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
Import programACMP_sample
LPC8xx Internal Analog Comparator
ACMP.cpp
- Committer:
- okini3939
- Date:
- 2015-11-16
- Revision:
- 0:6ad2528ba3cc
File content as of revision 0:6ad2528ba3cc:
/** * 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; }