at91sam7x256的程序，uart0，接收和发送都能得到数据，但是数据不正确， (amobbs.com 阿莫电子技术论坛) -

xjq2008xz 发表于 2010-6-7 12:09:08

at91sam7x256的程序，uart0，接收和发送都能得到数据，但是数据不正确，

at91sam7x256的程序，uart0，接收和发送都能得到数据，
但是数据不正确，
发送出来的数据0XAA，但是串口调试助手受到的是0xfe
代码如下：
#include <AT91SAM7X256.H>
#include "UART0.H"
#defineFosc 18432000
AT91PS_PIO GPIO_A=AT91C_BASE_PIOA;
AT91PS_USARTUART0 =AT91C_BASE_US0;
//----------------------------------------
AT91S_AIC * pAIC=AT91C_BASE_AIC;
unsigned char DacContralBuff;
//----------------------------------------
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=UART0->US_RHR&0xff;
SendChar(DacContralBuff);
}
*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=Fosc/(9600*16); //AT91F_US_Baudrate(Fosc,9600);//
// 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 = 5;//设置触发模式和优先级7等级最高
pAIC->AIC_SMR = 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 = (unsigned long) Usart0ISR;//串口0中断地址放入向量表
// pAIC->AIC_SVR = (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

}

//----------------------------------------
//-----------------------------------------------------------------------------
int main()
{
unsigned int i=0;
AT91F_LowLevelInit();
Init_GPIO();
Init_UART0();
//US0_init();
   while(1)
   {
   delay(0xffff);
   i=~GPIO_B->PIO_PDSR;
if((i&Key1)==Key1)
GPIO_B->PIO_CODR|=LED1;
else
GPIO_B->PIO_SODR|=LED1;
if((i&Key2)==Key2)
GPIO_B->PIO_CODR|=LED2;
else
GPIO_B->PIO_SODR|=LED2;
if((i&Key3)==Key3)
GPIO_B->PIO_CODR|=LED3;
else
GPIO_B->PIO_SODR|=LED3;
if((i&Key4)==Key4)
GPIO_B->PIO_CODR|=LED4;
else
GPIO_B->PIO_SODR|=LED4;
// i=GPIO_B->PIO_ODSR;
SendChar(0X55);
// LED_Display();
// while(!(*AT91C_US0_CSR&0x02));
// *AT91C_US0_THR=0xaa;
delay(0xffffF);
   }
   return 0;
}
//-------------------------------

void AT91F_LowLevelInit(void)

{

unsigned char i;

// 1 Wait State necessary to work at 48MHz

AT91C_BASE_MC->MC_FMR = AT91C_MC_FWS_1FWS;

/////////////////////////////////////////////////////////////////////////////////////////////////////

// Init PMC Step 1. Enable Main Oscillator 使能主振荡时钟

// Main Oscillator startup time is board specific:

// Main Oscillator Startup Time worst case (3MHz) corresponds to 15ms (0x40 for AT91C_CKGR_OSCOUNT field)

/////////////////////////////////////////////////////////////////////////////////////////////////////

AT91C_BASE_PMC->PMC_MOR = (( AT91C_CKGR_OSCOUNT & (0x40 <<8) | AT91C_CKGR_MOSCEN ));

// Wait Main Oscillator stabilization

while(!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MOSCS));

/////////////////////////////////////////////////////////////////////////////////////////////////////

// Init PMC Step 2. 配置PLL输出时钟和USB时钟18.432 * (72+1)/14 = 96,109MHz

// Set PLL to 96MHz (96,109MHz) and UDP Clock to 48MHz

// PLL Startup time depends on PLL RC filter: worst case is choosen

// UDP Clock (48,058MHz) is compliant with the Universal Serial Bus Specification (+/- 0.25% for full speed)

/////////////////////////////////////////////////////////////////////////////////////////////////////

AT91C_BASE_PMC->PMC_PLLR = AT91C_CKGR_USBDIV_1 | AT91C_CKGR_OUT_0 | AT91C_CKGR_PLLCOUNT |

   (AT91C_CKGR_MUL & (72 << 16)) | (AT91C_CKGR_DIV & 14);

// Wait for PLL stabilization

while( !(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCK) );

// Wait until the master clock is established for the case we already turn on the PLL

while( !(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY) );

/////////////////////////////////////////////////////////////////////////////////////////////////////

// Init PMC Step 3. 配置MCK为PLL输出分频2，处理器时钟PCK等于MCK

// Selection of Master Clock MCK (equal to Processor Clock PCK) equal to PLL/2 = 48MHz

// The PMC_MCKR register must not be programmed in a single write operation (see. Product Errata Sheet)

/////////////////////////////////////////////////////////////////////////////////////////////////////

/*
AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_PRES_CLK_2;// 分频2

// Wait until the master clock is established

while( !(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY) );

AT91C_BASE_PMC->PMC_MCKR |= AT91C_PMC_CSS_PLL_CLK;//选PLL为时钟

// Wait until the master clock is established

while( !(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY) );

*/
/////////////////////////////////////////////////////////////////////////////////////////////////////

//Disable Watchdog (write once register)

/////////////////////////////////////////////////////////////////////////////////////////////////////

AT91C_BASE_WDTC->WDTC_WDMR = AT91C_WDTC_WDDIS;

////////////////////////////////////////////////////////////////////////////////////////////////////

//Init AIC: assign corresponding handler for each interrupt source

/////////////////////////////////////////////////////////////////////////////////////////////////////
/*
AT91C_BASE_AIC->AIC_SVR = (int) AT91F_Default_FIQ_handler ;

for (i = 1; i < 31; i++)

{

   AT91C_BASE_AIC->AIC_SVR = (int) AT91F_Default_IRQ_handler ;

}

AT91C_BASE_AIC->AIC_SPU = (unsigned int) AT91F_Spurious_handler;
*/
}

各位用这个片子的朋友帮我看一下，问题出哪儿了

xjq2008xz 发表于 2010-6-7 16:16:14

竟然无人回答，
菜鸟我搞定了

h85968099 发表于 2010-8-9 09:37:06

原因呢？

zfc_zhao 发表于 2010-10-19 09:12:40

看样子像时钟问题

页: [1]

amobbs.com 阿莫电子技术论坛's Archiver

at91sam7x256的程序，uart0，接收和发送都能得到数据，但是数据不正确，