Write 1 on Pin 16 in ODR Register using 5 ways

-

 Write 1 on Pin 16 in ODR Register  using 5 ways

1. Using numeric memory Address directly

#define GPIO_ODR_ADDRESS 0X00010004

Void main()
{
 *(volatile uint32_t*) GPIO_ODR_ADDRESS |= 1<16;
}

2. Casting an address to a pointer

#define GPIO_ODR ((volatile uint32_t*)GPIO_ODR_ADDRESS)

Void main()
{
 *GPIO_ODR |= 1<16;
}

3. Casting to a pointer and then dereferencing it

#define GPIO_ODR *((volatile uint32_t*)GPIO_ODR_ADDRESS)

Void main()
{
  GPIO_ODR |= 1<16;
}

4. Use structure union and pointer for one register

#define GPIO_ODR *((volatile uint32_t*)GPIO_ODR_ADDRESS)

#pragma pack(1)

struct SGPIO_ODR_t
{
    uint32_t pin0:1;
    uint32_t pin1:1;
    uint32_t pin2:1;
    uint32_t pin3:1;
    uint32_t pin4:1;
    ...
    ...
    ...
}

union U_ODR 
{
    struct SGPIO_ODR_t S_ODR;
    uint32_t ODR;
}

volatile union U_ODR *GPIO_ODR_R = (union volatile *)GPIO_ODR;

void main()
{
    GPIO_ODR_R -> S_ODR.pin16 = 1;
}

5. Use structure and Pointer for all registers in a GPIO peripheral 

#define GPIO_ADDRESS 0X00010004

#pragma pack(1)
struct SGPIO
{
    volatile uint32_t ODR;
    volatile uint32_t MODER;
    volatile uint32_t ASCR;
    volatile uint32_t IDR;
};

#define GPIOB ((struct SGPIO*)GPIO_ADDRESS)

void main()
{
    GPIOB -> ODR = 1<< 16;
}


Comments

Post a Comment

Popular posts from this blog

Cryptography and Encryption Basics - I

-
Image
Cryptography and Encryption Basics I What is encryption Encryption is the process of encoding a message or information in such a way that only authorized parties can access it and those who are not authorized can't.  Converts information from plain text into encrypted ciphertext. But how...? Encryption used algorithm! An algorithm is a procedure that the encryption process follows. The specific algorithm is called the ciper or code. there are many types so encryption algorithms. The encryption's goal and level of security determine the most effective solution. Triple DES, RSA and Blowfish are some examples of encryption algorithms or Ciphers. What is Decryption? Decryption is the process of taking encoded or encrypted text or other data and converting it back into text that you or the computer can read and understand.  converts information from encrypted ciphertext into plain text  Basic Example  Private key vs Public Key Private Key (symmetric key): This means that ...
Read more

Overview of ISO/SAE 21434 Standard

-
Image
ISO/SAE 21434, jointly published by the International Standardization Organization (ISO) and the Society of Automotive Engineers (SAE), serves as a comprehensive cybersecurity framework for electronic systems within road vehicles. Developed to bolster cybersecurity across the entire lifecycle of automotive products, this standard outlines essential vocabulary, objectives, requirements, and guidelines. Purpose and Scope: The primary objective of ISO/SAE 21434 is to enhance cybersecurity measures for vehicles throughout their lifecycle. By providing a standardized framework, this standard facilitates the establishment of cybersecurity policies, risk management practices, and a cybersecurity-oriented culture within organizations operating in the automotive industry. Three Pillars: ISO/SAE 21434 is structured around three main pillars: Cyber Security Governance:   Establishing policies, processes, and cultural norms to govern cybersecurity activities within organizations. Risk Man...
Read more

UDS Protocol Interview Question

-
UDS Protocol Interview Question  Functional Group in UDS Diagnostic and communicatio management Data Transmission Stored Data Transmission Input/Output Control Remote Activation of Rountine Upload / Download Total (27 )services untill 2020,As Per ISO 14229 2020 there are (28) services. Why it is called UDS Unified       - Term 'Unified' in this context mens  that it is an international and not a Company- Specific Standard Diagnostic - Finding Root cause Service       - checking with existing content What are the types of request in UDS Valid request  Invalid request What are types for Responce in UDS. Positive responce Negative Responce What are type of NRC ISO Specific (0x12,0x13,0x22) ISO Reserved or Manufacture Specific (0x32,0x84 etc) What are the commonly used NRC 0x12 0x13 0x22 0x24 0x33 In Default which session will be active UDS supports different Operating session, which can be changed using the "Diagnostic Session control". Dependi...
Read more