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/*
* Copyright © 2013 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <ao.h>
#include <ao_serial.h>
struct ao_fifo ao_usart_rx_fifo;
struct ao_fifo ao_usart_tx_fifo;
uint8_t ao_usart_tx_started;
void
ao_debug_out(char c)
{
if (c == '\n')
ao_debug_out('\r');
#if 0
while (!(stm_usart1.sr & (1 << STM_USART_SR_TXE)));
stm_usart1.dr = c;
#endif
}
static void
_ao_serial_tx_start(void)
{
if (!ao_fifo_empty(ao_usart_tx_fifo) & !ao_usart_tx_started)
{
ao_usart_tx_started = 1;
#if 0
ao_fifo_remove(ao_usart_tx_fifo, usart->reg->dr);
#endif
}
}
void
lpc_usart_isr(void)
{
#if 0
uint32_t sr;
sr = usart->reg->sr;
usart->reg->sr = 0;
if (sr & (1 << STM_USART_SR_RXNE)) {
char c = usart->reg->dr;
if (!ao_fifo_full(ao_usart_rx_fifo))
ao_fifo_insert(ao_usart_rx_fifo, c);
ao_wakeup(ao_usart_rx_fifo);
if (stdin)
ao_wakeup(&ao_stdin_ready);
}
if (sr & (1 << STM_USART_SR_TC)) {
ao_usart_tx_started = 0;
_ao_usart_tx_start(usart);
ao_wakeup(ao_usart_tx_fifo);
}
#endif
}
int
_ao_serial_pollchar(void)
{
int c;
if (ao_fifo_empty(ao_usart_rx_fifo))
c = AO_READ_AGAIN;
else {
uint8_t u;
ao_fifo_remove(ao_usart_rx_fifo,u);
c = u;
}
return c;
}
char
ao_serial_getchar(void)
{
int c;
ao_arch_block_interrupts();
while ((c = _ao_serial_pollchar()) == AO_READ_AGAIN)
ao_sleep(&ao_usart_rx_fifo);
ao_arch_release_interrupts();
return (char) c;
}
void
ao_serial_putchar(char c)
{
ao_arch_block_interrupts();
while (ao_fifo_full(ao_usart_tx_fifo))
ao_sleep(&ao_usart_tx_fifo);
ao_fifo_insert(ao_usart_tx_fifo, c);
_ao_serial_tx_start();
ao_arch_release_interrupts();
}
void
ao_serial_drain(void)
{
ao_arch_block_interrupts();
while (!ao_fifo_empty(ao_usart_tx_fifo))
ao_sleep(&ao_usart_tx_fifo);
ao_arch_release_interrupts();
}
void
ao_serial_set_speed(uint8_t speed)
{
if (speed > AO_SERIAL_SPEED_115200)
return;
#if 0
usart->reg->brr = ao_usart_speeds[speed].brr;
#endif
}
#include "ao_serial_lpc.h"
void
ao_serial_init(void)
{
/* Turn on the USART clock */
lpc_scb.uartclkdiv = 1;
#if SERIAL_0_18_19
lpc_ioconf.pio0_18 = ((LPC_IOCONF_FUNC_PIO0_18_RXD << LPC_IOCONF_FUNC) |
(LPC_IOCONF_MODE_INACTIVE << LPC_IOCONF_MODE) |
(0 << LPC_IOCONF_HYS) |
(0 << LPC_IOCONF_INV) |
(0 << LPC_IOCONF_OD));
lpc_ioconf.pio0_19 = ((LPC_IOCONF_FUNC_PIO0_19_TXD << LPC_IOCONF_FUNC) |
(LPC_IOCONF_MODE_INACTIVE << LPC_IOCONF_MODE) |
(0 << LPC_IOCONF_HYS) |
(0 << LPC_IOCONF_INV) |
(0 << LPC_IOCONF_OD));
#endif
/* Turn on the USART */
lpc_scb.sysahbclkctrl |= (1 << LPC_SCB_SYSAHBCLKCTRL_USART);
}
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