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Commitd11afd1

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Merge pull request#105 from mjaspers2mtu/master
Add LED Fade and Temperature sensing example
2 parents1098afb +e6d5d96 commitd11afd1

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‎examples/fade_s2.py‎

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#
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# This file is part of the micropython-esp32-ulp project,
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# https://github.com/micropython/micropython-esp32-ulp
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#
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# SPDX-FileCopyrightText: 2018-2023, the micropython-esp32-ulp authors, see AUTHORS file.
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# SPDX-License-Identifier: MIT
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"""
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Example for: ESP32-S2
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This example creates a PWM-like dimming effect using self-modifying ULP code.
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The ULP program rewrites the `WAIT` instructions to control on/off LED durations,
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simulating a variable duty cycle.
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Note:
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The `WAIT` instruction uses an immediate operand (fixed value) for delay cycles. However, we can change the lower half of memory
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to modify these values at runtime, simulating variable wait times via registers.
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"""
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fromesp32importULP
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frommachineimportmem32
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fromesp32_ulpimportsrc_to_binary
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fromtimeimportsleep
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source="""\
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# Pin with LED: (0 to 21)
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.set led_pin, 4
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# constants from:
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# https://github.com/espressif/esp-idf/blob/v5.0.2/components/soc/esp32s2/include/soc/reg_base.h
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#define DR_REG_RTCIO_BASE 0x3f408400
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# constants from:
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# Espressif Technical Reference Manual (TRM) Chapter 5.15 Register 5.63:
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#define RTCIO_TOUCH_PADn_REG (DR_REG_RTCIO_BASE + 0x84 + 4 * led_pin)
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#define RTCIO_TOUCH_PADn_MUX_SEL_M (BIT(19))
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# constants from:
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# https://github.com/espressif/esp-idf/blob/v5.0.2/components/soc/esp32s2/include/soc/rtc_io_reg.h
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#define RTC_GPIO_OUT_REG (DR_REG_RTCIO_BASE + 0x0)
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#define RTC_GPIO_ENABLE_REG (DR_REG_RTCIO_BASE + 0xc)
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#define RTC_GPIO_ENABLE_S 10
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#define RTC_GPIO_OUT_DATA_S 10
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.global entry
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program_init:
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# connect GPIO to ULP (0: GPIO connected to digital GPIO module, 1: GPIO connected to analog RTC module)
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WRITE_RTC_REG(RTCIO_TOUCH_PADn_REG, RTCIO_TOUCH_PADn_MUX_SEL_M, 1, 1);
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# enable GPIO as output, not input (this also enables a pull-down by default)
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WRITE_RTC_REG(RTC_GPIO_ENABLE_REG, RTC_GPIO_ENABLE_S + led_pin, 1, 1)
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set_waits: add r0, r0, 200 # Increase r0 (delay time)
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move r3, wait_off
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st r0, r3, 0 # Overwrite wait_off with new delay value
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move r2, 0xFFFF
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sub r1, r2, r0 # Calculate complementary delay time
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move r3, wait_on
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st r1, r3, 0 # Overwrite wait_on with new value
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WRITE_RTC_REG(RTC_GPIO_OUT_REG, RTC_GPIO_OUT_DATA_S + led_pin, 1, 0) # turn off led (clear GPIO)
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wait_off: wait 0 # Placeholder; value overwritten dynamically
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WRITE_RTC_REG(RTC_GPIO_OUT_REG, RTC_GPIO_OUT_DATA_S + led_pin, 1, 1) # turn on led (set GPIO)
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wait_on: wait 0 # Placeholder; value overwritten dynamically
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jump set_waits # Loop program
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"""
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binary=src_to_binary(source,cpu="esp32s2")# cpu is esp32 or esp32s2
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load_addr,entry_addr=0,0
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ULP_MEM_BASE=0x50000000
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ulp=ULP()
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ulp.load_binary(load_addr,binary)
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ulp.run(entry_addr)
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whileTrue:
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print(hex(mem32[ULP_MEM_BASE+40]))# show that the WAIT cycles are changing
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sleep(0.5)

‎examples/tsens_s2.py‎

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#
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# This file is part of the micropython-esp32-ulp project,
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# https://github.com/micropython/micropython-esp32-ulp
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#
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# SPDX-FileCopyrightText: 2018-2023, the micropython-esp32-ulp authors, see AUTHORS file.
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# SPDX-License-Identifier: MIT
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"""
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Example for: ESP32-S2
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Example showing how to use the TSENS instruction from the ULP
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and access temperature data from the main CPU.
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Note that the temperature sensor clock needs to be enabled for the TSENS instruction to complete.
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"""
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fromesp32importULP
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frommachineimportmem32
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fromesp32_ulpimportsrc_to_binary
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fromtimeimportsleep
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source="""\
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# constants from:
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# https://github.com/espressif/esp-idf/blob/v5.0.2/components/soc/esp32s2/include/soc/reg_base.h
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#define DR_REG_SENS_BASE 0x3f408800
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# constants from:
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# https://github.com/espressif/esp-idf/blob/v5.0.2/components/soc/esp32s2/include/soc/sens_reg.h
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#define SENS_SAR_TSENS_CTRL2_REG (DR_REG_SENS_BASE + 0x0054)
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#define SENS_TSENS_CLKGATE_EN_M (BIT(15))
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.set token, 0xACED
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.text
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magic: .long 0
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temperature_data: .long 0
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.global entry
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entry:
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move r3, magic
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ld r0, r3, 0
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jumpr start, token, eq #check if we have already initialized
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init:
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# Set SENS_TSENS_CLKGATE_EN to enable temperature sensor clock.
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WRITE_RTC_REG(SENS_SAR_TSENS_CTRL2_REG, SENS_TSENS_CLKGATE_EN_M, 1, 1)
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# Store temperature_data memory location in r2
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move r2, temperature_data
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# store that we're done with initialisation
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move r0, token
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st r0, r3, 0
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start:
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tsens r0, 1000 # make measurement for 1000 clock cycles
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st r0, r2, 0 # store the temperature in memory to be read by main CPU
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halt # go back to sleep until next wakeup period
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"""
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binary=src_to_binary(source,cpu="esp32s2")# cpu is esp32 or esp32s2
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load_addr,entry_addr=0,8
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ULP_MEM_BASE=0x50000000
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ULP_DATA_MASK=0xffff# ULP data is only in lower 16 bits
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ulp=ULP()
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ulp.set_wakeup_period(0,500000)# use timer0, wakeup after 500000usec (0.5s)
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ulp.load_binary(load_addr,binary)
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ulp.run(entry_addr)
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whileTrue:
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magic_token=hex(mem32[ULP_MEM_BASE+load_addr]&ULP_DATA_MASK)
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current_temperature=0.4386*(mem32[ULP_MEM_BASE+load_addr+4]&ULP_DATA_MASK)-20.52
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print(magic_token,current_temperature)
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sleep(0.5)

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