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STM32 FLASH changes from Freddie Chopin

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5473 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2013-01-03 13:39:16 +00:00
parent 9388f4510a
commit b25e932ef5
1 changed files with 23 additions and 14 deletions
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37
arch/arm/src/stm32/stm32_flash.c
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@ -35,7 +35,7 @@
/* Provides standard flash access functions, to be used by the flash mtd driver.
* The interface is defined in the include/nuttx/progmem.h
*
*
* Requirements during write/erase operations on FLASH:
* - HSI must be ON.
* - Low Power Modes are not permitted during write/erase
@ -80,7 +80,7 @@ void stm32_flash_unlock(void)
if (getreg32(STM32_FLASH_CR) & FLASH_CR_LOCK)
{
/* Unlock sequence */
putreg32(FLASH_KEY1, STM32_FLASH_KEYR);
putreg32(FLASH_KEY2, STM32_FLASH_KEYR);
}
@ -112,6 +112,11 @@ uint16_t up_progmem_pagesize(uint16_t page)
int up_progmem_getpage(uint32_t addr)
{
if (addr >= STM32_FLASH_BASE)
{
addr -= STM32_FLASH_BASE;
}
if (addr >= STM32_FLASH_SIZE)
{
return -EFAULT;
@ -131,14 +136,14 @@ int up_progmem_erasepage(uint16_t page)
}
/* Get flash ready and begin erasing single page */
if (!(getreg32(STM32_RCC_CR) & RCC_CR_HSION))
{
return -EPERM;
}
stm32_flash_unlock();
modifyreg32(STM32_FLASH_CR, 0, FLASH_CR_PER);
putreg32(page * STM32_FLASH_PAGESIZE, STM32_FLASH_AR);
modifyreg32(STM32_FLASH_CR, 0, FLASH_CR_STRT);
@ -146,10 +151,10 @@ int up_progmem_erasepage(uint16_t page)
while(getreg32(STM32_FLASH_SR) & FLASH_SR_BSY) up_waste();
modifyreg32(STM32_FLASH_CR, FLASH_CR_PER, 0);
/* Verify */
for (addr = page * STM32_FLASH_PAGESIZE + STM32_FLASH_BASE, count = STM32_FLASH_PAGESIZE;
for (addr = page * STM32_FLASH_PAGESIZE + STM32_FLASH_BASE, count = STM32_FLASH_PAGESIZE;
count; count-=4, addr += 4)
{
if (getreg32(addr) != 0xffffffff)
@ -173,8 +178,8 @@ int up_progmem_ispageerased(uint16_t page)
}
/* Verify */
for (addr = page * STM32_FLASH_PAGESIZE + STM32_FLASH_BASE, count = STM32_FLASH_PAGESIZE;
for (addr = page * STM32_FLASH_PAGESIZE + STM32_FLASH_BASE, count = STM32_FLASH_PAGESIZE;
count; count--, addr++)
{
if (getreg8(addr) != 0xff)
@ -200,6 +205,11 @@ int up_progmem_write(uint32_t addr, const void *buf, size_t count)
/* Check for valid address range */
if (addr >= STM32_FLASH_BASE)
{
addr -= STM32_FLASH_BASE;
}
if ((addr+count) >= STM32_FLASH_SIZE)
{
return -EFAULT;
@ -213,10 +223,10 @@ int up_progmem_write(uint32_t addr, const void *buf, size_t count)
}
stm32_flash_unlock();
modifyreg32(STM32_FLASH_CR, 0, FLASH_CR_PG);
for (addr += STM32_FLASH_BASE; count; count--, hword++, addr+=2)
for (addr += STM32_FLASH_BASE; count; count-=2, hword++, addr+=2)
{
/* Write half-word and wait to complete */
@ -237,7 +247,6 @@ int up_progmem_write(uint32_t addr, const void *buf, size_t count)
modifyreg32(STM32_FLASH_CR, FLASH_CR_PG, 0);
return -EIO;
}
}
modifyreg32(STM32_FLASH_CR, FLASH_CR_PG, 0);