ST STM32L0x3 User Manual

RM0367 Rev 7 1013/1043
RM0367 Code examples
1020
I2C1->TIMINGR = (uint32_t)0x00300619; /* (1) */
I2C1->CR1 = I2C_CR1_PE | I2C_CR1_ADDRIE; /* (2) */
I2C1->OAR1 |= (uint32_t)(I2C1_OWN_ADDRESS << 1); /* (3) */
I2C1->OAR1 |= I2C_OAR1_OA1EN; /* (4) */
A.16.2 I2C slave transmitter code example
uint32_t I2C_InterruptStatus = I2C1->ISR; /* Get interrupt status */
/* Check address match */
if((I2C_InterruptStatus & I2C_ISR_ADDR) == I2C_ISR_ADDR)
{
I2C1->ICR |= I2C_ICR_ADDRCF; /* Clear address match flag */
/* Check if transfer direction is read (slave transmitter) */
if((I2C1->ISR & I2C_ISR_DIR) == I2C_ISR_DIR)
{
I2C1->CR1 |= I2C_CR1_TXIE; /* Set transmit IT */
}
}
else if((I2C_InterruptStatus & I2C_ISR_TXIS) == I2C_ISR_TXIS)
{
I2C1->CR1 &=~ I2C_CR1_TXIE; /* Disable transmit IT */
I2C1->TXDR = I2C_BYTE_TO_SEND; /* Byte to send */
}
A.16.3 I2C slave receiver code example
uint32_t I2C_InterruptStatus = I2C1->ISR; /* Get interrupt status */
if((I2C_InterruptStatus & I2C_ISR_ADDR) == I2C_ISR_ADDR)
{
I2C1->ICR |= I2C_ICR_ADDRCF; /* Address match event */
}
else if((I2C_InterruptStatus & I2C_ISR_RXNE) == I2C_ISR_RXNE)
{
/* Read receive register, will clear RXNE flag */
if(I2C1->RXDR == I2C_BYTE_TO_SEND)
{
/* Process */
}
}
A.16.4 I2C configured in master mode to receive code example
/* (1) Timing register value is computed with the AN4235 xls file,
fast Mode @400kHz with I2CCLK = 16MHz, rise time = 100ns, fall time =
10ns */
/* (2) Periph enable, receive interrupt enable */
/* (3) Slave address = 0x5A, read transfer, 1 byte to receive, autoend */

ST STM32L0x3 Specifications

General

Brand	ST
Model	STM32L0x3
Category	Microcontrollers
Language	English