//----------------------I2C5----------------------
/*---------------------PIN CONFIGURATION-----------------*/
// 1. Enable the I2C CLOCK and GPIO CLOCK --I2C5 ---PA---- SDA-12, SCL -11
RCC->MC_AHB4ENSETR |= (1<<0); //Enable clock of portA
RCC->MC_APB1ENSETR |= (1<<24); //Enable clock for i2c 5
// 2. Configure the I2C PINs for ALternate Functions
// a) Select Alternate Function in MODER Register
GPIOA->MODER |= (1<<23); //PA11-----10
GPIOA->MODER &= ~(1<<22);
GPIOA->MODER |= (1<<25); //PA12-----10
GPIOA->MODER &= ~(1<<24);
// b) Select Open Drain Output
GPIOA->OTYPER |= (1<<11);
GPIOA->OTYPER |= (1<<12);
// C) select VERY High SPEED for the PINs
GPIOA->OSPEEDR |= (1<<23); //PA11-----11
GPIOA->OSPEEDR |= (1<<22);
GPIOA->OSPEEDR |= (1<<25); //PA12-----1
GPIOA->OSPEEDR |= (1<<24);
// D)Select Pull-up for both the Pins
GPIOA->PUPDR |= (1<<22); //PA11-----01
GPIOA->PUPDR &= ~(1<<23);
GPIOA->PUPDR |= (1<<24); //PA12-----01
GPIOA->PUPDR &= ~(1<<25);
// e) Configure the Alternate Function in AFR Register
GPIOA->AFR[1] = 0x00; //HIGH SIDE ALL PIN SET TO 0
GPIOA->AFR[1] |= (1<<14); // 0100 - ARFH11
GPIOA->AFR[1] |= (1<<18); //0100 - ARFH12
/*-----------------I2C Setting CONFIGURATION----------------------*/
// 3. Reset the I2C
//I2C Control Register 1 (I2C_CR1) - use to set and reset i2c
//A software reset can be performed by clearing the PE bit in the I2C_CR1 register.
I2C5->CR1 &= ~(1<<0); //PE - AT 0BIT USE TO SOFT. SET RESET 0FOR RESET
I2C5->CR1 |= (1<<0);
I2C5->CR1 &= ~(1<<0);
// 4. Program the peripheral input clock in I2C_CR2 Register in order to generate correct timings (I2C timing register)
I2C5->TIMINGR |= (30<<0);
I2C5->TIMINGR |= (21<<8);
I2C5->TIMINGR |= (1<<20);
I2C5->TIMINGR |= (12<<28);
// I2C control register 2 ---- Automatic end mode (master mode) to 1
I2C5->CR2 |= (1<<25);
// Enable I2C -- at PE CR1
Function to send slave address code:
void Matser_send_slave_Add_transmit(void)
{
I2C5->CR2 &= ~(1<<11); //register 11 - ADD10 ---- select salve address 7bit/ 10 bit
I2C5->CR2 |= (2<<0); //Slave address enter at SADD /* here slave address as 2 */
I2C5->CR2 &= ~(1<<10); //RD_WRN---- Register use to select master - transmit or receive mode
I2C5->CR2 |= (11<<16);
//AFTER ALL THE CHANGES START BIT IS TO BE SET
I2C5->CR2 |= (1<<13); //Start Bit
while(!((I2C5->CR2)&(1<<15)));
}
Regards.
I2C5->CR1 |= (1<<0);
