89 lines
1.4 KiB
C
89 lines
1.4 KiB
C
/*
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* flash.c
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*
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* Created on: Apr 12, 2024
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* Author: Francesco Gritti
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*/
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#include "flash.h"
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#include "ftypes.h"
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void flash_unlock (void) {
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if ((FLASH->CR & FLASH_CR_LOCK) != 0) {
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FLASH->KEYR = FLASH_KEY1;
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FLASH->KEYR = FLASH_KEY2;
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}
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}
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void flash_lock (void) {
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FLASH->CR |= FLASH_CR_LOCK;
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}
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void flash_erase_page (u32 page) {
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// make sure no operation is ongoing
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flash_wait_last_op();
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FLASH->CR |= FLASH_CR_PER;
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FLASH->AR = page;
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FLASH->CR |= FLASH_CR_STRT;
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flash_wait_last_op ();
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FLASH->CR &= ~FLASH_CR_PER;
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}
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// write data in LITTLE ENDIAN format
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u8 flash_program_word (u32 address, u32 data) {
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flash_program_hword (address, (u16)data);
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flash_program_hword (address +2, (u16)(data>>16));
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u32 read_data = *(volatile u32*) (address);
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return (read_data == data);
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}
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u8 flash_program_hword (u32 address, u16 data) {
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flash_wait_last_op ();
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FLASH->CR |= FLASH_CR_PG;
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// write the byte into FLASH as if it was with a normal memory address
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*(volatile u16*) (address) = data;
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flash_wait_last_op ();
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FLASH->CR &= ~FLASH_CR_PG;
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u16 read_data = *(volatile u16*) (address);
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return (read_data == data);
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}
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void flash_wait_last_op () {
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// wait for operation to complete
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while((FLASH->SR & FLASH_SR_BSY) != 0);
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// clear end of operation flag if it was set
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if ((FLASH->SR & FLASH_SR_EOP) != 0)
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FLASH->SR |= FLASH_SR_EOP;
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}
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