lpc: Initial lpcxpresso bits

[fw/altos] / src / lpc / ao_serial_lpc.c

diff --git a/src/lpc/ao_serial_lpc.c b/src/lpc/ao_serial_lpc.c
new file mode 100644 (file)
index 0000000..e47f743
--- /dev/null
+++ b/src/lpc/ao_serial_lpc.c
@@ -0,0 +1,154 @@
+/*
+ * 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);
+}
+
+