X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=bertos%2Fdrv%2Fsipo.c;h=a1e88ab5783d1839855575b48462c973a9af1429;hb=cd442d4c29789100518394a055d52261e4cbd36f;hp=cb821692727b4989a57227b77ae87565a39435f8;hpb=2aa5b04dcc5daad2409bf2027541704b56a85f13;p=bertos.git

diff --git a/bertos/drv/sipo.c b/bertos/drv/sipo.c
index cb821692..a1e88ab5 100644
--- a/bertos/drv/sipo.c
+++ b/bertos/drv/sipo.c
@@ -26,7 +26,7 @@
  * invalidate any other reasons why the executable file might be covered by
  * the GNU General Public License.
  *
- * Copyright 2008 Develer S.r.l. (http://www.develer.com/)
+ * Copyright 2009 Develer S.r.l. (http://www.develer.com/)
  *
  * -->
  *
@@ -34,10 +34,10 @@
  *
  * \brief SIPO Module
  *
- * The SIPO module trasform a serial input in
- * a parallel output. Please check hw_sipo.h
- * file to customize hardware relative parameters.
+ * 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>
  * \author Daniele Basile <asterix@develer.com>
  */
 
@@ -46,43 +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 sipo register and when finish to
- * we load it.
+ * 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);
 
-	// Load into shift register all byte in buffer
+	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 finsh to load bytes into shift register, load it.
-	SIPO_LOAD();
+	// We finsh to load bytes, so load it.
+	SIPO_LOAD(fd->load_device, fd->load_pol);
 
 	return write_len;
 }
@@ -99,9 +113,11 @@ void sipo_init(Sipo *fd)
 	//Set kfile struct type as a generic kfile structure.
 	DB(fd->fd._type = KFT_SIPO);
 
-	// Set up data flash programming functions.
+	// Set up SIPO writing functions.
 	fd->fd.write = sipo_write;
 
 	SIPO_INIT_PIN();
 
+	/* Enable sipo output */
+	SIPO_ENABLE();
 }