STM32F10x 学习笔记7（USART实现串口通讯 3）

1. ARTx);
2. return(USARTx->DR&0xff);
3. }

1. #ifndef_COMMRTOS_H_
2. #define_COMMRTOS_H_
4. #ifndefCFG_H
6. #defineCOMM_RX_BUF_SIZE64/*NumberofcharactersinRxringbuffer*/
7. #defineCOMM_TX_BUF_SIZE64/*NumberofcharactersinTxringbuffer*/
9. #endif
11. /*
12. *********************************************************************************************************
13. *CONSTANTS
14. *********************************************************************************************************
15. */
16. #ifndefFALSE
17. #defineFALSE0x00
18. #endif
20. #ifndefTRUE
21. #defineTRUE0xff
22. #endif
24. #ifndefNUL
25. #defineNUL0x00
26. #endif
28. #defineCOM10
29. #defineCOM21
31. /*ERRORCODES*/
32. #defineCOMM_NO_ERR0/*Functioncallwassuccessful*/
33. #defineCOMM_BAD_CH1/*Invalidcommunicationsportchannel*/
34. #defineCOMM_RX_EMPTY2/*Rxbufferisempty,nocharacteravailable*/
35. #defineCOMM_TX_FULL3/*Txbufferisfull,couldnotdepositcharacter*/
36. #defineCOMM_TX_EMPTY4/*IftheTxbufferisempty.*/
37. #defineCOMM_RX_TIMEOUT5/*Ifatimeoutoccurredwhilewaitingforacharacter*/
38. #defineCOMM_TX_TIMEOUT6/*Ifatimeoutoccurredwhilewaitingtosendachar.*/
41. #defineCOMM_PARITY_NONE0/*Definesforsettingparity*/
42. #defineCOMM_PARITY_ODD1
43. #defineCOMM_PARITY_EVEN2
45. unsignedcharCommGetChar(unsignedcharch,unsignedshortto,unsignedchar*err);
46. voidCOMInit(void);
47. unsignedcharCommIsEmpty(unsignedcharch);
48. unsignedcharCommIsFull(unsignedcharch);
49. unsignedcharCommPutChar(unsignedcharch,unsignedcharc,unsignedshortto);
50. voidCommPutStr(unsignedcharch,uint8_t*str);
52. #endif

commrtos.c 的代码如下：

1. #include"stm32f10x_usart.h"
2. #include"includes.h"
3. #include"COMMRTOS.H"
5. /*
6. *DATATYPES
7. */
8. typedefstruct{
9. unsignedshortRingBufRxCtr;/*NumberofcharactersintheRxringbuffer*/
10. OS_EVENT*RingBufRxSem;/*PointertoRxsemaphore*/
11. unsignedchar*RingBufRxInPtr;/*Pointertowherenextcharacterwillbeinserted*/
12. unsignedchar*RingBufRxOutPtr;/*Pointerfromwherenextcharacterwillbeextracted*/
13. unsignedcharRingBufRx[COMM_RX_BUF_SIZE];/*Ringbuffercharacterstorage(Rx)*/
14. unsignedshortRingBufTxCtr;/*NumberofcharactersintheTxringbuffer*/
15. OS_EVENT*RingBufTxSem;/*PointertoTxsemaphore*/
16. unsignedchar*RingBufTxInPtr;/*Pointertowherenextcharacterwillbeinserted*/
17. unsignedchar*RingBufTxOutPtr;/*Pointerfromwherenextcharacterwillbeextracted*/
18. unsignedcharRingBufTx[COMM_TX_BUF_SIZE];/*Ringbuffercharacterstorage(Tx)*/
19. }COMM_RING_BUF;
21. /*
22. *GLOBALVARIABLES
23. */
24. COMM_RING_BUFComm1Buf;
25. COMM_RING_BUFComm2Buf;
27. staticvoidCOMEnableTxInt(unsignedcharport)
28. {
29. staticUSART_TypeDef*map[2]={USART1,USART2};
30. //USART_ITConfig(map[port],USART_IT_TXE,ENABLE);
31. map[port]->CR1|=USART_FLAG_TXE;
32. }
34. /*
35. *********************************************************************************************************
36. *REMOVECHARACTERFROMRINGBUFFER
37. *
38. *
39. *Description:Thisfunctioniscalledbyyourapplicationtoobtainacharacterfromthecommunications
40. *channel.Thefunctionwillwaitforacharactertobereceivedontheserialchannelor
41. *untilthefunctiontimesout.
42. *Arguments:chistheCOMMportchannelnumberandcaneitherbe:
43. *COMM1
44. *COMM2
45. *toistheamountoftime(inclockticks)thatthecallingfunctioniswillingto
46. *waitforacharactertoarrive.Ifyouspecifyatimeoutof0,thefunctionwill
47. *waitforeverforacharactertoarrive.
48. *errisapointertowhereanerrorcodewillbeplaced:
49. **errissettoCOMM_NO_ERRifacharacterhasbeenreceived
50. **errissettoCOMM_RX_TIMEOUTifatimeoutoccurred
51. **errissettoCOMM_BAD_CHifyouspecifyaninvalidchannelnumber
52. *Returns:Thecharacterinthebuffer(orNULifatimeoutoccurred)
53. *********************************************************************************************************
54. */
56. unsignedcharCommGetChar(unsignedcharch,unsignedshortto,unsignedchar*err)
57. {
58. unsignedcharc;
59. unsignedcharoserr;
60. COMM_RING_BUF*pbuf;
61. OS_CPU_SRcpu_sr;
63. switch(ch)
64. {/*Obtainpointertocommunicationschannel*/
65. caseCOM1:
66. pbuf=&Comm1Buf;
67. break;
69. caseCOM2:
70. pbuf=&Comm2Buf;
71. break;
73. defau