Hi,

I have been tracing a call to rtc_gpio_pullup_dis(GPIO_NUM_2). This leads to a call to rtcio_ll_pullup_disable where bit 27 is cleared of RTCIO_TOUCH_PAD2_REG. I checked the TRM for this register (Register 4.54) but for bit 27 it says "reserved". What am I missing here?

TIA,
AP

Thanks, that helped. I got it to work with:
AP

Hi, I have been looking at this example where the author used the ULP to make an LED blink: https://github.com/joba-1/Blink-ULP The example uses GPIO 2 (RTC GPIO 12) to connect the LED. I tried unsuccessfully to change the example to make use of GPIO 25. According to table 4.4 of the TRM GPIO 25 is ...

Thanks for your example! I'm trying to do the opposite: do the initialization on the main CPU and then let the ULP do the blinking. I commented out the two WRITE_RTC_REG to initialize GPIO_NUM_2 and then tried: rtc_gpio_init(GPIO_NUM_2); rtc_gpio_set_direction(GPIO_NUM_2, RTC_GPIO_MODE_OUTPUT_ONLY);...

thanks, Angus. Works as advertised!

AP

Hi, in one of my projects I have various ESP-style components that contribute functionality that is *not* accessed by the "main" component via function calls. E.g., there is no API-dependence from "main" to the component. That means that the clever ESP-IDF built system will just simply not link the ...

Hi, I looked at the generated assembly for a simple memory mapped GPIO access: GPIO.out_w1ts = SOME_VAL; Here is the assembly I see: l32r a9, SOME_VAL l32r a8, GPIO memw s32i.n a9, a8, 8 I wanted to ask about the memw instruction. First of all, why is the memw instruction before the s32i instruction...

kissinno wrote: ↑

Fri Aug 14, 2020 10:55 am

BTW, what MCP23017 lib are your using?

I am not using any library; only the standard ESP-IDF SPI API.

here you go. Again, I am using the SPI variant; not I2C: // Configure SPI bus spi_bus.flags = SPICOMMON_BUSFLAG_MASTER; spi_bus.sclk_io_num = SPI_PIN_NUM_CLK; spi_bus.mosi_io_num = SPI_PIN_NUM_MOSI; spi_bus.miso_io_num = SPI_PIN_NUM_MISO; spi_bus.quadwp_io_num = -1; spi_bus.quadhd_io_num = -1; spi_b...

Here is a quote from MCP23017 specs : The INTn interrupt output can be configured as active- low, active-high or open-drain via the IOCON register. However, do note that by default it's not an open-drain configuration, so in theory you can have a startup scenario where the chip will output 5V on th...