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本帖最后由 Heaven_1 于 2022-3-10 13:54 编辑 ; G+ R- I; w3 z, v
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//该模拟串口为半双工模式， 2400/8/N/14 y7 B6 F7 P5 y" _3 Y: L: B
//如需不同波特率改变T2定时器的时间便可
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- S' w: o8 A/ ?" e# O+ W0 G#pragma vector = TIMER2_OVF_vect& m3 G. a0 B7 M* M M& K
__interrupt
, j, W( t# m# V% X$ dvoid T2time139us(void)
" w( b7 c7 C0 ]/ d) F{
8 j& J8 \) F3 _ static unsigned char bit;0 M% L5 v4 P& d. O3 P \
static unsigned char count;* }7 k8 U) x8 Z$ K2 g( P
static unsigned char stat_flag;' ~" x/ [7 r" W
static unsigned char tmp;- M% y4 p( J! h# N& B* x5 F
static unsigned char recv_byte;% a, R3 S4 l7 \% Y
TCNT2 = 152;
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if((Uart1_RX_overtimer != 0) && (Uart1_RX_overtimer != 0xff)){
/ b& V: M! V* E9 c/ u Uart1_RX_overtimer--;: h# z0 K3 e( L$ _" E( g5 v' U
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/ r" t/ @) I3 z4 B if( Uart1_RX_overtimer == 0 ){
, D" A! Q. S, \# h p: @ asm("sei");* Z0 h4 \% k) y) C) W- F
return;
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if(Uart1_send_haveframe == NONE)
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' D5 K+ b: _4 ]& ^" j if(Uart1_recv_haveframe != NONE) {5 ]) b4 W- G, u( }% M
asm("sei");
# z' W* b- ]5 [& \ return;
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if(stat_flag == 0xa5){
8 C' ^3 n6 g' T- u+ o stat_flag = 0;3 s# `- T; E- n: i1 G/ \9 T
bit = 1;9 Z, J7 r* X. `4 Y [
count = 0;
3 X! ]9 P/ C' n' @: ^: v3 L tmp = 0;: p8 H7 S7 E: p/ z$ u1 u7 Z0 u
recv_byte = 0;! i( z0 W! K. {: M
asm("sei");7 k$ }( _4 J9 Y) s7 \
return;
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4 z$ d; S {0 h3 u& E4 s0 o' f if(bit == 0)% r$ z7 Q2 L- \0 L7 V* Y1 r5 N
{1 _! O8 i- B8 h4 b/ [
if(!(IORxd_PIN & (1<<IORxd_BIT))){; o( G* Z F6 L, y2 Z, O& ^
count ++;
8 O7 A5 j+ `# [ H& Q. F8 | if(count >= 2) stat_flag = 0xa5;
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else{
7 D! z" P& e+ n. _. R count = 0;% h+ o% X4 ^9 ^- V. X
stat_flag = 0;
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asm("sei");
1 m C6 M3 k" w- y9 U return;
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if(bit == 9)
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if(!(IORxd_PIN & (1<<IORxd_BIT))) {: O3 h+ L0 H6 k/ E
asm("sei");6 S+ |4 I: @! d% x% ~
return;
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count++;8 v3 Q/ M# A- B
if(count >= 3 ){9 B6 ^$ Y9 l( W
bit = 0;# P! U/ l. G, V: u" K& ?
count = 0;/ [! V9 u( E, H; ^# Q" N
Uart1_recv_buf[Uart1_recv_pt++] = recv_byte;
3 j2 J# ]% R7 M& q/ @) F if(Uart1_recv_pt>=63) Uart1_recv_pt = 62;
Q* k* a" L: H; q4 _5 h Uart1_RX_overtimer = 100;$ W" M! E4 G5 R6 K6 w/ \
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asm("sei");
. ~+ b/ ?* X; @( p3 |& O1 L return;
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tmp = tmp << 1;" ?2 F+ K6 ]7 _, l( q- y) c, C
if((IORxd_PIN & (1<<IORxd_BIT))) tmp++;, Y i1 K7 v0 X
count ++;: Q% c8 A# V" y3 t8 }, e8 X9 e
if(count >= 3){
9 j ^9 C3 t( g1 [* j" O5 Q recv_byte = recv_byte >> 1;
; L+ X% L) z( [! i if( (tmp==3) || (tmp>4) ) recv_byte |= 0x80;
, y/ c. [" m1 Z$ @6 H tmp = 0;' u8 a0 y' d+ ^! C8 {- a
count = 0;
& E$ H6 \3 L1 B: Y6 o0 \! ]7 C, f0 o bit ++;
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else
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6 M. N$ r8 S J* } count++;$ X6 i; E N9 g" X# n# L
if(count >= 3)+ l! [( Y9 t! r
{
7 g& s! }* N$ n, u4 j4 F5 \ count = 0;( ?" Z# a2 t2 j: H; ]
if(bit == 0){
$ ~- Q i% _9 n& M) H6 k: G IoTxd_PORT &= ~(1<<IOTxd_BIT);# Z! z9 ^" ^3 W2 F7 ^5 N m
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else if(bit == 9)
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IOTxd_PORT |= (1<<IOTxd_BIT);
" G. F; P8 h6 b% e$ ~ Uart1_send_pt ++;
% V: t/ l3 S/ [ if(Uart1_send_pt >= Uart1_neet_send){
9 e' v. d, x3 |% ~2 a$ R Uart1_send_haveframe = NONE;8 ?0 R- [9 `+ S3 n* k0 d l& I# s) \
}
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( U" ~* F/ {2 ]3 O( b else
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+ i+ ?- [9 W. p0 ]7 g if((Uart1_send_buf[Uart1_send_pt] & (1<<(bit-1))) == 0) IOTxd_PORT &= ~(1<<IOTxd_BIT);
8 X1 i5 r3 {+ b& I! L else IOTxd_PORT |= (1<<IOTxd_BIT);; r, }: t( _6 c+ e
}
* y' _8 U1 Y5 R0 V- T if(bit >= 9) bit = 0;
5 t1 i* q& }/ P2 i: w else bit ++;; c+ l9 Y+ W7 }, h% {$ ]
}
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, l. l/ y- |8 L4 G asm("sei"); ( ]5 U& U; s7 {8 N2 S- F
}
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发表于 2022-3-10 10:14
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