#!/bin/sh

# timer_run.sh
#
# This script configures Timer4 to be run
# on the AM335X GP-EVM. After configured,
# the timer runs indefinitely at a fixed
# freq and duty cycle, fed from the
# internal 32kHz clock.
#

echo "Configuring Timer 4...\n"

# Enable Timer4's clock in CM_PER
# This allows us to access it's control regs
devmem2 0x44e00088 w 0x2

# Set the Pinmux for Timer4 (0x2 because its mode 2 of this pin)
# Using the pin mux linux driver from the SDK
echo 0x22 > /sys/kernel/debug/omap_mux/xdma_event_intr0

# Timer configurations.. Stop Timer.
# Auto-Reload
# Compare Mode Enabled
# Trigger set on overflow
# Toggle Mode
devmem2 0x48044038 w 0x1842

# Write to the CM_DPLL registers to select the clk source
# Selected the clk source for the Timer4
# This should be &= (default 0x12) (writing a 0x2 for 32kHz)
devmem2 0x44e00510 w 0x12

# Initial count value
devmem2 0x4804403C w 0xFFFFAFFF

# Set the re-load value
devmem2 0x48044040 w 0xFFFFDFFF

# Setting a duty cycle
devmem2 0x4804404C w 0xFFFFAFFF

# Force the Timer to Smart-Idle
devmem2 0x48044010 w 0x8

# Start Timer
devmem2 0x48044038 w 0x1843

# Verify that the timer is running,
# by polling the count register a
# few times. We should we up counting.
for i in {1..10}
do
 echo "Timer Value $i"
 devmem2 0x4804403C
done

# End
echo "Timer is Running!"
echo ""
echo "See TP31 on the EVM"
echo ""

# Delay added to allow time for the first timer
# overflow to occur, before any consecutive memory
# accesses are made. (Just for standby testing).
sleep 1

# Disable MODULEMODE of CM_PER_TIMER4_CLKCTRL register
# Only if this value is 0, are we able to wake-up from standby??
devmem2 0x44e00088 w 0x0

#END