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SW_UART 在APP001實驗板的疑問
#1
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請問使用APP001,PIC型號18F452
在使用SW_UART是否可以正常工作?
由於目前我自己測試的結果,(portb 4[TX] )完全沒有訊號,所以想請問有那些地方我沒有注意到?
以下是程式碼::

#include <p18f452.h>
#include <p18cxxx.h>
#include <sw_uart.h>

#define Nop() {_asm nop _endasm}
int i;
void DelayRXHalfBitUART(void)
{ for(i=0;i<58;i++) Nop();}
void DelayRXBitUART(void)
{ for(i=0;i<26;i++) Nop();}
void DelayTXBitUART(void)
{ for(i=0;i<56;i++) Nop();}

void main( void )
{
char data2='a';
// configure software UART
OpenUART();
while( 1 )
{
WriteUART(data2);
}
}

以下是我使用的Delay延遲的設定公式以及數值
/*
osc = 16M Hz ; Baud = 57600

DelayTXBitUART Delay for:
((((2*FOSC) / (4*baud)) + 1) / 2) - 12 cycles
==>((((2*16M)/(4*57600))+1)/2)-12 = 58

DelayRXHalfBitUART Delay for:
((((2*FOSC) / (8*baud)) + 1) / 2) - 9 cycles
==>((((2*16M)/(8*57600))+1)/2)-9 = 26

DelayRXBitUART Delay for:
((((2*FOSC) / (4*baud)) + 1) / 2) - 14 cycles
==>((((2*16M)/(4*57600))+1)/2)-14 = 56
*/


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