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How to read an address of flash memory?
For example in order to read the contents of the 0xA010 address of the flash there is the following code: This is working fine. My question here is, since Read_Ptr is uint8, how is it storing the value 0xA010, which is a short value (16-bit Address)? How the read and write functions will occur in this memory, when the pointer is uint8?
Which is the specific address of a pointer?
Memory addresses are 32-bits long on most CPUs today, although there is a increasing trend toward 64-bit addressing). The location of i has a specific address, in this case 248,440. The pointer p holds that address once you say p = &i. The variables *p and i are therefore equivalent.
How many bytes of memory does a pointer consume?
The variable i consumes 4 bytes of memory. The pointer p also consumes 4 bytes (on most machines in use today, a pointer consumes 4 bytes of memory. Memory addresses are 32-bits long on most CPUs today, although there is a increasing trend toward 64-bit addressing). The location of i has a specific address, in this case 248,440.
How are memory addresses used in C programming?
The Basics of C Programming. In this array, every memory location has its own address — the address of the first byte is 0, followed by 1, 2, 3, and so on. Memory addresses act just like the indexes of a normal array. The computer can access any address in memory at any time (hence the name “random access memory”).
How is flash memory used in a C program?
This article talks about specifics of the C language implementation using GCC with the ARM Cortex-M architecture. Other implementations differ on specifics, but the basic concepts are the same. Code and read-only data are stored in flash memory. The layout of a C program’s flash memory is shown in the diagram above.
Where is the read only variable stored in Flash?
In the above code, read_only_variable is stored in the read-only data section as denoted by the const keyword. The compiler assigns read_only_variable a specific address location (in flash) and writes the value of 2000 to that memory location.
How to get the memory address of a microcontroller?
So a (uint8*) will give you uint8 data from the address you specified. value =0x0021 because it’s loading in address 0x0000, but its reading back uint16 data which would be the contents of 0x0000 and 0x0001 It’s assumed that value is declared large enough to hold the size of the read data.