ST STM32L0x3

RM0367 Rev 7 1015/1043
RM0367 Code examples
1020
A.16.9 I2C configured in slave mode to receive 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, receive DMA enable */
/* (3) 7-bit address = 0x5A */
/* (4) Enable own address 1 */
I2C1->TIMINGR = (uint32_t)0x00300619; /* (1) */
I2C1->CR1 = I2C_CR1_PE | I2C_CR1_RXDMAEN | I2C_CR1_ADDRIE; /* (2) */
I2C1->OAR1 |= (uint32_t)(I2C1_OWN_ADDRESS << 1); /* (3) */
I2C1->OAR1 |= I2C_OAR1_OA1EN; /* (4) */
A.17 USART code example
A.17.1 USART transmitter configuration code example
/* (1) oversampling by 16, 9600 baud */
/* (2) 8 data bit, 1 start bit, 1 stop bit, no parity */
USART1->BRR = 160000 / 96; /* (1) */
USART1->CR1 = USART_CR1_TE | USART_CR1_UE; /* (2) */
A.17.2 USART transmit byte code example
/* start USART transmission */
USART1->TDR = stringtosend[send++]; /* Will inititiate TC if TXE */
A.17.3 USART transfer complete code example
if((USART1->ISR & USART_ISR_TC) == USART_ISR_TC)
{
if(send == sizeof(stringtosend))
{
send=0;
USART1->ICR = USART_ICR_TCCF; /* Clear transfer complete flag */
}
else
{
/* clear transfer complete flag and fill TDR with a new char */
USART1->TDR = stringtosend[send++];
}
}
A.17.4 USART receiver configuration code example
/* (1) oversampling by 16, 9600 baud */
/* (2) 8 data bit, 1 start bit, 1 stop bit, no parity, reception mode */