sam3 i2c: change stop function name, and read before set is not needed.

Move set stop bit before reading a byte, and wait transfer bit complete
when reading last byte.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@4944 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/bertos/cpu/cortex-m3/drv/i2c_sam3.c b/bertos/cpu/cortex-m3/drv/i2c_sam3.c
index 23ebb3d2d7201133bf764c544392b5351c1f271a..bdd0b5ce67d04e4bb608b3d1f8a8238edd2f4219 100644 (file)
--- a/bertos/cpu/cortex-m3/drv/i2c_sam3.c
+++ b/bertos/cpu/cortex-m3/drv/i2c_sam3.c
@@ -99,11 +99,11 @@ INLINE void waitXferComplete(I2c *i2c)
 }
 
 /*
- * Send STOP condition.
+ * Set STOP condition bit, to send stop after next sent byte.
  */
-INLINE void sendStop(I2c *i2c)
+INLINE void setStop(I2c *i2c)
 {
-       HWREG(i2c->hw->base + TWI_CR_OFF) |= TWI_CR_STOP;
+       HWREG(i2c->hw->base + TWI_CR_OFF) = TWI_CR_STOP;
 }
 
 /*
@@ -142,7 +142,7 @@ static void i2c_sam3_putc(I2c *i2c, const uint8_t data)
        {
                LOG_ERR("i2c: write start timeout\n");
                i2c->errors |= I2C_START_TIMEOUT;
-               sendStop(i2c);
+               setStop(i2c);
                waitXferComplete(i2c);
                return;
        }
@@ -150,22 +150,24 @@ static void i2c_sam3_putc(I2c *i2c, const uint8_t data)
 
        if ((i2c->xfer_size == 1) && (I2C_TEST_STOP(i2c->flags) == I2C_STOP))
        {
-               sendStop(i2c);
+               setStop(i2c);
                waitXferComplete(i2c);
        }
 }
 
 static uint8_t i2c_sam3_getc(I2c *i2c)
 {
+       uint8_t data;
+
+       if ((i2c->xfer_size == 1) && (I2C_TEST_STOP(i2c->flags) == I2C_STOP))
+               setStop(i2c);
+
        if (i2c->hw->first_xtranf)
        {
                HWREG(i2c->hw->base + TWI_CR_OFF) = TWI_CR_START;
                i2c->hw->first_xtranf = false;
        }
 
-       if ((i2c->xfer_size == 1) && (I2C_TEST_STOP(i2c->flags) == I2C_STOP))
-               sendStop(i2c);
-
        if (!waitRxRdy(i2c, CONFIG_I2C_START_TIMEOUT))
        {
                LOG_ERR("i2c: read start timeout\n");
@@ -173,7 +175,12 @@ static uint8_t i2c_sam3_getc(I2c *i2c)
                return 0xFF;
        }
 
-       return HWREG(i2c->hw->base + TWI_RHR_OFF);
+       data = HWREG(i2c->hw->base + TWI_RHR_OFF);
+
+       if ((i2c->xfer_size == 1) && (I2C_TEST_STOP(i2c->flags) == I2C_STOP))
+               waitXferComplete(i2c);
+
+       return data;
 }
 
 static void i2c_setClock(I2c *i2c, int clock)