RE: how to send i2s data by timer in NCS1.8.0?

yoyou — Wed, 16 Feb 2022 00:22:39 GMT

got it

thanks

RE: how to send i2s data by timer in NCS1.8.0?

Vidar Berg — Mon, 14 Feb 2022 13:27:18 GMT

Hello,

This API cannot be used from an interrupt context (timer callback in this case). That is why the assert is raised:

ASSERTION FAIL [!arch_is_in_isr() || ((timeout).ticks == (((k_timeout_t) {})).ticks)] @ WEST_TOPDIR/zephyr/kernel/msg_q.c:118

A solution is to use a semaphore like this:

K_SEM_DEFINE(i2s_transfer, 0, 1);

void timer_ms_handler(struct k_timer *dummy)
{
	k_sem_give(&i2s_transfer);
}

void test_main() 
{
	...
	while(1) {
		k_sem_take(&i2s_transfer, K_FOREVER);
		i2c_transfer_send();
	}
}

Best regards,

Vidar