X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=drv%2Ftwi.c;h=d0c6537428369569fd50cea491eeaf89dbf719ac;hb=7920ccf2c9be523f680d88ef7d681d09af7da209;hp=76d4a82f463c28c305c23913d6e45ef9c6922ac4;hpb=888d1c49ed7cea0f272f520a74be35a32032bd6e;p=bertos.git

diff --git a/drv/twi.c b/drv/twi.c
index 76d4a82f..d0c65374 100755
--- a/drv/twi.c
+++ b/drv/twi.c
@@ -1,4 +1,4 @@
-/*!
+/**
  * \file
  * <!--
  * Copyright 2003, 2004, 2005 Develer S.r.l. (http://www.develer.com/)
@@ -15,6 +15,12 @@
 
 /*#*
  *#* $Log$
+ *#* Revision 1.7  2006/07/19 12:56:26  bernie
+ *#* Convert to new Doxygen style.
+ *#*
+ *#* Revision 1.6  2006/03/20 17:49:50  bernie
+ *#* Make the TWI driver more generic to work with devices other than EEPROMS.
+ *#*
  *#* Revision 1.5  2005/11/27 23:33:40  bernie
  *#* Use appconfig.h instead of cfg/config.h.
  *#*
@@ -46,14 +52,10 @@
 /* Wait for TWINT flag set: bus is ready */
 #define WAIT_TWI_READY  do {} while (!(TWCR & BV(TWINT)))
 
-/*! \name EEPROM control codes */
-/*@{*/
-#define SLA_W  0xA0
-#define SLA_R  0xA1
-/*@}*/
+#define READ_BIT BV(0)
 
 
-/*!
+/**
  * Send START condition on the bus.
  *
  * \return true on success, false otherwise.
@@ -71,15 +73,15 @@ static bool twi_start(void)
 }
 
 
-/*!
+/**
  * Send START condition and select slave for write.
+ * \c id is the device id comprehensive of address left shifted by 1.
+ * The LSB of \c id is ignored and reset to 0 for write operation.
  *
  * \return true on success, false otherwise.
  */
-bool twi_start_w(uint8_t slave_addr)
+bool twi_start_w(uint8_t id)
 {
-	ASSERT(slave_addr < 8);
-
 	/*
 	 * Loop on the select write sequence: when the eeprom is busy
 	 * writing previously sent data it will reply to the SLA_W
@@ -88,7 +90,7 @@ bool twi_start_w(uint8_t slave_addr)
 	 */
 	while (twi_start())
 	{
-		TWDR = SLA_W | (slave_addr << 1);
+		TWDR = id & ~READ_BIT;
 		TWCR = BV(TWINT) | BV(TWEN);
 		WAIT_TWI_READY;
 
@@ -105,18 +107,18 @@ bool twi_start_w(uint8_t slave_addr)
 }
 
 
-/*!
+/**
  * Send START condition and select slave for read.
+ * \c id is the device id comprehensive of address left shifted by 1.
+ * The LSB of \c id is ignored and set to 1 for read operation.
  *
  * \return true on success, false otherwise.
  */
-bool twi_start_r(uint8_t slave_addr)
+bool twi_start_r(uint8_t id)
 {
-	ASSERT(slave_addr < 8);
-
 	if (twi_start())
 	{
-		TWDR = SLA_R | (slave_addr << 1);
+		TWDR = id | READ_BIT;
 		TWCR = BV(TWINT) | BV(TWEN);
 		WAIT_TWI_READY;
 
@@ -130,16 +132,36 @@ bool twi_start_r(uint8_t slave_addr)
 }
 
 
-/*!
+/**
  * Send STOP condition.
  */
 void twi_stop(void)
 {
-	TWCR = BV(TWINT) | BV(TWEN) | BV(TWSTO);
+        TWCR = BV(TWINT) | BV(TWEN) | BV(TWSTO);
 }
 
 
-/*!
+/**
+ * Put a single byte in master transmitter mode
+ * to the selected slave device through the TWI bus.
+ *
+ * \return true on success, false on error.
+ */
+bool twi_put(const uint8_t data)
+{
+	TWDR = data;
+	TWCR = BV(TWINT) | BV(TWEN);
+	WAIT_TWI_READY;
+	if (TW_STATUS != TW_MT_DATA_ACK)
+	{
+		kprintf("!TW_MT_DATA_ACK: %x\n", TWSR);
+		return false;
+	}
+	return true;
+}
+
+
+/**
  * Send a sequence of bytes in master transmitter mode
  * to the selected slave device through the TWI bus.
  *
@@ -151,21 +173,14 @@ bool twi_send(const void *_buf, size_t count)
 
 	while (count--)
 	{
-		TWDR = *buf++;
-		TWCR = BV(TWINT) | BV(TWEN);
-		WAIT_TWI_READY;
-		if (TW_STATUS != TW_MT_DATA_ACK)
-		{
-			kprintf("!TW_MT_DATA_ACK: %x\n", TWSR);
+		if (!twi_put(*buf++))
 			return false;
-		}
 	}
-
 	return true;
 }
 
 
-/*!
+/**
  * Receive a sequence of one or more bytes from the
  * selected slave device in master receive mode through
  * the TWI bus.
@@ -210,7 +225,7 @@ bool twi_recv(void *_buf, size_t count)
 }
 
 
-/*!
+/**
  * Initialize TWI module.
  */
 void twi_init(void)