Day37 - IIO FIFO Mode

Objective

• Validate FIFO mode operation
• Verify watermark-based interrupt behavior
• Confirm burst read and buffered output

---

Lab 1 – Non-FIFO baseline

sudo insmod myadc_iio.ko
bash enable_iio_buffer.sh
bash read_iio_buffer.sh

Expected:

• IRQ triggered per sample
• Continuous incremental data

---

Lab 2 – Enable FIFO mode

sudo rmmod myadc_iio
sudo insmod myadc_iio.ko fifo_enable=1 fifo_watermark=4

---

Lab 3 – Enable IIO buffer

bash enable_iio_buffer.sh

Verify:

in_voltage0_en = 1
in_voltage1_en = 1
in_voltage2_en = 1
in_voltage3_en = 1
buffer_enable = 1

---

Lab 4 – Read buffered data

bash read_iio_buffer.sh

Expected:

• Continuous data stream
• Multiple samples per IRQ

---

Lab 5 – Compare IRQ frequency

watch -n 0.5 cat /proc/interrupts

Observation:

Mode	IRQ Frequency
Non-FIFO	High
FIFO	Lower

---

Lab 6 – Driver log verification

dmesg | tail

Expected:

read fifo done
read fifo done

Indicates:

• IRQ triggered
• FIFO drained by driver