STM32G474 Flash读写 仿LL库写的，仅供参考

#include "stm32g4xx_ll_flash.h" //***************************************************************************** //功能: 解锁 //说明: //***************************************************************************** uint8_t FLASH_Unlock(void) { if(READ_BIT(FLASH->CR, FLASH_CR_LOCK) != 0U) { WRITE_REG(FLASH->KEYR, FLASH_KEY1); WRITE_REG(FLASH->KEYR, FLASH_KEY2); if(READ_BIT(FLASH->CR, FLASH_CR_LOCK) != 0U) return ERROR; } return SUCCESS; } //***************************************************************************** //功能: 上锁 //说明: //***************************************************************************** void FLASH_Lock(void) { SET_BIT(FLASH->CR, FLASH_CR_LOCK); } //***************************************************************************** //功能: 操作开始动作 //说明: //操作: 擦除,写入 //***************************************************************************** void Flash_ActionStart(void) { __disable_irq(); // 全局中断关闭 FLASH_Unlock(); // Flash解锁 FLASH_INSTRUCTION_CACHE_DISABLE;// 关闭指令缓存 FLASH_DATA_CACHE_DISABLE; // 关闭数据缓存 } //***************************************************************************** //功能: 操作结束动作 //操作: 擦除,写入 //***************************************************************************** void Flash_ActionEnd(void) { FLASH_INSTRUCTION_CACHE_RESET; FLASH_INSTRUCTION_CACHE_ENABLE; FLASH_DATA_CACHE_RESET; FLASH_DATA_CACHE_ENABLE; FLASH_Lock(); __enable_irq(); } //***************************************************************************** //功能: 等待不忙 //说明: //***************************************************************************** ErrorStatus FLASH_WaitForLastOperation(void) { uint32_t delay = 600000U; uint32_t error; while(FLASH_GET_FLAG(FLASH_FLAG_BSY)) { if(delay > 0) delay--; else return ERROR; } // 检查错误 error = (FLASH->SR & FLASH_FLAG_SR_ERRORS); if (error != 0u) { FLASH_CLEAR_FLAG(error); return ERROR; } // 检查操作完成 if(FLASH_GET_FLAG(FLASH_FLAG_EOP)) { FLASH_CLEAR_FLAG(FLASH_FLAG_EOP); } return SUCCESS; } //***************************************************************************** //功能: 写入最小单元 //说明: 8字节 //***************************************************************************** ErrorStatus FLASH_Program_DoubleWord(uint8_t Bank, uint32_t Address, uint64_t Data) { if(FLASH_WaitForLastOperation() == ERROR) return ERROR; // 选择BANK if (READ_BIT(FLASH->OPTR, FLASH_OPTR_DBANK) == 0U) { CLEAR_BIT(FLASH->CR, FLASH_CR_BKER); } else { if(Bank == FLASH_BANK2) SET_BIT(FLASH->CR, FLASH_CR_BKER); else CLEAR_BIT(FLASH->CR, FLASH_CR_BKER); } SET_BIT(FLASH->CR, FLASH_CR_PG); // 写第一个字 *(uint32_t *)Address = (uint32_t)Data; // 确保2步执行 __ISB(); // 写第二个字 *(uint32_t *)(Address + 4U) = (uint32_t)(Data >> 32U); if(FLASH_WaitForLastOperation() == ERROR) return ERROR; CLEAR_BIT(FLASH->CR, FLASH_CR_PG); return SUCCESS; } //***************************************************************************** //功能: 擦除 FLASH_CR_BKER //说明: 1页2K字节 //***************************************************************************** ErrorStatus FLASH_PageEarse(uint8_t Bank, uint32_t Page) { if(FLASH_WaitForLastOperation() == ERROR) return ERROR; // 选择BANK if (READ_BIT(FLASH->OPTR, FLASH_OPTR_DBANK) == 0U) { CLEAR_BIT(FLASH->CR, FLASH_CR_BKER); } else { if(Bank == FLASH_BANK2) SET_BIT(FLASH->CR, FLASH_CR_BKER); else CLEAR_BIT(FLASH->CR, FLASH_CR_BKER); } MODIFY_REG(FLASH->CR, FLASH_CR_PNB, ((Page & 0xFFU) << FLASH_CR_PNB_Pos)); SET_BIT(FLASH->CR, FLASH_CR_PER); SET_BIT(FLASH->CR, FLASH_CR_STRT); if(FLASH_WaitForLastOperation() == ERROR) return ERROR; CLEAR_BIT(FLASH->CR, FLASH_CR_PER); return SUCCESS; } //***************************************************************************** //功能: 读取 //说明: //***************************************************************************** void Flash_ReadBuff(uint8_t Bank, uint32_t Addr, uint8_t *Buff, uint16_t Length) { uint16_t i = 0; // 选择BANK if(Bank == FLASH_BANK2) SET_BIT(FLASH->CR, FLASH_CR_BKER); else CLEAR_BIT(FLASH->CR, FLASH_CR_BKER); for(i = 0; i < Length; i++) { Buff[i] = *(uint8_t *)(Addr + i); } } //***************************************************************************** //功能: 存储写入 //说明: 最小64位写入 //***************************************************************************** uint8_t Flash_WriteBuff(uint8_t Bank, uint32_t Addr, uint64_t *Buff, uint16_t Length) { uint16_t i = 0; uint32_t addr = Addr; Flash_ActionStart(); for(i = 0; i < Length; i++) { if(FLASH_Program_DoubleWord(Bank, addr, Buff[i]) == SUCCESS) addr += 8; else return 0; } Flash_ActionEnd(); return 1; } //***************************************************************************** //功能: 擦除 //说明: //***************************************************************************** uint8_t Flash_EraseUnits(uint8_t Bank, uint32_t UnitStart, uint8_t Units) { uint8_t i = 0; Flash_ActionStart(); for(i = 0; i < Units; i++) { if(FLASH_PageEarse(Bank, UnitStart + i) == ERROR) return 0; } Flash_ActionEnd(); return 1; }