msp430f5529 的UART模块485通讯问题

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msp430f5529 的UART模块485通讯问题 [复制链接]

我想问下我这程序有什么问题，为什么老是出错。我是想让程序每一秒发一组数据，receive_Data才4个数据，但是i==6才能发送出5个数据“0xf0 0xf1 0xf2 0xf3 0xfe”如果i==5的话又变成“0xf0 0xf1 0xf2 0xfe”了。。。用的MAX3485连接MPU，再转成RS232到电脑上的串口调试程序。如果我想接收和发送多个数据，我应该怎么配置寄存器？发送和接收多个数据是进一次中断还是进多个（数据的字节数）中断

1. #include <msp430.h>
   
2. #include "UCA0_UART.h"
   
3. #include "TIMER_A0.h"
   
4. 
   
5. void main()
   
6. {
   
7. WDTCTL = WDTPW + WDTHOLD;
   
8. UCA0_Init();
   
9. TIMERA0_Init();
   
10. _EINT();
    
11. 
    
12. while(1);
    
13. 
    
14. }
    
15. 
    
16. #include <msp430.h>
    
17. #include "TIMER_A0.h"
    
18. #include "UCA0_UART.h"
    
19. 
    
20. 
    
21. /******************************
    
22. 名 称：TIMERA0_Init
    
23. 功 能：初始化TIMERA0寄存器操作
    
24. 参 数：无
    
25. 返 回：无
    
26. ******************************/
    
27. void TIMERA0_Init(void)
    
28. {
    
29. P8DIR |= BIT0;
    
30. TA0CCR0 = 32768-1;
    
31. TA0CTL = TASSEL_1 + MC_1 + TACLR + TAIE; // ACLK, contmode, clear TAR
    
32. // enable interrupt
    
33. }
    
34. 
    
35. #pragma vector=TIMER0_A1_VECTOR
    
36. __interrupt void TIMER0_A1_ISR(void)
    
37. {
    
38. switch(__even_in_range(TA0IV,14))
    
39. {
    
40. case 0: break; // No interrupt
    
41. case 2: break; // CCR1 not used
    
42. case 4: break; // CCR2 not used
    
43. case 6: break; // reserved
    
44. case 8: break; // reserved
    
45. case 10: break; // reserved
    
46. case 12: break; // reserved
    
47. case 14: // overflow
    
48. P8OUT ^= BIT0;
    
49. RS485_T;
    
50. UCA0IE |= UCTXIE;
    
51. break;
    
52. default: break;
    
53. }
    
54. }
    
55. 
    
56. #include <msp430.h>
    
57. #include "UCA0_UART.h"
    
58. 
    
59. unsigned char receive_Data[4] = {0x00,0x00,0x00,0x00};
    
60. unsigned char transmit_Data[4] = {0xf0,0xf1,0xf2,0xf3};
    
61. 
    
62. unsigned char i = 0;
    
63. 
    
64. /******************************
    
65. 名 称：UCA0_Init
    
66. 功 能：初始化UCA0寄存器操作，波特率9600，奇偶校验位无，数据位8位，停止位1位，
    
67. 参 数：无
    
68. 返 回：无
    
69. ******************************/
    
70. void UCA0_Init(void)
    
71. {
    
72. P3SEL = BIT3 + BIT4;
    
73. UCA0CTL1 |= UCSWRST;
    
74. UCA0CTL1 |= UCSSEL_2; // SMCLK = 1.048576MHz
    
75. UCA0BR0 = 6; // 1.048576MHz 9600 N = 1.048576/(16*9600 )= 6
    
76. UCA0BR1 = 0; // 1.048576MHz 9600
    
77. UCA0MCTL |= UCBRS_0 + UCBRF_13 + UCOS16; // Modulation UCBRSx=1, UCBRFx=0
    
78. // over sampling
    
79. UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
    
80. UCA0IE |= UCRXIE; // Enable USCI_A0 RX interrupt
    
81. 
    
82. 
    
83. RS485_OUT;
    
84. RS485_R;
    
85. 
    
86. }
    
87. 
    
88. #pragma vector=USCI_A0_VECTOR
    
89. __interrupt void USCI_A0_ISR(void)
    
90. {
    
91. switch(__even_in_range(UCA0IV,4))
    
92. {
    
93. case 0:break;
    
94. case 2:
    
95. case 4:
    
96. while(UCA0IFG&UCTXIFG);
    
97. 
    
98. TA0CTL &=~ TAIE;
    
99. UCA0IE &=~ UCRXIE;
    
100. UCA0TXBUF = transmit_Data[i++];
     
101. if(i == 4)
     
102. {
     
103. i = 0;
     
104. UCA0IFG &=~ UCTXIFG;
     
105. UCA0IE &=~ UCTXIE;
     
106. TA0CTL |= TAIE;
     
107. RS485_R;
     
108. return;
     
109. }
     
110. 
     
111. break;
     
112. default: break;
     
113. }
     
114. }

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