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I Need Some Help To Understanding Timer Trigger....

hukhongcongtu26111993
Associate II

‎2016-05-10 02:41 AM

Posted on May 10, 2016 at 11:41

Hi!

I want to use DAC generating Sine wave. But I don't understand why I need '' static'' key in the function

static void

TIM6_Config(

void

);

static

void

DAC1_Config(

void

);If I delete static, Sine wave do not creat. :( I need some explanation about static function and Timer trigger in STM32. this is my full code:

&sharpinclude <stm32f4xx.h>

&sharpdefine

OUT_FREQ 5000

//

Output waveform frequency

&sharpdefine

SINE_RES 128

//

Waveform resolution

&sharpdefine

DAC_DHR12R1_ADDR 0x40007408

//

DMA writes into this reg on every request

&sharpdefine

CNT_FREQ 42000000

//

TIM6 counter clock (prescaled APB1)

&sharpdefine

TIM_PERIOD ((CNT_FREQ)/((SINE_RES)*(OUT_FREQ)))

//

Autoreload reg value

const

uint16_t function[SINE_RES] = {

2048

,

2145

,

2242

,

2339

,

2435

,

2530

,

2624

,

2717

,

2808

,

2897

,

2984

,

3069

,

3151

,

3230

,

3307

,

3381

,

3451

,

3518

,

3581

,

3640

,

3696

,

3748

,

3795

,

3838

,

3877

,

3911

,

3941

,

3966

,

3986

,

4002

,

4013

,

4019

,

4020

,

4016

,

4008

,

3995

,

3977

,

3954

,

3926

,

3894

,

3858

,

3817

,

3772

,

3722

,

3669

,

3611

,

3550

,

3485

,

3416

,

3344

,

3269

,

3191

,

3110

,

3027

,

2941

,

2853

,

2763

,

2671

,

2578

,

2483

,

2387

,

2291

,

2194

,

2096

,

1999

,

1901

,

1804

,

1708

,

1612

,

1517

,

1424

,

1332

,

1242

,

1154

,

1068

,

985

,

904

,

826

,

751

,

679

,

610

,

545

,

484

,

426

,

373

,

323

,

278

,

237

,

201

,

169

,

141

,

118

,

100

,

87

,

79

,

75

,

76

,

82

,

93

,

109

,

129

,

154

,

184

,

218

,

257

,

300

,

347

,

399

,

455

,

514

,

577

,

644

,

714

,

788

,

865

,

944

,

1026

,

1111

,

1198

,

1287

,

1378

,

1471

,

1565

,

1660

,

1756

,

1853

,

1950

,

2047

};

static

void

TIM6_Config(

void

);

static

void

DAC1_Config(

void

);

int

main(){ GPIO_InitTypeDef gpio_A; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE); RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE); gpio_A.GPIO_Pin

=

GPIO_Pin_4; gpio_A.GPIO_Mode

=

GPIO_Mode_AN; gpio_A.GPIO_PuPd

=

GPIO_PuPd_NOPULL; GPIO_Init(GPIOA,

&

gpio_A); TIM6_Config(); DAC1_Config();

while

(

1

) { } }

static

void

TIM6_Config(

void

){ TIM_TimeBaseInitTypeDef TIM6_TimeBase; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6, ENABLE); TIM_TimeBaseStructInit(

&

TIM6_TimeBase); TIM6_TimeBase.TIM_Period

=

(uint16_t)TIM_PERIOD; TIM6_TimeBase.TIM_Prescaler

=

0

; TIM6_TimeBase.TIM_ClockDivision

=

0

; TIM6_TimeBase.TIM_CounterMode

=

TIM_CounterMode_Up; TIM_TimeBaseInit(TIM6,

&

TIM6_TimeBase); TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update); TIM_Cmd(TIM6, ENABLE);}

static

void

DAC1_Config(

void

){ DAC_InitTypeDef DAC_INIT; DMA_InitTypeDef DMA_INIT; DAC_INIT.DAC_Trigger

=

DAC_Trigger_T6_TRGO; DAC_INIT.DAC_WaveGeneration

=

DAC_WaveGeneration_None; DAC_INIT.DAC_OutputBuffer

=

DAC_OutputBuffer_Enable; DAC_Init(DAC_Channel_1,

&

DAC_INIT); DMA_DeInit(DMA1_Stream5); DMA_INIT.DMA_Channel

=

DMA_Channel_7; DMA_INIT.DMA_PeripheralBaseAddr

=

(uint32_t)DAC_DHR12R1_ADDR; DMA_INIT.DMA_Memory0BaseAddr

= (uint32_t)&

function; DMA_INIT.DMA_DIR

=

DMA_DIR_MemoryToPeripheral; DMA_INIT.DMA_BufferSize

=

SINE_RES; DMA_INIT.DMA_PeripheralInc

=

DMA_PeripheralInc_Disable; DMA_INIT.DMA_MemoryInc

=

DMA_MemoryInc_Enable; DMA_INIT.DMA_PeripheralDataSize

=

DMA_PeripheralDataSize_HalfWord; DMA_INIT.DMA_MemoryDataSize

=

DMA_MemoryDataSize_HalfWord; DMA_INIT.DMA_Mode

=

DMA_Mode_Circular; DMA_INIT.DMA_Priority

=

DMA_Priority_High; DMA_INIT.DMA_FIFOMode

=

DMA_FIFOMode_Disable; DMA_INIT.DMA_FIFOThreshold

=

DMA_FIFOThreshold_HalfFull; DMA_INIT.DMA_MemoryBurst

=

DMA_MemoryBurst_Single; DMA_INIT.DMA_PeripheralBurst

=

DMA_PeripheralBurst_Single; DMA_Init(DMA1_Stream5,

&

DMA_INIT); DMA_Cmd(DMA1_Stream5, ENABLE); DAC_Cmd(DAC_Channel_1, ENABLE); DAC_DMACmd(DAC_Channel_1, ENABLE);}

#timer-trigger #static
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7 REPLIES 7
Tesla DeLorean
Guru

‎2016-05-10 03:55 AM

Posted on May 10, 2016 at 12:55

The code as presented is nearly unreadable, please use the Format Code Block option. The Paintbrush [{}] icon.

The static directive shouldn't make.a difference to the functions in this context. What compiler are you using? Have you single stepped the code in a debugger to better understand what is going on.

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hukhongcongtu26111993
Associate II

‎2016-05-10 05:03 AM

Posted on May 10, 2016 at 14:03 

#include <
stm32f4xx.h
>

#define OUT_FREQ 5000 // Output waveform frequency
#define SINE_RES 128 // Waveform resolution
#define DAC_DHR12R1_ADDR 0x40007408 // DMA writes into this reg on every request
#define CNT_FREQ 42000000 // TIM6 counter clock (prescaled APB1)
#define TIM_PERIOD ((CNT_FREQ)/((SINE_RES)*(OUT_FREQ))) // Autoreload reg value
const uint16_t function[SINE_RES] = { 2048, 2145, 2242, 2339, 2435, 2530, 2624, 2717, 2808, 2897, 
2984, 3069, 3151, 3230, 3307, 3381, 3451, 3518, 3581, 3640, 
3696, 3748, 3795, 3838, 3877, 3911, 3941, 3966, 3986, 4002, 
4013, 4019, 4020, 4016, 4008, 3995, 3977, 3954, 3926, 3894, 
3858, 3817, 3772, 3722, 3669, 3611, 3550, 3485, 3416, 3344, 
3269, 3191, 3110, 3027, 2941, 2853, 2763, 2671, 2578, 2483, 
2387, 2291, 2194, 2096, 1999, 1901, 1804, 1708, 1612, 1517, 
1424, 1332, 1242, 1154, 1068, 985, 904, 826, 751, 679, 
610, 545, 484, 426, 373, 323, 278, 237, 201, 169, 
141, 118, 100, 87, 79, 75, 76, 82, 93, 109, 
129, 154, 184, 218, 257, 300, 347, 399, 455, 514, 
577, 644, 714, 788, 865, 944, 1026, 1111, 1198, 1287, 
1378, 1471, 1565, 1660, 1756, 1853, 1950, 2047 }; 
static void TIM6_Config(void);
static void DAC1_Config(void); 
int main()
{
GPIO_InitTypeDef gpio_A;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); 
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
gpio_A.GPIO_Pin = GPIO_Pin_4;
gpio_A.GPIO_Mode = GPIO_Mode_AN;
gpio_A.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &gpio_A);
TIM6_Config(); 
DAC1_Config();
while (1)
{
}
}
static void TIM6_Config(void)
{
TIM_TimeBaseInitTypeDef TIM6_TimeBase;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6, ENABLE);
TIM_TimeBaseStructInit(&TIM6_TimeBase); 
TIM6_TimeBase.TIM_Period = (uint16_t)TIM_PERIOD; 
TIM6_TimeBase.TIM_Prescaler = 0; 
TIM6_TimeBase.TIM_ClockDivision = 0; 
TIM6_TimeBase.TIM_CounterMode = TIM_CounterMode_Up; 
TIM_TimeBaseInit(TIM6, &TIM6_TimeBase);
TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update);
TIM_Cmd(TIM6, ENABLE);
}
static void DAC1_Config(void)
{
DAC_InitTypeDef DAC_INIT;
DMA_InitTypeDef DMA_INIT;
DAC_INIT.DAC_Trigger = DAC_Trigger_T6_TRGO;
DAC_INIT.DAC_WaveGeneration = DAC_WaveGeneration_None;
DAC_INIT.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
DAC_Init(DAC_Channel_1, &DAC_INIT);
DMA_DeInit(DMA1_Stream5);
DMA_INIT.DMA_Channel = DMA_Channel_7; 
DMA_INIT.DMA_PeripheralBaseAddr = (uint32_t)DAC_DHR12R1_ADDR;
DMA_INIT.DMA_Memory0BaseAddr = (uint32_t)&function;
DMA_INIT.DMA_DIR = DMA_DIR_MemoryToPeripheral;
DMA_INIT.DMA_BufferSize = SINE_RES;
DMA_INIT.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_INIT.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_INIT.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_INIT.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_INIT.DMA_Mode = DMA_Mode_Circular;
DMA_INIT.DMA_Priority = DMA_Priority_High;
DMA_INIT.DMA_FIFOMode = DMA_FIFOMode_Disable; 
DMA_INIT.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
DMA_INIT.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_INIT.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA1_Stream5, &DMA_INIT);
DMA_Cmd(DMA1_Stream5, ENABLE);
DAC_Cmd(DAC_Channel_1, ENABLE);
DAC_DMACmd(DAC_Channel_1, ENABLE);
}
Sorry for my deficiency !!!

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hukhongcongtu26111993
Associate II

‎2016-05-10 05:07 AM

Posted on May 10, 2016 at 14:07

I use KielC v5.17. If I delete static directive , do not have sine wave on my oscilloscope. 

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Tesla DeLorean
Guru

‎2016-05-10 05:43 AM

Posted on May 10, 2016 at 14:43

Nothing is really jumping out, any linker errors?

Try this 

#include <
stm32f4xx.h
>
#define OUT_FREQ 5000 // Output waveform frequency
#define SINE_RES 128 // Waveform resolution
#define DAC_DHR12R1_ADDR 0x40007408 // DMA writes into this reg on every request
#define CNT_FREQ 42000000 // TIM6 counter clock (prescaled APB1)
#define TIM_PERIOD ((CNT_FREQ)/((SINE_RES)*(OUT_FREQ))) // Autoreload reg value
const uint16_t function[SINE_RES] = { 2048, 2145, 2242, 2339, 2435, 2530, 2624, 2717, 2808, 2897,
2984, 3069, 3151, 3230, 3307, 3381, 3451, 3518, 3581, 3640,
3696, 3748, 3795, 3838, 3877, 3911, 3941, 3966, 3986, 4002,
4013, 4019, 4020, 4016, 4008, 3995, 3977, 3954, 3926, 3894,
3858, 3817, 3772, 3722, 3669, 3611, 3550, 3485, 3416, 3344,
3269, 3191, 3110, 3027, 2941, 2853, 2763, 2671, 2578, 2483,
2387, 2291, 2194, 2096, 1999, 1901, 1804, 1708, 1612, 1517,
1424, 1332, 1242, 1154, 1068, 985, 904, 826, 751, 679,
610, 545, 484, 426, 373, 323, 278, 237, 201, 169,
141, 118, 100, 87, 79, 75, 76, 82, 93, 109,
129, 154, 184, 218, 257, 300, 347, 399, 455, 514,
577, 644, 714, 788, 865, 944, 1026, 1111, 1198, 1287,
1378, 1471, 1565, 1660, 1756, 1853, 1950, 2047 }; 
void TIM6_Config(void);
void DAC1_Config(void); 
int main()
{
GPIO_InitTypeDef gpio_A = { 0 };
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_DMA1, ENABLE); 
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC | RCC_APB1Periph_TIM6, ENABLE);
gpio_A.GPIO_Pin = GPIO_Pin_4;
gpio_A.GPIO_Mode = GPIO_Mode_AN;
gpio_A.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &gpio_A);
TIM6_Config(); 
DAC1_Config();
while(1)
{
}
}
void TIM6_Config(void)
{
TIM_TimeBaseInitTypeDef TIM6_TimeBase;
TIM_TimeBaseStructInit(&TIM6_TimeBase);
TIM6_TimeBase.TIM_Period = (uint16_t)(TIM_PERIOD - 1); // 0 .. N-1 
TIM6_TimeBase.TIM_Prescaler = 0; 
TIM6_TimeBase.TIM_ClockDivision = 0; 
TIM6_TimeBase.TIM_CounterMode = TIM_CounterMode_Up; 
TIM_TimeBaseInit(TIM6, &TIM6_TimeBase);
TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update);
TIM_Cmd(TIM6, ENABLE);
}
void DAC1_Config(void)
{
DAC_InitTypeDef DAC_INIT = { 0 };
DMA_InitTypeDef DMA_INIT = { 0 };
DAC_INIT.DAC_Trigger = DAC_Trigger_T6_TRGO;
DAC_INIT.DAC_WaveGeneration = DAC_WaveGeneration_None;
DAC_INIT.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
DAC_Init(DAC_Channel_1, &DAC_INIT);
DMA_DeInit(DMA1_Stream5);
DMA_INIT.DMA_Channel = DMA_Channel_7; 
DMA_INIT.DMA_PeripheralBaseAddr = (uint32_t)DAC_DHR12R1_ADDR;
DMA_INIT.DMA_Memory0BaseAddr = (uint32_t)&function[0];
DMA_INIT.DMA_DIR = DMA_DIR_MemoryToPeripheral;
DMA_INIT.DMA_BufferSize = SINE_RES;
DMA_INIT.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_INIT.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_INIT.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_INIT.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_INIT.DMA_Mode = DMA_Mode_Circular;
DMA_INIT.DMA_Priority = DMA_Priority_High;
DMA_INIT.DMA_FIFOMode = DMA_FIFOMode_Disable; 
DMA_INIT.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
DMA_INIT.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_INIT.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA1_Stream5, &DMA_INIT);
DMA_Cmd(DMA1_Stream5, ENABLE);
DAC_Cmd(DAC_Channel_1, ENABLE);
DAC_DMACmd(DAC_Channel_1, ENABLE);
}

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hukhongcongtu26111993
Associate II

‎2016-05-10 06:08 AM

Posted on May 10, 2016 at 15:08

thanks for your suicide. I am going to test your code in tomorrow because i don't have any oscilloscope in my home.:). 

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hukhongcongtu26111993
Associate II

‎2016-05-10 07:19 PM

Posted on May 11, 2016 at 04:19

I was test your code and the result is correct. I received sine wave on my oscilloscope. but I don't understand why I did wrong. Can you tell me abotut that?

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hukhongcongtu26111993
Associate II

‎2016-05-10 07:40 PM

Posted on May 11, 2016 at 04:40

And why I need to set first value for 

GPIO_InitTypeDef gpio_A = { 0 }; 
DAC_InitTypeDef DAC_INIT = { 0 };
DMA_InitTypeDef DMA_INIT = { 0 };

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