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-rw-r--r--digital/avr/modules/twi/Makefile.module2
-rw-r--r--digital/avr/modules/twi/test/soft/Makefile14
-rw-r--r--digital/avr/modules/twi/test/soft/avrconfig.h107
-rw-r--r--digital/avr/modules/twi/twi_soft.avr.c240
4 files changed, 362 insertions, 1 deletions
diff --git a/digital/avr/modules/twi/Makefile.module b/digital/avr/modules/twi/Makefile.module
index 3508cf4f..136203a9 100644
--- a/digital/avr/modules/twi/Makefile.module
+++ b/digital/avr/modules/twi/Makefile.module
@@ -1 +1 @@
-twi_SOURCES = twi.c twi_hard.avr.c twi.host.c
+twi_SOURCES = twi.c twi_hard.avr.c twi_soft.avr.c twi.host.c
diff --git a/digital/avr/modules/twi/test/soft/Makefile b/digital/avr/modules/twi/test/soft/Makefile
new file mode 100644
index 00000000..68b9da2c
--- /dev/null
+++ b/digital/avr/modules/twi/test/soft/Makefile
@@ -0,0 +1,14 @@
+BASE = ../../../..
+AVR_PROGS = test_twi_soft
+test_twi_soft_SOURCES = test_twi.c
+MODULES = twi uart proto math/random utils
+CONFIGFILE = avrconfig.h
+# atmega8, atmega8535, atmega128...
+AVR_MCU = atmega128
+# -O2 : speed
+# -Os : size
+OPTIMIZE = -Os
+
+vpath %.c ..
+
+include $(BASE)/make/Makefile.gen
diff --git a/digital/avr/modules/twi/test/soft/avrconfig.h b/digital/avr/modules/twi/test/soft/avrconfig.h
new file mode 100644
index 00000000..4a802a6d
--- /dev/null
+++ b/digital/avr/modules/twi/test/soft/avrconfig.h
@@ -0,0 +1,107 @@
+#ifndef avrconfig_h
+#define avrconfig_h
+/* avrconfig.h */
+/* avr.twi - TWI AVR module. {{{
+ *
+ * Copyright (C) 2010 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.
+ *
+ * }}} */
+
+/* utils */
+/** AVR Frequency : 1000000, 1843200, 2000000, 3686400, 4000000, 7372800,
+ * 8000000, 11059200, 14745600, 16000000, 18432000, 20000000. */
+#define AC_FREQ 14745600
+
+/* uart - UART module. */
+/** Select hardware uart for primary uart: 0, 1 or -1 to disable. */
+#define AC_UART0_PORT 1
+/** Baudrate: 2400, 4800, 9600, 14400, 19200, 28800, 38400, 57600, 76800,
+ * 115200, 230400, 250000, 500000, 1000000. */
+#define AC_UART0_BAUDRATE 38400
+/** Send mode:
+ * - POLLING: no interrupts.
+ * - RING: interrupts, ring buffer. */
+#define AC_UART0_SEND_MODE RING
+/** Recv mode, same as send mode. */
+#define AC_UART0_RECV_MODE RING
+/** Character size: 5, 6, 7, 8, 9 (only 8 implemented). */
+#define AC_UART0_CHAR_SIZE 8
+/** Parity : ODD, EVEN, NONE. */
+#define AC_UART0_PARITY EVEN
+/** Stop bits : 1, 2. */
+#define AC_UART0_STOP_BITS 1
+/** Send buffer size, should be power of 2 for RING mode. */
+#define AC_UART0_SEND_BUFFER_SIZE 32
+/** Recv buffer size, should be power of 2 for RING mode. */
+#define AC_UART0_RECV_BUFFER_SIZE 32
+/** If the send buffer is full when putc:
+ * - DROP: drop the new byte.
+ * - WAIT: wait until there is room in the send buffer. */
+#define AC_UART0_SEND_BUFFER_FULL WAIT
+/** In HOST compilation:
+ * - STDIO: use stdin/out.
+ * - PTS: use pseudo terminal. */
+#define AC_UART0_HOST_DRIVER STDIO
+/** Same thing for secondary port. */
+#define AC_UART1_PORT -1
+#define AC_UART1_BAUDRATE 115200
+#define AC_UART1_SEND_MODE RING
+#define AC_UART1_RECV_MODE RING
+#define AC_UART1_CHAR_SIZE 8
+#define AC_UART1_PARITY EVEN
+#define AC_UART1_STOP_BITS 1
+#define AC_UART1_SEND_BUFFER_SIZE 32
+#define AC_UART1_RECV_BUFFER_SIZE 32
+#define AC_UART1_SEND_BUFFER_FULL WAIT
+#define AC_UART1_HOST_DRIVER PTS
+
+/* proto - Protocol module. */
+/** Maximum argument size. */
+#define AC_PROTO_ARGS_MAX_SIZE 32
+/** Callback function name. */
+#define AC_PROTO_CALLBACK proto_callback
+/** Putchar function name. */
+#define AC_PROTO_PUTC uart0_putc
+/** Support for quote parameter. */
+#define AC_PROTO_QUOTE 1
+
+/* twi - TWI module. */
+/** Driver to implement TWI: HARD, SOFT, or USI. */
+#define AC_TWI_DRIVER SOFT
+/** Do not use interrupts. */
+#define AC_TWI_NO_INTERRUPT 0
+/** TWI frequency, should really be 100 kHz. */
+#define AC_TWI_FREQ 100000
+/** Enable slave part. */
+#define AC_TWI_SLAVE_ENABLE 0
+/** Enable master part. */
+#define AC_TWI_MASTER_ENABLE 1
+/** Master transfer completion callback, optionally defined by the user, called
+ * at end of master transfer. */
+#undef AC_TWI_MASTER_DONE
+/** Use internal pull up. */
+#define AC_TWI_PULL_UP 0
+/** SDA line IO for SOFT driver. */
+#define AC_TWI_SOFT_SDA_IO D, 1
+/** SCL line IO for SOFT driver. */
+#define AC_TWI_SOFT_SCL_IO D, 0
+
+#endif /* avrconfig_h */
diff --git a/digital/avr/modules/twi/twi_soft.avr.c b/digital/avr/modules/twi/twi_soft.avr.c
new file mode 100644
index 00000000..b673d5be
--- /dev/null
+++ b/digital/avr/modules/twi/twi_soft.avr.c
@@ -0,0 +1,240 @@
+/* twi_soft.avr.c - Software master implementation. */
+/* avr.twi - TWI AVR module. {{{
+ *
+ * Copyright (C) 2010 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.
+ *
+ * }}} */
+#include "common.h"
+#include "twi.h"
+
+#if TWI_DRIVER == TWI_DRIVER_SOFT
+
+# include "modules/utils/utils.h"
+# include "io.h"
+
+# if AC_TWI_SLAVE_ENABLE
+# error "twi: slave mode not supported by software driver"
+# endif
+# if AC_TWI_NO_INTERRUPT
+# warning "twi: no interrupt anyway"
+# endif
+
+/* Define IO shortcuts. */
+# define SDA_IO AC_TWI_SOFT_SDA_IO
+# define SCL_IO AC_TWI_SOFT_SCL_IO
+
+# if AC_TWI_PULL_UP
+# define SDA_0 do { IO_CLR (SDA_IO); IO_OUTPUT (SDA_IO); } while (0)
+# define SDA_1 do { IO_INPUT (SDA_IO); IO_SET (SDA_IO); } while (0)
+# define SCL_0 do { IO_CLR (SCL_IO); IO_OUTPUT (SCL_IO); } while (0)
+# define SCL_1 do { IO_INPUT (SCL_IO); IO_SET (SCL_IO); } while (0)
+# else
+# define SDA_0 do { IO_OUTPUT (SDA_IO); } while (0)
+# define SDA_1 do { IO_INPUT (SDA_IO); } while (0)
+# define SCL_0 do { IO_OUTPUT (SCL_IO); } while (0)
+# define SCL_1 do { IO_INPUT (SCL_IO); } while (0)
+# endif
+
+# if AC_TWI_MASTER_ENABLE
+
+/** Current master status. */
+uint8_t twi_master_current_status;
+
+# endif
+
+void
+twi_init (uint8_t addr)
+{
+#if AC_TWI_PULL_UP
+ SDA_1;
+ SCL_1;
+#else
+ IO_CLR (SDA_IO);
+ SDA_1;
+ IO_CLR (SCL_IO);
+ SCL_1;
+#endif
+}
+
+void
+twi_uninit (void)
+{
+ /* Keep pull-up. */
+}
+
+# if AC_TWI_MASTER_ENABLE
+
+/** Wait a half bit period. */
+static void
+twi_delay (void)
+{
+ utils_delay (0.5 / AC_TWI_FREQ);
+}
+
+/** Wait until SCL is high to enable clock stretching. */
+static inline void
+twi_wait_scl (void)
+{
+ while (!IO_GET (SCL_IO))
+ ;
+}
+
+/** Send start condition. */
+static void
+twi_master_send_start (void)
+{
+ SDA_0;
+ twi_delay ();
+ SCL_0;
+ twi_delay ();
+}
+
+/** Send stop condition. */
+static void
+twi_master_send_stop (void)
+{
+ SDA_0;
+ twi_delay ();
+ SCL_1;
+ twi_wait_scl ();
+ twi_delay ();
+ SDA_1;
+ twi_delay ();
+}
+
+/** Send one bit. */
+static void
+twi_master_send_bit (uint8_t bit)
+{
+ if (bit)
+ SDA_1;
+ else
+ SDA_0;
+ twi_delay ();
+ SCL_1;
+ twi_wait_scl ();
+ twi_delay ();
+ SCL_0;
+}
+
+/** Receive one bit. */
+static uint8_t
+twi_master_recv_bit (void)
+{
+ SDA_1;
+ twi_delay ();
+ SCL_1;
+ twi_wait_scl ();
+ uint8_t bit = IO_GET (SDA_IO) ? 1 : 0;
+ twi_delay ();
+ SCL_0;
+ return bit;
+}
+
+/** Send one byte, return the received nack bit. */
+static uint8_t
+twi_master_send_byte (uint8_t b)
+{
+ uint8_t i;
+ for (i = 8; i; i--)
+ {
+ twi_master_send_bit (b & 0x80);
+ b <<= 1;
+ }
+ return twi_master_recv_bit ();
+}
+
+/** Receive one byte, send the nack bit. */
+static uint8_t
+twi_master_recv_byte (uint8_t nack)
+{
+ uint8_t i, b;
+ b = 0;
+ for (i = 8; i; i--)
+ {
+ b <<= 1;
+ b |= twi_master_recv_bit ();
+ }
+ twi_master_send_bit (nack);
+ return b;
+}
+
+void
+twi_master_send (uint8_t addr, const uint8_t *buffer, uint8_t size)
+{
+ uint8_t nack, sent = 0;
+ /* Start. */
+ twi_master_send_start ();
+ /* Send SLA+W. */
+ nack = twi_master_send_byte (addr | 0);
+ /* Send data. */
+ for (; !nack && sent < size; sent++)
+ nack = twi_master_send_byte (buffer[sent]);
+ /* Stop. */
+ twi_master_send_stop ();
+ /* Update status, there is no background task. */
+ twi_master_current_status = sent;
+ /* If defined, call master done callback. */
+#ifdef AC_TWI_MASTER_DONE
+ AC_TWI_MASTER_DONE ();
+#endif
+}
+
+void
+twi_master_recv (uint8_t addr, uint8_t *buffer, uint8_t size)
+{
+ uint8_t nack, recv = 0;
+ /* Start. */
+ twi_master_send_start ();
+ /* Send SLA+R. */
+ nack = twi_master_send_byte (addr | 1);
+ if (!nack)
+ {
+ /* Receive data, send nack in last byte. */
+ for (; recv < size; recv++)
+ buffer[recv] = twi_master_recv_byte (recv == size - 1 ? 1 : 0);
+ }
+ /* Stop. */
+ twi_master_send_stop ();
+ /* Update status, there is no background task. */
+ twi_master_current_status = recv;
+ /* If defined, call master done callback. */
+#ifdef AC_TWI_MASTER_DONE
+ AC_TWI_MASTER_DONE ();
+#endif
+}
+
+uint8_t
+twi_master_status (void)
+{
+ return twi_master_current_status;
+}
+
+uint8_t
+twi_master_wait (void)
+{
+ /* No background task, nothing to wait. */
+ return twi_master_current_status;
+}
+
+# endif /* AC_TWI_MASTER_ENABLE */
+
+#endif /* TWI_DRIVER == TWI_DRIVER_SOFT */