智能车制作

标题: FTM正交解码一个方向却时正时负 [打印本页]

作者: 盛夏的果实 时间: 2015-3-23 17:30
标题: FTM正交解码一个方向却时正时负
方向不变，但是采集的只却时正时负，怎么回事？

oid Pulse_Counter_Init(void)
{

   SIM_SCGC3 |= SIM_SCGC3_FTM2_MASK;
FTM_MODE_REG(PULSE_COUNTER2_PTR) = 0|FTM_MODE_WPDIS_MASK|FTM_MODE_FTMEN_MASK; // Write protection is disabled, FTM enabale
FTM_CNTIN_REG(PULSE_COUNTER2_PTR) = 0UL; // counter initialization value is 0
FTM_CNT_REG(PULSE_COUNTER2_PTR) = 0UL;  //clear counter
FTM_MOD_REG(PULSE_COUNTER2_PTR) = FTM_MOD_MOD(0xffff);  //Maxvalue 65535
FTM_SC_REG(PULSE_COUNTER2_PTR) = 0|FTM_SC_CLKS(3)|FTM_SC_PS(1); //external clock,divide by 2
FTM_QDCTRL_REG(PULSE_COUNTER2_PTR) = 0|FTM_QDCTRL_QUADEN_MASK|FTM_QDCTRL_PHAFLTREN_MASK|FTM_QDCTRL_PHBFLTREN_MASK;

FTM_FILTER_REG(PULSE_COUNTER2_PTR) = 0|FTM_FILTER_CH0FVAL(15)|FTM_FILTER_CH1FVAL(15);

PULSE_COUNTER2A_PCR = 0 | PORT_PCR_MUX(PULSE_COUNTER2A_ALTn);
PULSE_COUNTER2B_PCR = 0 | PORT_PCR_MUX(PULSE_COUNTER2B_ALTn);

}

采集

countervalue = (int16)FTM_CNT_REG(PULSE_COUNTER2_PTR);  //Read counter value
FTM_CNT_REG(PULSE_COUNTER2_PTR) = 0UL;

作者: 徐鹏 时间: 2015-3-25 21:22
编码器接上啦电阻没啊

作者: 盛夏的果实 时间: 2015-3-27 11:21
接了

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