文章目錄

工程結(jié)構(gòu)：

原理圖：

main.c

/*** Interrupt Registers Definition*/ sfr IE = 0xA8; /* Interrupt Enable Register */ sfr IE2 = 0xAF;/*** Interrupt Registers Bits Definition*/ /** IE */ #define GLOBAL_IE_EA (0x80) #define UART_IE_ES (0x10) /** IE2 */ #define T2_IE2_ET2 (0x04)/*** Port Switch Register*/ sfr P_SW2 = 0xBA;/*** Port Switch Register Bits Definition*/ #define P_SW2_EAXFR (0x80)/*** UART Registers Definition*/ sfr SCON = 0x98; /* Serial Control */ sfr SBUF = 0x99; /* Serial Buffer *//*** UART Registers Bits Definition*/ /** SCON */ #define UART_SCON_SM0 (0x80) /* UART - Serial Mode Selection Bit 0 */ #define UART_SCON_SM1 (0x40) /* UART - Serial Mode Selection Bit 1 */ #define UART_SCON_REN (0x10) /* UART - Receiver Enable */ #define UART_SCON_TI (0x02) /* UART - Transmission Completion Interrupt */ #define UART_SCON_RI (0x01) /* UART - Reception Completion Interrupt */sbit TI = SCON^1; sbit RI = SCON^0;/*** Timer 2 Registers Definition*/ #define TM2PS (*(unsigned char volatile xdata *)0xFEA2) /* Timer 2 Prescaler Register */ sfr T2L = 0xD7; /* Timer 2 Counter Low Register */ sfr T2H = 0xD6; /* Timer 2 Counter High Register *//*** Auxiliary Register Definition*/ sfr AUXR = 0x8E; /* Auxiliary Register *//*** Auxiliary Register Bits Definition*/ /** AUXR */ #define T2_AUXR_T2R (0x10) /* Timer 1 - Run Control */ #define T2_AUXR_T2_CT (0x08) /* Timer 1 - Counter or Timer Selection */ #define T2_AUXR_T2x12 (0x04) /* Timer 1 - Clock Divider Control */ #define UART_AUXR_S1ST2 (0x01) /* UART - Serial 1 (UART) Select Timer 2 Acts As Baud Rate Generator *//*** Port 1 Registers Definition*/ sfr P1 = 0x90; /* Port 1 Register */ sfr P1M1 = 0x91; /* Port 1 Configuration Register 1 */ sfr P1M0 = 0x92; /* Port 1 Configuration Register 0 *//*** Port 1 Registers Bits Definition*/ #define P12M1 (0x04) /* P1.2 - Mode Selection Bit 1 */ #define P12M0 (0x04) /* P1.2 - Mode Selection Bit 0 */#define enableInterrupts() IE |= GLOBAL_IE_EA #define disableInterrupts() IE &= ~GLOBAL_IE_EA#define INTERNAL_RC_OSCILLATOR_FREQUENCY_11059200HZ (11059200UL) /* 11.0592 MHz */ #define INTERNAL_RC_OSCILLATOR_FREQUENCY_12000000HZ (12000000UL) /* 12.0000 MHz */#define SYSTEM_CLOCK (INTERNAL_RC_OSCILLATOR_FREQUENCY_11059200HZ)#define UART_BAUD_RATE_9600 (9600L)sbit LED = P1^2; /* LED Control Bit. 0: On, 1: Off *//*** UART - Mode 1*/ void main() {unsigned int prescaler = 0;unsigned int divider = 0;unsigned int timer = 0;/** UART Initialization */SCON &= ~UART_SCON_SM0;SCON |= UART_SCON_SM1;SCON |= UART_SCON_REN; // 允許 UART 接收SCON &= ~UART_SCON_TI; // 清除發(fā)送中斷標(biāo)志SCON &= ~UART_SCON_RI; // 清除接收中斷標(biāo)志AUXR |= UART_AUXR_S1ST2; // 選擇 T2 作為波特率發(fā)生器IE |= UART_IE_ES; // 允許 UART1 請(qǐng)求中斷/** Timer 2 Initialization */AUXR &= ~T2_AUXR_T2_CT; // T2 作為定時(shí)器（對(duì)內(nèi)部系統(tǒng)時(shí)鐘進(jìn)行計(jì)數(shù)）P_SW2 |= P_SW2_EAXFR; // 允許訪問位于擴(kuò)展 RAM 區(qū)的特殊功能寄存器TM2PS = 1; // 對(duì) T2 的時(shí)鐘進(jìn)行 1 分頻。分頻公式：系統(tǒng)時(shí)鐘 ÷ (TM2PS + 1)prescaler = TM2PS + 1;P_SW2 &= ~P_SW2_EAXFR; // 禁止訪問位于擴(kuò)展 RAM 區(qū)的特殊功能寄存器AUXR |= T2_AUXR_T2x12; // 不分頻 T2 的時(shí)鐘 // AUXR &= ~T2_AUXR_T2x12; // 對(duì) T2 的時(shí)鐘進(jìn)行 12 分頻divider = ((AUXR & T2_AUXR_T2x12) == T2_AUXR_T2x12) ? 1 : 12;timer = (65536 - SYSTEM_CLOCK / 4 / divider / prescaler / UART_BAUD_RATE_9600);T2H = timer >> 8;T2L = timer;IE2 &= T2_IE2_ET2; // 禁止 T2 請(qǐng)求中斷AUXR |= T2_AUXR_T2R; // 允許 T2 開始計(jì)數(shù)/** IO Initialization */P1M1 &= ~P12M1;P1M0 |= P12M0;enableInterrupts();while(1) {} }void uartInterruptService() interrupt 4 {unsigned char buffer;if(RI) {RI = 0;buffer = SBUF; // Get dataSBUF = buffer; // Set dataLED = !LED;}if(TI) {TI = 0;} }

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