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test_mmio.py
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test_mmio.py
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import os
import sys
import time
import periphery
from .test import ptest, pokay, passert, AssertRaises
if sys.version_info[0] == 3:
raw_input = input
PAGE_SIZE = 4096
CONTROL_MODULE_BASE = 0x44e10000
USB_VID_PID_OFFSET = 0x7f4
USB_VID_PID = 0x04516141
RTCSS_BASE = 0x44e3e000
RTC_SCRATCH2_REG_OFFSET = 0x68
RTC_KICK0R_REG_OFFSET = 0x6C
RTC_KICK1R_REG_OFFSET = 0x70
def test_arguments():
ptest()
def test_open_close():
ptest()
# Open aligned base
mmio = periphery.MMIO(CONTROL_MODULE_BASE, PAGE_SIZE)
# Check properties
passert("property base", mmio.base == CONTROL_MODULE_BASE)
passert("property size", mmio.size == PAGE_SIZE)
# Try to write immutable properties
with AssertRaises("write immutable", AttributeError):
mmio.base = 1000
with AssertRaises("write immutable", AttributeError):
mmio.size = 1000
mmio.close()
# Open unaligned base
mmio = periphery.MMIO(CONTROL_MODULE_BASE + 123, PAGE_SIZE)
# Check properties
passert("property base", mmio.base == CONTROL_MODULE_BASE + 123)
passert("property size", mmio.size == PAGE_SIZE)
# Read out of bounds
with AssertRaises("read 1 byte over", ValueError):
mmio.read32(PAGE_SIZE - 3)
with AssertRaises("read 2 bytes over", ValueError):
mmio.read32(PAGE_SIZE - 2)
with AssertRaises("read 3 bytes over", ValueError):
mmio.read32(PAGE_SIZE - 1)
with AssertRaises("read 4 bytes over", ValueError):
mmio.read32(PAGE_SIZE)
mmio.close()
def test_loopback():
ptest()
# Open control module
mmio = periphery.MMIO(CONTROL_MODULE_BASE, PAGE_SIZE)
# Read and compare USB VID/PID with read32()
passert("compare USB VID/PID", mmio.read32(USB_VID_PID_OFFSET) == USB_VID_PID)
# Read and compare USB VID/PID with bytes read
data = mmio.read(USB_VID_PID_OFFSET, 4)
data = bytearray(data)
passert("compare byte 1", data[0] == USB_VID_PID & 0xff)
passert("compare byte 2", data[1] == (USB_VID_PID >> 8) & 0xff)
passert("compare byte 3", data[2] == (USB_VID_PID >> 16) & 0xff)
passert("compare byte 4", data[3] == (USB_VID_PID >> 24) & 0xff)
mmio.close()
# Open RTC subsystem
mmio = periphery.MMIO(RTCSS_BASE, PAGE_SIZE)
# Disable write protection
mmio.write32(RTC_KICK0R_REG_OFFSET, 0x83E70B13)
mmio.write32(RTC_KICK1R_REG_OFFSET, 0x95A4F1E0)
# Write/Read RTC Scratch2 Register
mmio.write32(RTC_SCRATCH2_REG_OFFSET, 0xdeadbeef)
passert("compare write 32-bit uint and readback", mmio.read32(RTC_SCRATCH2_REG_OFFSET) == 0xdeadbeef)
# Write/Read RTC Scratch2 Register with bytes write
mmio.write(RTC_SCRATCH2_REG_OFFSET, b"\xaa\xbb\xcc\xdd")
data = mmio.read(RTC_SCRATCH2_REG_OFFSET, 4)
passert("compare write 4-byte bytes and readback", data == b"\xaa\xbb\xcc\xdd")
# Write/Read RTC Scratch2 Register with bytearray write
mmio.write(RTC_SCRATCH2_REG_OFFSET, bytearray(b"\xbb\xcc\xdd\xee"))
data = mmio.read(RTC_SCRATCH2_REG_OFFSET, 4)
passert("compare write 4-byte bytearray and readback", data == b"\xbb\xcc\xdd\xee")
# Write/Read RTC Scratch2 Register with list write
mmio.write(RTC_SCRATCH2_REG_OFFSET, [0xcc, 0xdd, 0xee, 0xff])
data = mmio.read(RTC_SCRATCH2_REG_OFFSET, 4)
passert("compare write 4-byte list and readback", data == b"\xcc\xdd\xee\xff")
# Write/Read RTC Scratch2 Register with 16-bit write
mmio.write16(RTC_SCRATCH2_REG_OFFSET, 0xaabb)
passert("compare write 16-bit uint and readback", mmio.read16(RTC_SCRATCH2_REG_OFFSET) == 0xaabb)
# Write/Read RTC Scratch2 Register with 8-bit write
mmio.write8(RTC_SCRATCH2_REG_OFFSET, 0xab)
passert("compare write 8-bit uint and readback", mmio.read8(RTC_SCRATCH2_REG_OFFSET) == 0xab)
mmio.close()
def test_interactive():
ptest()
mmio = periphery.MMIO(RTCSS_BASE, PAGE_SIZE)
# Check tostring
print("MMIO description: {}".format(str(mmio)))
passert("interactive success", raw_input("MMIO description looks ok? y/n ") == "y")
print("Waiting for seconds ones digit to reset to 0...\n")
# Wait until seconds low go to 0, so we don't have to deal with
# overflows in comparing times
tic = time.time()
while mmio.read32(0x00) & 0xf != 0:
periphery.sleep(1)
passert("less than 12 seconds elapsed", (time.time() - tic) < 12)
# Compare passage of OS time with RTC time
tic = time.time()
rtc_tic = mmio.read32(0x00) & 0xf
bcd2dec = lambda x: 10 * ((x >> 4) & 0xf) + (x & 0xf)
print("Date: {:04d}-{:02d}-{:02d}".format(2000 + bcd2dec(mmio.read32(0x14)), bcd2dec(mmio.read32(0x10)), bcd2dec(mmio.read32(0x0c))))
print("Time: {:02d}:{:02d}:{:02d}".format(bcd2dec(mmio.read32(0x08) & 0x7f), bcd2dec(mmio.read32(0x04)), bcd2dec(mmio.read32(0x00))))
periphery.sleep(3)
print("Date: {:04d}-{:02d}-{:02d}".format(2000 + bcd2dec(mmio.read32(0x14)), bcd2dec(mmio.read32(0x10)), bcd2dec(mmio.read32(0x0c))))
print("Time: {:02d}:{:02d}:{:02d}".format(bcd2dec(mmio.read32(0x08) & 0x7f), bcd2dec(mmio.read32(0x04)), bcd2dec(mmio.read32(0x00))))
toc = time.time()
rtc_toc = mmio.read32(0x00) & 0xf
passert("real time elapsed", (toc - tic) > 2)
passert("rtc time elapsed", (rtc_toc - rtc_tic) > 2)
mmio.close()
if __name__ == "__main__":
if os.environ.get("CI") == "true":
test_arguments()
sys.exit(0)
print("WARNING: This test suite assumes a BeagleBone Black (AM335x) host!")
print("Other systems may experience unintended and dire consequences!")
raw_input("Press enter to continue!")
test_arguments()
pokay("Arguments test passed.")
test_open_close()
pokay("Open/close test passed.")
test_loopback()
pokay("Loopback test passed.")
test_interactive()
pokay("Interactive test passed.")
pokay("All tests passed!")