「51系列串口通讯例程」.doc

51系列串口通讯例程.rar serial.c,1. /题目：串口初始化C代码 2. /要求: 3. /1.波特率1200bps,无奇偶校验，停止位1，数据位8 4. /2.定时器T1做波特率发生器 5. /软件模拟测试说明: 6. /1.这个测试采用查询方式进行串口通讯 7. /2.将软件仿真环境的晶震设为11.0592MHz 8. /3.软件模拟全速运行,观察波特率是1200bps 9. /4.在串口1中输入数字或字母,可观察到通讯是否有误。 10. /#pragmasrc 11. #include 12. /串口初始化 13. voidserial_init(void)14. 15. /ET1=0;/CLR0ABH;禁止T1中断 16. TMOD=0x20;/MOV89H,#20H;timer1mode2:8-Bitreload(定时器T1模式2:8位自动初值重装) 17. TH1=0xE8;/MOV8DH,#0E8H 18. TL1=0xE8;/MOV8BH,#0E8H;1200bps,11.059 19. TR1=1;/SETB8EH;启动定时器1 20. SCON=0x50;/mode1:10-bitUART,enablereceiver /(模式1:10位异步发送/接收,使能接收允许位)21. /SM1=1;/ ;串行口模式1 22. /SM0=0; 23. /REN=1;/;允许串行中断接收 24. SM2=1;/SETBO9DH;收到有效的停止位时才将RI置1 25. ES=1;/SETB0ACH;允许串行中断 26. EA=1;/SETB0AFH;总中断开 27. 28. /中断方式处理串口数据 29. voidserial(void)interrupt4using130. 31. if(RI)32. 33. /RI=0; 34. /串口接收,采用临时缓冲 35. 36. #if0 37. if(TI)38. 39. /TI=0; 40. /串口发送,没有必要使用中断方式 41. 42. #endif 43. 44. /查询方式接收串口数据 45. unsignedchargetchar(void)46. 47. while(!RI);/没有收到串口数据则一直等待 48. RI=0;49. returnSBUF;50. 51. /查询方式发送串口数据 52. voidputchar(unsignedcharch)53. 54. SBUF=ch;55. while(!TI);56. TI=0;57. 58. codeunsignedcharHEX_TAB=0123456789ABCDEF;59. voidputhex(unsignedcharch)60. 61. unsignedchari,j;62. i=ch4;63. j=ch&0x0f;64. putchar(HEX_TABi);65. putchar(HEX_TABj);66. 51系列串口通讯例程.rar test.c1. /采用查询方式进行串口通讯的例子 2. /采用这种方式的弊端: 3. /1.如果对方没有发送数据，则本机无限等待，而不能做其它事情 4. /2.如果对方发送数据而本机正做其它事情，那么有可能丢失数据。 5. /因此实际上串口接收常采用中断方式，串口发送则不需要。 6. #include 7. externvoidserial_init(void);8. externunsignedchargetchar(void);9. externvoidputchar(unsignedcharch);10. externvoidputhex(unsignedcharch);11. voidmain(void)12. 13. unsignedchari;14. serial_init();/串口初始化 15. do16. i=getchar();/如果没有收到串口数据则一直等待（查询接收串口数据的弊端）17. +i;18. -i;/观察断点 19. putchar(i);/在串口显示接收到的ASCII数据(就是把原来收到的数据再送回串口)20. putchar();21. putchar();22. putchar(0);23. putchar(x);24. puthex(i);/在串口以十六进制格式显示接收的ASCII数据 25. putchar();26. putchar();27. +i;28. -i;/观察断点 29. while(1);30. 8051串口程序8051串口程序.rar M0.ASM31. ;FILE: M0.ASM 32. ;THIS PROGRAM TRANSMITS THE HEX VALUE AA REPETITIVELY ACCROSS THE SERIAL PORT 33. ;OF A MCS-51 MICROCONTROLLER IN MODE 0 34. ; 35. ;DETAILS: 36. ; 37. ;MODE 0: SERIAL DATA EXITS AND ENTERS THROUGH THE RXD PIN. THE TXD PIN OUTPUTS 38. ;THE SHIFT CLOCK. IN MODE 0, 8 BITS ARE TRANSMITTED/RECEIVED STARTING WITH THE 39. ;LEAST SIGNIFICANT BIT. THE BAUD RATE IS FIXED TO 1/12 THE OSCILLATOR FREQUENCY. 40. ; 41. ; 42. ORG 00H 43. ; 44. JMP MAIN 45. MAIN: MOV SCON,#00H ;SET UP FOR MODE 0 46. CLR TI ;READY TO TRANSMIT 47. LOOP: MOV SBUF,#0AAH ;TRANSMIT AAH 48. JNB TI,$ ;WAIT FOR END OF TRANSMISSION 49. CLR TI ;CLEAR TRANSMIT FLAG 50. JMP LOOP ;DO IT ALL AGAIN 51. END 52. 8051串口程序.rar M1INT.ASM53. ;FILE: M1INT.ASM 54. ; 55. ;THIS PROGRAM RECEIVES A VALUE ENTERING INTO THE SERIAL PORT PIN RXD AND PUTS 56. ;THE DATA OUT TO PORT 1 57. ; 58. ; 59. ;DETAILS: 60. ; 61. ;THE PROGRAM IS DESIGNED TO BE IN A CONTINUOUS NEVER ENDING LOOP UNTIL A BYTE OF DATA HAS BEEN 62. ;COMPLETELY RECEIVED. THE LOOP IS EXITED BECAUSE OF THE OCCURANCE OF A SERIAL INTERRUPT. AFTER 63. ;THE INTERRUPT HAS BEEN SERVICED, THE PROGRAM GOES BACK INTO ITS ENDLESS LOOP UNTIL ANOTHER 64. ;INTERRUPT OCCURS 65. ; 66. ; 67. PCON EQU 87H ;DEFINE PCON REGISTER LOCATION 68. ; 69. ORG 00H 70. ; 71. JMP MAIN 72. ; 73. ORG 023H ;STARTING ADDRESS OF SERIAL INTERRUPT 74. JMP SERIAL_INT 75. ; 76. MAIN: MOV SCON, #50H ;SET UP SERIAL PORT FOR MODE 0 WITH RECEIVE ENABLED 77. MOV TMOD, #20H ;SET UP TIMER 1 AS AUTO-RELOAD 8-BIT TIMER 78. MOV TH1, #0DDH ;BAUD RATE EQUALS 2400 BAUD AT 16MhZ 79. MOV PCON, #80H ;SET THE DOUBLE BAUD RATE BIT 80. MOV IE, #81H 81. MOV TCON, #40H ;START TIMER 1 82. CLR RI ;ENSURE THAT THE RECEIVE INTERRUPT FLAG IS CLEAR 83. LOOP: JMP LOOP ;ENDLESS LOOP (UNLESS INTERRUPT OCCURS) 84. ; 85. SERIAL_INT: ;SERIAL INTERRUPT ROUTINE 86. CLR RI ;CLEAR THE RI BIT (SINCE WE KNOW THAT WAS THE BIT THAT CAUSED THE 87. ; INTERUPT) 88. MOV P1, SBUF ;MOVE THE RECEIVED DATA OUT TO PORT ONE 89. RETI ;EXIT THE SERIAL INTERRUPT ROUTINE 90. END8051串口程序.rar M1T1.ASM91. ;FILE: M1T1.ASM 92. ; 93. ;THIS PROGRAM TRANSMITS THE HEX VALUE AA REPETITIVELY ACCROSS THE SERIAL PORT 94. ;OF A MCS-51 IN MODE 1 USING TIMER 1 AT A RATE OF 2400 BAUD 95. ; 96. ;DETAILS: 97. ; 98. ;MODE 1: TEN BITS ARE TRANSMITTED THROUGH TXD OR RECEIVED THROUGH RXD 99. ;WITH THE START BIT FIRST (0), 8 DATA BITS WITH THE LEAST SIGNIFICANT BIT 100. ;FIRST, AND A STOP BIT (1). ON RECEIVE, THE STOP BIT GOES INTO RB8 IN 101. ;SPECIAL FUNCTION REGISTER SCON. THE BAUD RATE IS VARIABLE. 102. ; 103. PCON EQU 87H 104. 105. ORG 00H 106. JMP MAIN 107. MAIN: MOV SCON,#40H ;SET SERIAL PORT FOR MODE 1 OPERATION 108. MOV PCON,#80H ;SET DOUBLE BAUD RATE BIT 109. MOV TMOD,#20H ;SET TIMER 1 TO AUTO RELOAD 110. MOV TH1,#0DDH ;LOAD RELOAD VALUE FOR 2400 BAUD AT 16MHZ 111. MOV TCON,#40H ;START TIMER 1 112. CLR TI 113. LOOP: MOV SBUF,#053H ;TRANSMIT AA HEX OUT THE TXD LINE 114. JNB TI,$ ;WAIT UNTIL TRANSMISSION COMPLETED 115. CLR TI ;READY TO TRANSMIT ANOTHER 116. JMP LOOP ;DO IT ALL OVER AGAIN 117. END 118.8051串口程序.rar M2.ASM119. ;FILE: M2.ASM 120. ; 121. ;THIS PROGRAM TRANSMITS THE HEX VALUE AA REPETITIVELY ACCROSS THE SERIAL PORT 122. ;OF A MCS-51 IN MODE 2 AT A RATE OF 1/32 THE OSCILLATOR FREQUENCY 123. ; 124. ;DETAILS: 125. ; 126. ;MODE 2: 11 BITS ARE TRANSMITTED THROUGH TXD OR RECEIVED THROUGH RXD. 127. ;STARTING WITH A START BIT (0), 8 DATA BITS WITH THE LEAST SIGNIFICANT BIT 128. ;FIRST, A PROGRAMMABLE 9TH DATA BIT, AND A STOP BIT (1). ON TRANSMIT, THE 129. ;9TH DATA BIT, TB8 IN SCON, CAN BE ASSIGNED A VALUE OF 0 OR 1. FOR EXAMPLE 130. ;THE PARITY BIT, P FROM PSW, COULD BE MOVED INTO TB8. ON RECEIVE, THE NINTH 131. ;DATA BIT GOES INTO RB8 IN SCON WHILE THE STOP BIT IS IGNORED. (THE VALIDITY 132. ;OF THE STOP BIT CAN BE CHECKED WITH FRAMING ERROR DETECTION) THE BAUD RATE 133. ;IS PROGRAMABLE TO IETHER 1/32 OR 1/64 THE OSCILLATOR FREQUENCY. IF THE 134. ;SMOD1 BIT IN THE PCON REGISTER IS 0, THEN THE BAUD RATE IS 1/64 THE 135. ;OSCILLATOR FREQUENCY, IF SMOD1 IS 1, THE THE BAUD RATE IS 1/32 THE 136. ;OSCILLATOR FREQUENCY. 137. PCON EQU 87H 138. ORG 00H 139. JMP MAIN 140. MAIN: MOV SCON,#80H ;SET UP FOR MODE 2 141. MOV PCON,#80H ;BAUD RATE EQUALS 1/32 OSC. FREQ 142. CLR TI ;READY TO TRANSMIT 143. LOOP: MOV SBUF,#0AAH ;TRANSMIT AAH 144. JNB TI,$ ;WAIT FOR END OF TRANSMISSION 145. CLR TI ;READY TO TRANSMIT 146. JMP LOOP ;DO IT ALL AGAIN 147. END8051串口程序.rar M3T2.ASM148. ;FILE: M3T2.ASM 149. ;THIS PROGRAM TRANSMITS THE HEX VALUE AA REPETITIVELY ACCROSS THE SERIAL PORT 150. ;OF A MCS-51 IN MODE 3 USING TIMER 2 AS A BAUD RATE GENERATOR TO 151. ;GENERATE A BAUD RATE OF 2400 BAUD AT 16MHZ WITH A PARITY BIT 152. ; 153. ;DETAILS: 154. ; 155. ;MODE 3: 11 BITS ARE TRANSMITTED THROUGH TXD OR RECEIVED THROUGH RXD 156. ;TRANSMISSION STARTS WITH A START BIT (0), EIGHT DATA BITS WITH THE LEAST 157. ;SIGNIFICANT BIT FIRST, A PROGRAMMABLE 9TH DATA BIT, AND A STOP BIT (1). 158. ;MODE 3 IS THE SAME AS MODE 2 EXCEPT THAT MODE 3 HAS A VARIABLE 159. ;BAUD RATE 160. RCAP2H EQU 0CBH 161. RCAP2L EQU 0CAH 162. T2CON EQU 0C8H 163. ORG 00H 164. JMP MAIN 165. MAIN: MOV SCON,#0C0H ;SET UP FOR SERIAL MODE 3 166. MOV RCAP2H,#0FFH ;LOAD HIGH BYTE TO GENERATE 2400 BAUD AT 16MHZ 167. MOV RCAP2L,#30H ;LOAD LOW BYTE TO GENERATE 2400 BAUD AT 16MHZ 168. MOV T2CON,#14 ;TIMER 2 BAUD RATE GENERATOR AND START TIMER 169. MOV A,#0AAH ;PUT THE VALUE TO BE TRANSMITTED IN THE ACC 170. MOV C,P ;PARITY INFORMATION TO CARRY FLAG 171. MOV TB8,C ;PARITY INFO FROM CARRY TO PROGRAMABLE BIT * 172. ; *NOTE: THE CONTENTS OF THE CARRY FLAG IN THE 173. ; PSW MAY BE ALTERED 174. CLR TI ;READY TO TRANSMIT 175. LOOP: MOV SBUF,A ;TRANSMIT AAH 176. JNB TI,$ ;WAIT UNTIL DONE TRANSMITING 177. CLR TI ;READY TO TRANSMIT 178. JMP LOOP ;DO IT ALL OVER AGAIN 179. END 180.自编的C51串口程序1. #include 2. #defineF_CPU11059200/11.0592Mhz 3. #defineUART_BAND_RATE9600/9600band 4. typedefunsignedcharuint8_t;5. /typedefsignedcharint8_t; 6. typedefunsignedintuint16_t;7. /typedefsignedintint16_t; 8. typedefunsignedlonguint32_t;9. /typedefsignedlongint32_t; 10. /接收数据 11. uint8_treceive_start,receive_number=0,bus_changed;12. uint8_treceive_data100;13. uint8_t*uart_data_ptr;14. uint8_tuart_counter;15. voidsei(void)16. 17. EA=1;18. 19. /*20. voidcli(void)21. 22. EA=0;23. 24. */25. voiduart_init(void)26. /*initializeuart*/27. 28. /TH1=256-(F_CPU*(SMOD+1)/(384*UART_BAND_RATE);/mode1baud(SMOD=0OR1) 29. SCON=0x50;/mode1:8-bitUART,enable receiver 30. TMOD|=0x20;/timer1mode2:8-Bitreload 31. PCON|=0x80;/SMOD=1,baud*2 32. TH1=0xfA;/11.0592M,value9600baud33. TR1=1;/timer1run 34. ES=1;/UARTINTERRUPTopen35. 36. voiddelay(uint8_tdelay_time)37. 38. uint8_ti,j,k;39. for(i=0;i255;i+)40. 41. for(j=0;j200;j+)42. 43. for(k=0;k1)44. 45. receive_start=0;46. bus_changed=1;47. 48. / 49. 50. 51. voiduart_send(uint8_t*p,uint8_tsize)52. /*sendbuffertouart*/53. 54. uart_data_ptr=p;55. uart_counter=size;56. TI=0;57. SBUF=*uart_data_ptr;58. 59. voidexecute_cmd(void)60. 61. if(receive_data2=0x01)62. 63. P1=0x01;/p1.0=1; 64. 65. if(receive_data2=0x02)66. 67. P1=0x02;/p1.1=1; 68. 69. if(receive_data2=0x03)70. 71. P1=0x04;/p1.2=1; 72. 73. if(receive_data2=0x04)74. 75. P1=0x08;/p1.3=1; 76. 77. 78. intmain(void)79. 80. uart_init();81. sei();/允许中断 82. for(;)83. 84. if(bus_changed=1)/已接收 85. /if(receive_number=3) 86. 87. execute_cmd();/执行命令 88. uart_send(ok,2);89. delay(1);90. /接收到数据，发送ok 91. uart_send(receive_data,receive_number);92. bus_changed=0;93. receive_number=0;94. 95. /uart_send(yes,3); 96. delay(1);97. 98. UART.rar LED_check.c #include #defineucharunsignedchar charcodetab=0x88,0x83,0xC6,0xA1,0xF9,0xA4,0xB0,0x99; voidtimer(uchar); sbitP0_0=P00; main() uchari,a=3; SCON=0; for(;) P0_0=1; for(i=0;i4;i+) SBUF=taba; a-; while(!TI); TI=0; if(a=255)a=7; P0_0=0; timer(100); voidtimer(uchart) uchari; for(i=0;iT;I+)pre UART.rar pc2mcu.c 1. include 2. #defineucharunsignedchar 3. #defineSL 4. AVE0xF15. ucharreceive();6. voidsend();7. voiddelay();8. ucharp;9. main()10. TMOD=0x20;11. TH1=TL1=0xE5;12. PCON=0x00;/smod=0 13. TR1=1;14. SCON=0x70;15. P0=0xFE;16. while(1)17. p=receive();18. switch(p)19. case1:P1=0xC0;break;20. case2:P1=0xF9;break;21. case3:P1=0xA4;break;22. case4:P1=0xB0;break;23. case5:P1=0x99;break;24. case6:P1=0x92;break;25. case7:P1=0x82;break;26. case8:P1=0xF8;break;27. default:P1=0x00;break;28. 29. delay();30. 31. 32. ucharreceive()33. 34. while(RI!=0);35. RI=0;36. p=SBUF;37. return(p);38. 39. voiddelay()40. uchari,j,k;41. for(i=500;i0;i-)42. for(j=500;j0;j-)43. for(k=500;k0;k-);44. 45. 46. UART.rar pc2mcu2.c,1. #include 2. #includelcd_chuan.h 3. #defineucharunsignedchar 4. /voiddelay(); 5. /voiddis(ucharp); 6. ucharp;7. ucharrct15;8. ucharrct25;9. ucharrct35;10. ucharrct45;11. 12. ucharreceive()13. ucharp;14. REN=1;15. while(RI=0);16. RI=0;17. p=SBUF;18. return(p);19. 20. 21. main()22. 23. ucharr;24. TMOD=0x20;25. TH1=TL1=0xfd;/1200的初值=e5,9600=fd 26. PCON=0x00;/smod=0 27. TR1=1;28. SCON=0x60;29. RI=1;30. EA=0;31. InitLCD();32. while(1)33. r=receive();34. /displaylcd(0x80,r); 35. r=receive();36. /displaylcd(0x81,r); 37. r=receive();38. /displaylcd(0x82,r); 39. r=receive();40. /displaylcd(0x83,r); 41. r=receive();42. /displaylcd(0x84,r); 43. 44. / 45. 46. r=receive();47. /displaylcd(0x90,r); 48. r=receive();49. /displaylcd(0x91,r); 50. r=receive();51. /displaylcd(0x92,r); 52. r=receive();53. /displaylcd(0x93,r); 54. r=receive();55. /displaylcd(0x94,r); 56. 57. r=receive();58. /displaylcd(0x88,r); 59. r=receive();60. /displaylcd(0x89,r); 61. r=receive();62. /displaylcd(0x8a,r); 63. r=receive();64. /displaylcd(0x8b,r); 65. r=receive();66. /dis