Stm8s定時(shí)器TIM1的編碼模式與旋轉(zhuǎn)開(kāi)關(guān)的接口

1、Stm8s定時(shí)器TIM1的編碼模式與旋轉(zhuǎn)開(kāi)關(guān)的接口Stm8s只有定時(shí)器一有編碼模式，硬件根據(jù)兩個(gè)通道CH1和CH2進(jìn)來(lái)相位的關(guān)系，計(jì)數(shù)器自動(dòng)加減。不需要再通過(guò)外部中斷來(lái)進(jìn)行旋轉(zhuǎn)編碼。一共有三種工作模式。1.計(jì)數(shù)器只在TI2的邊沿計(jì)數(shù)，則置TIMx_SMCR寄存器中的SMS=001;2.只在TI1邊沿計(jì)數(shù)，則置SMS=010;3.計(jì)數(shù)器同時(shí)在TI1和TI2邊沿計(jì)數(shù)，則置SMS=011。代碼CLK-PCKENR1|=0X80;/開(kāi)啟time1時(shí)鐘TIM1-SMCR|=0X02;工作在編碼器模式2TIM1-CCMR1|=0X1;/IC1FP1映射到TI1)TIM1-CCMR2|=0X1;/IC2FP

2、2映射到TI2CC2MAPTI2FP2CH2TIM1-ARRH=0XEA;/60000產(chǎn)生溢出最大65535TIM1-ARRL=0X60;TIM1-IER|=0X1;開(kāi)中斷，開(kāi)中斷前要有中斷處理程序，中斷里需要清除中斷標(biāo)志位TIM1-CNTRH=0 xea;/我要有個(gè)大的初始化值TIM1-CNTRL=0 x56;TIM1-CR1=0X01;啟動(dòng)計(jì)數(shù)中斷處理程序#pragmavector=0 x0d_interruptvoidTIM1_UPD_OVF_TRG_BRK_IRQHandler(void)TIM1_ClearITPendingBit(TIM1_IT_UPDATE);if(TIM1-CR

3、1&0 x10)!=0)count2-;elsecount2+;當(dāng)計(jì)數(shù)寄存器(TIM1_CNTR)里的計(jì)數(shù)值到由TIM1-ARR至U0時(shí),開(kāi)中斷的話，會(huì)產(chǎn)生溢出中斷，根據(jù)讀TIM1-CR1里的DIR位可以讀出方向，DIR位等于1向下計(jì)數(shù)，DIR等于0向上計(jì)數(shù)(此時(shí)的DIR只讀)普通旋轉(zhuǎn)編碼開(kāi)關(guān)的的波形。實(shí)際測(cè)試結(jié)果如下:與網(wǎng)上所介紹的有所不同，根據(jù)旋轉(zhuǎn)方向的不同，兩個(gè)波形有相位差（超前或滯后）同一時(shí)刻對(duì)應(yīng)的兩個(gè)波形的脈寬相同，不同的是占空比。農(nóng)331數(shù)方|可與編碼器信號(hào)的關(guān)柒有效邊沿相對(duì)信號(hào)的電邛THFP1 對(duì)應(yīng)TI2,TI2FP2 對(duì)旗TI1FP1 信號(hào)TI2FP2信號(hào)胡下降上升下降僅在 TM 計(jì)數(shù)高向下計(jì)數(shù)向上計(jì)數(shù)不計(jì)數(shù)不計(jì)數(shù)低向上計(jì)數(shù)向下計(jì)數(shù)不計(jì)數(shù)不計(jì)數(shù)僅在 TI2 計(jì)數(shù)高不計(jì)效不計(jì)數(shù)向上計(jì)數(shù)向下計(jì)數(shù)低不計(jì)數(shù)不計(jì)數(shù)向卜計(jì)數(shù)向上計(jì)數(shù)在 TI1 和 TI2 上計(jì)數(shù)鬲向下計(jì)數(shù)向上計(jì)數(shù)向上計(jì)數(shù)向下計(jì)數(shù)低向上計(jì)數(shù)向下計(jì)數(shù)向下計(jì)數(shù)向上計(jì)數(shù)實(shí)際操作中1TIM1-SMCR|=0X01順時(shí)針旋轉(zhuǎn)不穩(wěn)定有時(shí)+2逆時(shí)針?lè)€(wěn)定-22 TIM1-SMCR|=0X02順時(shí)針+1逆時(shí)針-1穩(wěn)定3 TIM1-SMCR|=0X03