ARM9教程DSP教程FPGA教程CPLD教程12A软硬件设计0229(13)

ARM9教程DSP教程FPGA教程CPLD教程12A软硬件设计0229

} } }

int _write( int fd, const char * buf, int size ) {

for ( fd = 0; fd < size; fd++ ) {

srl0_send_byte( Base_UART, *buf++, &transmit_buffer ); }

return size; }

int _read( int fd, char * buf, int size ) {

char val; int i;

for ( i = 0; i < size; i++ ) {

while ( srl0_receive_byte(&receive_buffer, &val) == 0 ); buf[i] = val; }

return i; }