AT91SAM7X256串口通讯

#include <AT91SAM7X256.H> #include "UART0.H" #define Fosc 18432000 #define AT91B_MAIN_OSC 18432000 // Main Oscillator MAINCK #define AT91B_MCK ((18432000*73/14)/2) // Output PLL Clock AT91PS_PIO GPIO_A=AT91C_BASE_PIOA; AT91PS_USART UART0 =AT91C_BASE_US0; //---------------------------------------- AT91S_AIC * pAIC=AT91C_BASE_AIC; unsigned char DacContralBuff[16]; //---------------------------------------- void SendChar(unsigned char CH) { while(!(UART0->US_CSR&0X02)); UART0->US_THR=CH; } //---------------------------------------- unsigned char GetChar() { unsigned char ch; return ch; } //----------------------------------------- __irq void Usart0ISR(void) { *AT91C_AIC_ICCR|=(1 << AT91C_ID_US0); if(UART0->US_CSR&0X01) { DacContralBuff[0]=UART0->US_RHR&0xff; SendChar(DacContralBuff[0]); } *AT91C_AIC_EOICR = 0X00; } //================= __inline unsigned int AT91F_US_Baudrate ( const unsigned int main_clock, // /arg peripheral clock const unsigned int baud_rate) // /arg UART baudrate { unsigned int baud_value = ((main_clock*10)/(baud_rate * 16)); if ((baud_value % 10) >= 5) baud_value = (baud_value / 10) + 1; else baud_value /= 10; return baud_value; } //*---------------------------------------------------------------------------- //* /fn AT91F_US_SetBaudrate //* /brief Set the baudrate according to the CPU clock //*---------------------------------------------------------------------------- __inline void AT91F_US_SetBaudrate ( AT91PS_USART pUSART, // /arg pointer to a USART controller unsigned int mainClock, // /arg peripheral clock unsigned int speed) // /arg UART baudrate { //* Define the baud rate divisor register pUSART->US_BRGR = AT91F_US_Baudrate(mainClock, speed); } //*---------------------------------------------------------------------------- //* /fn AT91F_US_SetTimeguard //* /brief Set USART timeguard //*---------------------------------------------------------------------------- __inline void AT91F_US_SetTimeguard ( AT91PS_USART pUSART, // /arg pointer to a USART controller unsigned int timeguard) // /arg timeguard value { //* Write the Timeguard Register pUSART->US_TTGR = timeguard ; } //================= void Init_UART0() { // unsigned int temp=0; //GPIO_A->PIO_PER =0XfFFFFFFF; // GPIO_A->PIO_OER=0X03;//PA0,PA1设置为输出 // GPIO_A->PIO_SODR =0X03; //设置为高 *AT91C_PMC_PCER = (unsigned int)1<<AT91C_ID_US0; //允许US0口的时钟 GPIO_A->PIO_PDR =0x03; //设为外设 GPIO_A->PIO_ASR =0X03; //设为外设A UART0->US_CR|= AT91C_US_RSTRX | /* Reset Receiver */ AT91C_US_RSTTX ;//| /* Reset Transmitter */ //AT91C_US_RXDIS | /* Receiver Disable */ // AT91C_US_TXDIS; /* Transmitter Disable */ // UART0->US_MR=0X108C0; //主时钟，8位数据，一位停止位，无校验 ，高位在前，异步模式 UART0->US_MR=AT91C_US_USMODE_NORMAL | /* Normal Mode */ AT91C_US_CLKS_CLOCK | /* Clock = MCK */ AT91C_US_CHRL_8_BITS | /* 8-bit Data */ AT91C_US_PAR_NONE | /* No Parity *///OVER=1 溢出错误 AT91C_US_NBSTOP_1_BIT ; //|AT91C_US_MSBF; /* 1 Stop Bit */ //SYNC=0异步 SYNC=1同步 //异步模式 波特率＝MCK/16/BRD或MCK/8/BRD；同步为波特率＝MCK/BRD UART0->US_BRGR=AT91F_US_Baudrate(AT91B_MCK,9600);// (Fosc/(9600*16)); //AT91B_MCK // UART0->US_BRGR|=Fosc/(9600*16)<<8; //UART0->US_CR=0X50; UART0->US_CR |= AT91C_US_RXEN | /* Receiver Enable */ AT91C_US_TXEN; /* Transmitter Enable */ //UART0->US_IDR=0; //UART0->US_CSR//通道状态寄存器 2-发送状态，1-接收状态 /* Setup Usart Interrupt Mode and Vector with Priority 7 and Enable it */ // pAIC->AIC_SMR[AT91C_ID_US1] = 5;//设置触发模式和优先级7等级最高 pAIC->AIC_SMR[AT91C_ID_US0] = 6; //双串口中断方式接收数据需设优先级 UART0->US_IER =AT91C_US_RXRDY; //接收中断使能 // pUSART1->US_IER =AT91C_US_RXRDY; pAIC->AIC_SVR[AT91C_ID_US0] = (unsigned long) Usart0ISR;//串口0中断地址放入向量表 // pAIC->AIC_SVR[AT91C_ID_US1] = (unsigned long) Usart1ISR;//串口1中断地址放入向量表 pAIC->AIC_IECR |=(1 << AT91C_ID_US0)|(1 << AT91C_ID_US1);//串口中断使能 UART0->US_IER=0X01; //接受中断使能 }