add an option to turn off QSPI when sleep #3244
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jepler
reviewed
Aug 5, 2020
jepler
previously requested changes
Aug 5, 2020
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Thanks. I will make a change based on your suggestions. |
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Didn't add |
tannewt
requested changes
Aug 5, 2020
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The feature is enabled by default now. To test it, we can turn off other peripherals(USB, PWM and etc) using high frequency clock (HFCLK), and then go to sleep. The current will decrease sharply. |
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Tested the feature on a nrf52840 m2 devkit, here is a current graph
The code is: import time
@micropython.asm_thumb
def mem(r0):
ldr(r0, [r0, 0])
@micropython.asm_thumb
def mem_write(r0, r1):
str(r1, [r0, 0])
peripherals = {
'RADIO': 0x40001000,
'UART0': 0x40002000,
'UARTE0': 0x40002000,
'SPI0': 0x40003000,
'SPIM0': 0x40003000,
'SPIS0': 0x40003000,
'TWI0': 0x40003000,
'TWIM0': 0x40003000,
'TWIS0': 0x40003000,
'SPI1': 0x40004000,
'SPIM1': 0x40004000,
'SPIS1': 0x40004000,
'TWI1': 0x40004000,
'TWIM1': 0x40004000,
'TWIS1': 0x40004000,
'NFCT': 0x40005000,
'GPIOTE': 0x40006000,
'SAADC': 0x40007000,
'TIMER0': 0x40008000,
'TIMER1': 0x40009000,
'TIMER2': 0x4000A000,
'RTC0': 0x4000B000,
'TEMP': 0x4000C000,
'RNG': 0x4000D000,
'ECB': 0x4000E000,
'AAR': 0x4000F000,
'CCM': 0x4000F000,
'WDT': 0x40010000,
'RTC1': 0x40011000,
'QDEC': 0x40012000,
'COMP': 0x40013000,
'LPCOMP': 0x40013000,
'EGU0': 0x40014000,
'SWI0': 0x40014000,
'EGU1': 0x40015000,
'SWI1': 0x40015000,
'EGU2': 0x40016000,
'SWI2': 0x40016000,
'EGU3': 0x40017000,
'SWI3': 0x40017000,
'EGU4': 0x40018000,
'SWI4': 0x40018000,
'EGU5': 0x40019000,
'SWI5': 0x40019000,
'TIMER3': 0x4001A000,
'TIMER4': 0x4001B000,
'PWM0': 0x4001C000,
'PDM': 0x4001D000,
'ACL': 0x4001E000,
'NVMC': 0x4001E000,
'PPI': 0x4001F000,
'MWU': 0x40020000,
'PWM1': 0x40021000,
'PWM2': 0x40022000,
'SPI2': 0x40023000,
'SPIM2': 0x40023000,
'SPIS2': 0x40023000,
'RTC2': 0x40024000,
'I2S': 0x40025000,
'FPU': 0x40026000,
'USBD': 0x40027000,
'UARTE1': 0x40028000,
'QSPI': 0x40029000,
'CC_HOST_RGF': 0x5002A000,
'CRYPTOCELL': 0x5002A000,
'PWM3': 0x4002D000,
'SPIM3': 0x4002F000
}
# turn off PWM0
mem_write(peripherals['PWM0'] + 0x500, 0)
# turn off rgb led
mem_write(0x50000700 + 4 * 29, 2)
mem_write(0x50000700 + 4 * 30, 2)
mem_write(0x50000700 + 4 * 31, 2)
for name, addr in peripherals.items():
print('{}: {}'.format(name, mem(addr + 0x500)))
while True:
time.sleep(1) |
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To reduce power consumption of nRF52840, we can turn off QSPI when USB is not connected and MCU is going to sleep.
nRF52840 will consume less than 10 uA current in sleep mode if all peripherals using high frequency clock (HFCLK) are disabled.