static void clear_iir() {
uint8_t iir;
while (! ((iir = read_iir()) & IIR_PENDING)) {
switch(iir & IIR_REASON) {
case IIR_MSR:
read_msr();
break;
case IIR_THR:
break;
case IIR_RDA:
case IIR_TIME:
while (read_lsr() & LSR_DATA_READY) {
handle_char(read_rbr());
}
break;
case IIR_LSR:
read_lsr();
break;
}
}
}
static bool clear_iir(void) {
uint8_t iir;
while (! ((iir = read_iir()) & IIR_PENDING)) {
switch(iir & IIR_REASON) {
case IIR_RDA:
case IIR_TIME:
while (read_lsr() & LSR_DATA_READY) {
bool result = handle_char();
if (result) {
return result;
}
}
default:
break;
}
}
return false;
}
void uart_init(unsigned uart, unsigned baud)
{
unsigned divisor;
uart_base = (void *)(0xb0030000 + (uart * 0x1000));
uart_baud = baud;
divisor = (uart_clk + (uart_baud * (16 / 2))) / (16 * uart_baud);
if (configure_uart_clock_and_pinmux(uart))
return; /* No Uart support is possible */
while (!(read_lsr() & LSR_TEMT));
write_ier(0);
write_lcr(LCR_BKSE | LCR_8N1);
write_dll(0);
write_dlm(0);
write_lcr(LCR_8N1);
write_mcr(MCR_DTR | MCR_RTS);
write_fcr(FCR_FIFO_EN | FCR_RXSR | FCR_TXSR | FCR_UME);
write_lcr(LCR_BKSE | LCR_8N1);
write_dll(divisor & 0xff);
write_dlm((divisor >> 8) & 0xff);
write_lcr(LCR_8N1);
}
static void wait_for_fifo() {
while(! (read_lsr() & (LSR_EMPTY_DHR | LSR_EMPTY_THR)));
fifo_used = 0;
}
