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
Diff: ACMP.cpp
- Revision:
- 0:6ad2528ba3cc
--- /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; +}