From 324c5ba9098c1010d0aa8c1e26b95509878ce9f2 Mon Sep 17 00:00:00 2001
From: Yves Fischer <yvesf-git@xapek.org>
Date: Tue, 11 Oct 2011 21:50:49 +0200
Subject: Mini-Octopus build from r@171

---
 firmware/spi.c | 188 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 188 insertions(+)
 create mode 100644 firmware/spi.c

(limited to 'firmware/spi.c')

diff --git a/firmware/spi.c b/firmware/spi.c
new file mode 100644
index 0000000..2b8abb1
--- /dev/null
+++ b/firmware/spi.c
@@ -0,0 +1,188 @@
+/*
+ * Author: Benedikt Sauter <sauter@ixbat.de>
+ * All rights reserved.
+ *
+ * Short descripton of file:
+ *
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions 
+ * are met:
+ *
+ *   * Redistributions of source code must retain the above copyright 
+ *     notice, this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above 
+ *     copyright notice, this list of conditions and the following 
+ *     disclaimer in the documentation and/or other materials provided 
+ *     with the distribution.
+ *   * Neither the name of the FH Augsburg nor the names of its 
+ *     contributors may be used to endorse or promote products derived 
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include "common.h"
+#include "protocol.h"
+
+#include "spi.h"
+
+void spi_parser(char *buf)
+{
+  switch(buf[0]) {
+    case CMD_SPI_INIT:
+      spi_init_usb();
+    break;
+    case CMD_SPI_DEINIT:
+      spi_deinit_usb();
+    break;
+    case CMD_SPI_SPEED:
+      spi_set_speed_usb((int)buf[2]);
+    break;
+    case CMD_SPI_SEND:
+      spi_send_usb(&buf[2], (int)buf[1]);
+    break;
+    case CMD_SPI_RECV:
+      spi_receive_usb((int)buf[1]);
+    case CMD_SPI_SEND_AND_RECV:
+      spi_send_and_receive_usb(&buf[2], (int)buf[1]);
+    break;
+    default:
+      answer[0] = buf[0];
+      answer[1] = RSP_UNKOWN_CMD;
+      answer[2] = 0;
+      CommandAnswer(3);
+  }
+}
+
+void spi_init_usb(void)
+{
+  answer[0] = CMD_SPI_INIT;
+  answer[1] = (unsigned char) spi_init();
+  answer[3] = 0;
+  CommandAnswer(3);
+}
+
+
+int spi_init(void)
+{
+  PORTB   &=  ~((1 << SCK)|(1<<MISO)|(1<<MOSI));  // SCK have to be low in IDLE
+  DDRB &=~(1 << MISO);
+  DDRB = (1 << MOSI)|(1 << SCK); 
+
+  SPCR = 0;
+  SPSR = 0;
+
+  SPCR = (1<<SPE)|(1<<MSTR)|(1<<SPR0)|(1<<SPR1);
+
+  octopus.ports[5]=PIN_SCK;
+  octopus.ports[6]=PIN_MOSI;
+  octopus.ports[7]=PIN_MISO;
+
+  return RSP_OK;
+}
+
+void spi_deinit_usb(void)
+{
+  answer[0]=CMD_SPI_DEINIT;
+  answer[1]=(unsigned char)spi_deinit();
+  answer[2]=0;
+  CommandAnswer(3);
+}
+
+int spi_deinit(void)
+{
+  SPCR = 0;
+  SPSR = 0;
+
+  octopus.ports[5]=PIN_OUT;  // this is wrong!
+  octopus.ports[6]=PIN_OUT;  // this is wrong!
+  octopus.ports[7]=PIN_OUT;  // this is wrong!
+
+  return RSP_OK;
+}
+
+void spi_set_speed_usb(int speed){
+
+}
+
+int spi_set_speed(int speed){
+
+  return RSP_OK;
+}
+
+void spi_send_usb(char * buf, int length)
+{
+  answer[0]=CMD_SPI_SEND;
+  answer[1]=(unsigned char)spi_send(buf,length);
+  answer[2]=0;
+  CommandAnswer(3);
+}
+
+int spi_send(char * buf, int length)
+{
+  int i;
+  for(i=0;i<length;i++){
+    SPDR = buf[i];
+    while ( !(SPSR & (1 << SPIF)) ) ;
+  }
+  return RSP_OK;
+}
+
+
+void spi_receive_usb(int length)
+{
+  answer[0]=CMD_SPI_RECV;
+  answer[1]=(unsigned char)spi_receive((char*)&answer[2],length);
+  answer[2]=0;
+  CommandAnswer(length+2);
+}
+
+
+unsigned char spi_receive( char * buf, int length)
+{
+  int i;
+  int timeout = 0;
+  for(i=0;i<length;i++){
+    SPDR = 0;
+    while(!(SPSR & (1 << SPIF))) { timeout++; if( timeout > 1000) return RSP_TIMEOUT; }
+    buf[i]=SPDR;
+  }
+  return RSP_OK;
+}
+
+void spi_send_and_receive_usb(char * txbuf, int length)
+{
+  answer[0]=CMD_SPI_SEND;
+  answer[1]=(unsigned char)spi_send_and_receive(txbuf,(char *)&answer[2],length);
+  answer[2]=0;
+  CommandAnswer(2+length);
+
+}
+
+int spi_send_and_receive(char * txbuf, char * rxbuf, int length){
+
+  int i, timeout=0;
+  for(i=0;i<length;i++){
+    SPDR = txbuf[i];
+    //while ( !(SPSR & (1 << SPIF)) ) ;
+    while(!(SPSR & (1 << SPIF))) { timeout++; if( timeout > 1000) return RSP_TIMEOUT; }
+    rxbuf[i]=SPDR;
+  }
+  return RSP_OK;
+}
+
+
+
+
+
+
-- 
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