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STM32F0xx Standard Peripherals Firmware Library
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STM32F0xx_StdPeriph_Examples/FLASH/Flash_WriteProtection/main.c
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00001 /** 00002 ****************************************************************************** 00003 * @file FLASH/FLASH_WriteProtection/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 FLASH_WriteProtection 00036 * @{ 00037 */ 00038 00039 /* Private typedef -----------------------------------------------------------*/ 00040 typedef enum {FAILED = 0, PASSED = !FAILED} TestStatus; 00041 00042 /* Private define ------------------------------------------------------------*/ 00043 #ifdef STM32F072 00044 #define FLASH_PAGE_SIZE ((uint16_t)0x800) 00045 #define FLASH_PAGES_TO_BE_PROTECTED (OB_WRP_Pages22to23 | OB_WRP_Pages24to25 | OB_WRP_Pages26to27 |\ 00046 OB_WRP_Pages28to29 | OB_WRP_Pages30to31 | OB_WRP_Pages32to33 |\ 00047 OB_WRP_Pages34to35 | OB_WRP_Pages60to61 | OB_WRP_Pages62to63|\ 00048 OB_WRP_Pages54to55 | OB_WRP_Pages52to53 | OB_WRP_Pages58to59/*|OB_WRP_AllPages*/) 00049 #define BANK1_WRITE_START_ADDR ((uint32_t)0x08006000) 00050 #define BANK1_WRITE_END_ADDR ((uint32_t)0x08008000) 00051 #elif defined (STM32F091) 00052 #define FLASH_PAGE_SIZE ((uint16_t)0x800) 00053 #define FLASH_PAGES_TO_BE_PROTECTED (OB_WRP_Pages28to29 | OB_WRP_Pages30to31 | OB_WRP_Pages32to33 |\ 00054 OB_WRP_Pages34to35 | OB_WRP_Pages60to61 | OB_WRP_Pages62to127) 00055 00056 #define BANK1_WRITE_START_ADDR ((uint32_t)0x08006000) 00057 #define BANK1_WRITE_END_ADDR ((uint32_t)0x08040000) 00058 00059 #else 00060 #define FLASH_PAGE_SIZE ((uint16_t)0x400) 00061 #define FLASH_PAGES_TO_BE_PROTECTED (OB_WRP_Pages20to23 | OB_WRP_Pages44to47 | OB_WRP_Pages60to63) 00062 00063 #define BANK1_WRITE_START_ADDR ((uint32_t)0x08006000) 00064 #define BANK1_WRITE_END_ADDR ((uint32_t)0x08008000) 00065 #endif /* STM32F072 */ 00066 00067 00068 00069 00070 /* Uncomment this line to program the Flash pages */ 00071 #define FLASH_PAGE_PROGRAM 00072 00073 /* Uncomment this line to Enable Write Protection */ 00074 //#define WRITE_PROTECTION_ENABLE 00075 00076 /* Uncomment this line to Disable Write Protection */ 00077 //#define WRITE_PROTECTION_DISABLE 00078 00079 /* Private macro -------------------------------------------------------------*/ 00080 /* Private variables ---------------------------------------------------------*/ 00081 uint32_t EraseCounter = 0x0, Address = 0x0; 00082 uint16_t Data = 0x1753; 00083 uint32_t WRPR_Value = 0xFFFFFFFF, ProtectedPages = 0x0; 00084 uint32_t NbrOfPage; 00085 __IO FLASH_Status FLASHStatus = FLASH_COMPLETE; 00086 __IO TestStatus MemoryProgramStatus = PASSED; 00087 00088 /* Private function prototypes -----------------------------------------------*/ 00089 /* Private functions ---------------------------------------------------------*/ 00090 00091 /** 00092 * @brief Main program. 00093 * @param None 00094 * @retval None 00095 */ 00096 int main(void) 00097 { 00098 /*!< At this stage the microcontroller clock setting is already configured, 00099 this is done through SystemInit() function which is called from startup 00100 file (startup_stm32f0xx.s) before to branch to application main. 00101 To reconfigure the default setting of SystemInit() function, refer to 00102 system_stm32f0xx.c file 00103 */ 00104 00105 /* Unlock the Flash Program Erase controller */ 00106 FLASH_Unlock(); 00107 00108 FLASH_OB_Unlock(); 00109 00110 FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_PGERR | FLASH_FLAG_WRPERR); 00111 00112 /* Get pages write protection status */ 00113 WRPR_Value = FLASH_OB_GetWRP(); 00114 00115 #ifdef WRITE_PROTECTION_DISABLE 00116 /* Get pages already write protected */ 00117 ProtectedPages = ~(WRPR_Value | FLASH_PAGES_TO_BE_PROTECTED); 00118 00119 /* Check if desired pages are already write protected */ 00120 if((WRPR_Value | (~FLASH_PAGES_TO_BE_PROTECTED)) != 0xFFFFFFFF ) 00121 { 00122 /* Erase all the option Bytes */ 00123 FLASHStatus = FLASH_OB_Erase(); 00124 00125 /* Check if there is write protected pages */ 00126 if(ProtectedPages != 0x0) 00127 { 00128 /* Restore write protected pages */ 00129 FLASHStatus = FLASH_OB_EnableWRP(ProtectedPages); 00130 } 00131 /* Generate System Reset to load the new option byte values */ 00132 FLASH_OB_Launch(); 00133 } 00134 00135 #elif defined WRITE_PROTECTION_ENABLE 00136 /* Get current write protected pages and the new pages to be protected */ 00137 ProtectedPages = (~WRPR_Value) | FLASH_PAGES_TO_BE_PROTECTED; 00138 00139 /* Check if desired pages are not yet write protected */ 00140 if(((~WRPR_Value) & FLASH_PAGES_TO_BE_PROTECTED )!= FLASH_PAGES_TO_BE_PROTECTED) 00141 { 00142 00143 /* Erase all the option Bytes because if a program operation is 00144 performed on a protected page, the Flash memory returns a 00145 protection error */ 00146 FLASHStatus = FLASH_OB_Erase(); 00147 00148 /* Enable the pages write protection */ 00149 FLASHStatus = FLASH_OB_EnableWRP(ProtectedPages); 00150 00151 /* Generate System Reset to load the new option byte values */ 00152 FLASH_OB_Launch(); 00153 } 00154 #endif /* WRITE_PROTECTION_DISABLE */ 00155 00156 #ifdef FLASH_PAGE_PROGRAM 00157 /* Get the number of pages to be erased */ 00158 NbrOfPage = (BANK1_WRITE_END_ADDR - BANK1_WRITE_START_ADDR) / FLASH_PAGE_SIZE; 00159 00160 /* The selected pages are not write protected */ 00161 if ( (WRPR_Value & FLASH_PAGES_TO_BE_PROTECTED) != 0x00) 00162 { 00163 /* Clear pending flags */ 00164 FLASH_ClearFlag(FLASH_FLAG_EOP|FLASH_FLAG_PGERR |FLASH_FLAG_WRPERR); 00165 00166 /* erase the FLASH pages */ 00167 for(EraseCounter = 0; (EraseCounter < NbrOfPage) && (FLASHStatus == FLASH_COMPLETE); EraseCounter++) 00168 { 00169 FLASHStatus = FLASH_ErasePage(BANK1_WRITE_START_ADDR + (FLASH_PAGE_SIZE * EraseCounter)); 00170 } 00171 00172 /* FLASH Half Word program of data 0x1753 at addresses defined by BANK1_WRITE_START_ADDR and BANK1_WRITE_END_ADDR */ 00173 Address = BANK1_WRITE_START_ADDR; 00174 00175 while((Address < BANK1_WRITE_END_ADDR) && (FLASHStatus == FLASH_COMPLETE)) 00176 { 00177 FLASHStatus = FLASH_ProgramHalfWord(Address, Data); 00178 Address = Address + 2; 00179 } 00180 00181 /* Check the correctness of written data */ 00182 Address = BANK1_WRITE_START_ADDR; 00183 00184 while((Address < BANK1_WRITE_END_ADDR) && (MemoryProgramStatus != FAILED)) 00185 { 00186 if((*(__IO uint16_t*) Address) != Data) 00187 { 00188 MemoryProgramStatus = FAILED; 00189 } 00190 Address += 2; 00191 } 00192 } 00193 else 00194 { 00195 /* Error to program the flash : The desired pages are write protected */ 00196 MemoryProgramStatus = FAILED; 00197 } 00198 #endif /* FLASH_PAGE_PROGRAM */ 00199 00200 while (1) 00201 { 00202 } 00203 } 00204 00205 00206 #ifdef USE_FULL_ASSERT 00207 00208 /** 00209 * @brief Reports the name of the source file and the source line number 00210 * where the assert_param error has occurred. 00211 * @param file: pointer to the source file name 00212 * @param line: assert_param error line source number 00213 * @retval None 00214 */ 00215 void assert_failed(uint8_t* file, uint32_t line) 00216 { 00217 /* User can add his own implementation to report the file name and line number, 00218 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ 00219 00220 /* Infinite loop */ 00221 while (1) 00222 { 00223 } 00224 } 00225 #endif 00226 00227 /** 00228 * @} 00229 */ 00230 00231 /** 00232 * @} 00233 */ 00234 00235 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/