161 lines
4.2 KiB
C
161 lines
4.2 KiB
C
//#include "libmaple.h"
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#include "libmaple/util.h"
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#include "libmaple/flash.h"
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#include "flash_stm32.h"
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#define FLASH_KEY1 ((uint32)0x45670123)
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#define FLASH_KEY2 ((uint32)0xCDEF89AB)
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/* Delay definition */
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#define EraseTimeout ((uint32)0x00000FFF)
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#define ProgramTimeout ((uint32)0x0000001F)
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/**
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* @brief Inserts a time delay.
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* @param None
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* @retval None
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*/
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static void delay(void)
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{
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__IO uint32 i = 0;
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for(i = 0xFF; i != 0; i--) { }
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}
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/**
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* @brief Returns the FLASH Status.
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* @param None
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* @retval FLASH Status: The returned value can be: FLASH_BUSY, FLASH_ERROR_PG,
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* FLASH_ERROR_WRP or FLASH_COMPLETE
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*/
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FLASH_Status FLASH_GetStatus(void)
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{
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if ((FLASH_BASE->SR & FLASH_SR_BSY) == FLASH_SR_BSY)
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return FLASH_BUSY;
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if ((FLASH_BASE->SR & FLASH_SR_PGERR) != 0)
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return FLASH_ERROR_PG;
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if ((FLASH_BASE->SR & FLASH_SR_WRPRTERR) != 0 )
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return FLASH_ERROR_WRP;
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if ((FLASH_BASE->SR & FLASH_OBR_OPTERR) != 0 )
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return FLASH_ERROR_OPT;
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return FLASH_COMPLETE;
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}
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/**
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* @brief Waits for a Flash operation to complete or a TIMEOUT to occur.
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* @param Timeout: FLASH progamming Timeout
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* @retval FLASH Status: The returned value can be: FLASH_ERROR_PG,
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* FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT.
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*/
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FLASH_Status FLASH_WaitForLastOperation(uint32 Timeout)
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{
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FLASH_Status status;
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/* Check for the Flash Status */
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status = FLASH_GetStatus();
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/* Wait for a Flash operation to complete or a TIMEOUT to occur */
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while ((status == FLASH_BUSY) && (Timeout != 0x00))
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{
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delay();
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status = FLASH_GetStatus();
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Timeout--;
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}
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if (Timeout == 0)
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status = FLASH_TIMEOUT;
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/* Return the operation status */
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return status;
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}
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/**
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* @brief Erases a specified FLASH page.
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* @param Page_Address: The page address to be erased.
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* @retval FLASH Status: The returned value can be: FLASH_BUSY, FLASH_ERROR_PG,
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* FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT.
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*/
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FLASH_Status FLASH_ErasePage(uint32 Page_Address)
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{
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FLASH_Status status = FLASH_COMPLETE;
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/* Check the parameters */
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ASSERT(IS_FLASH_ADDRESS(Page_Address));
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/* Wait for last operation to be completed */
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status = FLASH_WaitForLastOperation(EraseTimeout);
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if(status == FLASH_COMPLETE)
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{
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/* if the previous operation is completed, proceed to erase the page */
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FLASH_BASE->CR |= FLASH_CR_PER;
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FLASH_BASE->AR = Page_Address;
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FLASH_BASE->CR |= FLASH_CR_STRT;
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/* Wait for last operation to be completed */
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status = FLASH_WaitForLastOperation(EraseTimeout);
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if(status != FLASH_TIMEOUT)
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{
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/* if the erase operation is completed, disable the PER Bit */
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FLASH_BASE->CR &= ~FLASH_CR_PER;
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}
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FLASH_BASE->SR = (FLASH_SR_EOP | FLASH_SR_PGERR | FLASH_SR_WRPRTERR);
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}
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/* Return the Erase Status */
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return status;
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}
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/**
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* @brief Programs a half word at a specified address.
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* @param Address: specifies the address to be programmed.
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* @param Data: specifies the data to be programmed.
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* @retval FLASH Status: The returned value can be: FLASH_ERROR_PG,
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* FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT.
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*/
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FLASH_Status FLASH_ProgramHalfWord(uint32 Address, uint16 Data)
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{
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FLASH_Status status = FLASH_BAD_ADDRESS;
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if (IS_FLASH_ADDRESS(Address))
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{
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/* Wait for last operation to be completed */
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status = FLASH_WaitForLastOperation(ProgramTimeout);
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if(status == FLASH_COMPLETE)
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{
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/* if the previous operation is completed, proceed to program the new data */
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FLASH_BASE->CR |= FLASH_CR_PG;
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*(__IO uint16*)Address = Data;
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/* Wait for last operation to be completed */
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status = FLASH_WaitForLastOperation(ProgramTimeout);
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if(status != FLASH_TIMEOUT)
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{
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/* if the program operation is completed, disable the PG Bit */
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FLASH_BASE->CR &= ~FLASH_CR_PG;
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}
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FLASH_BASE->SR = (FLASH_SR_EOP | FLASH_SR_PGERR | FLASH_SR_WRPRTERR);
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}
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}
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return status;
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}
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/**
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* @brief Unlocks the FLASH Program Erase Controller.
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* @param None
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* @retval None
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*/
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void FLASH_Unlock(void)
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{
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/* Authorize the FPEC Access */
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FLASH_BASE->KEYR = FLASH_KEY1;
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FLASH_BASE->KEYR = FLASH_KEY2;
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}
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/**
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* @brief Locks the FLASH Program Erase Controller.
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* @param None
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* @retval None
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*/
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void FLASH_Lock(void)
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{
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/* Set the Lock Bit to lock the FPEC and the FCR */
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FLASH_BASE->CR |= FLASH_CR_LOCK;
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}
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