2015-11-26 08:38 AM
I have STM32F103 working on 8MHz.
If I InitPWM on Ch1 Tim3void MX_TIM3_Init(void)
{
TIM_ClockConfigTypeDef sClockSourceConfig;
TIM_MasterConfigTypeDef sMasterConfig;
TIM_OC_InitTypeDef sConfigOC;
htim3.Instance = TIM3;
htim3.Init.Prescaler = 0;
htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
htim3.Init.Period = 9;
htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
HAL_TIM_Base_Init(&htim3);
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig);
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 = 1;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_1);
}
and star ti with
HAL_TIM_PWM_Start_IT(&htim3, TIM_CHANNEL_1);
all working OK and output generate 125ns pulse on 800kHz (1.25us)
If replace Start_IT with DMA version
uint32_t pData[1]={6};
HAL_TIM_PWM_Start_DMA(&htim3, TIM_CHANNEL_1,pData,1);
all working OK and output generate 70ns pulse on 800kHz (1.25us),but if use
uint32_t pData[16]={3,3,3,3,3,3,3,3,0,0,0,0,0,0,0,0};
HAL_TIM_PWM_Start_DMA(&htim3, TIM_CHANNEL_1,pData,16);
this genreate 375ns its OK but frequency is 400kHz(2,5us)
If I trace and look on reg CCR1 I see
3,0,3,0,3,0,3,0,3,0,3,0,3,0,3,0
What's
wrong
,
what's the problem
?
#he-chose-poorly2015-11-27 03:03 AM
void MX_TIM3_Init(void)
{
TIM_ClockConfigTypeDef sClockSourceConfig;
TIM_MasterConfigTypeDef sMasterConfig;
TIM_OC_InitTypeDef sConfigOC;
htim3.Instance = TIM3;
htim3.Init.Prescaler = 0;
htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
htim3.Init.Period = (72 / 8) - 1;
htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
HAL_TIM_Base_Init(&htim3);
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig);
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 = 1;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_1);
}
uint16_t pData[16]={3,3,3,3,3,3,3,3,0,0,0,0,0,0,0,0}; // Half-Words
HAL_TIM_PWM_Start_DMA(&htim3, TIM_CHANNEL_1,pData,16);
2015-11-27 03:13 AM
Perhaps related?
[DEAD LINK /public/STe2ecommunities/mcu/Lists/STM32Java/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/STM32Java/STM32F1%20PWM%20wit%20DMA&FolderCTID=0x01200200770978C69A1141439FE559EB459D758000F9A0E3A95BA69146A17C2E80209ADC21&TopicsView=https://my.st.com/public/STe2ecommunities/mcu/Lists/STM32Java/AllItems.aspx¤tviews=19]https://my.st.com/public/STe2ecommunities/mcu/Lists/STM32Java/Flat.aspx?RootFolder=%2fpublic%2fSTe2ecommunities%2fmcu%2fLists%2fSTM32Java%2fSTM32F1%20PWM%20wit%20DMA&FolderCTID=0x01200200770978C69A1141439FE559EB459D758000F9A0E3A95BA69146A17C2E80209ADC21&TopicsView=https%3A%2F%2Fmy.st.com%2Fpublic%2FSTe2ecommunities%2Fmcu%2FLists%2FSTM32Java%2FAllItems.aspx¤tviews=19 The joys of using HAL I guess2015-11-28 07:47 AM
Thanks you . With half word you have tue,
According to my
htim3.Init.Period = (clock of timer / output frequency)-1
htim3.Init.Period = ( 8MHz/ 800kHz)-1 htim3.Init.Period = 9 is correctly. However, I foundanother problém. /* TIM3 init function */
void MX_TIM3_Init(void) { TIM_ClockConfigTypeDef sClockSourceConfig; TIM_MasterConfigTypeDef sMasterConfig; TIM_OC_InitTypeDef sConfigOC; htim3.Instance = TIM3; htim3.Init.Prescaler = 0; htim3.Init.CounterMode = TIM_COUNTERMODE_UP; htim3.Init.Period = 9; htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1; HAL_TIM_Base_Init(&htim3); sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL; HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig); 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_DISABLE; HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_1); } uint16_t pData[25]={3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,6,6,6,6,6,6,6,6,0}; HAL_TIM_PWM_Start_DMA(&htim3, TIM_CHANNEL_1,(uint32_t*)pData,25); I thing, this send 16x Log1 375ns /Log0 875ns + 8x Log1 750ns / Log0 500ns but hw logic analyser show thisTiming
is OK, but problem is in
the number of pulses
instead of 16 short have 19 short pulses and
instead of8long have 9 long pulses
Which
could be the
problem?
2015-11-28 09:24 AM
Try running the buses/CPU faster, and ensure the pattern buffer is in RAM