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STM32F0xx Standard Peripherals Firmware Library
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STM32F0xx_StdPeriph_Examples/COMP/COMP_LDR/main.c
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00001 /** 00002 ****************************************************************************** 00003 * @file COMP/COMP_LDR/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>© 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 COMP_LDR 00036 * @{ 00037 */ 00038 00039 /* Private typedef -----------------------------------------------------------*/ 00040 /* Private define ------------------------------------------------------------*/ 00041 #define MESSAGE1 " LDR " 00042 00043 /* Private macro -------------------------------------------------------------*/ 00044 /* Private variables ---------------------------------------------------------*/ 00045 uint8_t ldrlevel = 11, ldrlevelp = 0, daclevel = 0; 00046 uint16_t tmp = 0; 00047 00048 /* Private function prototypes -----------------------------------------------*/ 00049 /* Private functions ---------------------------------------------------------*/ 00050 static void COMP_Config(void); 00051 static void DAC_Config(void); 00052 void Delay(__IO uint32_t nTime); 00053 00054 /** 00055 * @brief Main program. 00056 * @param None 00057 * @retval None 00058 */ 00059 int main(void) 00060 { 00061 /*!< At this stage the microcontroller clock setting is already configured, 00062 this is done through SystemInit() function which is called from startup 00063 file (startup_stm32f0xx.s) before to branch to application main. 00064 To reconfigure the default setting of SystemInit() function, refer to 00065 system_stm32f0xx.c file 00066 */ 00067 00068 00069 /* Initialize the TFT-LCD */ 00070 #ifdef USE_STM320518_EVAL 00071 STM320518_LCD_Init(); 00072 #else 00073 STM32072B_LCD_Init(); 00074 #endif /* USE_STM320518_EVAL */ 00075 00076 /* Clear the LCD */ 00077 LCD_Clear(LCD_COLOR_BLACK); 00078 00079 /* Set the LCD Back Color */ 00080 LCD_SetBackColor(LCD_COLOR_BLACK); 00081 00082 /* Set the LCD Text Color */ 00083 LCD_SetTextColor(LCD_COLOR_WHITE); 00084 00085 /* Displays Light dependent resistor (LDR) message on line 1 */ 00086 LCD_DisplayStringLine(LINE(0), (uint8_t *)MESSAGE1); 00087 00088 /* COMP Configuration */ 00089 COMP_Config(); 00090 00091 /* AC channel 2 Configuration */ 00092 DAC_Config(); 00093 00094 00095 /* Infinite loop */ 00096 while (1) 00097 { 00098 for(daclevel = 0; daclevel < 11; daclevel++) 00099 { 00100 /* Set DAC Channel2 DHR register: DAC_OUT2 = (3.3 * 868) / 4095 ~ 0.7 V */ 00101 DAC_SetChannel1Data(DAC_Align_12b_R, (uint16_t)(daclevel * 150)); 00102 00103 Delay((10000)); 00104 /* Check on the Comp output level*/ 00105 if (COMP_GetOutputLevel(COMP_Selection_COMP1) == COMP_OutputLevel_High) 00106 { 00107 ldrlevel--; 00108 } 00109 } 00110 00111 switch(ldrlevel) 00112 { 00113 case 1: 00114 /* Displays MESSAGE on line 7 */ 00115 LCD_DisplayStringLine(LINE(7), " Level 0 "); 00116 break; 00117 00118 case 2: 00119 /* Displays MESSAGE on line 7 */ 00120 LCD_DisplayStringLine(LINE(7), " Level 1 "); 00121 break; 00122 00123 case 3: 00124 /* Displays MESSAGE on line 7 */ 00125 LCD_DisplayStringLine(LINE(7), " Level 2 "); 00126 break; 00127 00128 case 4: 00129 /* Displays MESSAGE on line 7 */ 00130 LCD_DisplayStringLine(LINE(7), " Level 3 "); 00131 break; 00132 00133 case 5: 00134 /* Displays MESSAGE on line 7 */ 00135 LCD_DisplayStringLine(LINE(7), " Level 4 "); 00136 break; 00137 00138 case 6: 00139 /* Displays MESSAGE on line 7 */ 00140 LCD_DisplayStringLine(LINE(7), " Level 5 "); 00141 break; 00142 00143 case 7: 00144 /* Displays MESSAGE on line 7 */ 00145 LCD_DisplayStringLine(LINE(7), " Level 6 "); 00146 break; 00147 00148 case 8: 00149 /* Displays MESSAGE on line 7 */ 00150 LCD_DisplayStringLine(LINE(7), " Level 7 "); 00151 break; 00152 00153 case 9: 00154 /* Displays MESSAGE on line 7 */ 00155 LCD_DisplayStringLine(LINE(7), " Level 8 "); 00156 break; 00157 00158 case 10: 00159 /* Displays MESSAGE on line 7 */ 00160 LCD_DisplayStringLine(LINE(7), " Level 9 "); 00161 break; 00162 00163 case 11: 00164 /* Displays MESSAGE on line 7 */ 00165 LCD_DisplayStringLine(LINE(7), " Level 10 "); 00166 break; 00167 00168 default : 00169 /* Displays MESSAGE on line 7 */ 00170 LCD_DisplayStringLine(LINE(7), " Level 0 "); 00171 ldrlevel = 1; 00172 break; 00173 } 00174 00175 if(ldrlevelp != ldrlevel) 00176 { 00177 /* Set the LCD Text Color */ 00178 LCD_SetTextColor(LCD_COLOR_WHITE); 00179 00180 /* Displays a rectangle on the LCD */ 00181 LCD_DrawRect(199, 311, 22, 302 ); 00182 00183 /* Set the LCD Back Color */ 00184 LCD_SetBackColor(LCD_COLOR_BLACK); 00185 LCD_SetTextColor(LCD_COLOR_BLACK); 00186 LCD_DrawFullRect(200, 310, 300, 20); 00187 00188 /* Set the LCD Text Color */ 00189 LCD_SetTextColor(LCD_COLOR_YELLOW); 00190 00191 /* Set the LCD Back Color */ 00192 LCD_SetBackColor(LCD_COLOR_YELLOW); 00193 00194 /* Displays a full rectangle */ 00195 tmp = 30 * (ldrlevel-1); 00196 if (tmp ==0) tmp = 5; 00197 LCD_DrawFullRect(200, 310, tmp , 20); 00198 } 00199 00200 ldrlevelp = ldrlevel; 00201 ldrlevel = 11; 00202 00203 /* Set the LCD Back Color */ 00204 LCD_SetBackColor(LCD_COLOR_BLACK); 00205 } 00206 00207 } 00208 00209 /** 00210 * @brief COMP Configuration. 00211 * @param None 00212 * @retval None 00213 */ 00214 static void COMP_Config(void) 00215 { 00216 COMP_InitTypeDef COMP_InitStructure; 00217 GPIO_InitTypeDef GPIO_InitStructure; 00218 00219 /* GPIOB Peripheral clock enable */ 00220 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE); 00221 00222 /* Configure PA1 in analog mode: PA1 is connected to COMP1 non inverting input */ 00223 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; 00224 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; 00225 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; 00226 GPIO_Init(GPIOA, &GPIO_InitStructure); 00227 00228 /* Enable SYSCFG clock */ 00229 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); 00230 00231 /* COMP1 Init: COMP1 is enabled as soon as inverting input is selected */ 00232 /* use DAC1 output as a reference voltage: DAC1 output is connected to COMP1 00233 inverting input */ 00234 COMP_InitStructure.COMP_InvertingInput = COMP_InvertingInput_DAC1; 00235 COMP_InitStructure.COMP_Output = COMP_Output_None; 00236 COMP_InitStructure.COMP_OutputPol = COMP_OutputPol_NonInverted; 00237 COMP_InitStructure.COMP_Hysteresis = COMP_Hysteresis_High; 00238 COMP_InitStructure.COMP_Mode = COMP_Mode_UltraLowPower; 00239 COMP_Init(COMP_Selection_COMP1, &COMP_InitStructure); 00240 00241 /* Enable the COMP peripheral */ 00242 COMP_Cmd(COMP_Selection_COMP1, ENABLE); 00243 } 00244 00245 /** 00246 * @brief Configures the DAC channel 2 with output buffer enabled. 00247 * @param None 00248 * @retval None 00249 */ 00250 static void DAC_Config(void) 00251 { 00252 DAC_InitTypeDef DAC_InitStructure; 00253 00254 /* DAC clock enable */ 00255 RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE); 00256 00257 /* Deinitialize DAC */ 00258 DAC_DeInit(); 00259 00260 DAC_StructInit(&DAC_InitStructure); 00261 00262 /* Fill DAC InitStructure */ 00263 /* DAC Channel1: 12bit right */ 00264 /* DAC Channel1 Init */ 00265 DAC_InitStructure.DAC_Trigger = DAC_Trigger_None; 00266 DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable; 00267 DAC_Init(DAC_Channel_1, &DAC_InitStructure); 00268 00269 /* Enable DAC Channel1 */ 00270 DAC_Cmd(DAC_Channel_1, ENABLE); 00271 } 00272 00273 /** 00274 * @brief Inserts a delay time. 00275 * @param nTime: specifies the delay time length. 00276 * @retval None 00277 */ 00278 void Delay(__IO uint32_t nTime) 00279 { 00280 while(nTime != 0) 00281 { 00282 nTime--; 00283 } 00284 } 00285 00286 #ifdef USE_FULL_ASSERT 00287 00288 /** 00289 * @brief Reports the name of the source file and the source line number 00290 * where the assert_param error has occurred. 00291 * @param file: pointer to the source file name 00292 * @param line: assert_param error line source number 00293 * @retval None 00294 */ 00295 void assert_failed(uint8_t* file, uint32_t line) 00296 { 00297 /* User can add his own implementation to report the file name and line number, 00298 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ 00299 00300 /* Infinite loop */ 00301 while (1) 00302 { 00303 } 00304 } 00305 #endif 00306 00307 /** 00308 * @} 00309 */ 00310 00311 /** 00312 * @} 00313 */ 00314 00315 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/