Question
PWM WÄ°TH DMA
Posted on October 20, 2016 at 07:50
Hi guys.I want to try pwm with dma.(by using burst)I tried to send data to timx_arr(period) that necessary for pwm. Still, ı observed from logic analyzer. But it has not signal without writing ''tim_timebaseinitstructure.tim_period''.what do you think about that problem? Actually, ı send from buffer to memory0base.However,Will data that start in memory0base address cross to address of timx_arr in peripheral?
#include ''stm32f4xx.h'' // Device header
//DEFINITIONS
#define TIM1_DMAR_ADDRESS ((uint16_t)0x4001004C) //TIMER DMA REGISTER ADDRESS
#define BUFFER_SIZE 3 // DATA WIDTH
//ARRAYS & VARIABLES
const uint16_t DATA_BUFFER[3]={0xFFFF,0,0x000F}; //ARR,RCR,CCR1
//PROTOTYPES
void DMA_CONFIGURATIONS(void);
void GPIO_CONFIGURATIONS(void);
void RCC_CONFIGURATIONS(void);
void TIMER_CONFIGURATIONS(void);
void PWM_CONFIGURATIONS(void);
void PERIPHERALS_ENABLE(void);
void NVIC_CONFIGURATIONS(void);
void LED_INIT(void);
//DEFINE STRUCTURE
DMA_InitTypeDef DMA_InitStructure; //DIRECT MEMORY ACCESS(DMA) INITLIZATION VARIABLE
GPIO_InitTypeDef GPIO_InitStructure; //GENERAL PURPOSE INPUT/OUTPUT INITALIZATION VARIABLE
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure; //TIMER INITALIZATION VARIABLE
TIM_OCInitTypeDef TIM_OCInitStructure; //TIMER OUTPUT COMPARE INITALIZATION VARIABLE
NVIC_InitTypeDef NVIC_InitStructure; //INTERRUPTS INITALIZATION
//INTERRUPTS
void DMA2_Stream5_IRQHandler()
{
if(DMA_GetITStatus(DMA2_Stream5,DMA_IT_TCIF5)!=RESET)
{
DMA_ClearITPendingBit(DMA2_Stream5,DMA_IT_TCIF5); //CLEAR TCIF5 FLAG (TRANSFER COMPLETE INTERRUPT FLAG)
LED_INIT(); //LED INITALIZATION
}
}
int main()
{
// DEFAULT SYSTEM SETTINGS
RCC_CONFIGURATIONS();
GPIO_CONFIGURATIONS();
NVIC_CONFIGURATIONS();
TIMER_CONFIGURATIONS();
DMA_CONFIGURATIONS();
PWM_CONFIGURATIONS();
PERIPHERALS_ENABLE();
while (!DMA_GetFlagStatus(DMA2_Stream5, DMA_FLAG_TCIF5));
while(1);
}
/**
@brief : DMA-2 CONFIGURATIONS
@para : NONE
@retval : NONE
*/
void DMA_CONFIGURATIONS()
{
DMA_DeInit(DMA2_Stream5); //DEFAULT DMA SETTINGS
DMA_InitStructure.DMA_Channel = DMA_Channel_6; // DEFINE DMA CHANNEL
DMA_InitStructure.DMA_Memory0BaseAddr = (uint16_t)DATA_BUFFER ; // SHOW FIRST ADDRESS OF MEMORY BASE
DMA_InitStructure.DMA_BufferSize = BUFFER_SIZE ; // DATA THAT COME FROM PERIPHERAL(PWM) IS HALFWORD(16-BIT)
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral; // SHOW THAT GO FROM MEMORY TO PERIPHERAL
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Enable; // ENABLE FIRST-IN FIRST-OUT
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full; // THRESHOLD FULL OF DATA
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; // (MEMORY BURST) SINGLE
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; // DATA TYPE HALFWORD
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; // AUTOMATICALLY INCREMENTING MEMORY ADDRESS
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; // DON'T RELOAD AUTOMATICALLY WITH PREVIOUSLY PROGRAMMING VALUE
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint16_t)TIM1_DMAR_ADDRESS; // DEFINE PERIPHERAL ADDRESS
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; // PERIPHERAL SINGLE
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;// DATA TYPE HALFWORD
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Enable; // AUTOMATICALLY INCREMENTING PERIPHERAL ADDRESS
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh; // PRIORITY VERYHIGH
DMA_Init(DMA2_Stream5,&DMA_InitStructure); // DMA INITIZALITION
DMA_ITConfig(DMA2_Stream5,DMA_IT_TC,ENABLE); //TRANSFER COMPLETE INTERRUPT FLAG IS ENABLED
DMA_PeriphIncOffsetSizeConfig(DMA2_Stream5,DMA_PINCOS_Psize);
}
/**
*@brief : GENERAL PURPOSE INPUT OUTPUT CONFIGURATIONS
*@para : NONE
*@retval: NONE
*/
void GPIO_CONFIGURATIONS()
{
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; // ALTERNATIVE FUNCTION
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; // PULL-UP PULL-DOWN
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; // CHOOSE PIN 8
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; // NOPULL
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; // SPEED 100MHz
GPIO_Init(GPIOA,&GPIO_InitStructure); // GPIOA INITALIZATION
GPIO_PinAFConfig(GPIOA,GPIO_PinSource8,GPIO_AF_TIM1); //ALTERNATIVE FUNCTION TIMER
}
/**
*@brief : CONFIGURE PERIPHERAL CLOCKS
*@para : NONE
*@retval : NONE
*/
void RCC_CONFIGURATIONS()
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE); //TIM1 CLOCK ENABLE
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOD,ENABLE); //GPIOA|D CLOCK ENABLE
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2,ENABLE); //DMA2 CLOCK ENABLE
}
/**
*@brief : CONFIGURE TIMER
*@para : NONE
*@retval : NONE
*/
void TIMER_CONFIGURATIONS()
{
TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInitStructure.TIM_Prescaler = 0;
TIM_TimeBaseInitStructure.TIM_RepetitionCounter= 0;
TIM_TimeBaseInit(TIM1,&TIM_TimeBaseInitStructure);
}
/**
*@brief : CONFIGURE PWM
*@para : NONE
*@retval : NONE
*/
void PWM_CONFIGURATIONS()
{
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; // PWM OUTPUT
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; // STARTING WAVE IS LOW
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0xFFF;
TIM_OC1Init(TIM1,&TIM_OCInitStructure);
}
/**
*@brief : ENABLE PERIPHERALS (DMA,TIM,PWM)
*@para : NONE
*@retval : NONE
*/
void PERIPHERALS_ENABLE()
{
TIM_DMAConfig(TIM1,TIM_DMABase_PSC,TIM_DMABurstLength_3Transfers);
TIM_DMACmd(TIM1,TIM_DMA_Update,ENABLE);
TIM_Cmd(TIM1,ENABLE);
TIM_CtrlPWMOutputs(TIM1,ENABLE);
DMA_Cmd(DMA2_Stream5,ENABLE);
}
/**
*@brief : CONFIGURE NVIC
*@para : NONE
*@retval : NONE
*/
void NVIC_CONFIGURATIONS()
{
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
/**
*@brief : LED INITILIZATIONS
*@para : NONE
*@retval : NONE
*/
void LED_INIT()
{
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_Init(GPIOD,&GPIO_InitStructure);
GPIO_ToggleBits(GPIOD, GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15);
}