Suga koubou
LPC8xx Internal Analog Comparator library
LPC8xx Internal Analog Comparator library
LPC800シリーズ（LPC812, LPC824等）に内蔵されているコンパレーター（比較器）を使うライブラリです。
使い方
初期化
ACMP acmp(vp, vn, hys, lad);
- vp = コンパレーター正入力（ACMP::LADDER / ACMP_I1～3 / BANDGAP）
- vn = コンパレーター負入力（ACMP::LADDER / ACMP_I1～3 / BANDGAP）
- hys = ヒステリシス選択（ACMP::NONE / HYS5mV / HYS10mV / HYS20mV）
- lad = 電圧ラダー選択（0～31）
コンパレーター入力に使えるピンは決まっています。（スイッチマトリクスで変更できません）
(LPC81x/82x) ACMP_I1=P0.0 / ACMP_I2=P0.1 / (LPC82x) ACMP_I3=P0.14 / ACMP_I4=P0.23
読み取り
acmp.read();
- 返り値
- 1: vp > vn
- 0: vp < vn
割込み
acmp.rise(*func);
- vp > vn を検出した時 func を呼び出す
acmp.fall(*func);
- vp < vn を検出した時 func を呼び出す
Sample
Revision 0:6ad2528ba3cc, committed 2015-11-16
- Comitter:
- okini3939
- Date:
- Mon Nov 16 03:45:24 2015 +0000
- Commit message:
- 1st build
Changed in this revision
| ACMP.cpp | Show annotated file Show diff for this revision Revisions of this file |
| ACMP.h | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/ACMP.cpp Mon Nov 16 03:45:24 2015 +0000
@@ -0,0 +1,79 @@
+/**
+ * LPC8xx Internal Analog Comparator library for mbed
+ * Copyright (c) 2015 Suga
+ * Released under the MIT License: http://mbed.org/license/mit
+ */
+/** @file
+ * @brief LPC8xx Internal Analog Comparator library for mbed
+ */
+
+#include "ACMP.h"
+
+ACMP *ACMP::_acmp;
+
+ACMP::ACMP (VSEL vp, VSEL vn, HYS hys, int lad) {
+
+ _acmp = this;
+
+ LPC_SYSCON->PDRUNCFG &= ~(1<<3); // Enable power to BOD block
+ LPC_SYSCON->PDRUNCFG &= ~(1<<15); // Enable power to CMP block
+ LPC_SYSCON->SYSAHBCLKCTRL |= (1<<19); // Enable clock to CMP block
+ LPC_SYSCON->PRESETCTRL &= ~(1<<12); // reset CMP
+ LPC_SYSCON->PRESETCTRL |= (1<<12);
+
+ if (vp == ACMP_I1 || vn == ACMP_I1) {
+ LPC_SYSCON->SYSAHBCLKCTRL |= (1<<7)|(1<<6); // enable clock for SWM, GPIO
+ LPC_IOCON->PIO0_0 &= ~(3<<3); // no pull up/down
+ LPC_GPIO_PORT->DIR0 &= ~(1<<0); // configure GPIO as input
+ LPC_SWM->PINENABLE0 &= ~(1<<0); // P0.0 is ACMP_I1
+
+ }
+ if (vp == ACMP_I2 || vn == ACMP_I2) {
+ LPC_SYSCON->SYSAHBCLKCTRL |= (1<<7)|(1<<6); // enable clock for SWM, GPIO
+ LPC_IOCON->PIO0_1 &= ~(3<<3); // no pull up/down
+ LPC_GPIO_PORT->DIR0 &= ~(1<<1); // configure GPIO as input
+ LPC_SWM->PINENABLE0 &= ~(1<<1); // P0.1 is ACMP_I2
+ }
+#if defined(TARGET_LPC82X)
+ if (vp == ACMP_I3 || vn == ACMP_I3) {
+ LPC_SYSCON->SYSAHBCLKCTRL |= (1<<7)|(1<<6); // enable clock for SWM, GPIO
+ LPC_IOCON->PIO0_14 &= ~(3<<3); // no pull up/down
+ LPC_GPIO_PORT->DIR0 &= ~(1<<14); // configure GPIO as input
+ LPC_SWM->PINENABLE0 &= ~(1<<2); // P0.14 is ACMP_I3
+ }
+ if (vp == ACMP_I4 || vn == ACMP_I4) {
+ LPC_SYSCON->SYSAHBCLKCTRL |= (1<<7)|(1<<6); // enable clock for SWM, GPIO
+ LPC_IOCON->PIO0_23 &= ~(3<<3); // no pull up/down
+ LPC_GPIO_PORT->DIR0 &= ~(1<<23); // configure GPIO as input
+ LPC_SWM->PINENABLE0 &= ~(1<<3); // P0.23 is ACMP_I4
+ }
+#endif
+ if (lad >= 0) {
+ LPC_CMP->LAD = ((lad & 0x1f) << 1) | (1<<0); // Vref=VDD
+ }
+
+ LPC_CMP->CTRL = (hys << 25) | (vn << 11)| (vp << 8) | (2 << 3); // Both edges
+
+ LPC_CMP->CTRL |= (1<<20); // EDGECLR
+ LPC_CMP->CTRL &= ~(1<<20); // EDGECLR
+ NVIC_EnableIRQ(CMP_IRQn);
+}
+
+extern "C"
+void CMP_IRQHandler (void) {
+ ACMP::_acmp->isrAcmp();
+}
+
+void ACMP::isrAcmp () {
+ if (read()) {
+ _rise.call();
+ } else {
+ _fall.call();
+ }
+ LPC_CMP->CTRL |= (1<<20); // EDGECLR
+ LPC_CMP->CTRL &= ~(1<<20); // EDGECLR
+}
+
+int ACMP::read () {
+ return LPC_CMP->CTRL & (1<<21) ? 1 : 0;
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/ACMP.h Mon Nov 16 03:45:24 2015 +0000
@@ -0,0 +1,82 @@
+/**
+ * LPC8xx Internal Analog Comparator library for mbed
+ * Copyright (c) 2015 Suga
+ * Released under the MIT License: http://mbed.org/license/mit
+ */
+/** @file
+ * @brief LPC8xx Internal Analog Comparator library for mbed
+ */
+
+#ifndef _ACMP_H_
+#define _ACMP_H_
+
+#include "mbed.h"
+
+#if !defined(TARGET_LPC81X) && !defined(TARGET_LPC82X)
+#error "supported for LPC8xx"
+#endif
+
+/** ACMP class
+ */
+class ACMP {
+public:
+ enum VSEL {
+ LADDER = 0, // voltage ladder
+ ACMP_I1 = 1, // P0.0
+ ACMP_I2 = 2, // P0.1
+#if defined(TARGET_LPC81X)
+ BANDGAP = 6,
+#elif defined(TARGET_LPC82X)
+ ACMP_I3 = 3, // P0.14
+ ACMP_I4 = 4, // P0.23
+ BANDGAP = 5,
+ ADC_0 = 6,
+#endif
+ };
+ enum HYS {
+ NONE = 0,
+ HYS5mV = 1,
+ HYS10mV = 2,
+ HYS20mV = 3,
+ };
+
+ static ACMP *_acmp;
+
+ /**
+ * @param ain1 Selects positive voltage input
+ * @param ain2 Selects negative voltage input
+ * @param hys Selects hysteresis of the comparator
+ * @param lad Selects voltage ladder (0-31)
+ */
+ ACMP (VSEL ain1, VSEL ain2, HYS hys = NONE, int lad = -1);
+
+ void isrAcmp ();
+
+ int read ();
+
+ void rise (void(*fptr)() = NULL) {
+ _rise.attach(fptr);
+ }
+ template<typename T>
+ void rise (T* tptr, void (T::*mptr)()) {
+ if ((mptr != NULL) && (tptr != NULL)) {
+ _rise.attach(tptr, mptr);
+ }
+ }
+
+ void fall (void(*fptr)() = NULL) {
+ _fall.attach(fptr);
+ }
+ template<typename T>
+ void fall (T* tptr, void (T::*mptr)()) {
+ if ((mptr != NULL) && (tptr != NULL)) {
+ _fall.attach(tptr, mptr);
+ }
+ }
+
+protected:
+ FunctionPointer _rise, _fall;
+
+};
+
+#endif