Posted on June 07, 2017 at 12:59
Hi,
Variable PWM is not working. So i looked at theexample code provided in 'STM32Cube_FW_F4_V1.0\Projects\STM324x9I_EVAL\Examples\TIM\TIM_DMA'
Based on example, modified code generated using cubeMx.
Please can anyone tell me the
1) What is Repetition counter(
htim8.Init.RepetitionCounter) ? how it effects timer and PWM?
2) Where is the mistake in below code?
In main.c
int main(void)
{
HAL_Init();
SystemClock_Config();
lowPass();
MX_GPIO_Init();
MX_DMA_Init();
MX_TIM8_Init();
while(1){
if(htim8.State==HAL_TIM_STATE_READY){
HAL_TIM_PWM_Start_DMA(&htim8,TIM_CHANNEL_3,(uint32_t *)&SineLookupTable[0],PWM_SZ);
}
}
}
void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* htim_base){
__HAL_RCC_TIM8_CLK_ENABLE();
hdma_tim8_ch3.Instance = DMA2_Stream4;
hdma_tim8_ch3.Init.Channel = DMA_CHANNEL_7;
hdma_tim8_ch3.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_tim8_ch3.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_tim8_ch3.Init.MemInc = DMA_MINC_ENABLE;
hdma_tim8_ch3.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
hdma_tim8_ch3.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
hdma_tim8_ch3.Init.Mode = DMA_CIRCULAR;
hdma_tim8_ch3.Init.Priority = DMA_PRIORITY_LOW;
hdma_tim8_ch3.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
if (HAL_DMA_Init(&hdma_tim8_ch3) != HAL_OK) {
_Error_Handler(__FILE__, __LINE__);
}
__HAL_LINKDMA(htim_base,hdma[TIM_DMA_ID_CC3],hdma_tim8_ch3);
/* TIM8 interrupt Init */
HAL_NVIC_SetPriority(TIM8_BRK_TIM12_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(TIM8_BRK_TIM12_IRQn);
HAL_NVIC_SetPriority(TIM8_UP_TIM13_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(TIM8_UP_TIM13_IRQn);
HAL_NVIC_SetPriority(TIM8_TRG_COM_TIM14_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(TIM8_TRG_COM_TIM14_IRQn);
HAL_NVIC_SetPriority(TIM8_CC_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(TIM8_CC_IRQn);
}
static void MX_TIM8_Init(void){
TIM_ClockConfigTypeDef sClockSourceConfig;
TIM_MasterConfigTypeDef sMasterConfig;
TIM_OC_InitTypeDef sConfigOC;
TIM_BreakDeadTimeConfigTypeDef sBreakDeadTimeConfig;
htim8.Instance = TIM8;
htim8.Init.Prescaler = 100;
htim8.Init.CounterMode = TIM_COUNTERMODE_UP;
htim8.Init.Period = TIM8_IR_CNT_VAL;
htim8.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim8.Init.RepetitionCounter = PWM_SZ;
if (HAL_TIM_Base_Init(&htim8) != HAL_OK) {
_Error_Handler(__FILE__, __LINE__);
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim8, &sClockSourceConfig) != HAL_OK){
_Error_Handler(__FILE__, __LINE__);
}
if (HAL_TIM_PWM_Init(&htim8) != HAL_OK){
_Error_Handler(__FILE__, __LINE__);
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim8, &sMasterConfig) != HAL_OK){
_Error_Handler(__FILE__, __LINE__);
}
sConfigOC.OCMode = TIM_OCMODE_PWM1;
sConfigOC.Pulse = TIM8_IR_DUTY_VAL;
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_PWM_ConfigChannel(&htim8, &sConfigOC, TIM_CHANNEL_3) != 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.AutomaticOutput = TIM_AUTOMATICOUTPUT_DISABLE;
if (HAL_TIMEx_ConfigBreakDeadTime(&htim8, &sBreakDeadTimeConfig) != HAL_OK){
_Error_Handler(__FILE__, __LINE__);
}
HAL_TIM_MspPostInit(&htim8);
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Instm32f4xx_it.c
#define PWM_SZ 100
uint32_t SineLookupTable[PWM_SZ];
const float Angle_Step_Rate=1.8;
void waveform(void){
uint8_t tmp;
for(tmp=0;tmp<PWM_SZ;tmp++){
SineLookupTable[tmp] = (TIM8_IR_CNT_VAL*(tmp+1))/PWM_SZ;
}
}
void DMA2_Stream4_IRQHandler(void){
HAL_DMA_IRQHandler(&hdma_tim8_ch3);
}�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?
#timer #stm32f4 #pwm #dma #stm32f4-discovery #stm32f4-disco #stm32f4-pwm #stm32f4discovery-stm32f4 #timer-pwm
