16. Synchronous

16.1. Function description:

This demo show USARTn (Synchronous mode) with SPI0 transmitter. Connect SPI to USARTn through IO Connection information. First USART_TX sends data and spi_Rx receives data, which is stored in rxbuffer2 and SPI for the second USART_TX send data.write one byte in the SPI1 transmit data register,send a dummy byte to generate clock to slave,wait until end of transmit.wait the byte is entirely received by USARTn ,store the received byte in the rxbuffer1.

16.2. Test result:

This dmo show USARTn_TX send data,SPI_RX receive data,and SPI_TX send data,USARTn_RX receive data,if USARTn_TX send data equals SPI_RX receive data,or SPI_TX send data equals USARTn_RX receive data.print “pass”,if not, print “fail”.

16.3. IO connection:

PAD	PAD
pad_USARTn_CK	pad_SPI1_SCK
pad_USARTn_RX	pad_SPI1_MISO
pad_USARTn_TX	pad_SPI1_MOSI

Note

The ‘m’ and ‘n’ in “usartm” and “usartn” indicate the peripheral number.