LPC1788學習之串口學習-寄存器操做數組
接收數據使用中斷接收---發送暫時是直接發送--簡單的寄存器操做-記下不忘記！緩存
#include "uart_lpc1788.h"
uint32_t Receive_Sign; //接收數據下標--接收數據個數
uint8_t Receive_Buf[UART_RING_BUFSIZE]; //接收數組
/*-----------------------串口0初始化------------------*/
void Uart0_Init(uint32_t clk, uint32_t baudrate)
{
uint32_t tmp;
uint16_t divisorInt;
LPC_IOCON->P0_2=0X21;
LPC_IOCON->P0_3=0X21;
LPC_SC->PCONP |= (1<<3); //外設時鐘使能
//---------------------------------------------
LPC_UART0->FCR=0X07;
LPC_UART0->FCR=0X00;
while (LPC_UART0->LSR & 0X01)
{
tmp = LPC_UART0->RBR; //假讀取去清空
}
LPC_UART0->TER = 0x80;
while (!(LPC_UART0->LSR & 0x20));
LPC_UART0->TER = 0;
LPC_UART0->IER = 0;
LPC_UART0->LCR = 0;
LPC_UART0->ACR = 0;
LPC_UART0->RS485CTRL = 0;
LPC_UART0->RS485DLY = 0;
LPC_UART0->ADRMATCH = 0;
tmp = LPC_UART0->LSR; //獲取線狀態寄存器
//-------------------------------------
divisorInt =Uart0GetDivisorByBaudrate(clk,baudrate);
LPC_UART0->LCR |= 0x80; //使能訪問除數寄存器
LPC_UART0->DLM = (divisorInt>>8) & 0xFF;
LPC_UART0->DLL = divisorInt & 0xFF;
LPC_UART0->LCR &= (~0x80) & 0xFF; //禁止訪問
//------------------------------------------
tmp = (LPC_UART0->LCR & (0x80 | 0x40)) & 0xFF;
tmp |= 0x03; //8位數據-1箇中止位-禁止奇偶校驗
LPC_UART0->LCR = (uint8_t)(tmp & 0xFF);
//----------------------------------------------
tmp=0;
tmp |= 0x01; //使能FIFO
tmp |= 0x00; //觸發點0-一個字符觸發中斷
tmp |= 0x04; //發送緩存
tmp |= 0x02; //接收緩存
LPC_UART0->FCR = tmp & 0xFF;
//------------------------------------------------
LPC_UART0->TER |= 0x80;//發送使能
LPC_UART0->IER|= 0x01& 0x307; //使能RD數據接收中斷
LPC_UART0->IER|= 0x04& 0x307; //使能RX線狀態中斷
//----------------------------------------------------
Receive_Sign=0;
//--------------------------------------
NVIC_SetPriority(UART0_IRQn, ((0x01<<3)|0x01));
NVIC_EnableIRQ(UART0_IRQn);
}
/*-------------------串口0中斷函數----------------------*/
void UART0_IRQHandler(void)
{
uint32_t tmp, tmp1;
tmp = ((LPC_UART0->IIR) & 0x3CF) & (7<<1); //獲取中斷標識
if (tmp == (3<<1)) //線狀態中斷
{
tmp1 = ((LPC_UART0->LSR) & 0xFF);
tmp1 &= ((1<<1) | (1<<2) | (1<<3)| (1<<4) | (1<<7));
if (tmp1) //有錯誤
{
while (1){}
}
}
if ((tmp == (2<<1)) || (tmp == (6<<1)))//接收數據中斷--超時中斷
{
Receive_Buf[Receive_Sign]= (LPC_UART0->RBR & 0xFF); //讀取數據
Receive_Sign++;
}
if (tmp == (1<<1))//THRE發送中斷
{
//UART_IntTransmit(); //發送數據--未使用
}
}
/*-----------發送指定數組----------------*/
void UART0_SendStr(uint8_t *txbuf)
{
uint8_t *pChar = txbuf;
while(*pChar!='\0')
{
while (!(LPC_UART0->LSR & (1<<5)));//發送保持寄存器爲空
LPC_UART0->THR = (*pChar) & 0xFF; //發送數據
pChar++;
}
}
/*---------發送指定數組的指定長度-----不知道爲啥-buflen不能使用sizeof函數----------*/
void UART0_SendStrNum(uint8_t *txbuf,uint32_t buflen)
{
uint16_t i;
uint8_t *pChar = txbuf;
for(i=0;i<buflen;i++)
{
while (!(LPC_UART0->LSR & (1<<5)));//發送保持寄存器爲空
LPC_UART0->THR = (*pChar) & 0xFF; //發送數據
pChar++;
}
}
/*----------根據外設頻率與波特率計算分頻寄存器的值----------*/
uint16_t Uart0GetDivisorByBaudrate(uint32_t clk, uint32_t baudrate)
{
float divisor;
uint16_t divisorInt;
divisor = (float)clk/(baudrate*16);
divisorInt = (uint16_t)(divisor/256);
divisor-=(divisorInt*256);
if ((divisor - (uint32_t)divisor) > 0.5F) //四捨五入
{
divisorInt = (divisorInt << 8) | ((uint8_t)divisor + 1);
}
else
{
divisorInt = (divisorInt << 8) | (uint8_t)divisor;
}
return divisorInt; //高8位-DLM--低8位-DLL
}函數