S3C2440之UART驱动代码模板（RealView MDK）

好记心不如烂笔头，为方便以后查看代码及代码重复利用，这里贴出S3C2440 UART驱动代码。使用友善MINI2440开发板，开发环境为RealView MDK 4.22。需要注意的是，本代码中，，对GPIO的初始化放在了s3c2440.s中完成，采用keil自带的html方式进行配置。

该源码结构简单明了，原始工程下载地址：点击打开链接

UART控制器初始化：

void Uart_Init(void){#define rULCON0(*(volatile unsigned int*)0x50000000)#define rUCON0(*(volatile unsigned int*)0x50000004)#define rUBRDIV0(*(volatile unsigned int*)0x50000028)#define PCLK50000000#define BUADRATE115200rULCON0 = 0x03;//No parity, One stop bit, 8-bits datarUCON0= 0x05;//Tx Enable, Rx Enable, PCLK as source clockrUBRDIV0 = (int)(PCLK / (BUADRATE * 16)) – 1;//115200bps}

字符发送函数：

void Uart_Putc(unsigned char c){#define rUTRSTAT0(*(volatile unsigned int*)0x50000010)#define rUTXH0(*(volatile unsigned int*)0x50000020)#define BUFFER_EMPTY(1 << 1)while(!(rUTRSTAT0 & BUFFER_EMPTY));rUTXH0 = c;}字符接收函数：unsigned char Uart_Getc(void){#define rUTRSTAT0(*(volatile unsigned int*)0x50000010)#define rURXH0(*(volatile unsigned int*)0x50000024)#define BUFFER_READY(1 << 0)while(!(rUTRSTAT0 & BUFFER_READY));return rURXH0;}为了使用printf库函数，需要进行如下重映射：struct __FILE { int handle; /* Whatever you require here. If the only file you are using is */ /* standard output using printf() for debugging, no file handling */ /* is required. */ }; /* FILE is typedef'd in stdio.h. */ FILE __stdout; int fputc(int ch, FILE *f) {Uart_Putc(ch);return ch; } int ferror(FILE *f) { /* Your implementation of ferror */ return EOF;}测试代码：int main(void){unsigned char ch;//clock_init();Uart_Init();printf("%s, %d", __FILE__, __LINE__);while(1){ch = Uart_Getc();Uart_Putc(ch);}}

真正的强者，不是流泪的人，而是含泪奔跑的人。