0--我的串口发送"hello word"程序

各位,附件是我的裸奔的串口发送"hello world"程序.
加载到0x0地址就可以运行了.
附件里面是源代码,需要建立project.编译
crazyarm 大侠都说能收到字符串了.
不知各位能不能收到.

 

查看了下你的代码，建议(*(volatile unsigned *) 全部改为 (*(volatile unsigned long *)及(*(volatile unsigned char *)貌似就没问题。不过貌似int型也是占4字节的，没仔细研究arm中的规定

 

貌似是这个原因#define UTXH0      (*(volatile unsigned char *)0x50000023)    改为#define UTXH0      (*(volatile unsigned char *)0x50000020)。因0x50000023为Big Endian地址值

 

crazyARM
你就是我的神呀.
我永远是你的人呀.
您经验丰富,学富五车
我是佩服肝脑涂地呀.
原来是这个问题让我无法弄懂串口通信呀.

 

#defineGPBCON(*(volatile unsigned long *)0x56000010)#defineGPBDAT(*(volatile unsigned long *)0x56000014)#define GPHCON (*(volatile unsigned *)0x56000070)//Port H control#define GPHDAT (*(volatile unsigned *)0x56000074)//Port H data#define GPHUP (*(volatile unsigned *)0x56000078)//Pull-up control H#define ULCON0 (*(volatile unsigned *)0x50000000)//UART 0 Line control#define UCON0 (*(volatile unsigned *)0x50000004)//UART 0 Control#define UFCON0 (*(volatile unsigned *)0x50000008)//UART 0 FIFO control#define UMCON0 (*(volatile unsigned *)0x5000000c)//UART 0 Modem control#define UTRSTAT0 (*(volatile unsigned *)0x50000010)//UART 0 Tx/Rx status#define UERSTAT0 (*(volatile unsigned *)0x50000014)//UART 0 Rx error status#define UFSTAT0 (*(volatile unsigned *)0x50000018)//UART 0 FIFO status#define UMSTAT0 (*(volatile unsigned *)0x5000001c)//UART 0 Modem status#define UBRDIV0 (*(volatile unsigned *)0x50000028)//UART 0 Baud rate divisor#define UTXH0 (*(volatile unsigned char *)0x50000023)//UART 0 Transmission Hold#define CLKDIVN (*(volatile unsigned *)0x4c000014)//Clock divider control#define MPLLCON (*(volatile unsigned *)0x4c000004)//MPLL Control#defineGPB5_out(1<<(5*2))#defineGPB6_out(1<<(6*2))#defineGPB7_out(1<<(7*2))#defineGPB8_out(1<<(8*2))#define TXD0READY (1<<2)#define RXD0READY (1)#define PCLK 50000000 //init.c中的clock_init函数设置PCLK为50MHz#define UART_CLK PCLK //UART0的时钟源设为PCLK#define UART_BAUD_RATE 115200 //波特率定义#define UART_BRD ((UART_CLK / (UART_BAUD_RATE * 16)) - 1)#define S3C2410_MPLL_200MHZ ((0x5c<<12)|(0x04<<4)|(0x00))void init_uart0(void){ GPHCON = 0x00faaa; GPHUP = 0x7ff; // The pull up function is disabled GPH[10:0] UFCON0 = 0x00; //不使用FIFO UMCON0 = 0x00; //不使用流控 ULCON0 = 0x03; //8N1(8个数据位、无较验、1个停止位) UCON0 = 0x245; //查询方式，UART时钟源为PCLK UBRDIV0=UART_BRD;}//发送一个字符void putc(unsigned char c){ //等待，直到发送缓冲区中的数据已经全部发送出去 while (!(UTRSTAT0 & TXD0READY)); //向UTXH0寄存器中写入数据，UART即自动将它发送出去 UTXH0 = c;}void init_clock(void){ CLKDIVN = 0x03; // FCLK:HCLK:PCLK=1:2:4, HDIVN=1,PDIVN=1 /* 如果HDIVN非0，CPU的总线模式应该从“fast bus mode”变为“asynchronous bus mode” */__asm__( "mrc p15, 0, r1, c1, c0, 0/n" /* 读出控制寄存器 */ "orr r1, r1, #0xc0000000/n" /* 设置为“asynchronous bus mode” */ "mcr p15, 0, r1, c1, c0, 0/n" /* 写入控制寄存器 */ ); MPLLCON = S3C2410_MPLL_200MHZ; /* 现在，FCLK=200MHz,HCLK=100MHz,PCLK=50MHz */}void wait(volatile unsigned long dly){for(; dly > 0; dly--);}int main(void){unsigned long i = 0,j;GPBCON = GPB5_out|GPB6_out|GPB7_out|GPB8_out;// 将LED1-4对应的GPB5/6/7/8四个引脚设为输出init_clock();j = 16000;i=0;init_uart0();while (j) {j--;wait(128000);putc('h');putc('e');putc('l');putc('l');putc('o');GPBDAT = (~(1 << (5+i))); // 根据i的值，点亮LED1-4if (++i == 2)i = 0;}return 0;}