altos: Restructure altos build to prepare for multi-arch support

[fw/altos] / src / cc1111 / ao_serial.c

diff --git a/src/cc1111/ao_serial.c b/src/cc1111/ao_serial.c
new file mode 100644 (file)
index 0000000..82370c6
--- /dev/null
+++ b/src/cc1111/ao_serial.c
@@ -0,0 +1,175 @@
+/*
+ * 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 __code 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)
+{
+#if HAS_SERIAL_1_ALT_1
+       /* Set up the USART pin assignment */
+       PERCFG = (PERCFG & ~PERCFG_U1CFG_ALT_MASK) | PERCFG_U1CFG_ALT_1;
+
+       P2DIR = (P2DIR & ~P2DIR_PRIP0_MASK) | P2DIR_PRIP0_USART1_USART0;
+
+       /* Make the USART pins be controlled by the USART */
+       P0SEL |= (1 << 5) | (1 << 4);
+#if HAS_SERIAL_1_HW_FLOW
+       P0SEL |= (1 << 3) | (1 << 2);
+#endif
+#else
+       /* 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);
+       P1SEL |= (1 << 5) | (1 << 4);
+#endif
+
+       /* 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 |
+#if HAS_SERIAL_1_HW_FLOW
+                UxUCR_FLOW_ENABLE |
+#else
+                UxUCR_FLOW_DISABLE |
+#endif
+                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;
+}