Mikroelektronika MIKROE-742 데이터 시트

480

- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6

function UARTx_Read(): byte;

Received byte.

The function receives a byte via UART. Use the Uart_Data_Ready function to
test if data is ready first.

MCU with the UART module.

The UART module must be initialized before using this routine. See UARTx_Init
routine.

var receive: byte;
...

// read data if ready
if (UART1_Data_Ready() = 1) then

receive := UART1_Read();

procedure UARTx_Read_Text(var Output : string[255]; var Delimiter
: 

sting[10]; Attempts : byte);

Nothing.

Reads characters received via UART until the delimiter sequence is detected.
The read sequence is stored in the parameter output; delimiter sequence is
stored in the parameter 

delimiter.

This is a blocking call: the delimiter sequence is expected, otherwise the proce-
dure exits( if the delimiter is not found). Parameter Attempts defines number of
received characters in which Delimiter sequence is expected. If Attempts is set
to 255, this routine will continuously try to detect the Delimiter sequence.

UART HW module must be initialized and communication established before
using this function. See UARTx_Init.

Read text until the sequence “OK” is received, and send back what’s been received:

UART1_Init(4800);                     // initialize UART module

Delay_ms(100);

while TRUE do

if (UART1_Data_Ready() = 1)        // if data is received 

UART1_Read_Text(output, 'delim', 10); // reads text

until 'delim' is found

UART1_Write_Text(output);          // sends back text