ok6410开发板_uart_poll方式

 

      今天学习了ok6410的串口，用轮寻的方式查找串口的发送和中断。

共有4个文件head.S，uart.h，uart.c和Makefile：

head.S：

.global _start
_start:
bl main

 

uart.h：

#define    ULCON0        (*(volatile unsigned int *)0x7F005000)
#define    UCON0        (*(volatile unsigned int *)0x7F005004)
#define    UFCON0        (*(volatile unsigned int *)0x7F005008)
#define    UMCON0        (*(volatile unsigned int *)0x7F00500C)
#define    UTRSTAT0    (*(volatile unsigned int *)0x7F005010)
#define    UERSTAT0    (*(volatile unsigned int *)0x7F005014)
#define    UFSTAT0        (*(volatile unsigned int *)0x7F005018)
#define    UMSTAT0        (*(volatile unsigned int *)0x7F00501C)
#define    UTXH0        (*(volatile unsigned int *)0x7F005020)
#define    URXH0        (*(volatile unsigned int *)0x7F005024)
#define    UBRDIV0        (*(volatile unsigned int *)0x7F005028)
#define    UDIVSLOT0    (*(volatile unsigned int *)0x7F00502C)
#define    UINTP0        (*(volatile unsigned int *)0x7F005030)
#define    UINTSP0        (*(volatile unsigned int *)0x7F005034)
#define    UINTM0        (*(volatile unsigned int *)0x7F005038)

#define    GPACON        (*(volatile unsigned int *)0x7F008000)

uart.c：

#include "uart.h"

void init_gpm(void)
{
    GPACON = 0x2222; //uart mode
}

void init_uart(void)
{
    ULCON0 = 0x3; //8bit
    UCON0 = (3 << 10); //EXT_UCLK1
    UCON0 &= ~(1 << 10); //change EXT_UCLK1 to PCLK
    UCON0 |= (1 << 2); //Tx mode poll
    UCON0 |= (1 << 0); //Rx mode poll

    UFCON0 = 0; //non fifo
    UMCON0 = 0; //non modem

    UBRDIV0 = 34;
    UDIVSLOT0 = 0x1fff; //115200bps/s

    UINTM0 = 0xf; //mask interrupt
}

int uart_rx(void)
{
    while(!(UTRSTAT0 & 1));
    return URXH0;

}

void uart_tx(unsigned int ch)
{
    while (!(UTRSTAT0 & 0x2));
    UTXH0 = ch;
}


int main(void)
{
    unsigned int temp;
    init_gpm();
    init_uart();
    while(1)
    {
        temp = uart_rx();
        uart_tx(temp);
    }

    return 0;
}

 

Makefile：

all:
    arm-linux-gcc -c head.S    uart.c
    arm-linux-ld -Ttext=0x54000000 -o uart.elf head.o uart.o
    arm-linux-objcopy -O binary uart.elf uart.bin

clean:
    rm -rf *.o *.elf *.bin