Posted on May 06, 2016 at 13:35@clive: here my idea:
1.) i set up the timer @ 800khz, pulse 0 /* TIM3 init function */
void MX_TIM3_Init(void)
{
TIM_MasterConfigTypeDef sMasterConfig;
TIM_OC_InitTypeDef sConfigOC;
htim3.Instance = TIM3;
htim3.Init.Prescaler = 0;
htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
htim3.Init.Period = 89;
htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
HAL_TIM_PWM_Init(&htim3);
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig);
sConfigOC.OCMode = TIM_OCMODE_PWM1;
sConfigOC.Pulse = 0;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_ENABLE;
HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_1);
HAL_TIM_MspPostInit(&htim3);
}
2.) cubeMX implements the DMA end of transfer callback routine /**
* Enable DMA controller clock
*/
void MX_DMA_Init(void)
{
/* DMA controller clock enable */
__HAL_RCC_DMA1_CLK_ENABLE();
/* DMA interrupt init */
/* DMA1_Channel3_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA1_Channel3_IRQn, 2, 0);
HAL_NVIC_EnableIRQ(DMA1_Channel3_IRQn);
}
3.) initialization /* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_RTC_Init();
MX_TIM3_Init();
4.) start the services as follows: HAL_TIM_Base_Start
HAL_TIM_PWM_Start
HAL_TIM_PWM_Start_IT
HAL_DMA_Start
HAL_DMA_Start_IT
5.) application im now able to start the first DMA transfer with the function:
HAL_TIM_DMABurst_WriteStart??
then, im going to ignore the DMA end of transfer callback:
DMA1_Channel3_IRQHandler
and with the Timer callback:
TIM3_IRQHandler
im going to start the DMA transfer all over again with the next pulse with??
HAL_TIM_DMABurst_WriteStart??
is this what i need to do?
