void PwmDAC::stop() {
     for(int i = 0; i < 6; i++) {
         *MR[i+1] = 0;
-        LPC_PWM1->LER |= (1 << (i+1));
     }    
+    LPC_PWM1->LER |= (0x3F << 1);
 }
 
 void PwmDAC::start() {
     for(int i = 0; i < 6; i++) {
         *MR[i+1] = _steps[i];
-        LPC_PWM1->LER |= (1 << (i+1));
-    }    
+    }
+    LPC_PWM1->LER |= (0x3F << 1);   
 }
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