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Copy I2C_M_NOSTART support from sam7v/sam_twihs.c driver

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This commit is contained in:
Bernd Walter 2023-03-05 15:15:43 +01:00 committed by Xiang Xiao
parent c4c2b14623
commit 5ca9adbe61
1 changed files with 68 additions and 14 deletions
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82
arch/arm/src/sam34/sam_twi.c
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@ -475,21 +475,53 @@ static int twi_interrupt(int irq, void *context, void *arg)
if (priv->xfrd >= msg->length)
{
/* The transfer is complete. Disable the RXRDY interrupt and
* enable the TXCOMP interrupt
struct i2c_msg_s *next = (msg + 1);
/* Is there another message to after this one? Does it require a
* restart?
*/
twi_putrel(priv, SAM_TWI_IDR_OFFSET, TWI_INT_RXRDY);
twi_putrel(priv, SAM_TWI_IER_OFFSET, TWI_INT_TXCOMP);
if (priv->msgc <= 1 || (next->flags & I2C_M_NOSTART) == 0)
{
/* The transfer is complete. Disable the RXRDY interrupt and
* enable the TXCOMP interrupt
*/
twi_putrel(priv, SAM_TWI_IDR_OFFSET, TWI_INT_RXRDY);
twi_putrel(priv, SAM_TWI_IER_OFFSET, TWI_INT_TXCOMP);
}
else
{
/* No.. just switch to the next message and continue
* receiving. On the next RXRDY, we will continue with the
* first byte of the next message.
*/
DEBUGASSERT((next->flags & I2C_M_READ) != 0);
priv->msg = next;
priv->msgc--;
priv->xfrd = 0;
}
}
/* Not yet complete, but will the next be the last byte? */
else if (priv->xfrd == (msg->length - 1))
{
/* Yes, set the stop signal */
struct i2c_msg_s *next = (msg + 1);
twi_putrel(priv, SAM_TWI_CR_OFFSET, TWI_CR_STOP);
/* Is there another message to after this one? Does it require a
* restart?
*/
if (priv->msgc <= 1 || (next->flags & I2C_M_NOSTART) == 0)
{
/* This is the last message OR a restart is required before
* the next message. Send the stop signal.
*/
twi_putrel(priv, SAM_TWI_CR_OFFSET, TWI_CR_STOP);
}
}
}
@ -501,18 +533,40 @@ static int twi_interrupt(int irq, void *context, void *arg)
if (priv->xfrd >= msg->length)
{
/* The transfer is complete. Disable the TXRDY interrupt and
* enable the TXCOMP interrupt
struct i2c_msg_s *next = (msg + 1);
/* Is there another message to after this one? Does it require a
* restart?
*/
twi_putrel(priv, SAM_TWI_IDR_OFFSET, TWI_INT_TXRDY);
twi_putrel(priv, SAM_TWI_IER_OFFSET, TWI_INT_TXCOMP);
if (priv->msgc <= 1 || (next->flags & I2C_M_NOSTART) == 0)
{
/* The transfer is complete. Disable the TXRDY interrupt and
* enable the TXCOMP interrupt
*/
/* Send the STOP condition */
twi_putrel(priv, SAM_TWI_IDR_OFFSET, TWI_INT_TXRDY);
twi_putrel(priv, SAM_TWI_IER_OFFSET, TWI_INT_TXCOMP);
regval = twi_getrel(priv, SAM_TWI_CR_OFFSET);
regval |= TWI_CR_STOP;
twi_putrel(priv, SAM_TWI_CR_OFFSET, regval);
/* Send the STOP condition */
regval = twi_getrel(priv, SAM_TWI_CR_OFFSET);
regval |= TWI_CR_STOP;
twi_putrel(priv, SAM_TWI_CR_OFFSET, regval);
}
else
{
/* No.. just switch to the next message and continue
* sending.
*/
DEBUGASSERT((next->flags & I2C_M_READ) == 0);
priv->msg = next;
priv->msgc--;
twi_putrel(priv, SAM_TWI_THR_OFFSET, next->buffer[0]);
priv->xfrd = 1;
}
}
/* No, there are more bytes remaining to be sent */