Code examples RM0367
1014/1043 RM0367 Rev 7
I2C2->TIMINGR = (uint32_t)0x00300619; /* (1) */
I2C2->CR1 = I2C_CR1_PE | I2C_CR1_RXIE; /* (2) */
I2C2->CR2 = I2C_CR2_AUTOEND | (1<<16) | I2C_CR2_RD_WRN |
(I2C1_OWN_ADDRESS<<1); /* (3) */
A.16.5 I2C configured in master mode to transmit 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 */
/* (3) Slave address = 0x5A, write transfer, 1 byte to transmit, autoend */
I2C2->TIMINGR = (uint32_t)0x00300619; /* (1) */
I2C2->CR1 = I2C_CR1_PE; /* (2) */
I2C2->CR2 = I2C_CR2_AUTOEND | (1<<16) | (I2C1_OWN_ADDRESS<<1); /* (3) */
A.16.6 I2C master transmitter code example
/* Check Tx empty */
if((I2C2->ISR & I2C_ISR_TXE) == (I2C_ISR_TXE))
{
I2C2->TXDR = I2C_BYTE_TO_SEND; /* Byte to send */
I2C2->CR2 |= I2C_CR2_START; /* Go */
}
A.16.7 I2C master receiver code example
if((I2C2->ISR & I2C_ISR_RXNE) == I2C_ISR_RXNE)
{
/* Read receive register, will clear RXNE flag */
if(I2C2->RXDR == I2C_BYTE_TO_SEND)
{
/* Process */
}
}
A.16.8 I2C configured in master mode to transmit with DMA 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 */
/* (3) Slave address = 0x5A, write transfer, 2 bytes to transmit, autoend */
I2C2->TIMINGR = (uint32_t)0x00300619; /* (1) */
I2C2->CR1 = I2C_CR1_PE | I2C_CR1_TXDMAEN; /* (2) */
I2C2->CR2 = I2C_CR2_AUTOEND | (SIZE_OF_DATA << 16) |
(I2C1_OWN_ADDRESS<<1); /* (3) */
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