ARM9教程DSP教程FPGA教程CPLD教程12A软硬件设计0229(17)

ARM9教程DSP教程FPGA教程CPLD教程12A软硬件设计0229

int retval;

if ( buffer->head != buffer->tail ) {

*buf = buffer->buffer[buffer->tail++]; if ( buffer->tail == buffer->buffer_size ) {

buffer->tail = 0; }

retval = 1; } else {

retval = 0; }

return retval; }

void srl0_send_byte( unsigned int base, unsigned char val, srl0_transmit_buffer_t *buffer ) {

unsigned short next; next = buffer->head + 1;

if ( next == buffer->buffer_size ) next = 0; while ( next == buffer->tail ) __asm( "nop" ); buffer->buffer[buffer->head] = val; if ( buffer->busy ) {

buffer->head = next;

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