stm32l0_pwrtest

This is a simple test program for experimenting with and verifying power management on STM32L0 boards.

• Building
• Setup with 4801
• Commands
  • help
  • r: read registers
  • sleep
  • standby
  • stop
  • w: write registers
• System commands
  • cpuid
  • echo
  • fram dump
  • fram reset
  • system configure
  • system reset
• Sleep power consumption
  • Catena 4801
  • Catena 4612
  • Catena 4618
  • Catena 4618-M201

Building

This program requires the Catena-Arduino-Platform (and the associated libraries).

It's easier to do testing on the Catena 4801.

Setup with 4801

1. Attach an ST-LINK-2 to the SWD pins of the 4801 using jumpers.

   .

   4801 Pin	Label	ST-Link Pin
   JP1-1	+VDD	1
   JP1-2	GND	3
   JP1-3	SWDCLK	9
   JP1-4	SWDIO	7
   JP1-5	nRST	15

   Note that these are almost linear; only 9 and 7 on the ST-Link are swapped.

2. Attach an Adafruit FT232H USB to TTL serial adapter.

   4801 Pin	Label	FT232H
   JP4-2	D0	D0
   JP4-3	D1	D1

3. Connect the serial adapter to PC via USB. Ensure (in device manager) that the FTDI driver is creating a COM port. Use TeraTerm and open the COM port. In Setup>Serial, set speed to 115200. In Setup>Terminal:

   1. Set New-line Receive: to LF,
   2. Set New-line Transmit: to CR+LF,
   3. Make sure to check Local echo.

4. Attach power using a OTII box.

   4801 Pin	Label	OTII Pin
   JP6-1	GND	BLK
   JP6-2	+VDD	RED

5. Launch OTII software and set power to 3.3V, 200 mA limit.

Commands

help

Displays a terse list of commands.

r: read registers

Read and display one or more registers. The first argument is the base register address. If there's no second argument, then only one 32-bit word is read and displayed. Othersise, the second argument is the number of words to read and display.

Both base and length are given in hexadecimal.

sleep

This command uses the CatenaRTC::Sleep() method to suspend the system. If an argument is provided, it gives the sleep time in seconds. Otherwise, the system sleeps for 5 seconds. The delay is given in decimal.

standby

Not implemented.

stop

Not implemented.

w: write registers

Write values to successive registers. The first argument is the base address, which must be 32-bit aligned. Subsequent arguments are taken as the 32-bit values to be written.

Both base and the values are given in hexadecimal.

System commands

These commands are supplied by the framework

cpuid

Read and display the CPU ID.

echo

Print the arguments to the consoles.

fram dump

Dump FRAM. The first argument is the base, the second (if given) is the number of bytes to display. Both are given in hexadecimal.

fram reset

If given with no arguments, the FRAM is reset in a non-desctructive way. If written as fram reset hard, the FRAM is reinitialized by re-writing the header.

system configure

Set one of several system configuration parameters: syseui, operatingflags, or platformguid.

system reset

Reset the system.

Sleep power consumption

On uploading this power test sketch, we measured the sleep power of Catena 4801, 4618-M201, 4618, 4612 using OTII tool.

Catena 4801

The average sleep power of Catena 4801 is ~6 uA. The below graph shows the sleep power with minimum, maximum and average values.

Catena 4612

The average sleep power of Catena 4612 is ~17 uA. The below graph shows the sleep power with minimum, maximum and average values.

Catena 4618

The average sleep power of Catena 4618 is ~20 uA. The below graph shows the sleep power with minimum, maximum and average values.

Catena 4618-M201

The average sleep power of Catena 4618-M201 is ~22 uA. The below graph shows the sleep power with minimum, maximum and average values.