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-rw-r--r--digital/dev2/src/common/gpio.c172
-rw-r--r--digital/dev2/src/common/gpio_proto.h57
2 files changed, 213 insertions, 16 deletions
diff --git a/digital/dev2/src/common/gpio.c b/digital/dev2/src/common/gpio.c
index 53cd8eda..b40b5ad7 100644
--- a/digital/dev2/src/common/gpio.c
+++ b/digital/dev2/src/common/gpio.c
@@ -26,15 +26,37 @@
#include "io.h"
#include "gpio.h"
+#include "gpio_proto.h"
#include "descriptors.h"
#include "modules/usb/usb.h"
+#include "modules/utils/utils.h"
+
+/* Context. */
+struct gpio_t
+{
+ /* Whether binary mode is activated. */
+ uint8_t bin;
+ /* Currently handled operation, or 0 if none. */
+ uint8_t op;
+ /* Arguments being received. */
+ uint8_t args[5];
+ /* Number of arguments to receive. */
+ uint8_t args_nb;
+ /* Number of received arguments. */
+ uint8_t args_index;
+ /* Data was sent on TX endpoint, need ZLP or last packet finalisation. */
+ uint8_t data_sent;
+};
+
+static struct gpio_t ctx;
void
gpio_init (void)
{
PORTD = 0;
DDRD = 0;
+ ctx.bin = 0;
}
void
@@ -43,31 +65,149 @@ gpio_uninit (void)
gpio_init ();
}
+static void
+gpio_bin_send (uint8_t c)
+{
+ Endpoint_SelectEndpoint (GPIO_TX_EPNUM);
+ while (!Endpoint_ReadWriteAllowed ())
+ ;
+ Endpoint_Write_Byte (c);
+ if (!Endpoint_ReadWriteAllowed ())
+ Endpoint_ClearCurrentBank ();
+ Endpoint_SelectEndpoint (GPIO_RX_EPNUM);
+ ctx.data_sent = 1;
+}
+
+static void
+gpio_bin_accept (uint8_t c)
+{
+ if (!ctx.op)
+ {
+ uint8_t op_args[][2] = {
+ { GPIO_OP_RESET_SYNC, 0 },
+ { GPIO_OP_SETUP, 5 },
+ { GPIO_OP_DIR, 1 },
+ { GPIO_OP_DIR_OUT, 1 },
+ { GPIO_OP_DIR_IN, 1 },
+ { GPIO_OP_OUT, 1 },
+ { GPIO_OP_OUT_SET, 1 },
+ { GPIO_OP_OUT_RESET, 1 },
+ { GPIO_OP_OUT_TOGGLE, 1 },
+ { GPIO_OP_OUT_CHANGE, 2 },
+ { GPIO_OP_IN, 0 },
+ };
+ uint8_t i;
+ ctx.op = 0;
+ ctx.args_nb = 0;
+ ctx.args_index = 0;
+ for (i = 0; i < UTILS_COUNT (op_args); i++)
+ {
+ if (op_args[i][0] == c)
+ {
+ ctx.op = c;
+ ctx.args_nb = op_args[i][1];
+ break;
+ }
+ }
+ }
+ else
+ {
+ ctx.args[ctx.args_index++] = c;
+ }
+ if (ctx.op && ctx.args_index == ctx.args_nb)
+ {
+ switch (ctx.op)
+ {
+ case GPIO_OP_RESET_SYNC:
+ PORTD = 0;
+ DDRD = 0;
+ break;
+ case GPIO_OP_SETUP:
+ /* Ignore arguments for the moment. */
+ break;
+ case GPIO_OP_DIR:
+ DDRD = ctx.args[0];
+ break;
+ case GPIO_OP_DIR_OUT:
+ DDRD |= ctx.args[0];
+ break;
+ case GPIO_OP_DIR_IN:
+ DDRD &= ~ctx.args[0];
+ break;
+ case GPIO_OP_OUT:
+ PORTD = ctx.args[0];
+ break;
+ case GPIO_OP_OUT_SET:
+ PORTD |= ctx.args[0];
+ break;
+ case GPIO_OP_OUT_RESET:
+ PORTD &= ~ctx.args[0];
+ break;
+ case GPIO_OP_OUT_TOGGLE:
+ PORTD ^= ctx.args[0];
+ break;
+ case GPIO_OP_OUT_CHANGE:
+ PORTD = (PORTD & ~ctx.args[0]) | ctx.args[1];
+ break;
+ case GPIO_OP_IN:
+ gpio_bin_send (PIND);
+ break;
+ }
+ ctx.op = 0;
+ }
+}
+
void
gpio_task (void)
{
- Endpoint_SelectEndpoint (GPIO_RX_EPNUM);
- /* If data is available from USB: */
- if (Endpoint_ReadWriteAllowed ())
+ if (!ctx.bin)
{
- /* Read as much as possible, and clear endpoint. */
- do {
- Endpoint_Discard_Byte ();
- } while (Endpoint_ReadWriteAllowed ());
- Endpoint_ClearCurrentBank ();
- /* Now, print current GPIO state if possible. */
- Endpoint_SelectEndpoint (GPIO_TX_EPNUM);
+ Endpoint_SelectEndpoint (GPIO_RX_EPNUM);
+ /* If data is available from USB: */
if (Endpoint_ReadWriteAllowed ())
{
- uint8_t i, pin;
- pin = PIND;
- for (i = 0; i < 8; i++)
+ /* Read as much as possible, and clear endpoint. */
+ do {
+ uint8_t c = Endpoint_Read_Byte ();
+ if (c == GPIO_OP_RESET_SYNC)
+ {
+ ctx.bin = 1;
+ gpio_task ();
+ return;
+ }
+ } while (Endpoint_ReadWriteAllowed ());
+ Endpoint_ClearCurrentBank ();
+ /* Now, print current GPIO state if possible. */
+ Endpoint_SelectEndpoint (GPIO_TX_EPNUM);
+ if (Endpoint_ReadWriteAllowed ())
{
- Endpoint_Write_Byte (pin & 0x80 ? '1' : '0');
- pin <<= 1;
+ uint8_t i, pin;
+ pin = PIND;
+ for (i = 0; i < 8; i++)
+ {
+ Endpoint_Write_Byte (pin & 0x80 ? '1' : '0');
+ pin <<= 1;
+ }
+ Endpoint_Write_Byte ('\r');
+ Endpoint_ClearCurrentBank ();
}
- Endpoint_Write_Byte ('\r');
+ }
+ }
+ else
+ {
+ Endpoint_SelectEndpoint (GPIO_RX_EPNUM);
+ if (Endpoint_ReadWriteAllowed ())
+ {
+ do {
+ gpio_bin_accept (Endpoint_Read_Byte ());
+ } while (Endpoint_ReadWriteAllowed ());
+ Endpoint_ClearCurrentBank ();
+ }
+ if (ctx.data_sent)
+ {
+ Endpoint_SelectEndpoint (GPIO_TX_EPNUM);
Endpoint_ClearCurrentBank ();
+ ctx.data_sent = 0;
}
}
}
diff --git a/digital/dev2/src/common/gpio_proto.h b/digital/dev2/src/common/gpio_proto.h
new file mode 100644
index 00000000..5252480e
--- /dev/null
+++ b/digital/dev2/src/common/gpio_proto.h
@@ -0,0 +1,57 @@
+#ifndef gpio_proto_h
+#define gpio_proto_h
+/* gpio_proto.h */
+/* dev2 - Multi-purpose development board using USB and Ethernet. {{{
+ *
+ * Copyright (C) 2013 Nicolas Schodet
+ *
+ * APBTeam:
+ * Web: http://apbteam.org/
+ * Email: team AT apbteam DOT org
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * }}} */
+
+/* All communications are big endian. */
+
+/* Reset communication and set all pins as input. */
+#define GPIO_OP_RESET_SYNC 0xa5
+/* Set port width (1 byte argument) and period (4 bytes, in ns unit).
+ * Port width will determine the size of a port argument (1 byte for 8, 2
+ * bytes for 16...). Period is the pause between two output changes, 0 means
+ * as fast as possible. */
+#define GPIO_OP_SETUP 0xaa
+
+/* Set complete port direction, 1 is output. */
+#define GPIO_OP_DIR 0xb0
+/* Set direction as output for selected pins. */
+#define GPIO_OP_DIR_OUT 0xb1
+/* Set direction as input for selected pins. */
+#define GPIO_OP_DIR_IN 0xb2
+/* Set complete output port value. */
+#define GPIO_OP_OUT 0xb4
+/* Set pins in output port. */
+#define GPIO_OP_OUT_SET 0xb5
+/* Reset pins in output port. */
+#define GPIO_OP_OUT_RESET 0xb6
+/* Toggle pins in output port. */
+#define GPIO_OP_OUT_TOGGLE 0xb7
+/* Change pins (mask as first argument, value as second argument). */
+#define GPIO_OP_OUT_CHANGE 0xb8
+/* Request port input. */
+#define GPIO_OP_IN 0xb9
+
+#endif /* gpio_proto_h */