Mikroelektronika MIKROE-724 データシート

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mikoBasic PRO for dsPIC30/33 and PIC24

MikroElektronika

mikroBasic  PRO  for  dsPIC30/33  and  PIC24  provides  library  which  implements  Software  UART  communication. 

These routines are hardware independent and can be used with any MCU. The Software UART Library provides easy 

communication with other devices via the RS232 protocol.

Important: The Software UART library implements time-based activities, so interrupts need to be disabled when using it. 

Library Routines

 

- Soft_UART_Init 

 

- Soft_UART_Read 

 

- Soft_UART_Write 

 

- Soft_UART_Break 

Soft_UART_Init

sub function Soft_UART_Init(dim byref port as word, dim rx, tx as word, dim 

baud_rate as longword, dim inverted as word)

Description Configures and initializes the software UART module.

Software UART routines use Delay_Cyc routine. If requested baud rate is too low then calculated 

parameter for calling 

Delay_Cyc

 exceeds 

Delay_Cyc

 argument range.

If requested baud rate is too high then rounding error of 

Delay_Cyc

 argument corrupts Software 

UART timings.

Parameters - 

port

: software UART port address 

- 

rx

: receiver pin 

- 

tx

: transmiter pin 

- 

baud_rate

: requested baudrate. Maximum baud rate depends on the MCU’s clock and working 

conditions 

- 

inverted

: if set to non-zero value, indicates inverted logic on output 

- 

2

 - error, requested baud rate is too low 

- 

1

 - error, requested baud rate is too high 

- 

0

 - successful initialization 

Nothing.

This will initialize software UART and establish the communication at 9600 bps:

Soft_UART_Init(PORTB, 1, 2, 9600, 0)

The Software UART library implements time-based activities, so interrupts need to be disabled when 

using it.