Tutorial Microcontroller MCS-51 ATMEL ISP
 

 

Super MCS51 Trainer

Standart MCS51 Trainer

Standart AVR Trainer

Programmer USBASP

Standart ARM Trainer

 

STM32 F4 DAC Waveform Generator

 

 



#include "stm32f4_discovery.h"

/**************************************************************************/

const uint16_t Sine12bit[32] = {
2047, 2447, 2831, 3185,
3498, 3750, 3939, 4056,
4095, 4056, 3939, 3750,
3495, 3185, 2831, 2447,
2047, 1647, 1263, 909,
599, 344, 155, 38,
0, 38, 155, 344,
599, 909, 1263, 1647};

uint16_t SineTable[64];

/**************************************************************************/

void RCC_Config(void)
{
/* DMA1 clock and GPIOA clock enable (to be used with DAC) */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1 | RCC_AHB1Periph_GPIOA, ENABLE);

/* DAC and TIM6 Peripheral clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC | RCC_APB1Periph_TIM6, ENABLE);
}

/**************************************************************************/

void GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

/* DAC channel 1 & 2 (DAC_OUT1 = PA.4)(DAC_OUT2 = PA.5) configuration */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}

/**************************************************************************/

void TIM6_Config(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
int Period;

Period = ((SystemCoreClock / 2) / 200000); // 200 KHz timebase, 6.25 KHz Sine

/* Time base configuration */
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = Period - 1;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM6, &TIM_TimeBaseStructure);

/* TIM6 TRGO selection */
TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update);

/* TIM6 enable counter */
TIM_Cmd(TIM6, ENABLE);
}

/**************************************************************************/

#define DAC_DHR12RD_ADDRESS 0x40007428 // Right Align 12-bit Dual

void DAC_Config(void)
{
DAC_InitTypeDef DAC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;

/* DAC channel 1 and 2 Configuration */
DAC_InitStructure.DAC_Trigger = DAC_Trigger_T6_TRGO;
DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
DAC_Init(DAC_Channel_1, &DAC_InitStructure);
DAC_Init(DAC_Channel_2, &DAC_InitStructure);

/* DMA1_Stream5 channel7 configuration **************************************/
DMA_DeInit(DMA1_Stream5);
DMA_InitStructure.DMA_Channel = DMA_Channel_7;
DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12RD_ADDRESS;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&SineTable[0];
DMA_InitStructure.DMA_BufferSize = 32; // 16-bit x 64 / 2
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;// 32-bit 16x2
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA1_Stream5, &DMA_InitStructure);

/* Enable DMA1_Stream5 */
DMA_Cmd(DMA1_Stream5, ENABLE);

/* Enable DAC Channel 1 and 2 */
DAC_Cmd(DAC_Channel_1, ENABLE);
DAC_Cmd(DAC_Channel_2, ENABLE);

/* Enable DMA for DAC Channel1 */
DAC_DMACmd(DAC_Channel_1, ENABLE);
}

/**************************************************************************/

int main(void)
{
int i, j;

j = 0;

for(i=0; i<32; i++)
{
SineTable[j++] = Sine12bit[i];
SineTable[j++] = Sine12bit[(i + 8) % 32]; //90 degree phase shift on Channel 2
}

RCC_Config();

GPIO_Config();

TIM6_Config();

DAC_Config();

while(1); // Do not exit
}