From fbeff97d9230af12326c94e3875adf9438f16ed4 Mon Sep 17 00:00:00 2001
From: barthess <barthess@35acf78f-673a-0410-8e92-d51de3d6d3f4>
Date: Thu, 23 Jun 2011 18:05:20 +0000
Subject: [PATCH] I2C. Variables shared among I2C1 and I2C2 interrupt handlers
 moved to driver structure.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/i2c_dev@3070 35acf78f-673a-0410-8e92-d51de3d6d3f4
---
 os/hal/platforms/STM32/i2c_lld.c | 15 ++++++++-------
 os/hal/platforms/STM32/i2c_lld.h |  6 ++++--
 os/hal/src/i2c.c                 |  2 ++
 3 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/os/hal/platforms/STM32/i2c_lld.c b/os/hal/platforms/STM32/i2c_lld.c
index 729e14eb3..e59ef8d45 100644
--- a/os/hal/platforms/STM32/i2c_lld.c
+++ b/os/hal/platforms/STM32/i2c_lld.c
@@ -42,7 +42,8 @@ static uint32_t i2c_get_event(I2CDriver *i2cp){
 }
 
 static void i2c_serve_event_interrupt(I2CDriver *i2cp) {
-  static __IO uint8_t *txBuffp, *rxBuffp, *datap;
+#define txBuffp (i2cp->txBuffp)
+#define rxBuffp (i2cp->rxBuffp)
 
   I2C_TypeDef *dp = i2cp->id_i2c;
 
@@ -71,26 +72,24 @@ static void i2c_serve_event_interrupt(I2CDriver *i2cp) {
     }
     //Initialize the transmit buffer pointer
     txBuffp = (uint8_t*)i2cp->id_slave_config->txbuf;
-    datap = txBuffp;
-    txBuffp++;
     i2cp->txbytes--;
     /* If no further data to be sent, disable the I2C ITBUF in order to not have a TxE interrupt */
     if(i2cp->txbytes == 0) {
       dp->CR2 &= (uint16_t)~I2C_CR2_ITBUFEN;
     }
     //EV8_1 write the first data
-    dp->DR = *datap;
+    dp->DR = *txBuffp;
+    txBuffp++;
     break;
   case I2C_EV8_MASTER_BYTE_TRANSMITTING:
     if(i2cp->txbytes > 0) {
-      datap = txBuffp;
-      txBuffp++;
       i2cp->txbytes--;
       if(i2cp->txbytes == 0) {
         /* If no further data to be sent, disable the ITBUF in order to not have a TxE interrupt */
         dp->CR2 &= (uint16_t)~I2C_CR2_ITBUFEN;
       }
-      dp->DR = *datap;
+      dp->DR = *txBuffp;
+      txBuffp++;
     }
     break;
   case I2C_EV8_2_MASTER_BYTE_TRANSMITTED:
@@ -195,6 +194,8 @@ static void i2c_serve_event_interrupt(I2CDriver *i2cp) {
     }
     break;
   }
+#undef rxBuffp
+#undef txBuffp
 }
 
 static void i2c_serve_error_interrupt(I2CDriver *i2cp) {
diff --git a/os/hal/platforms/STM32/i2c_lld.h b/os/hal/platforms/STM32/i2c_lld.h
index c3df51b07..66ee95dd9 100644
--- a/os/hal/platforms/STM32/i2c_lld.h
+++ b/os/hal/platforms/STM32/i2c_lld.h
@@ -163,8 +163,10 @@ struct I2CDriver{
    */
   const I2CSlaveConfig  *id_slave_config;
 
-	size_t                txbytes;      /*!< Number of bytes to transmitted. */
-	size_t                rxbytes;      /*!< Number of bytes to received. */
+	size_t                txbytes;      /*!< Number of bytes to be transmitted. */
+	size_t                rxbytes;      /*!< Number of bytes to be received. */
+  uint8_t 							*rxBuffp;     /*!< Pointer to the current byte in slave rx buffer. */
+  uint8_t 							*txBuffp;     /*!< Pointer to the current byte in slave tx buffer. */
 
   i2cflags_t            errors;       /*!< Error flags.*/
   i2cflags_t            flags;        /*!< State flags.*/
diff --git a/os/hal/src/i2c.c b/os/hal/src/i2c.c
index 4e3f5e5b9..56e2f4484 100644
--- a/os/hal/src/i2c.c
+++ b/os/hal/src/i2c.c
@@ -69,6 +69,8 @@ void i2cObjectInit(I2CDriver *i2cp) {
 
   i2cp->id_state  = I2C_STOP;
   i2cp->id_config = NULL;
+  i2cp->rxBuffp = NULL;
+  i2cp->txBuffp = NULL;
   i2cp->id_slave_config = NULL;
 
 #if I2C_USE_WAIT