Forum : ARM
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March 7, 2016 - 7:24pm
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Hello, i'm trying this code to generate a sinus signal but it doesn't work in 12bit. In 8 bit no problem. is there someone can help me please ? //**************************************************************************************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};//**************************************************************************************void GPIO_Configuration(void){ GPIO_InitTypeDef GPIO_InitStructure; /* GPIOA Periph clock enable */ RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE); /* Configure PA4 in analogue (output) mode */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; /* overkill? */ GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA, &GPIO_InitStructure);}//**************************************************************************************void TIM_Configuration(void){ TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; int Period; /* TIM2 Periph clock enable */ RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); Period = (SystemCoreClock / (20000 * 32)); // 20 KHz Sine, 32 sample wave table /* Time base configuration */ TIM_TimeBaseStructure.TIM_Period = Period - 1; TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_ClockDivision = 0; // not relevant here TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); /* TIM2 TRGO selection: update event is selected as trigger for DAC */ TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update); /* TIM2 enable counter */ TIM_Cmd(TIM2, ENABLE);}//**************************************************************************************void DAC_Configuration(void){ DAC_InitTypeDef DAC_InitStructure; /* DAC Periph clock enable */ RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE); /* Fill DAC InitStructure */ DAC_InitStructure.DAC_Trigger = DAC_Trigger_T2_TRGO; /* Select the receiving end */ DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable; /* DAC channel1 Configuration */ DAC_Init(DAC_Channel_1, &DAC_InitStructure); /* Enable DAC Channel1: Once the DAC channel1 is enabled, PA.04 is automatically connected to the DAC converter. */ DAC_Cmd(DAC_Channel_1, ENABLE); /* Enable DMA for DAC Channel2 */ DAC_DMACmd(DAC_Channel_1, ENABLE);}//**************************************************************************************void DMA_Configuration(void){ DMA_InitTypeDef DMA_InitStructure; /* Enable DMA1 clock */ RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); DMA_DeInit(DMA1_Channel3); DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&DAC->DHR12R1; DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&Sine12bit; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; DMA_InitStructure.DMA_BufferSize = 32; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; // 16-bit 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_Channel3, &DMA_InitStructure); /* Enable DMA1 Channel3 */ DMA_Cmd(DMA1_Channel3, ENABLE);}//**************************************************************************************int main(void){ GPIO_Configuration(); DMA_Configuration(); DAC_Configuration(); TIM_Configuration(); /* Infinite loop */ while(1);}//**************************************************************************************#ifdef USE_FULL_ASSERT/** * @brief Reports the name of the source file and the source line number * where the assert_param error has occurred. * @param file: pointer to the source file name * @param line: assert_param error line source number * @retval None */void assert_failed(uint8_t* file, uint32_t line){ /* User can add his own implementation to report the file name and line number, ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ /* Infinite loop */ while (1) { }}#endif |