STM32F0xx Standard Peripherals Firmware Library: main.c Source File

00001 /**
00002   ******************************************************************************
00003   * @file    DMA/DMA_RAMDACTransfer/main.c  
00004   * @author  MCD Application Team
00005   * @version V1.4.0
00006   * @date    24-July-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 STM32F0xx_StdPeriph_Examples
00032   * @{
00033   */
00034 
00035 /** @addtogroup DMA_RAMDACTransfer
00036   * @{
00037   */
00038 
00039 /* Private typedef -----------------------------------------------------------*/
00040 /* Private define ------------------------------------------------------------*/
00041 #define DAC_DHR12R_Address      0x40007408
00042 
00043 /* Private macro -------------------------------------------------------------*/
00044 /* Private variables ---------------------------------------------------------*/
00045 uint16_t Sine12bit[32] = {
00046                       2047, 2447, 2831, 3185, 3498, 3750, 3939, 4056, 4095, 4056,
00047                       3939, 3750, 3495, 3185, 2831, 2447, 2047, 1647, 1263, 909, 
00048                       599, 344, 155, 38, 0, 38, 155, 344, 599, 909, 1263, 1647};
00049 
00050 /* Private function prototypes -----------------------------------------------*/
00051 static void TIM_Config(void);
00052 static void DAC_Config(void);
00053 static void DMA_Config(void);
00054 
00055 /* Private functions ---------------------------------------------------------*/
00056 
00057 /**
00058   * @brief  Main program.
00059   * @param  None
00060   * @retval None
00061   */
00062 int main(void)
00063 {
00064   /*!< At this stage the microcontroller clock setting is already configured, 
00065        this is done through SystemInit() function which is called from startup
00066        file (startup_stm32f0xx.s) before to branch to application main.
00067        To reconfigure the default setting of SystemInit() function, refer to
00068        system_stm32f0xx.c file
00069      */ 
00070 
00071   /* DMA1 channel3 configuration: Sine12bit is used as memory base address */
00072   DMA_Config();
00073 
00074   /* DAC configuration ------------------------------------------------------*/
00075   DAC_Config();
00076 
00077   /* TIM2 configuration ------------------------------------------------------*/
00078   TIM_Config();
00079 
00080   while (1)
00081   {
00082   }
00083 }
00084 
00085 /**
00086   * @brief  Configures the TIM2
00087   * @param  None
00088   * @retval None
00089   */
00090 static void TIM_Config(void)
00091 {
00092   TIM_TimeBaseInitTypeDef    TIM_TimeBaseStructure;
00093 
00094   /* TIM2 Periph clock enable */
00095   RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
00096 
00097   /* Time base configuration */
00098   TIM_TimeBaseStructInit(&TIM_TimeBaseStructure); 
00099   TIM_TimeBaseStructure.TIM_Period = 48;         
00100   TIM_TimeBaseStructure.TIM_Prescaler = 0x0;       
00101   TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;    
00102   TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  
00103   TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
00104 
00105   /* TIM2 TRGO selection: update event is selected as trigger for DAC */
00106   TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);
00107 
00108   /* TIM2 enable counter */
00109   TIM_Cmd(TIM2, ENABLE);
00110 }
00111 
00112 /**
00113   * @brief  Configures DAC channel 1
00114   * @param  None
00115   * @retval None
00116   */
00117 static void DAC_Config(void)
00118 {
00119   GPIO_InitTypeDef  GPIO_InitStructure;
00120   DAC_InitTypeDef   DAC_InitStructure;
00121   
00122   /* Enable GPIOA Periph clock --------------------------------------*/
00123   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
00124   
00125   /* Configure PA.04 DAC_OUT as analog */
00126   GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_4 ;
00127   GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;
00128   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
00129   GPIO_Init(GPIOA, &GPIO_InitStructure);
00130 
00131   /* DAC Periph clock enable */
00132   RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
00133 
00134   /* Fill DAC InitStructure */
00135   DAC_InitStructure.DAC_Trigger = DAC_Trigger_T2_TRGO;
00136   DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
00137   DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bit0;
00138   DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;
00139 
00140   /* DAC channel1 Configuration */
00141   DAC_Init(DAC_Channel_1, &DAC_InitStructure);
00142 
00143   /* Enable DAC Channel1: Once the DAC channel1 is enabled, PA.04 is 
00144      automatically connected to the DAC converter. */
00145   DAC_Cmd(DAC_Channel_1, ENABLE);
00146 
00147   /* Enable DMA for DAC Channel1 */
00148   DAC_DMACmd(DAC_Channel_1, ENABLE);
00149 }
00150 
00151 /**
00152   * @brief  Configures DMA1 channel3
00153   * @param  None
00154   * @retval None
00155   */
00156 static void DMA_Config(void)
00157 {
00158   DMA_InitTypeDef   DMA_InitStructure;
00159   
00160   /* Enable DMA1 clock -------------------------------------------------------*/
00161   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
00162 
00163   DMA_DeInit(DMA1_Channel3);
00164   DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12R_Address;
00165   DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&Sine12bit;
00166   DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
00167   DMA_InitStructure.DMA_BufferSize = 32;
00168   DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
00169   DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
00170   DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
00171   DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
00172   DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
00173   DMA_InitStructure.DMA_Priority = DMA_Priority_High;
00174   DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
00175   DMA_Init(DMA1_Channel3, &DMA_InitStructure);
00176 
00177   /* Enable DMA1 Channel3 */
00178   DMA_Cmd(DMA1_Channel3, ENABLE);
00179 }
00180 
00181 #ifdef  USE_FULL_ASSERT
00182 
00183 /**
00184   * @brief  Reports the name of the source file and the source line number
00185   *         where the assert_param error has occurred.
00186   * @param  file: pointer to the source file name
00187   * @param  line: assert_param error line source number
00188   * @retval None
00189   */
00190 void assert_failed(uint8_t* file, uint32_t line)
00191 {
00192   /* User can add his own implementation to report the file name and line number,
00193      ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
00194 
00195   /* Infinite loop */
00196   while (1)
00197   {
00198   }
00199 }
00200 #endif
00201 
00202 /**
00203   * @}
00204   */
00205 
00206 /**
00207   * @}
00208   */
00209 
00210 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/