[問題] 8051 RS232傳送有問題
我用8051測試送收1byte的資料，但資料的高位元組卻一直錯誤
我在8051設定一組十六進位數值0x00,透過rs232傳送到監看軟體，
結果卻秀出十六進制0x80，正確應為0x00，而設定0x80就可以正常顯示
從監看軟體送到8051的P0倒是很正常
發現低位元都對，但高位元卻一直錯誤，
有試過DEBUG模式，看到送出的資料是正確的，但電腦接收總是有問題
請問問題出在那裡，謝謝您的幫忙~
附上程式及測試結果
程式
#include <reg52.h>
unsigned char c;
/*-----------------------------*/
init_rs232()
{
SCON = 0x50;
TMOD = 0x20;
TH1 = 0xfd; //鲍率=9600
TR1 = 1;
TI = 1;
IE = 0x90;
}
/*-----------------------------*/
tx_char(unsigned char c)
{
while(1)if(TI)break;
SBUF = c;
TI=0;
}
/*-----------------------------*/
char rx_char()
{
while(1)if(RI)break;
RI=0;
return SBUF;
}
/*-----------------------------*/
main()
{
init_rs232();
while(1)
{
c=0;
c=rx_char();
tx_char(c);
}
}
結果
0x00 → 0x80
0x10 → 0x90
0x20 → 0xa0
0x30 → 0xb0
0x40 → 0xc0
0x50 → 0xd0
0x60 → 0xe0
0x70 → 0xf0
0x80 → 0x80
0x90 → 0x90
0xa0 → 0xa0
0xb0 → 0xb0
0xc0 → 0xc0
0xd0 → 0xd0
0xe0 → 0xe0
0xf0 → 0xf0
--
夏天到了~
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