STM32F042 Encoder Problem

Posted on April 28, 2017 at 20:24

I'm using the stm32f042 nucleo board, Atollic truestudio and CubeMX launched from the Atollic GUI (eclipse) to develop code. I am trying to get the encoder interface on timer 3 to function as a step/dir counter. I have used CubeMX to select the encoder function on TIM3 which produces this initialization code - 

static void MX_TIM3_Init(void)

{

TIM_Encoder_InitTypeDef sConfig;

TIM_MasterConfigTypeDef sMasterConfig;

htim3.Instance = TIM3;

htim3.Init.Prescaler = 0;

htim3.Init.CounterMode = TIM_COUNTERMODE_UP;

htim3.Init.Period = 1800;

htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;

htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;

sConfig.EncoderMode = TIM_ENCODERMODE_TI1;

sConfig.IC1Polarity = TIM_ICPOLARITY_RISING;

sConfig.IC1Selection = TIM_ICSELECTION_DIRECTTI;

sConfig.IC1Prescaler = TIM_ICPSC_DIV1;

sConfig.IC1Filter = 0;

sConfig.IC2Polarity = TIM_ICPOLARITY_RISING;

sConfig.IC2Selection = TIM_ICSELECTION_DIRECTTI;

sConfig.IC2Prescaler = TIM_ICPSC_DIV1;

sConfig.IC2Filter = 0;

if (HAL_TIM_Encoder_Init(&htim3, &sConfig) != HAL_OK)

{

Error_Handler();

}

sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;

sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;

if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)

{

Error_Handler();

}

}

I have used the following start before the while loop in main - 

TIM3->CNT = 900;

HAL_TIM_Encoder_Start(&htim3,TIM_CHANNEL_ALL);

I've also tried TIM_CHANNEL_1 and 2

I set up a global variable 'counter' to monitor the value of the TIM3 cnt register.

 counter = TIM3->CNT; 

I cannot get the counter variable to move. It returns 900 no matter 

how I treat the PA6 and 7 lines. This problem is identical to the question 

https://community.st.com/0D50X00009XkexPSAR

 with the exception that this is the F042. There are no responses to the referenced question.

Any help here is greatly appreciated. 

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