Suga koubou / ACMP

LPC8xx Internal Analog Comparator library

Dependents:   ACMP_sample

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

Import programACMP_sample

LPC8xx Internal Analog Comparator

Last commit 16 Nov 2015 by Suga koubou

ACMP.cpp@0:6ad2528ba3cc, 2015-11-16 (annotated)

Committer:
okini3939
Date:
Mon Nov 16 03:45:24 2015 +0000
Revision:
0:6ad2528ba3cc
1st build

Who changed what in which revision?

UserRevisionLine numberNew contents of line
okini3939 0:6ad2528ba3cc 1 /**
okini3939 0:6ad2528ba3cc 2 * LPC8xx Internal Analog Comparator library for mbed
okini3939 0:6ad2528ba3cc 3 * Copyright (c) 2015 Suga
okini3939 0:6ad2528ba3cc 4 * Released under the MIT License: http://mbed.org/license/mit
okini3939 0:6ad2528ba3cc 5 */
okini3939 0:6ad2528ba3cc 6 /** @file
okini3939 0:6ad2528ba3cc 7 * @brief LPC8xx Internal Analog Comparator library for mbed
okini3939 0:6ad2528ba3cc 8 */
okini3939 0:6ad2528ba3cc 9
okini3939 0:6ad2528ba3cc 10 #include "ACMP.h"
okini3939 0:6ad2528ba3cc 11
okini3939 0:6ad2528ba3cc 12 ACMP *ACMP::_acmp;
okini3939 0:6ad2528ba3cc 13
okini3939 0:6ad2528ba3cc 14 ACMP::ACMP (VSEL vp, VSEL vn, HYS hys, int lad) {
okini3939 0:6ad2528ba3cc 15
okini3939 0:6ad2528ba3cc 16 _acmp = this;
okini3939 0:6ad2528ba3cc 17
okini3939 0:6ad2528ba3cc 18 LPC_SYSCON->PDRUNCFG &= ~(1<<3); // Enable power to BOD block
okini3939 0:6ad2528ba3cc 19 LPC_SYSCON->PDRUNCFG &= ~(1<<15); // Enable power to CMP block
okini3939 0:6ad2528ba3cc 20 LPC_SYSCON->SYSAHBCLKCTRL |= (1<<19); // Enable clock to CMP block
okini3939 0:6ad2528ba3cc 21 LPC_SYSCON->PRESETCTRL &= ~(1<<12); // reset CMP
okini3939 0:6ad2528ba3cc 22 LPC_SYSCON->PRESETCTRL |= (1<<12);
okini3939 0:6ad2528ba3cc 23
okini3939 0:6ad2528ba3cc 24 if (vp == ACMP_I1 || vn == ACMP_I1) {
okini3939 0:6ad2528ba3cc 25 LPC_SYSCON->SYSAHBCLKCTRL |= (1<<7)|(1<<6); // enable clock for SWM, GPIO
okini3939 0:6ad2528ba3cc 26 LPC_IOCON->PIO0_0 &= ~(3<<3); // no pull up/down
okini3939 0:6ad2528ba3cc 27 LPC_GPIO_PORT->DIR0 &= ~(1<<0); // configure GPIO as input
okini3939 0:6ad2528ba3cc 28 LPC_SWM->PINENABLE0 &= ~(1<<0); // P0.0 is ACMP_I1
okini3939 0:6ad2528ba3cc 29
okini3939 0:6ad2528ba3cc 30 }
okini3939 0:6ad2528ba3cc 31 if (vp == ACMP_I2 || vn == ACMP_I2) {
okini3939 0:6ad2528ba3cc 32 LPC_SYSCON->SYSAHBCLKCTRL |= (1<<7)|(1<<6); // enable clock for SWM, GPIO
okini3939 0:6ad2528ba3cc 33 LPC_IOCON->PIO0_1 &= ~(3<<3); // no pull up/down
okini3939 0:6ad2528ba3cc 34 LPC_GPIO_PORT->DIR0 &= ~(1<<1); // configure GPIO as input
okini3939 0:6ad2528ba3cc 35 LPC_SWM->PINENABLE0 &= ~(1<<1); // P0.1 is ACMP_I2
okini3939 0:6ad2528ba3cc 36 }
okini3939 0:6ad2528ba3cc 37 #if defined(TARGET_LPC82X)
okini3939 0:6ad2528ba3cc 38 if (vp == ACMP_I3 || vn == ACMP_I3) {
okini3939 0:6ad2528ba3cc 39 LPC_SYSCON->SYSAHBCLKCTRL |= (1<<7)|(1<<6); // enable clock for SWM, GPIO
okini3939 0:6ad2528ba3cc 40 LPC_IOCON->PIO0_14 &= ~(3<<3); // no pull up/down
okini3939 0:6ad2528ba3cc 41 LPC_GPIO_PORT->DIR0 &= ~(1<<14); // configure GPIO as input
okini3939 0:6ad2528ba3cc 42 LPC_SWM->PINENABLE0 &= ~(1<<2); // P0.14 is ACMP_I3
okini3939 0:6ad2528ba3cc 43 }
okini3939 0:6ad2528ba3cc 44 if (vp == ACMP_I4 || vn == ACMP_I4) {
okini3939 0:6ad2528ba3cc 45 LPC_SYSCON->SYSAHBCLKCTRL |= (1<<7)|(1<<6); // enable clock for SWM, GPIO
okini3939 0:6ad2528ba3cc 46 LPC_IOCON->PIO0_23 &= ~(3<<3); // no pull up/down
okini3939 0:6ad2528ba3cc 47 LPC_GPIO_PORT->DIR0 &= ~(1<<23); // configure GPIO as input
okini3939 0:6ad2528ba3cc 48 LPC_SWM->PINENABLE0 &= ~(1<<3); // P0.23 is ACMP_I4
okini3939 0:6ad2528ba3cc 49 }
okini3939 0:6ad2528ba3cc 50 #endif
okini3939 0:6ad2528ba3cc 51 if (lad >= 0) {
okini3939 0:6ad2528ba3cc 52 LPC_CMP->LAD = ((lad & 0x1f) << 1) | (1<<0); // Vref=VDD
okini3939 0:6ad2528ba3cc 53 }
okini3939 0:6ad2528ba3cc 54
okini3939 0:6ad2528ba3cc 55 LPC_CMP->CTRL = (hys << 25) | (vn << 11)| (vp << 8) | (2 << 3); // Both edges
okini3939 0:6ad2528ba3cc 56
okini3939 0:6ad2528ba3cc 57 LPC_CMP->CTRL |= (1<<20); // EDGECLR
okini3939 0:6ad2528ba3cc 58 LPC_CMP->CTRL &= ~(1<<20); // EDGECLR
okini3939 0:6ad2528ba3cc 59 NVIC_EnableIRQ(CMP_IRQn);
okini3939 0:6ad2528ba3cc 60 }
okini3939 0:6ad2528ba3cc 61
okini3939 0:6ad2528ba3cc 62 extern "C"
okini3939 0:6ad2528ba3cc 63 void CMP_IRQHandler (void) {
okini3939 0:6ad2528ba3cc 64 ACMP::_acmp->isrAcmp();
okini3939 0:6ad2528ba3cc 65 }
okini3939 0:6ad2528ba3cc 66
okini3939 0:6ad2528ba3cc 67 void ACMP::isrAcmp () {
okini3939 0:6ad2528ba3cc 68 if (read()) {
okini3939 0:6ad2528ba3cc 69 _rise.call();
okini3939 0:6ad2528ba3cc 70 } else {
okini3939 0:6ad2528ba3cc 71 _fall.call();
okini3939 0:6ad2528ba3cc 72 }
okini3939 0:6ad2528ba3cc 73 LPC_CMP->CTRL |= (1<<20); // EDGECLR
okini3939 0:6ad2528ba3cc 74 LPC_CMP->CTRL &= ~(1<<20); // EDGECLR
okini3939 0:6ad2528ba3cc 75 }
okini3939 0:6ad2528ba3cc 76
okini3939 0:6ad2528ba3cc 77 int ACMP::read () {
okini3939 0:6ad2528ba3cc 78 return LPC_CMP->CTRL & (1<<21) ? 1 : 0;
okini3939 0:6ad2528ba3cc 79 }