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drivers: i2c: sam0: add support for I2C_MSG_RESTART

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This support was accidentally removed in the re-shuffle in de18f97

Signed-off-by: Attie Grande <attie.grande@argentum-systems.co.uk>
This commit is contained in:
Attie Grande 2023-03-02 20:04:47 +00:00 committed by Carles Cufí
parent 7d9da1c687
commit cf20ff0765
1 changed files with 18 additions and 1 deletions
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19
drivers/i2c/i2c_sam0.c
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@ -155,7 +155,24 @@ static void i2c_sam0_isr(const struct device *dev)
if (status & SERCOM_I2CM_INTFLAG_MB) {
if (!data->msg.size) {
i2c->INTENCLR.reg = SERCOM_I2CM_INTENCLR_MASK;
i2c->CTRLB.bit.CMD = 3;
/*
* Decide whether to issue a repeated start, or a stop condition...
* - A repeated start can either be accomplished by writing a 0x1
* to the CMD field, or by writing to ADDR - which is what this
* driver does in i2c_sam0_transfer().
* - A stop is accomplished by writing a 0x3 to CMD (below).
*
* This decision is not the same as continue_next, as the value of
* data->msg.size is already zero (not one), and i2c_sam0_transfer()
* is responsible for advancing to the next message, not the ISR.
*/
if ((data->num_msgs <= 1)
|| (data->msgs[0].flags & I2C_MSG_STOP)
|| !(data->msgs[1].flags & I2C_MSG_RESTART)) {
i2c->CTRLB.bit.CMD = 3;
}
k_sem_give(&data->sem);
return;
}