TQ2440 serial port data transmission-EEWORLD

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Serial port printing, this is a good thing. The goal is to print the data transmitted from the board on the hyperterminal, that is, the data transmitted by the board can be displayed on the computer. This is relatively easy. I referred to the 2440lib.c file that comes with TQ. After initializing those reference chips and that c file, the program came out quickly. There are easier methods, but it is more impressive to write it yourself.

The procedure is as follows:

#include "2440addr.h"

#include "Option.h"

#include "def.h"

//Why doesn't it work once U32 is used?

unsigned int PCLK;

extern void Uart_Printf(char *fmt,...); //Function declaration, otherwise a warning will be displayed

extern void Uart_Select(int ch);

void delay(void) // Delay() is defined in 2440lib.c, but I accidentally redefined it. I was confused for a while

{

unsigned int i,j;

for(i=0;i<1000;i++)

for(j=0;j<1000;j++)

;

}

void My_uart_init(int mypclk,int mybuat) //Serial port initialization written by myself

{

unsigned int a;

rGPHCON = 0x0faaa; //0x1111 1010 1010 1010 select RTS, CTS, TXD, RXD

rGPHUP = 0x7ff; //Cancel all pull-up resistors [0; 10] A total of 11 I/O ports

if(mypclk == 0) //If it is 0, use the PCLK clock frequency in mpll. Here I used 50MHz, and it must be 50MHz

mypclk = PCLK; //Isn't the PCLK of mpll 50MHz? If you set mypclk to 0, it should be OK, but I haven't tried it.

rUFCON0 = 0x0;

rUFCON1 = 0x0;

rUFCON2 = 0x0; //FIFO disabled

rUMCON0 = 0x0;

rUMCON1 = 0x0; //Disable AFC, etc.

rULCON0 = 0x3; //Transmission word length 8 bytes

rUCON0 = 0x245; // [0,3] is reserved and cannot be set. Set Rx error status interrupt and Tx level interrupt. The settings of serial ports 1 and 2 are the same

rUBRDIV0 = ((int)(mypclk/(mybuat*16)))-1; // Provide serial clock for transmitter and receiver, see chip manual for calculation formula

rULCON1 = 0x3;

rUCON1 = 0x245;

rUBRDIV1 = ((int)(mypclk/(mybuat*16)))-1;

rULCON2 = 0x3;

rUCON2 = 0x245;

rUBRDIV2 = ((int)(mypclk/(mybuat*16)))-1;

for(a=0;a<100;a++);//delay, refer to 2440lib.c, my personal understanding should be

}

void Main(void)

{

Uart_Select(0); //Select serial port 0

My_uart_init(50000000,115200); // Give the clock 50MHz, baud rate 115200 serial port to work

Uart_Printf("\n\n"); //Test whether the input \n in 2440lib.c will be supplemented with \r, carriage return and line feed

delay();

while(1)

{

Uart_Printf("I love caimanjun more than myself\n"); //Print string

delay();

Uart_Printf("yes I do! \n");

delay();

}

Keywords：TQ2440 Reference address：TQ2440 serial port data transmission

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Recommended ReadingLatest update time:2024-11-16 14:41

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