ST STM32L0x3

RM0367 Rev 7 1019/1043
RM0367 Code examples
1020
A.18 LPUART code example
A.18.1 LPUART receiver configuration code example
/* (1) oversampling by 16, 9600 baud */
/* (2) Enable STOP mode, 8 data bit, 1 start bit, 1 stop bit, no parity,
reception mode */
LPUART1->BRR = 0x369; /* (1) */
LPUART1->CR1 = USART_CR1_UESM | USART_CR1_RXNEIE | USART_CR1_RE |
USART_CR1_UE; /* (2) */
A.18.2 LPUART receive byte code example
if((LPUART1->ISR & USART_ISR_RXNE) == USART_ISR_RXNE)
{
chartoreceive = (uint8_t)(LPUART1->RDR); /* Receive data, clear flag */
}
A.19 SPI code example
A.19.1 SPI master configuration code example
/* (1) Master selection, BR: Fpclk/256,
CPOL and CPHA at zero (rising first edge) */
/* (2) Slave select output enabled, RXNE IT, 8-bit Rx fifo */
/* (3) Enable SPI1 */
SPI1->CR1 = SPI_CR1_MSTR | SPI_CR1_BR; /* (1) */
SPI1->CR2 = SPI_CR2_SSOE | SPI_CR2_RXNEIE; /* (2) */
SPI1->CR1 |= SPI_CR1_SPE; /* (3) */
A.19.2 SPI slave configuration code example
/* nSS hard, slave, CPOL and CPHA at zero (rising first edge) */
/* (1) RXNE IT, 8-bit Rx fifo */
/* (2) Enable SPI2 */
SPI2->CR2 = SPI_CR2_RXNEIE; /* (1) */
SPI2->CR1 |= SPI_CR1_SPE; /* (2) */
A.19.3 SPI full duplex communication code example
if((SPI1->SR & SPI_SR_TXE) == SPI_SR_TXE) /* Test Tx empty */
{
/* Will inititiate 8-bit transmission if TXE */
*(uint8_t *)&(SPI1->DR) = SPI1_DATA;
}