TP4 bosio@lirmm.fr.

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Transcription de la présentation:

TP4 bosio@lirmm.fr

Flash Memory Flash memory is a non-volatile computer storage chip that can be electrically erased and reprogrammed Flash memory is non-volatile, meaning no power is needed to maintain the information stored in the chip Flash memory offers fast read access times (although not as fast as volatile DRAM memory used for main memory in PCs) and better kinetic shock resistance than hard disks Limitations: - although it can be read or programmed a byte or a word at a time in a random access fashion, it can only be erased a "block" at a time (once a bit has been set to 0, only by erasing the entire block can it be changed back to 1)

Flash Memory Flash is Memory Mapped: can be accesses trough its address Your code is written from address 0x0800 0000 Your Board has 256Kbyte of FLASH, how many blocks are available?

Flash Organization The memory organization is based on 128 pages of 2 Kbytes STM32F303xB/C and STM32F358xC devices, 256 pages of 2 Kbytes STM32F303xD/E An information block Internal Registers

How to… I want to store data in flash. How can I store data in flash memory? Unlock the Flash Clear All pending flags Erase the FLASH page Program Flash Bank1 (write) Lock the Flash Now you can read stored data...

Exercice 1 Télécharger le programme http://www.lirmm.fr/~bosio/L3/Flash.c Utiliser le debugger pour vérifier le fonctionnement du programme Option “Memory Browser” pour visualiser le contenu de la memoire FLASH

Exercice 2 Ecrire un programme pour compter le nombre de “doubleclick” sur le bouton dans un intervalle de 30 seconds. Pendant le 30 seconds, le LED4 doit rester allumé Apres 30 seconds (le LED4 s'eteign) et le programme écrit dans la flash le nombre de doubleclick. Enfin, dès qu’il y a un double-click sur le bouton, le programme va lire la valeur sauvegardée dans la flash et : Allume le LED3 si la valeur est inférieur à 5 Allume le LED7 si la valeur est supérieur ou égale à 5

Exercice 3 Ecrire un programme pour compter le nombre de “double-click” sur le bouton dans un intervalle de 30 seconds. Pendant le 30 seconds, le LED4 doit rester allumé Apres 30 seconds (le LED4 s'eteign) et le programme écrit dans la flash le nombre de doubleclick. Debrancher la carte Rebrancher la carte (sans reprogrammer la carte avec le debugger) : Le programme doit lire dans la flash la valeur sauvegardée et : Allume le LED3 si la valeur est inférieur à 5 Allume le LED7 si la valeur est supérieur ou égale à 5

Exercice 4 (optionel) Modifier l'exercice 3 pour permettre de re- initaliser le programme Pouvoir sauvegarder une nouvelle valuer de doubleclick