Revision 1:4e19f154ec21, committed 2013-10-14

Comitter:

va009039

Date:

Mon Oct 14 03:59:30 2013 +0000

Parent:

0:f86c572491c3

Commit message:

first commit

Changed in this revision

diff -r f86c572491c3 -r 4e19f154ec21 MRT.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MRT.cpp	Mon Oct 14 03:59:30 2013 +0000
@@ -0,0 +1,53 @@
+#include "MRT.h"
+
+MRT::MRT(int channel)
+{
+    static bool insted = false;
+
+    if (!insted) {
+        inst();
+        insted = true;
+    }
+
+    _ch = &LPC_MRT->Channel[channel];
+    _ch->CTRL |= (1<<1); // one-shot
+}
+
+void MRT::inst()
+{
+    LPC_SYSCON->SYSAHBCLKCTRL |= (1<<10); // enable MRT
+    LPC_SYSCON->PRESETCTRL |= (1<<7); // reset MRT
+    us_clk = SystemCoreClock / 1000000;
+}
+
+void MRT::write(uint32_t interval)
+{
+    _ch->INTVAL = interval | (1<<31); // and LOAD
+    _ch->STAT |= 0x01;
+}
+
+int MRT::status()
+{
+    return (_ch->STAT & 1) ? IDLE : RUNNING;
+}
+
+void MRT::wait_ms(uint32_t timeout_ms)
+{
+    wait_raw(us_clk * 1000 * timeout_ms);
+}
+
+void MRT::wait_us(uint32_t timeout_us)
+{
+    wait_raw(us_clk * timeout_us);
+}
+
+void MRT::wait_raw(uint32_t timeout)
+{
+    write(timeout);
+    while(status() == RUNNING);
+}
+
+uint32_t MRT::read()
+{
+     return _ch->TIMER;
+}

diff -r f86c572491c3 -r 4e19f154ec21 MRT.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MRT.h	Mon Oct 14 03:59:30 2013 +0000
@@ -0,0 +1,26 @@
+#pragma once
+#include "LPC8xx.h"
+
+class MRT {
+public:
+    MRT(int channel = 0);
+    /** write down counter
+     * @param interval start count
+     */
+    void write(uint32_t interval);
+    /** read down counter
+     */
+    uint32_t read();
+    enum STAT {
+        IDLE,
+        RUNNING,
+    };
+    int status();
+    void wait_ms(uint32_t timeout_ms);
+    void wait_us(uint32_t timeout_us);
+    void wait_raw(uint32_t timeout);
+protected:
+    void inst();
+    MRT_Channel_cfg_Type* _ch;
+    int us_clk;
+};

diff -r f86c572491c3 -r 4e19f154ec21 SCT_PWM.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SCT_PWM.cpp	Mon Oct 14 03:59:30 2013 +0000
@@ -0,0 +1,99 @@
+#include "SCT_PWM.h"
+
+#define BIT_ON(A) (1<<A)
+
+// http://www.lpcware.com/content/nxpfile/lpc80-sct-cookbook-and-tutorial-code-examples
+
+SCT_PWM::SCT_PWM(int pin, int channel) : ch(channel)
+{
+    static bool insted = false;
+
+    if (!insted) {
+        inst();
+        insted = true;
+    }
+    swm(pin);
+
+    LPC_SCT->EVENT[ch + 1].STATE = LPC_SCT->EVENT[0].STATE;
+    LPC_SCT->EVENT[ch + 1].CTRL = LPC_SCT->EVENT[0].CTRL | (ch+1)<<0; // match 1...5
+
+    LPC_SCT->OUT[ch].SET = BIT_ON(0); // event 0
+    LPC_SCT->OUT[ch].CLR = BIT_ON(ch+1); // event 1...5
+}
+
+void SCT_PWM::inst()
+{
+    LPC_SYSCON->SYSAHBCLKCTRL |= (1<<8); // enable SCT
+    LPC_SYSCON->PRESETCTRL |= (1<<8); // reset SCT
+
+    LPC_SCT->EVENT[0].STATE = BIT_ON(0); // state 0
+    LPC_SCT->EVENT[0].CTRL = (1<<12) | (1<<14);
+
+    LPC_SCT->LIMIT_L |= BIT_ON(0); // event 0
+
+    LPC_SCT->CONFIG |= (1<<0) | (1<<17); // unify, auto limit
+    LPC_SCT->CTRL_L |= (SystemCoreClock/1000000-1)<<5; // set prescaler, SCT clock = 1 MHz
+
+    LPC_SCT->CTRL_L &= ~(1<<2); // unhalt it by clearing bit 2 of CTRL reg
+}
+
+void SCT_PWM::swm(int pin)
+{
+    switch(ch) {
+        case 0: // CTOUT_0
+            LPC_SWM->PINASSIGN6 = (LPC_SWM->PINASSIGN6 & 0x00ffffff) | pin<<24;
+            break;
+        case 1: // CTOUT_1
+            LPC_SWM->PINASSIGN7 = (LPC_SWM->PINASSIGN7 & 0xffffff00) | pin<<0;
+            break;
+        case 2: // CTOUT_2
+            LPC_SWM->PINASSIGN7 = (LPC_SWM->PINASSIGN7 & 0xffff00ff) | pin<<8;
+            break;
+        case 3: // CTOUT_3
+            LPC_SWM->PINASSIGN7 = (LPC_SWM->PINASSIGN7 & 0xff00ffff) | pin<<16;
+            break;
+    }
+}
+
+void SCT_PWM::period(float seconds)
+{
+    period_us(seconds * 1000000);
+}
+
+void SCT_PWM::period_ms(int ms)
+{
+    period_us(ms * 1000);
+}
+
+void SCT_PWM::period_us(int us)
+{
+    LPC_SCT->MATCHREL[0].U = us - 1;
+}
+
+void SCT_PWM::pulsewidth(float seconds)
+{
+    pulsewidth_us(seconds * 1000000);
+}
+
+void SCT_PWM::pulsewidth_ms(int ms)
+{
+    pulsewidth_us(ms * 1000);
+}
+
+void SCT_PWM::pulsewidth_us(int us)
+{
+    LPC_SCT->MATCHREL[ch + 1].U = us;
+}
+
+void SCT_PWM::write(float value)
+{
+    LPC_SCT->MATCHREL[ch + 1].U = value * LPC_SCT->MATCHREL[0].U;
+}
+
+float SCT_PWM::read()
+{
+    if (LPC_SCT->MATCHREL[0].U == 0) {
+        return 0.0;
+    }
+    return (float)LPC_SCT->MATCHREL[ch + 1].U / LPC_SCT->MATCHREL[0].U;
+}

diff -r f86c572491c3 -r 4e19f154ec21 SCT_PWM.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SCT_PWM.h	Mon Oct 14 03:59:30 2013 +0000
@@ -0,0 +1,30 @@
+#pragma once
+#include "LPC8xx.h"
+
+class SCT_PWM {
+public:
+    SCT_PWM(int pin = 7, int channel = 0);
+    void period(float seconds);
+    void period_ms(int ms);
+    void period_us(int us);
+    void pulsewidth(float seconds);
+    void pulsewidth_ms(int ms);
+    void pulsewidth_us(int us);
+    void write(float value);
+    float read();
+    void swm(int pin = 7);
+
+    SCT_PWM& operator= (float value) {
+        write(value);
+        return *this;
+    }
+
+    SCT_PWM& operator= (SCT_PWM& rhs) {
+        write(rhs.read());
+        return *this;
+    }
+
+protected:
+    void inst();
+    int ch;
+};

diff -r f86c572491c3 -r 4e19f154ec21 main.cpp
--- a/main.cpp	Mon Oct 15 12:19:12 2012 +0000
+++ b/main.cpp	Mon Oct 14 03:59:30 2013 +0000
@@ -1,3 +1,29 @@
+#ifdef TARGET_LPC812
+#include "mbed.h"
+#include "SCT_PWM.h"
+#include "MRT.h"
+
+SCT_PWM r (LED_RED, 0);
+SCT_PWM g (LED_GREEN, 1);
+SCT_PWM b (LED_BLUE, 2);
+
+int main()
+{
+    MRT* mrt = new MRT();
+    r.period(0.001);
+    while(1) {
+        for(float i = 0.0; i < 1.0 ; i += 0.001) {
+            float p = 3 * i;
+            r = 1.0 - ((p < 1.0) ? 1.0 - p : (p > 2.0) ? p - 2.0 : 0.0);
+            g = 1.0 - ((p < 1.0) ? p : (p > 2.0) ? 0.0 : 2.0 - p);
+            b = 1.0 - ((p < 1.0) ? 0.0 : (p > 2.0) ? 3.0 - p : p - 1.0);  ;  
+            mrt->wait_ms(10);
+        }
+    }
+}
+
+#else
+// http://mbed.org/users/chris/code/app-board-RGB/
 #include "mbed.h"
 
 PwmOut r (p23);
@@ -16,4 +42,5 @@
             wait (0.01);
         }
     }
-}
\ No newline at end of file
+}
+#endif

diff -r f86c572491c3 -r 4e19f154ec21 mbed.bld
--- a/mbed.bld	Mon Oct 15 12:19:12 2012 +0000
+++ b/mbed.bld	Mon Oct 14 03:59:30 2013 +0000
@@ -1,1 +1,1 @@
-http://mbed.org/users/mbed_official/code/mbed/builds/cd19af002ccc
\ No newline at end of file
+http://mbed.org/users/mbed_official/code/mbed/builds/a9913a65894f
\ No newline at end of file