Memory layout on a microcontroller (Flash, SRAM, EEPROM) in Embedded C - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a variable stored in Flash memory.

Embedded C

const char message[] [1] = "Hello";

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APROGMEM

Bvolatile

Cstatic

Dregister

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'volatile' instead of 'PROGMEM' for Flash storage.

The PROGMEM keyword tells the compiler to store the variable in Flash memory.

2fill in blank

medium

Complete the code to declare a variable stored in SRAM.

Embedded C

[1] int counter = 0;

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Aregister

Bvolatile

Cconst

Dstatic

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'register' which stores variable in CPU register, not SRAM.

The static keyword declares a variable stored in SRAM with persistent value inside the function or file.

3fill in blank

hard

Fix the error in the code to correctly declare a variable in EEPROM.

Embedded C

uint8_t [1] eeprom_var;

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APROGMEM

BEEMEM

Cvolatile

Dstatic

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'PROGMEM' which stores data in Flash, not EEPROM.

The EEMEM keyword is used to place variables in EEPROM memory.

4fill in blank

hard

Fill both blanks to create a dictionary of variable types and their memory sections.

Embedded C

const char* memory_map[] = {"Flash", [1], "SRAM", [2];

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A"PROGMEM"

B"volatile"

C"static"

D"EEMEM"

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing EEPROM keyword with SRAM.

Flash memory uses PROGMEM and SRAM variables often use static for persistence.

5fill in blank

hard

Fill all three blanks to complete the code that reads a byte from EEPROM and stores it in SRAM.

Embedded C

uint8_t [2] EEMEM;
uint8_t [1] = eeprom_read_byte((uint8_t*)[3]);

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Adata_sram

Bdata_eeprom

C&data_eeprom

Ddata_flash

Attempts:

3 left

💡 Hint

Common Mistakes

Passing variable instead of address to eeprom_read_byte.

data_sram stores the byte in SRAM, data_eeprom is the EEPROM variable, and &data_eeprom is the address passed to eeprom_read_byte.