Norimasa Okamoto / Mbed 2 deprecated lpc800-max-RGB

LPC800-MAX RGB demo using SCT and MRT

LPC800-MAX RGB demo using State-Configurable Timer(SCT) and Multi-Rate Timer(MRT).
http://www.youtube.com/watch?v=PABxoWZB0YM

SCT_PWM.cpp@1:4e19f154ec21, 2013-10-14 (annotated)

Committer:
va009039
Date:
Mon Oct 14 03:59:30 2013 +0000
Revision:
1:4e19f154ec21
first commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
va009039 1:4e19f154ec21 1 #include "SCT_PWM.h"
va009039 1:4e19f154ec21 2
va009039 1:4e19f154ec21 3 #define BIT_ON(A) (1<<A)
va009039 1:4e19f154ec21 4
va009039 1:4e19f154ec21 5 // http://www.lpcware.com/content/nxpfile/lpc80-sct-cookbook-and-tutorial-code-examples
va009039 1:4e19f154ec21 6
va009039 1:4e19f154ec21 7 SCT_PWM::SCT_PWM(int pin, int channel) : ch(channel)
va009039 1:4e19f154ec21 8 {
va009039 1:4e19f154ec21 9 static bool insted = false;
va009039 1:4e19f154ec21 10
va009039 1:4e19f154ec21 11 if (!insted) {
va009039 1:4e19f154ec21 12 inst();
va009039 1:4e19f154ec21 13 insted = true;
va009039 1:4e19f154ec21 14 }
va009039 1:4e19f154ec21 15 swm(pin);
va009039 1:4e19f154ec21 16
va009039 1:4e19f154ec21 17 LPC_SCT->EVENT[ch + 1].STATE = LPC_SCT->EVENT[0].STATE;
va009039 1:4e19f154ec21 18 LPC_SCT->EVENT[ch + 1].CTRL = LPC_SCT->EVENT[0].CTRL | (ch+1)<<0; // match 1...5
va009039 1:4e19f154ec21 19
va009039 1:4e19f154ec21 20 LPC_SCT->OUT[ch].SET = BIT_ON(0); // event 0
va009039 1:4e19f154ec21 21 LPC_SCT->OUT[ch].CLR = BIT_ON(ch+1); // event 1...5
va009039 1:4e19f154ec21 22 }
va009039 1:4e19f154ec21 23
va009039 1:4e19f154ec21 24 void SCT_PWM::inst()
va009039 1:4e19f154ec21 25 {
va009039 1:4e19f154ec21 26 LPC_SYSCON->SYSAHBCLKCTRL |= (1<<8); // enable SCT
va009039 1:4e19f154ec21 27 LPC_SYSCON->PRESETCTRL |= (1<<8); // reset SCT
va009039 1:4e19f154ec21 28
va009039 1:4e19f154ec21 29 LPC_SCT->EVENT[0].STATE = BIT_ON(0); // state 0
va009039 1:4e19f154ec21 30 LPC_SCT->EVENT[0].CTRL = (1<<12) | (1<<14);
va009039 1:4e19f154ec21 31
va009039 1:4e19f154ec21 32 LPC_SCT->LIMIT_L |= BIT_ON(0); // event 0
va009039 1:4e19f154ec21 33
va009039 1:4e19f154ec21 34 LPC_SCT->CONFIG |= (1<<0) | (1<<17); // unify, auto limit
va009039 1:4e19f154ec21 35 LPC_SCT->CTRL_L |= (SystemCoreClock/1000000-1)<<5; // set prescaler, SCT clock = 1 MHz
va009039 1:4e19f154ec21 36
va009039 1:4e19f154ec21 37 LPC_SCT->CTRL_L &= ~(1<<2); // unhalt it by clearing bit 2 of CTRL reg
va009039 1:4e19f154ec21 38 }
va009039 1:4e19f154ec21 39
va009039 1:4e19f154ec21 40 void SCT_PWM::swm(int pin)
va009039 1:4e19f154ec21 41 {
va009039 1:4e19f154ec21 42 switch(ch) {
va009039 1:4e19f154ec21 43 case 0: // CTOUT_0
va009039 1:4e19f154ec21 44 LPC_SWM->PINASSIGN6 = (LPC_SWM->PINASSIGN6 & 0x00ffffff) | pin<<24;
va009039 1:4e19f154ec21 45 break;
va009039 1:4e19f154ec21 46 case 1: // CTOUT_1
va009039 1:4e19f154ec21 47 LPC_SWM->PINASSIGN7 = (LPC_SWM->PINASSIGN7 & 0xffffff00) | pin<<0;
va009039 1:4e19f154ec21 48 break;
va009039 1:4e19f154ec21 49 case 2: // CTOUT_2
va009039 1:4e19f154ec21 50 LPC_SWM->PINASSIGN7 = (LPC_SWM->PINASSIGN7 & 0xffff00ff) | pin<<8;
va009039 1:4e19f154ec21 51 break;
va009039 1:4e19f154ec21 52 case 3: // CTOUT_3
va009039 1:4e19f154ec21 53 LPC_SWM->PINASSIGN7 = (LPC_SWM->PINASSIGN7 & 0xff00ffff) | pin<<16;
va009039 1:4e19f154ec21 54 break;
va009039 1:4e19f154ec21 55 }
va009039 1:4e19f154ec21 56 }
va009039 1:4e19f154ec21 57
va009039 1:4e19f154ec21 58 void SCT_PWM::period(float seconds)
va009039 1:4e19f154ec21 59 {
va009039 1:4e19f154ec21 60 period_us(seconds * 1000000);
va009039 1:4e19f154ec21 61 }
va009039 1:4e19f154ec21 62
va009039 1:4e19f154ec21 63 void SCT_PWM::period_ms(int ms)
va009039 1:4e19f154ec21 64 {
va009039 1:4e19f154ec21 65 period_us(ms * 1000);
va009039 1:4e19f154ec21 66 }
va009039 1:4e19f154ec21 67
va009039 1:4e19f154ec21 68 void SCT_PWM::period_us(int us)
va009039 1:4e19f154ec21 69 {
va009039 1:4e19f154ec21 70 LPC_SCT->MATCHREL[0].U = us - 1;
va009039 1:4e19f154ec21 71 }
va009039 1:4e19f154ec21 72
va009039 1:4e19f154ec21 73 void SCT_PWM::pulsewidth(float seconds)
va009039 1:4e19f154ec21 74 {
va009039 1:4e19f154ec21 75 pulsewidth_us(seconds * 1000000);
va009039 1:4e19f154ec21 76 }
va009039 1:4e19f154ec21 77
va009039 1:4e19f154ec21 78 void SCT_PWM::pulsewidth_ms(int ms)
va009039 1:4e19f154ec21 79 {
va009039 1:4e19f154ec21 80 pulsewidth_us(ms * 1000);
va009039 1:4e19f154ec21 81 }
va009039 1:4e19f154ec21 82
va009039 1:4e19f154ec21 83 void SCT_PWM::pulsewidth_us(int us)
va009039 1:4e19f154ec21 84 {
va009039 1:4e19f154ec21 85 LPC_SCT->MATCHREL[ch + 1].U = us;
va009039 1:4e19f154ec21 86 }
va009039 1:4e19f154ec21 87
va009039 1:4e19f154ec21 88 void SCT_PWM::write(float value)
va009039 1:4e19f154ec21 89 {
va009039 1:4e19f154ec21 90 LPC_SCT->MATCHREL[ch + 1].U = value * LPC_SCT->MATCHREL[0].U;
va009039 1:4e19f154ec21 91 }
va009039 1:4e19f154ec21 92
va009039 1:4e19f154ec21 93 float SCT_PWM::read()
va009039 1:4e19f154ec21 94 {
va009039 1:4e19f154ec21 95 if (LPC_SCT->MATCHREL[0].U == 0) {
va009039 1:4e19f154ec21 96 return 0.0;
va009039 1:4e19f154ec21 97 }
va009039 1:4e19f154ec21 98 return (float)LPC_SCT->MATCHREL[ch + 1].U / LPC_SCT->MATCHREL[0].U;
va009039 1:4e19f154ec21 99 }