void DacInit(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
DAC_InitTypeDef DAC_InitStructure;
DacSinusCalculate();
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
RCC_AHBPeriphClockCmd(GENERATOR_PIN_CLK, ENABLE);
RCC_APB1PeriphClockCmd(GENERATOR_TIMER_CLK, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GENERATOR_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GENERATOR_PORT, &GPIO_InitStructure);
DAC_StructInit(&DAC_InitStructure);
DAC_InitStructure.DAC_Trigger = DAC_Trigger_None;
DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
DAC_Init(DAC_Channel_1, &DAC_InitStructure);
//delay_us(100);
DAC_Cmd(DAC_Channel_1, ENABLE);
DAC_SetChannel1Data(DAC_Align_12b_R, DAC_ZERO);
}
// sinusPeriod in SystemCoreClock quants
void DacSetPeriod(uint32_t sinusPeriod, uint16_t amplitude)
{
g_dac_amplitude = amplitude;
if(sinusPeriod<MIN_SINUS_PERIOD)
sinusPeriod = MIN_SINUS_PERIOD;
if(sinusPeriod>DAC_BUFFER_SIZE)
sinusPeriod = DAC_BUFFER_SIZE;
DacDeinitDmaAndTimer();
SinusBufferSize = sinusPeriod;
DacSinusCalculate();
//DacSquareCalculate();
DacInitDmaAndTimer();
}
/**
** sinusPeriod in SystemCoreClock quants
**/
void DacSetPeriod(uint32_t sinusPeriod, uint16_t amplitude)
{
uint32_t prescaler = 1;
uint32_t period = 24;
DMA_InitTypeDef DMA_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
g_dac_amplitude = amplitude;
if (sinusPeriod < MIN_SINUS_PERIOD)
sinusPeriod = MIN_SINUS_PERIOD;
// assert_param(frequency >= 100 && frequency <= 200000);
DMA_Cmd(DMA1_Channel2, DISABLE);
TIM_Cmd(GENERATOR_TIMER, DISABLE);
DAC_SetChannel1Data(DAC_Align_12b_R, DAC_ZERO);
// SinusBufferSize must be multiply by 4
sinusPeriod = (sinusPeriod / (period * 4)) * period * 4;
// Пусть будет не кратным 4, попробуем частоту 100 КГц
// sinusPeriod = (sinusPeriod / period) * period;
SinusBufferSize = sinusPeriod / period;
if (SinusBufferSize > SINUS_BUFFER_SIZE)
{
uint32_t p4;
// period = 72;
prescaler = sinusPeriod / period / SINUS_BUFFER_SIZE;
while (SINUS_BUFFER_SIZE * prescaler * period < sinusPeriod)
{
prescaler++;
}
p4 = period * prescaler * 4;
sinusPeriod = (sinusPeriod / p4) * p4;
SinusBufferSize = sinusPeriod / period / prescaler;
}
DacSinusCalculate();
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&DAC->DHR12R1;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&g_sinusBuffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_BufferSize = SinusBufferSize;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel2, &DMA_InitStructure);
DMA_Cmd(DMA1_Channel2, ENABLE);
// 72 MHz / TIM_Prescaler / TIM_Period
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = period - 1;
TIM_TimeBaseStructure.TIM_Prescaler = prescaler - 1;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(GENERATOR_TIMER, &TIM_TimeBaseStructure);
TIM_SetCounter(GENERATOR_TIMER, 0);
TIM_DMACmd(GENERATOR_TIMER, TIM_DMA_Update, ENABLE);
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 1;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
#ifdef USE_ADC12
TIM_OC2Init(GENERATOR_TIMER, &TIM_OCInitStructure); // ADC1 EXT3
#else
TIM_OC3Init(GENERATOR_TIMER, &TIM_OCInitStructure); // ADC3 EXT1
#endif
g_dac_period = period * prescaler * SinusBufferSize;
}
