STM32F10x 学习笔记7（USART实现串口通讯 3）

1. if(pbuf->RingBufRxInPtr==&pbuf->if(pbuf->RingBufRxInPtr==&pbuf->RingBufRx[COMM_RX_BUF_SIZE])
2. {/*WrapINpointer*/
3. pbuf->RingBufRxInPtr=&pbuf->RingBufRx[0];
4. }
5. OSSemPost(pbuf->RingBufRxSem);/*Indicatethatcharacterwasreceived*/
6. }
7. }
8. //ThisfunctioniscalledbytheRxISRtoinsertacharacterintothereceiveringbuffer.
11. voidUSART1_IRQHandler(void)
12. {
13. unsignedintdata;
14. unsignedcharerr;
15. OS_CPU_SRcpu_sr;
17. OS_ENTER_CRITICAL();/*TelluC/OS-IIthatwearestartinganISR*/
18. OSIntNesting++;
19. OS_EXIT_CRITICAL();
21. if(USART1->SR&0x0F)
22. {
23. //Seeifwehavesomekindoferror
24. //Clearinterrupt(donothingaboutit!)
25. data=USART1->DR;
26. }
27. elseif(USART1->SR&USART_FLAG_RXNE)//ReceiveDataRegFullFlag
28. {
29. data=USART1->DR;
30. COMPutRxChar(COM1,data);//Insertreceivedcharacterintobuffer
31. }
32. elseif(USART1->SR&USART_FLAG_TXE)
33. {
34. data=COMGetTxChar(COM1,&err);//Getnextcharactertosend.
35. if(err==COMM_TX_EMPTY)
36. {//Dowehaveanymorecharacterstosend?
37. //No,DisableTxinterrupts
38. //USART_ITConfig(USART1,USART_IT_TXE|USART_IT_TC,DISABLE);
39. USART1->CR1&=~USART_FLAG_TXE|USART_FLAG_TC;
40. }
41. else
42. {
43. USART1->DR=data;//Yes,Sendcharacter
44. }
45. }
46. OSIntExit();
47. }
49. voidUSART2_IRQHandler(void)
50. {
51. unsignedintdata;
52. unsignedcharerr;
53. OS_CPU_SRcpu_sr;
55. OS_ENTER_CRITICAL();/*TelluC/OS-IIthatwearestartinganISR*/
56. OSIntNesting++;
57. OS_EXIT_CRITICAL();
59. if(USART2->SR&0x0F)
60. {
61. //Seeifwehavesomekindoferror
62. //Clearinterrupt(donothingaboutit!)
63. data=USART2->DR;
64. }
65. elseif(USART2->SR&USART_FLAG_RXNE)//ReceiveDataRegFullFlag
66. {
67. data=USART2->DR;
68. COMPutRxChar(COM2,data);//Insertreceivedcharacterintobuffer
69. }
70. elseif(USART2->SR&USART_FLAG_TXE)
71. {
72. data=COMGetTxChar(COM2,&err);//Getnextcharactertosend.
73. if(err==COMM_TX_EMPTY)
74. {//Dowehaveanymorecharacterstosend?
75. //No,DisableTxinterrupts
76. //USART_ITConfig(USART2,USART_IT_TXE|USART_IT_TC,DISABLE);
77. USART2->CR1&=~USART_FLAG_TXE|USART_FLAG_TC;
78. }
79. else
80. {
81. USART2->DR=data;//Yes,Sendcharacter
82. }
83. }
84. OSIntExit();
85. }

下面再给出个测试代码：

1. #include"stm32f10x.h"
2. #include"uart.h"
3. #include"led.h"
4. #include"COMMRTOS.H"
5. #include"ucos_ii.h"
7. #defineTASK_STK_SIZE128
8. OS_STKTaskStartStk[TASK_STK_SIZE];
9. OS_STKTaskUartReadStk[TASK_STK_SIZE];
11. voidTaskUartRead(void*pdata)
12. {
13. unsignedcharerr;
14. unsignedcharc;
16. for(;;)
17. {
18. c=CommGetChar(COM2,0,&err);
19. if(err==COMM_NO_ERR)
20. CommPutChar(COM2,c,0);
21. }
22. }
23. voidTaskStart(void*pdata)
24. {
25. SysTick_Config(SystemCoreClock/10);
26. USART1_Init();
27. USART2_Init();
28. COMInit();
29. //USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
30. //USART_ITConfig(USART2,USART_IT_RXNE,ENABLE);
31. USART1->CR1|=USART_FLAG_RXNE;
32. USART2->CR1|=USART_FLAG_RXNE;
34. OSTaskCreate(TaskUartRead,(void*)0,&(TaskUartReadStk[TASK_STK_SIZE-1]),2);
36. UART_PutStr(USART2,"USART2HelloWorld!\n\r");
37. //CommPutChar(COM2,+,0);
38. CommPutStr(COM2,"CommPutCharB\n\r");
39. for(;;)
40. {
41. LED_Spark();
42. CommPutChar(COM2,+,0);
43. OSTimeDly(10);
44. }
45. }
47. intmain(void)
48. {
49. SystemInit();
50. LED_Init();
51. OSInit();
52. OSTaskCreate(TaskStart,(void*)0,&(TaskStartStk[TASK_STK_SIZE-1]),1);
53. OSStart();
54. for(;;)
55. {
57. }
58. }