ST STM32L0x3 - Page 1016

Code examples RM0367
1016/1043 RM0367 Rev 7
USART1->BRR = 160000 / 96; /* (1) */
USART1->CR1 = USART_CR1_RXNEIE | USART_CR1_RE | USART_CR1_UE; /* (2) */
A.17.5 USART receive byte code example
if((USART1->ISR & USART_ISR_RXNE) == USART_ISR_RXNE)
{
chartoreceive = (uint8_t)(USART1->RDR); /* Receive data, clear flag */
}
A.17.6 USART LIN mode code example
/* (1) oversampling by 16, 9600 baud */
/* (2) LIN mode */
/* (3) 8 data bit, 1 start bit, 1 stop bit, no parity, reception and
transmission enabled */
USART1->BRR = 160000 / 96; /* (1) */
USART1->CR2 = USART_CR2_LINEN | USART_CR2_LBDIE; /* (2) */
USART1->CR1 = USART_CR1_TE | USART_CR1_RXNEIE | USART_CR1_RE |
USART_CR1_UE; /* (3) */
while((USART1->ISR & USART_ISR_TC) != USART_ISR_TC)/* polling idle frame
Transmission */
{
/* add time out here for a robust application */
}
USART1->ICR = USART_ICR_TCCF;/* Clear TC flag */
USART1->CR1 |= USART_CR1_TCIE;/* Enable TC interrupt */
A.17.7 USART synchronous mode code example
/* (1) oversampling by 16, 9600 baud */
/* (2) Synchronous mode */
/* CPOL and CPHA = 0 => rising first edge */
/* Last bit clock pulse */
/* Most significant bit first in transmit/receive */
/* (3) 8 data bit, 1 start bit, 1 stop bit, no parity */
/* Transmission enabled, reception enabled */
USART1->BRR = 160000 / 96; /* (1) */
USART1->CR2 = USART_CR2_MSBFIRST | USART_CR2_CLKEN | USART_CR2_LBCL; /* (2)
*/
USART1->CR1 = USART_CR1_TE | USART_CR1_RXNEIE | USART_CR1_RE |
USART_CR1_UE; /* (3) */
/* polling idle frame Transmission w/o clock */
while((USART1->ISR & USART_ISR_TC) != USART_ISR_TC)
{
/* add time out here for a robust application */
}
USART1->ICR = USART_ICR_TCCF;/* clear TC flag */