SparkFun Forums 

Where electronics enthusiasts find answers.

Hardware or product specific questions are best asked here.
User avatar
By shjeon
#217625
Hi there,

I am trying to reduce the power consumption of the Sparkfun Edge Board. (https://www.sparkfun.com/products/15170)

I found the previous post someone tried to do it. (viewtopic.php?p=217600#p217600)
"liquid.soulder" replied that always-powered sensors continuously drain power, so I desoldering 2 Mic sensors and BLE antenna.

I've tried examples from viewtopic.php?f=169&t=50904 and the below code
Code: Select all
/*
  Artemis Low Power: How low can we go?
  By: Nathan Seidle
  SparkFun Electronics
  Date: October 17th, 2019
  License: This code is public domain. Based on deepsleep.c from Ambiq SDK v2.2.0.
  A big thanks to robin_hodgson for pointing out the HFRC shutdown requirement.

  SparkFun labored with love to create this code. Feel like supporting open source hardware?
  Buy a board from SparkFun! https://www.sparkfun.com/products/15376

  How close can we get to 2.7uA in deep sleep?
  This example shows how decrease the Artemis current consumption to less than ~2.5uA in deep sleep.

  Note that Artemis modules with revision A1 silicon will use ~30uA. Please see the
  Ambiq errata for more information: https://www.ambiqmicro.com/static/mcu/files/Apollo3_Blue_Errata_List_v1_0_external_release.pdf

  To monitor the current to the Edge cut the MEAS jumper, solder in headers, and attach
  a DMM via IC hooks (https://www.sparkfun.com/products/506).

  The USB to serial bridge draws some current:
    Serial Basic C - ~1.2uA (https://www.sparkfun.com/products/15096)
    FTDI Basic - ~5.5uA (https://www.sparkfun.com/products/9873)

  The various components on the Edge2 can be powered on/off as well
    PDM microphones (2) - ~50.9uA
    Accelerometer (POR mode) - ~79.7uA
    Camera regulator enabled (no camera) - ~96.8uA
*/

void setup()
{
  Serial.begin(115200);
  Serial.println("Low power sleep example");

#if defined(ARDUINO_SFE_EDGE2)
  pinMode(ACCEL_VDD, OUTPUT);
  digitalWrite(ACCEL_VDD, LOW);

  pinMode(MIC_VDD, OUTPUT);
  digitalWrite(MIC_VDD, LOW);

  pinMode(CAMERA_VDD, OUTPUT);
  digitalWrite(CAMERA_VDD, LOW);
#endif

  //Turn off ADC
  power_adc_disable();

  // Initialize for low power in the power control block
  am_hal_pwrctrl_low_power_init();

  // Stop the XTAL.
  am_hal_clkgen_control(AM_HAL_CLKGEN_CONTROL_XTAL_STOP, 0);

  // Disable the RTC.
  am_hal_rtc_osc_disable();

  // Disabling the debugger GPIOs saves about 1.2 uA total:
  am_hal_gpio_pinconfig(20 /* SWDCLK */, g_AM_HAL_GPIO_DISABLE);
  am_hal_gpio_pinconfig(21 /* SWDIO */, g_AM_HAL_GPIO_DISABLE);

  // These two GPIOs are critical: the TX/RX connections between the Artemis module and the CH340S on the Blackboard
  // are prone to backfeeding each other. To stop this from happening, we must reconfigure those pins as GPIOs
  // and then disable them completely:
  Serial.println("The TX and RX pins need to be disabled to minimize the current draw.");
  Serial.println("You should not see any more Serial messages after this...");
  delay(100);
  am_hal_gpio_pinconfig(48 /* TXO-0 */, g_AM_HAL_GPIO_DISABLE);
  am_hal_gpio_pinconfig(49 /* RXI-0 */, g_AM_HAL_GPIO_DISABLE);

  // The default Arduino environment runs the System Timer (STIMER) off the 48 MHZ HFRC clock source.
  // The HFRC appears to take over 60 uA when it is running, so this is a big source of extra
  // current consumption in deep sleep.
  // For systems that might want to use the STIMER to generate a periodic wakeup, it needs to be left running.
  // However, it does not have to run at 48 MHz. If we reconfigure STIMER (system timer) to use the 32768 Hz
  // XTAL clock source instead the measured deepsleep power drops by about 64 uA.
  am_hal_stimer_config(AM_HAL_STIMER_CFG_CLEAR | AM_HAL_STIMER_CFG_FREEZE);

  // This option selects 32768 Hz via crystal osc. This appears to cost about 0.1 uA versus selecting "no clock"
  am_hal_stimer_config(AM_HAL_STIMER_XTAL_32KHZ);

  // This option would be available to systems that don't care about passing time, but might be set
  // to wake up on a GPIO transition interrupt.
  // am_hal_stimer_config(AM_HAL_STIMER_NO_CLK);

  // Turn OFF Flash1
  if (am_hal_pwrctrl_memory_enable(AM_HAL_PWRCTRL_MEM_FLASH_512K))
  {
    while (1)
      ;
  }

  // Power down SRAM
  PWRCTRL->MEMPWDINSLEEP_b.SRAMPWDSLP = PWRCTRL_MEMPWDINSLEEP_SRAMPWDSLP_ALLBUTLOWER32K;

  Serial.println("Going to sleep...");
  delay(100); //Wait for print to complete

  Serial.end(); //Disable Serial

  am_hal_sysctrl_sleep(AM_HAL_SYSCTRL_SLEEP_DEEP);

  //We should never get here.
}

void loop()
{
  //Do nothing
}
But, these source codes do not work for the Sparkfun Edge . The measured current consumption (monosoon power monitor) are here:
Deep Sleep @3V: 0.78mA
Sleep @3V: 0.88mA

Does anybody succeed to make Edge deep sleep?

Thx.
 Topic permissions

You can post new topics in this forum
You can reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

long long title how many chars? lets see 123 ok more? yes 60

We have created lots of YouTube videos just so you can achieve [...]

Another post test yes yes yes or no, maybe ni? :-/

The best flat phpBB theme around. Period. Fine craftmanship and [...]

Do you need a super MOD? Well here it is. chew on this

All you need is right here. Content tag, SEO, listing, Pizza and spaghetti [...]

Lasagna on me this time ok? I got plenty of cash

this should be fantastic. but what about links,images, bbcodes etc etc? [...]