From 96a9c1585a17bce4abf3b393e1c307388878adbb Mon Sep 17 00:00:00 2001
From: asterix <asterix@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Wed, 3 Jun 2009 09:37:02 +0000
Subject: [PATCH] Generalize sipo module.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@2700 38d2e660-2303-0410-9eaa-f027e97ec537
---
 bertos/drv/sipo.c | 36 ++++++++++++++++++++++++----------
 bertos/drv/sipo.h | 50 ++++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 71 insertions(+), 15 deletions(-)

diff --git a/bertos/drv/sipo.c b/bertos/drv/sipo.c
index 44bbffe5..c3026274 100644
--- a/bertos/drv/sipo.c
+++ b/bertos/drv/sipo.c
@@ -34,8 +34,7 @@
  *
  * \brief SIPO Module
  *
- * The SIPO module transforms a serial input in
- * a parallel output. Please check hw_sipo.h
+ * The SIPO module transforms a serial input in a parallel output. Please check hw_sipo.h
  * file to customize hardware related parameters.
  *
  * \author Andrea Grandi <andrea@develer.com>
@@ -47,42 +46,57 @@
 #include "hw/hw_sipo.h"
 
 #include <cfg/compiler.h>
+#include <cfg/log.h>
 
 #include <kern/kfile.h>
 
 #include <string.h>
 
+
+#define SIPO_DATAORDER_START(order)          (order ? SIPO_DATAORDER_START_LSB : SIPO_DATAORDER_START_MSB)
+#define SIPO_DATAORDER_SHIFT(shift, order)   (order ?  ((shift) <<= 1) : ((shift) >>= 1))
+
 /**
  * Write a char in sipo shift register
  */
-INLINE void sipo_putchar(uint8_t c)
+INLINE void sipo_putchar(uint8_t c, uint8_t bit_order, uint8_t clock_pol)
 {
+	uint8_t shift = SIPO_DATAORDER_START(bit_order);
+
 	for(int i = 0; i < 8; i++)
 	{
-		if((c & BV(i)) == 0)
+		if((c & shift) == 0)
 			SIPO_SI_LOW();
 		else
 			SIPO_SI_HIGH();
 
-		SIPO_SI_CLOCK();
+		SIPO_SI_CLOCK(clock_pol);
+
+		SIPO_DATAORDER_SHIFT(shift, bit_order);
 	}
 }
 
 /**
  * Write a buffer into the sipo register and, when finished, give a load pulse.
  */
- static size_t sipo_write(UNUSED_ARG(struct KFile *, fd), const void *_buf, size_t size)
+ static size_t sipo_write(struct KFile *_fd, const void *_buf, size_t size)
 {
 	const uint8_t *buf = (const uint8_t *)_buf;
+	Sipo *fd = SIPO_CAST(_fd);
 	size_t write_len = size;
+
 	ASSERT(buf);
 
+	SIPO_SET_SI_LEVEL();
+	SIPO_SET_CLK_LEVEL(fd->clock_pol);
+	SIPO_SET_LD_LEVEL(fd->load_device, fd->load_pol);
+
 	// Load into the shift register all the buffer bytes
 	while(size--)
-		sipo_putchar(*buf++);
+		sipo_putchar(*buf++, fd->bit_order, fd->clock_pol);
 
-	// We have just finished to shift the bytes into the register, now load them.
-	SIPO_LOAD();
+	// We finsh to load bytes, so load it.
+	SIPO_LOAD(fd->load_device, fd->load_pol);
 
 	return write_len;
 }
@@ -96,7 +110,7 @@ void sipo_init(Sipo *fd)
 
 	memset(fd, 0, sizeof(Sipo));
 
-	//Set kfile struct type as a Sipo structure.
+	//Set kfile struct type as a generic kfile structure.
 	DB(fd->fd._type = KFT_SIPO);
 
 	// Set up SIPO writing functions.
@@ -104,4 +118,6 @@ void sipo_init(Sipo *fd)
 
 	SIPO_INIT_PIN();
 
+	/* Enable sipo output */
+	SIPO_ENABLE();
 }
diff --git a/bertos/drv/sipo.h b/bertos/drv/sipo.h
index be2c6c1b..940f8537 100644
--- a/bertos/drv/sipo.h
+++ b/bertos/drv/sipo.h
@@ -31,32 +31,72 @@
  * -->
  *
  * \brief Generic Serial-in, Parallel-out implementation (SIPO).
- * 
- * This module use kfile interface.
  *
  *
  * \version $Id$
  *
  * \author Andrea Grandi <andrea@develer.com>
  * \author Daniele Basile <asterix@develer.com>
- * 
+ *
  * $WIZ$ module_name = "sipo"
  * $WIZ$ module_depends = "kfile"
  * $WIZ$ module_hw = "bertos/hw/hw_sipo.h"
- * 
  */
 
+
+
+
+
 #ifndef DRV_SIPO_H
 #define DRV_SIPO_H
 
+#include "hw/hw_sipo.h"
+
 #include <kern/kfile.h>
 
+#define SIPO_DATAORDER_START_LSB        1
+#define SIPO_DATAORDER_START_MSB     0x80
+
+/**
+ * Define enum to set sipo data order.
+ */
+typedef enum SipoBitOrder
+{
+	SIPO_DATAORDER_MSB = 0,
+	SIPO_DATAORDER_LSB = 1
+} SipoBitOrder;
+
+/**
+ * Define enum to set the start level of clock.
+ */
+typedef enum SipoClockPol
+{
+	SIPO_START_LOW = 0,
+	SIPO_START_HIGH = 1
+
+} SipoClkPol;
+
+/**
+ * Define enum to set load signal level.
+ */
+typedef enum SipoLoadPol
+{
+	SIPO_LOW_TO_HIGH = 0,
+	SIPO_HIGH_TO_LOW = 1
+
+} SipoLoadPol;
+
 /**
  * Sipo KFile context structure.
  */
 typedef struct Sipo
 {
-	KFile fd;                       ///< File descriptor.
+	KFile fd;                 ///< File descriptor.
+	SipoMap load_device;      ///< Descriptor of the device that we want drive.
+	SipoLoadPol load_pol;     ///< Set polarity of load signal.
+	SipoClkPol clock_pol;     ///< Set polarity of data clock.
+	SipoBitOrder bit_order;   ///< Set the order of pushed bits in sipo.
+
 } Sipo;
 
 /**
-- 
2.25.1