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Microsecond timer using Tim3

Question asked by Matthieu Tanguay on Jun 24, 2017
Latest reply on Jun 26, 2017 by Clive One

Hello,
I think variation of this question has been asked a couple of time, but i'm trying to understand why what I am writing is not working. 

Because I want to get some experience with the HAL librairies I got myself a NucleoF446RE and an accessory shield with a P9813 LED Driver.

 

I also found this code that I am modifying to use HAL : https://codebender.cc/library/ChainableLED#ChainableLED.cpp.

 

I think my problems come from my micro seconds delay function. I used the Cube to generate the base code but here is what pertain to Timer3 : 

 

 

MX_TIM3_Init();
HAL_TIM_Base_Start(&htim3);

static void MX_TIM3_Init(void)
{
TIM_ClockConfigTypeDef sClockSourceConfig;
TIM_MasterConfigTypeDef sMasterConfig;
htim3.Instance = TIM3;
htim3.Init.Prescaler = 84;
htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
htim3.Init.Period = 0xffff;//Full 16bit
htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
if (HAL_TIM_Base_Init(&htim3) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
}

//Function for micro seconds Delay
void microseconds_Delay(int Delay){
uint32_t initTime = __HAL_TIM_GET_COUNTER(&htim3);
while((__HAL_TIM_GET_COUNTER(&htim3)-initTime) < Delay){
}
}

 

Thank you in advance.

 

MT

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