MSP430F5638 串口输入中断问题

guo123

MSP430F5638 串口输入中断问题 [复制链接]

我采用MSP430F5638的UCA0 与 TMS320F28335的Scic口进行通信:
MSP430F5638的程序如下:

1. #include <intrinsics.h>
   
2. #include <string.h>
   
3. #include "msp430.h"
   
4. #include "driverlib/MSP430F5xx_6xx/flash.h"
   
5. #include "driverlib/MSP430F5xx_6xx/wdt_a.h"
   
6. #include "driverlib/MSP430F5xx_6xx/ucs.h"
   
7. #include "driverlib/MSP430F5xx_6xx/pmm.h"
   
8. #include "driverlib/MSP430F5xx_6xx/sfr.h"
   
9. #include "driverlib/MSP430F5xx_6xx/inc/hw_memmap.h"
   
10. #include "IQmathLib.h"
    
11. #include "hal.h" // Modify hal.h to select your hardware
    
12. 
    
13. #include "Main_F5528_Scan.h"
    
14. 
    
15. void INIT_SciB_Char(void);
    
16. 
    
17. 
    
18. void main(void)
    
19. {
    
20. 
    
21. WDTCTL = WDTPW + WDTHOLD; // Stop Watchdog Timer
    
22. // for 24MHz MCLK, below.
    
23. PMM_setVCore(PMM_BASE, PMM_CORE_LEVEL_3);
    
24. 
    
25. initPorts(); // Config all the GPIOS for low-power (output low)
    
26. initClocks(24000000); // Config clocks.
    
27. 
    
28. P8SEL |= BIT2 + BIT3; // P3.3,4 = USCI_A0 RXD/TXD 触摸屏通信
    
29. UCA1CTL1 |= UCSWRST; // 重置UCA0
    
30. UCA1CTL1 |= UCSSEL_2; // SMCLK 6MHz
    
31. UCA1BR0 = 0x71; // 波特率9600
    
32. UCA1BR1 = 0x02; // 波特率9600
    
33. UCA1MCTL = 0x00; // No Modulation
    
34. UCA1CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
    
35. 
    
36. P2SEL |= BIT4 + BIT5; // P4.4,5 = USCI_A1 RXD/TXD F28335通信
    
37. UCA0CTL1 |= UCSWRST; // 重起UCA1
    
38. UCA0CTL1 |= UCSSEL_2; // SMCLK 6MHz
    
39. UCA0BR0 = 0x34; // 波特率1152000
    
40. UCA0BR1 = 0x00; // 波特率115200
    
41. UCA0MCTL = 0x40;
    
42. UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
    
43. 
    
44. // setup watchdog as 1 second timer 设置在看门狗模式看门狗定时器的时钟源。
    
45. // WDT_A_watchdogTimerInit(WDT_A_BASE,WDT_A_CLOCKSOURCE_SMCLK,WDT_A_CLOCKDIVIDER_512K);
    
46. // WDT_A_start(WDT_A_BASE);
    
47. 
    
48. UCA0IFG = 0x00; // 清UCA0中断标识
    
49. UCA0IE = 0x01; // 使能UCA0中断;
    
50. UCA0IE |= UCRXIE; // 使能UCA0接收中断;UCRXIE
    
51. 
    
52. UCA1IFG = 0x00; // 清UCA1中断标识
    
53. UCA1IE = 0x01; // 使能接收中断;
    
54. UCA1IE |= UCRXIE; // 使能UCA1接收中断
    
55. 
    
56. UCS_getSMCLK(UCS_BASE);
    
57. UCS_getMCLK(UCS_BASE);
    
58. UCS_getACLK(UCS_BASE);
    
59. 
    
60. __enable_interrupt(); // enable interrupts
    
61. 
    
62. TX_FuncNO = 4;
    
63. 
    
64. for(;;)
    
65. {
    
66. }
    
67. }
    
68. 
    
69. #pragma vector=USCI_A0_VECTOR
    
70. __interrupt void USCI_A0_ISR(void)
    
71. {
    
72. 
    
73. while (!(UCA0IFG&UCRXIFG)); // USCI_A0 TX buffer ready?
    
74. RSciA_Char = UCA0RXBUF;
    
75. 
    
76. UCA0IFG = 0x00;; //MSP430 清UCA1中断标识
    
77. }
    
78. //*****************************************************************************
    
79. // UART1中断服务子程序。接收触摸屏菜单指令并处理
    
80. //*****************************************************************************
    
81. 
    
82. #pragma vector=USCI_A1_VECTOR
    
83. __interrupt void USCI_A1_ISR(void)
    
84. {
    
85. 
    
86. TX_FuncNO = 4;
    
87. //取F28335 存放的样本数据
    
88. while(UCA0STAT && UCBUSY){};
    
89. UCA0TXBUF = TX_FuncNO;         //发送功能号第1个字节,
    
90. while(UCA0STAT && UCBUSY){};
    
91. UCA0TXBUF = TX_FuncNO >> 8; //发送功能号第2个字节,
    
92. 
    
93. UCA1IFG = 0x00;; //MSP430 清UCA0中断标识
    
94. }

复制代码

问题是:当TMS320F28335连续不断的发送时,MSP430F5638的UCA0会发生读入中断; 但当TMS320F28335单一发送一两个字符时读入中断就不会发生.

这是什么原因呢?怎么解决?