problem with timers cascade

montagnanigiovanni · ‎2014-05-18

Posted on May 18, 2014 at 11:23

hello everybody, i've a problem with cascading 3 timers

i want to set TIM1 as a master, TIM2 as a slave (gated) and TIM3 as a slave of TIM1.

even if i use hal library i think the problem in my cade is simple!

i wrote this code, please help me :

/* TIM1 init function */

void MX_TIM1_Init(void)

{

TIM_ClockConfigTypeDef sClockSourceConfig;

TIM_OC_InitTypeDef sConfigOC;

TIM_BreakDeadTimeConfigTypeDef sBreakDeadTimeConfig;

TIM_MasterConfigTypeDef sMasterConfig;

htim1.Instance = TIM1;

htim1.Init.Prescaler = 0;

htim1.Init.CounterMode = TIM_COUNTERMODE_UP;

htim1.Init.Period = 100;

htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;

htim1.Init.RepetitionCounter = 0;

HAL_TIM_Base_Init(&htim1);

sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;

HAL_TIM_ConfigClockSource(&htim1, &sClockSourceConfig);

HAL_TIM_PWM_Init(&htim1);

sConfigOC.OCMode = TIM_OCMODE_PWM1;

sConfigOC.Pulse = 10;

sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;

sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;

sConfigOC.OCIdleState = TIM_OCIDLESTATE_RESET;

HAL_TIM_PWM_ConfigChannel(&htim1, &sConfigOC, TIM_CHANNEL_1);

sBreakDeadTimeConfig.LockLevel = TIM_LOCKLEVEL_OFF;

sBreakDeadTimeConfig.BreakState = TIM_BREAK_DISABLE;

sBreakDeadTimeConfig.BreakPolarity = TIM_BREAKPOLARITY_HIGH;

sBreakDeadTimeConfig.AutomaticOutput = TIM_AUTOMATICOUTPUT_DISABLE;

HAL_TIMEx_ConfigBreakDeadTime(&htim1, &sBreakDeadTimeConfig);

sMasterConfig.MasterOutputTrigger = TIM_TRGO_OC1REF;

sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_ENABLE;

HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig);

}

/* TIM2 init function */

void MX_TIM2_Init(void)

{

TIM_ClockConfigTypeDef sClockSourceConfig;

TIM_OC_InitTypeDef sConfigOC;

TIM_SlaveConfigTypeDef sSlaveConfig;

TIM_MasterConfigTypeDef sMasterConfig;

htim2.Instance = TIM2;

htim2.Init.Prescaler = 0;

htim2.Init.CounterMode = TIM_COUNTERMODE_UP;

htim2.Init.Period = 100;

htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;

HAL_TIM_Base_Init(&htim2);

sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;

HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig);

HAL_TIM_PWM_Init(&htim2);

sConfigOC.OCMode = TIM_OCMODE_PWM1;

sConfigOC.Pulse = 0;

sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;

sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;

HAL_TIM_PWM_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_1);

sSlaveConfig.SlaveMode = TIM_SLAVEMODE_GATED;

sSlaveConfig.InputTrigger = TIM_TS_ITR0;

HAL_TIM_SlaveConfigSynchronization(&htim2, &sSlaveConfig);

sMasterConfig.MasterOutputTrigger = TIM_TRGO_OC1REF;

sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_ENABLE;

HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig);

}

/* TIM4 init function */

void MX_TIM4_Init(void)

{

TIM_ClockConfigTypeDef sClockSourceConfig;

TIM_OC_InitTypeDef sConfigOC;

TIM_SlaveConfigTypeDef sSlaveConfig;

TIM_MasterConfigTypeDef sMasterConfig;

htim4.Instance = TIM4;

htim4.Init.Prescaler = 1;

htim4.Init.CounterMode = TIM_COUNTERMODE_UP;

htim4.Init.Period = 100;

htim4.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;

HAL_TIM_Base_Init(&htim4);

sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;

HAL_TIM_ConfigClockSource(&htim4, &sClockSourceConfig);

HAL_TIM_PWM_Init(&htim4);

HAL_TIM_OnePulse_Init(&htim4, TIM_OPMODE_SINGLE);

sConfigOC.OCMode = TIM_OCMODE_PWM1;

sConfigOC.Pulse = 50;

sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;

sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;

HAL_TIM_PWM_ConfigChannel(&htim4, &sConfigOC, TIM_CHANNEL_1);

sSlaveConfig.SlaveMode = TIM_SLAVEMODE_GATED;

sSlaveConfig.InputTrigger = TIM_TS_ITR1;

HAL_TIM_SlaveConfigSynchronization(&htim4, &sSlaveConfig);

sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;

sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;

HAL_TIMEx_MasterConfigSynchronization(&htim4, &sMasterConfig);

}

the problem is that i see tim4 ch1 working (led4 is on) even if i write

//HAL_TIM_PWM_Start(&htim1,TIM_CHANNEL_1); //HAL_TIM_PWM_Start(&htim2,TIM_CHANNEL_1);

HAL_TIM_PWM_Start(&htim4,TIM_CHANNEL_1);

so the first two pwm are not working, why i see an output?

thank you so much for your time

Gio

#discovery #stm32f4 #pwm #output

montagnanigiovanni · ‎2014-05-18

Posted on May 18, 2014 at 21:00

hello, i recognize my that question is badly written. my question is: why i see pwm of tim4 working even if i put tim4 as a slave and i'm not enabling tim2 that is his master?

thank you for your help