日志
MICROBLAZE的UART_LITE驱动
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这是刚刚根据数据手册写的一个UART—LITE驱动。
#define DEF_UART_CTLR_ADDR 0x84000000
static unsigned int BASE_UART_ADDR = DEF_UART_CTLR_ADDR ;
static unsigned int init = 0 ;
static void init_uart(unsigned int addr)
{
BASE_UART_ADDR = addr;
if (addr==0)
BASE_UART_ADDR = DEF_UART_CTLR_ADDR ;
init=1;
*(unsigned int volatile *)(BASE_UART_ADDR + 0xc) = 0;
}
unsigned char lw_getc(void){
unsigned char ret ;
if (init==0)init_uart(0);
while(!(*(unsigned int volatile *)(BASE_UART_ADDR + 0x8) & (1 << (31 - 31))));//wait when rx FIFO is emputy
ret = *(unsigned int volatile *)(BASE_UART_ADDR );return ret;
}
void lw_putc( unsigned char ch){
if (init==0)init_uart(0);
while((*(unsigned int volatile *)(BASE_UART_ADDR + 0x8) & (1 << (31 - 28))));//wait when tx FIFO is full
*(unsigned int volatile *)(BASE_UART_ADDR + 4 )= ch ;
}
使用一下程序进行测试：
int i;
char hex[]={"0123456789abcedfghijklmp" };
int main (void) {
for(;;)
{
lw_putc(lw_getc());
}
/*
for(i=0;;){
i+=1;
i=i%10 ;
lw_putc(hex);
}
*/
}
测试通过。
