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/*
* This software is experimental and a work in progress.
* Under no circumstances should these files be used in relation to any critical system(s).
* Use of these files is at your own risk.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* This files are free to use from https://github.com/rogerclarkmelbourne/Arduino_STM32 and
* https://github.com/leaflabs/libmaple
*
* Modifications for QMK and STM32F303 by Yiancar
*/
#include <hal.h>
#include "flash_stm32.h"
#if defined(EEPROM_EMU_STM32F103xB)
# define FLASH_SR_WRPERR FLASH_SR_WRPRTERR
#endif
/* Delay definition */
#define EraseTimeout ((uint32_t)0x00000FFF)
#define ProgramTimeout ((uint32_t)0x0000001F)
#define ASSERT(exp) (void)((0))
/**
* @brief Inserts a time delay.
* @param None
* @retval None
*/
static void delay(void) {
__IO uint32_t i = 0;
for (i = 0xFF; i != 0; i--) {
}
}
/**
* @brief Returns the FLASH Status.
* @param None
* @retval FLASH Status: The returned value can be: FLASH_BUSY, FLASH_ERROR_PG,
* FLASH_ERROR_WRP or FLASH_COMPLETE
*/
FLASH_Status FLASH_GetStatus(void) {
if ((FLASH->SR & FLASH_SR_BSY) == FLASH_SR_BSY) return FLASH_BUSY;
if ((FLASH->SR & FLASH_SR_PGERR) != 0) return FLASH_ERROR_PG;
if ((FLASH->SR & FLASH_SR_WRPERR) != 0) return FLASH_ERROR_WRP;
if ((FLASH->SR & FLASH_OBR_OPTERR) != 0) return FLASH_ERROR_OPT;
return FLASH_COMPLETE;
}
/**
* @brief Waits for a Flash operation to complete or a TIMEOUT to occur.
* @param Timeout: FLASH progamming Timeout
* @retval FLASH Status: The returned value can be: FLASH_ERROR_PG,
* FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT.
*/
FLASH_Status FLASH_WaitForLastOperation(uint32_t Timeout) {
FLASH_Status status;
/* Check for the Flash Status */
status = FLASH_GetStatus();
/* Wait for a Flash operation to complete or a TIMEOUT to occur */
while ((status == FLASH_BUSY) && (Timeout != 0x00)) {
delay();
status = FLASH_GetStatus();
Timeout--;
}
if (Timeout == 0) status = FLASH_TIMEOUT;
/* Return the operation status */
return status;
}
/**
* @brief Erases a specified FLASH page.
* @param Page_Address: The page address to be erased.
* @retval FLASH Status: The returned value can be: FLASH_BUSY, FLASH_ERROR_PG,
* FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT.
*/
FLASH_Status FLASH_ErasePage(uint32_t Page_Address) {
FLASH_Status status = FLASH_COMPLETE;
/* Check the parameters */
ASSERT(IS_FLASH_ADDRESS(Page_Address));
/* Wait for last operation to be completed */
status = FLASH_WaitForLastOperation(EraseTimeout);
if (status == FLASH_COMPLETE) {
/* if the previous operation is completed, proceed to erase the page */
FLASH->CR |= FLASH_CR_PER;
FLASH->AR = Page_Address;
FLASH->CR |= FLASH_CR_STRT;
/* Wait for last operation to be completed */
status = FLASH_WaitForLastOperation(EraseTimeout);
if (status != FLASH_TIMEOUT) {
/* if the erase operation is completed, disable the PER Bit */
FLASH->CR &= ~FLASH_CR_PER;
}
FLASH->SR = (FLASH_SR_EOP | FLASH_SR_PGERR | FLASH_SR_WRPERR);
}
/* Return the Erase Status */
return status;
}
/**
* @brief Programs a half word at a specified address.
* @param Address: specifies the address to be programmed.
* @param Data: specifies the data to be programmed.
* @retval FLASH Status: The returned value can be: FLASH_ERROR_PG,
* FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT.
*/
FLASH_Status FLASH_ProgramHalfWord(uint32_t Address, uint16_t Data) {
FLASH_Status status = FLASH_BAD_ADDRESS;
if (IS_FLASH_ADDRESS(Address)) {
/* Wait for last operation to be completed */
status = FLASH_WaitForLastOperation(ProgramTimeout);
if (status == FLASH_COMPLETE) {
/* if the previous operation is completed, proceed to program the new data */
FLASH->CR |= FLASH_CR_PG;
*(__IO uint16_t*)Address = Data;
/* Wait for last operation to be completed */
status = FLASH_WaitForLastOperation(ProgramTimeout);
if (status != FLASH_TIMEOUT) {
/* if the program operation is completed, disable the PG Bit */
FLASH->CR &= ~FLASH_CR_PG;
}
FLASH->SR = (FLASH_SR_EOP | FLASH_SR_PGERR | FLASH_SR_WRPERR);
}
}
return status;
}
/**
* @brief Unlocks the FLASH Program Erase Controller.
* @param None
* @retval None
*/
void FLASH_Unlock(void) {
if (FLASH->CR & FLASH_CR_LOCK) {
/* Authorize the FPEC Access */
FLASH->KEYR = FLASH_KEY1;
FLASH->KEYR = FLASH_KEY2;
}
}
/**
* @brief Locks the FLASH Program Erase Controller.
* @param None
* @retval None
*/
void FLASH_Lock(void) {
/* Set the Lock Bit to lock the FPEC and the FCR */
FLASH->CR |= FLASH_CR_LOCK;
}
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