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/*
* Copyright © 2009 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"
volatile __xdata struct ao_fifo ao_usart1_rx_fifo;
volatile __xdata struct ao_fifo ao_usart1_tx_fifo;
void
ao_serial_rx1_isr(void) __interrupt 3
{
if (!ao_fifo_full(ao_usart1_rx_fifo))
ao_fifo_insert(ao_usart1_rx_fifo, U1DBUF);
ao_wakeup(&ao_usart1_rx_fifo);
#if USE_SERIAL_STDIN
ao_wakeup(&ao_stdin_ready);
#endif
}
static __xdata uint8_t ao_serial_tx1_started;
static void
ao_serial_tx1_start(void)
{
if (!ao_fifo_empty(ao_usart1_tx_fifo) &&
!ao_serial_tx1_started)
{
ao_serial_tx1_started = 1;
ao_fifo_remove(ao_usart1_tx_fifo, U1DBUF);
}
}
void
ao_serial_tx1_isr(void) __interrupt 14
{
UTX1IF = 0;
ao_serial_tx1_started = 0;
ao_serial_tx1_start();
ao_wakeup(&ao_usart1_tx_fifo);
}
char
ao_serial_getchar(void) __critical
{
char c;
while (ao_fifo_empty(ao_usart1_rx_fifo))
ao_sleep(&ao_usart1_rx_fifo);
ao_fifo_remove(ao_usart1_rx_fifo, c);
return c;
}
#if USE_SERIAL_STDIN
char
ao_serial_pollchar(void) __critical
{
char c;
if (ao_fifo_empty(ao_usart1_rx_fifo))
return AO_READ_AGAIN;
ao_fifo_remove(ao_usart1_rx_fifo,c);
return c;
}
#endif
void
ao_serial_putchar(char c) __critical
{
while (ao_fifo_full(ao_usart1_tx_fifo))
ao_sleep(&ao_usart1_tx_fifo);
ao_fifo_insert(ao_usart1_tx_fifo, c);
ao_serial_tx1_start();
}
void
ao_serial_drain(void) __critical
{
while (!ao_fifo_empty(ao_usart1_tx_fifo))
ao_sleep(&ao_usart1_tx_fifo);
}
static const struct {
uint8_t baud;
uint8_t gcr;
} ao_serial_speeds[] = {
/* [AO_SERIAL_SPEED_4800] = */ {
/* .baud = */ 163,
/* .gcr = */ (7 << UxGCR_BAUD_E_SHIFT) | UxGCR_ORDER_LSB
},
/* [AO_SERIAL_SPEED_9600] = */ {
/* .baud = */ 163,
/* .gcr = */ (8 << UxGCR_BAUD_E_SHIFT) | UxGCR_ORDER_LSB
},
/* [AO_SERIAL_SPEED_19200] = */ {
/* .baud = */ 163,
/* .gcr = */ (9 << UxGCR_BAUD_E_SHIFT) | UxGCR_ORDER_LSB
},
/* [AO_SERIAL_SPEED_57600] = */ {
/* .baud = */ 59,
/* .gcr = */ (11 << UxGCR_BAUD_E_SHIFT) | UxGCR_ORDER_LSB
},
};
void
ao_serial_set_speed(uint8_t speed)
{
ao_serial_drain();
if (speed > AO_SERIAL_SPEED_57600)
return;
U1UCR |= UxUCR_FLUSH;
U1BAUD = ao_serial_speeds[speed].baud;
U1GCR = ao_serial_speeds[speed].gcr;
}
void
ao_serial_init(void)
{
/* Set up the USART pin assignment */
PERCFG = (PERCFG & ~PERCFG_U1CFG_ALT_MASK) | PERCFG_U1CFG_ALT_2;
P2SEL = (P2SEL & ~(P2SEL_PRI3P1_MASK | P2SEL_PRI2P1_MASK)) |
(P2SEL_PRI3P1_USART1 | P2SEL_PRI2P1_USART1);
/* Make the USART pins be controlled by the USART */
P1SEL |= (1 << 6) | (1 << 7);
/* UART mode with receiver enabled */
U1CSR = (UxCSR_MODE_UART | UxCSR_RE);
/* Pick a 4800 baud rate */
ao_serial_set_speed(AO_SERIAL_SPEED_4800);
/* Reasonable serial parameters */
U1UCR = (UxUCR_FLUSH |
UxUCR_FLOW_DISABLE |
UxUCR_D9_EVEN_PARITY |
UxUCR_BIT9_8_BITS |
UxUCR_PARITY_DISABLE |
UxUCR_SPB_1_STOP_BIT |
UxUCR_STOP_HIGH |
UxUCR_START_LOW);
IEN0 |= IEN0_URX1IE;
IEN2 |= IEN2_UTX1IE;
}
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