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drivers: i2c: sam: fix the exception when transferring without data

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The issue is found when doing shell command "i2c scan" on sama7g54-ek.
In this case no data will be transferred besides START and STOP. Data
abort would occur on accessing "msg->buf[msg->idx++]" when MMU is
enabled and "msg->idx" is very large.

Signed-off-by: Tony Han <tony.han@microchip.com>
This commit is contained in:
Tony Han 2025-04-14 10:38:01 +08:00 committed by Daniel DeGrasse
parent 04277560d3
commit 9f0ca750f8
1 changed files with 1 additions and 1 deletions
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2
drivers/i2c/i2c_sam_twi.c
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@ -293,7 +293,7 @@ static void i2c_sam_twi_isr(const struct device *dev)
/* Byte sent */
if (isr_status & TWI_SR_TXRDY) {
if (msg->idx == msg->len) {
if (msg->idx == msg->len || msg->len == 0) {
if (msg->flags & I2C_MSG_STOP) {
/* Send a STOP condition on the TWI */
twi->TWI_CR = TWI_CR_STOP;