Posted on June 25, 2007 at 13:38 Hello,
I'm using a STR750 microcontroler + an optical encoder whose resolution is 1024 ppr.
I'm trying to count 1024 pulses per rotation but I only get 2048 with TIM_Mode_Encoder1 or TIM_Mode_Encoder2 (ENC = 01 or 10) and 4096 pulses with TIM_Mode_Encoder3 (ENC = 11).
Is it possible to have 1024 pulses per revolution with my encoder ?
******************************************************************
// TIM0 Configuration
TIM_InitStructure.TIM_Mode = TIM_Mode_Encoder1;// resolution x1
//TIM_InitStructure.TIM_Mode = TIM_Mode_Encoder1; // resolution x4
TIM_InitStructure.TIM_Prescaler = 0x0;
TIM_InitStructure.TIM_ClockSource = TIM_ClockSource_Internal; // TIM_ClockSource = CK_TIM
TIM_InitStructure.TIM_Period = ENCODER_PPR - 1; // ENCODER_PPR = 1024
TIM_InitStructure.TIM_IC1Polarity = TIM_IC1Polarity_Rising;
TIM_InitStructure.TIM_IC2Polarity = TIM_IC2Polarity_Rising;
TIM_InitStructure.TIM_IC1Selection = TIM_IC1Selection_TI1; // A input
TIM_InitStructure.TIM_IC2Selection = TIM_IC2Selection_TI2; // B input
TIM_Init(TIM0, &TIM_InitStructure);
TIM_ClearFlag(ENCODER_TIMER, TIM_FLAG_IC1 + TIM_FLAG_OC1 + TIM_FLAG_Update + TIM_FLAG_IC2 + TIM_FLAG_OC2);
TIM_ITConfig(TIM0, TIM_IT_Update, ENABLE);
TIM_ResetCounter(TIM0);
*************************************************************
Thank you,
-Xavier
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Attachments : mode_codeur.JPG :
https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006HtR8&d=%2Fa%2F0X0000000aPz%2FqooZyPI1KOwpDRpfmUoLRq6k_czmOd83UzOb8PkuQNI&asPdf=false
