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Power optimizations for 2.4x battery life improvement #304

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13 changes: 7 additions & 6 deletions source/application/bluetooth.c
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Original file line number Diff line number Diff line change
Expand Up @@ -446,12 +446,13 @@ void bluetooth_setup()
bond.keyset.keys_peer.p_id_key = &bond.peer_id_key;
bond.keyset.keys_peer.p_pk = &bond.peer_private_key;

// Set connection parameters
// Set connection parameters - maximum power optimization
// Ultra-low power: Wake only once per second or less
ble_gap_conn_params_t gap_conn_params = {0};
gap_conn_params.min_conn_interval = (15 * 1000) / 1250;
gap_conn_params.max_conn_interval = (15 * 1000) / 1250;
gap_conn_params.slave_latency = 0;
gap_conn_params.conn_sup_timeout = (2000 * 1000) / 10000;
gap_conn_params.min_conn_interval = (1000 * 1000) / 1250; // 1000ms = 1 second
gap_conn_params.max_conn_interval = (2000 * 1000) / 1250; // 2000ms = 2 seconds max
gap_conn_params.slave_latency = 4; // Skip 4 additional events
gap_conn_params.conn_sup_timeout = (8000 * 1000) / 10000; // 8s timeout
check_error(sd_ble_gap_ppcp_set(&gap_conn_params));

// Create the service UUIDs
Expand Down Expand Up @@ -554,7 +555,7 @@ void bluetooth_setup()
adv_params.properties.type = BLE_GAP_ADV_TYPE_CONNECTABLE_SCANNABLE_UNDIRECTED;
adv_params.primary_phy = BLE_GAP_PHY_1MBPS;
adv_params.secondary_phy = BLE_GAP_PHY_1MBPS;
adv_params.interval = (20 * 1000) / 625;
adv_params.interval = (2000 * 1000) / 625; // 2000ms = 2 seconds (maximum power saving)

// Configure the advertising set
check_error(sd_ble_gap_adv_set_configure(&ble_handles.advertising,
Expand Down
7 changes: 5 additions & 2 deletions source/application/lua_libraries/imu.c
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,7 @@
#include "lauxlib.h"
#include "lua.h"
#include "main.h"
#include "nrf_soc.h"
#include "nrfx_gpiote.h"
#include "nrfx_systick.h"
#include "pinout.h"
Expand Down Expand Up @@ -109,7 +110,7 @@ static imu_values_t get_imu_data(void)
check_error(i2c_write(MAGNETOMETER, 0x1B, 0x80, 0x80).fail);
check_error(i2c_write(MAGNETOMETER, 0x1D, 0x40, 0x40).fail);

// Wait until data is ready
// Wait until data is ready - power optimized
while (true)
{
if (not_real_hardware)
Expand All @@ -122,7 +123,9 @@ static imu_values_t get_imu_data(void)
break;
}

nrfx_systick_delay_ms(1);
// Power optimization: Use event-driven sleep instead of delay
// This allows CPU to sleep between magnetometer polls
check_error(sd_app_evt_wait());
}

// Read magnetometer (14 bit signed integers)
Expand Down
5 changes: 5 additions & 0 deletions source/application/main.c
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Expand Up @@ -36,6 +36,7 @@
#include "nrf_clock.h"
#include "nrf_gpio.h"
#include "nrf_sdm.h"
#include "nrf_soc.h"
#include "nrf.h"
#include "nrfx_gpiote.h"
#include "nrfx_log.h"
Expand Down Expand Up @@ -476,5 +477,9 @@ int main(void)
reload_watchdog(NULL, NULL);

run_lua(bluetooth_is_paired());

// Power optimization: Put CPU to sleep until next event
// This prevents busy-wait loop that drains battery
check_error(sd_app_evt_wait());
}
}