Posted on April 28, 2018 at 01:37 
Hey everyone,
I can not seem to get this right and any help would really be appreciated!
I'm using a stm32f722ze
I have a counter that toggles it's output on every 10th rising clock edge of an external clock that fed into its ETR pin. It also has a slave mode set as rising.
Here's the code for the timer:
static void MX_TIM8_Init(void)
{TIM_ClockConfigTypeDef sClockSourceConfig;
TIM_SlaveConfigTypeDef sSlaveConfig; TIM_MasterConfigTypeDef sMasterConfig; TIM_OC_InitTypeDef sConfigOC; TIM_BreakDeadTimeConfigTypeDef sBreakDeadTimeConfig;htim8.Instance = TIM8;
htim8.Init.Prescaler = 0; htim8.Init.CounterMode = TIM_COUNTERMODE_UP; htim8.Init.Period = 9; htim8.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1; htim8.Init.RepetitionCounter = 0; htim8.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE; if (HAL_TIM_Base_Init(&htim8) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); }sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_ETRMODE2;
sClockSourceConfig.ClockPolarity = TIM_CLOCKPOLARITY_NONINVERTED; sClockSourceConfig.ClockPrescaler = TIM_CLOCKPRESCALER_DIV1; sClockSourceConfig.ClockFilter = 0; if (HAL_TIM_ConfigClockSource(&htim8, &sClockSourceConfig) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); }if (HAL_TIM_OC_Init(&htim8) != HAL_OK)
{ _Error_Handler(__FILE__, __LINE__); }sSlaveConfig.SlaveMode = TIM_SLAVEMODE_RESET;
sSlaveConfig.InputTrigger = TIM_TS_TI1FP1;sSlaveConfig.TriggerPolarity = TIM_TRIGGERPOLARITY_FALLING;
sSlaveConfig.TriggerFilter = 0; if (HAL_TIM_SlaveConfigSynchronization(&htim8, &sSlaveConfig) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); }sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterOutputTrigger2 = TIM_TRGO2_RESET; sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE; if (HAL_TIMEx_MasterConfigSynchronization(&htim8, &sMasterConfig) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); }sConfigOC.OCMode = TIM_OCMODE_TOGGLE;
sConfigOC.Pulse = 9; sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH; sConfigOC.OCNPolarity = TIM_OCNPOLARITY_HIGH; sConfigOC.OCFastMode = TIM_OCFAST_DISABLE; sConfigOC.OCIdleState = TIM_OCIDLESTATE_RESET; sConfigOC.OCNIdleState = TIM_OCNIDLESTATE_RESET; if (HAL_TIM_OC_ConfigChannel(&htim8, &sConfigOC, TIM_CHANNEL_2) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); }sBreakDeadTimeConfig.OffStateRunMode = TIM_OSSR_DISABLE;
sBreakDeadTimeConfig.OffStateIDLEMode = TIM_OSSI_DISABLE; sBreakDeadTimeConfig.LockLevel = TIM_LOCKLEVEL_OFF; sBreakDeadTimeConfig.DeadTime = 0; sBreakDeadTimeConfig.BreakState = TIM_BREAK_DISABLE; sBreakDeadTimeConfig.BreakPolarity = TIM_BREAKPOLARITY_HIGH; sBreakDeadTimeConfig.BreakFilter = 0; sBreakDeadTimeConfig.Break2State = TIM_BREAK2_DISABLE; sBreakDeadTimeConfig.Break2Polarity = TIM_BREAK2POLARITY_HIGH; sBreakDeadTimeConfig.Break2Filter = 0; sBreakDeadTimeConfig.AutomaticOutput = TIM_AUTOMATICOUTPUT_DISABLE; if (HAL_TIMEx_ConfigBreakDeadTime(&htim8, &sBreakDeadTimeConfig) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); }HAL_TIM_MspPostInit(&htim8);
}
I want the falling edge of a reset signal to reset the counter, but it doesn't seem to happen.
This is what's currently happening, no matter what I do to sSlaveConfig.TriggerPolarity.( I can also see the values changing in the register)
So these are the signals in the image:
purple = clock
Yellow = reset
blue = output of timer
when the reset signal goes high, it seems to count the clock edge that goes high with it, then the following 9 rising edges after which it toggles the output.
Here's one that occurs after the reset;
Here it toggles after 10 rising edges .
Here's another one:
How can I get the falling edge of the reset to trigger the reset, because I don't want the edge that rises with the reset signal to be counter?
Thanks in advance for any help
stm32f7
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