main.c

00001 /**
00002   ******************************************************************************
00003   * @file    DMA_RAM_DAC/main.c 
00004   * @author  MCD Application Team
00005   * @version V1.0.0
00006   * @date    20-June-2014
00007   * @brief   Main program body
00008   ******************************************************************************
00009   * @attention
00010   *
00011   * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
00012   *
00013   * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
00014   * You may not use this file except in compliance with the License.
00015   * You may obtain a copy of the License at:
00016   *
00017   *        http://www.st.com/software_license_agreement_liberty_v2
00018   *
00019   * Unless required by applicable law or agreed to in writing, software 
00020   * distributed under the License is distributed on an "AS IS" BASIS, 
00021   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00022   * See the License for the specific language governing permissions and
00023   * limitations under the License.
00024   *
00025   ******************************************************************************
00026   */
00027 
00028 /* Includes ------------------------------------------------------------------*/
00029 #include "main.h"
00030 
00031 /** @addtogroup STM32F3348_DISCOVERY_Examples
00032   * @{
00033   */
00034 
00035 /** @addtogroup DMA_RAM_DAC
00036   * @{
00037   */ 
00038 
00039 /* Private typedef -----------------------------------------------------------*/
00040 /* Private define ------------------------------------------------------------*/
00041 /* Private macro -------------------------------------------------------------*/
00042 /* Private variables ---------------------------------------------------------*/
00043 uint32_t DualSine12bit[32];
00044 
00045 /* Private function prototypes -----------------------------------------------*/
00046 static void TIM_Config(void);
00047 static void DAC_Config(void);
00048 static void DMA_Config(void);
00049 
00050 /* Private functions ---------------------------------------------------------*/
00051 
00052 /**
00053   * @brief  Main program.
00054   * @param  None
00055   * @retval None
00056   */
00057 int main(void)
00058 {
00059   uint16_t Sine12bit[32] = {
00060                       2047, 2447, 2831, 3185, 3498, 3750, 3939, 4056, 4095, 4056,
00061                       3939, 3750, 3495, 3185, 2831, 2447, 2047, 1647, 1263, 909, 
00062                       599, 344, 155, 38, 0, 38, 155, 344, 599, 909, 1263, 1647}; 
00063   uint32_t Index = 0;
00064   
00065   /*!< At this stage the microcontroller clock setting is already configured, 
00066        this is done through SystemInit() function which is called from startup
00067        file (startup_stm32f334x8.s) before to branch to application main.
00068        To reconfigure the default setting of SystemInit() function, refer to
00069        system_stm32f30x.c file
00070      */
00071   
00072   /* Fill DualSine12bit table */
00073   for (Index = 0; Index < 32; Index++)
00074   {
00075     DualSine12bit[Index] = (Sine12bit[Index] << 16) + (Sine12bit[Index]);
00076   }
00077   
00078   /* DMA1 channel3 configuration: DualSine12bit is used as memory base address */
00079   DMA_Config();
00080 
00081   /* DAC configuration ------------------------------------------------------*/
00082   DAC_Config();
00083 
00084   /* TIM2 configuration ------------------------------------------------------*/
00085   TIM_Config();
00086 
00087   while (1)
00088   {
00089   }
00090 }
00091 
00092 /**
00093   * @brief  Configures the TIM2
00094   * @param  None
00095   * @retval None
00096   */
00097 static void TIM_Config(void)
00098 {
00099   TIM_TimeBaseInitTypeDef    TIM_TimeBaseStructure;
00100 
00101   /* TIM2 Periph clock enable */
00102   RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
00103 
00104   /* Time base configuration */
00105   TIM_TimeBaseStructInit(&TIM_TimeBaseStructure); 
00106   TIM_TimeBaseStructure.TIM_Period = 0xFF;         
00107   TIM_TimeBaseStructure.TIM_Prescaler = 0x0;       
00108   TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;    
00109   TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  
00110   TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
00111 
00112   /* TIM2 TRGO selection: update event is selected as trigger for DAC */
00113   TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);
00114 
00115   /* TIM2 enable counter */
00116   TIM_Cmd(TIM2, ENABLE);
00117 }
00118 
00119 /**
00120   * @brief  Configures DAC channel 1 and channel 2
00121   * @param  None
00122   * @retval None
00123   */
00124 static void DAC_Config(void)
00125 {
00126   DAC_InitTypeDef   DAC_InitStructure;
00127   GPIO_InitTypeDef  GPIO_InitStructure;
00128   
00129   /* DAC Periph clock enable ----------------------------------------*/
00130   RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
00131   
00132   /* SYSCFG Periph clock enable -------------------------------------*/
00133   RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
00134   
00135   /* Enable GPIOA Periph clock --------------------------------------*/
00136   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
00137   
00138   /* Configure PA.04 (DAC1_OUT1), PA.05 (DAC1_OUT2) as analog */
00139   GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_4 | GPIO_Pin_5;
00140   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
00141   GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
00142   GPIO_Init(GPIOA, &GPIO_InitStructure);
00143 
00144   /* Remap DAC1 Cahnnel1 DMA requests from DMA2 channel 3 to DMA1 channel 3 */
00145     SYSCFG_DMAChannelRemapConfig(SYSCFG_DMARemap_TIM6DAC1Ch1, ENABLE);
00146     
00147   /* DAC deinitialize */
00148   DAC_DeInit(DAC1);
00149     
00150   /* Fill DAC InitStructure */
00151   DAC_InitStructure.DAC_Trigger = DAC_Trigger_T2_TRGO;
00152   DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
00153   DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bits2_0;  
00154   DAC_InitStructure.DAC_Buffer_Switch = DAC_BufferSwitch_Enable;
00155   
00156   /* DAC channel1 Configuration */
00157   DAC_Init(DAC1, DAC_Channel_1, &DAC_InitStructure);
00158   
00159   /* DAC channel2 Configuration */
00160   DAC_Init(DAC1, DAC_Channel_2, &DAC_InitStructure);
00161   
00162   /* Enable DAC Channel1: Once the DAC channel1 is enabled, PA.04 is 
00163   automatically connected to the DAC converter. */
00164   DAC_Cmd(DAC1, DAC_Channel_1, ENABLE);
00165   
00166   /* Enable DAC Channel2: Once the DAC channel2 is enabled, PA.05 is 
00167   automatically connected to the DAC converter. */
00168   DAC_Cmd(DAC1, DAC_Channel_2, ENABLE);
00169   
00170   /* Enable DMA for DAC Channel1 */
00171   DAC_DMACmd(DAC1, DAC_Channel_1, ENABLE);
00172 }
00173 
00174 /**
00175   * @brief  Configures DMA1 channel3
00176   * @param  None
00177   * @retval None
00178   */
00179 static void DMA_Config(void)
00180 {
00181   DMA_InitTypeDef   DMA_InitStructure;
00182 
00183   /* Enable DMA1 clock -------------------------------------------------------*/
00184   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
00185 
00186   DMA_DeInit(DMA1_Channel3);
00187   DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12RD_Address;
00188   DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&DualSine12bit;
00189   DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
00190   DMA_InitStructure.DMA_BufferSize = 32;
00191   DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
00192   DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
00193   DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
00194   DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
00195   DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
00196   DMA_InitStructure.DMA_Priority = DMA_Priority_High;
00197   DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
00198   DMA_Init(DMA1_Channel3, &DMA_InitStructure);
00199 
00200   /* Enable DMA1 Channel3 */
00201   DMA_Cmd(DMA1_Channel3, ENABLE);
00202 }
00203 #ifdef  USE_FULL_ASSERT
00204 
00205 /**
00206   * @brief  Reports the name of the source file and the source line number
00207   *         where the assert_param error has occurred.
00208   * @param  file: pointer to the source file name
00209   * @param  line: assert_param error line source number
00210   * @retval None
00211   */
00212 void assert_failed(uint8_t* file, uint32_t line)
00213 { 
00214   /* User can add his own implementation to report the file name and line number,
00215      ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
00216 
00217   /* Infinite loop */
00218   while (1)
00219   {
00220   }
00221 }
00222 #endif
00223 
00224 /**
00225   * @}
00226   */
00227 
00228 /**
00229   * @}
00230   */
00231 
00232 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/