Hi, I’m currently trying to use the RTL8720dn chip as I2C Slave. I’ve tried using some functions and implementations of the sdk (i2c_api), but facing some weird issues where the polling mode doesn’t seem to work. Because of this, I’m curious if the Arduino package contains the full implementation. …

[image] luke: using this example has not provided the expected function when using the corresponding Master program. could you elaborate on your settings? You can refer to this example guide for detailed steps and demo

hi Tim, afaik, arduino also only uses i2c in master mode [image] TBeeren: but facing some weird issues where the polling mode doesn’t seem to work do you mind elaborate?

Hi Simon, That’s what I was a bit afraid of hahah! I tried editing the header a bit by changing the way it uses the slave. I did this by changing the TwoWireStatus and calling the functions, which are provided by the package a bit different. For writing, it seems to work. But it’s more of a brute f…

[image] TBeeren: Have you used the rtl8721d_i2c header and source of the sdk? Hi Tim, you probably should look into this file instead, as this is the api primarily used for I2C operation ambiot/ambd_sdk/blob/master/component/common/mbed/hal/i2c_api.h /** mbed Microcontroller …

Hi Simon, I could be wrong, but that’s the same as in the arduino package (AmebaD/3.0.7/system/libameba/sdk/component/common/mbed/hal/i2c_api.h), in which the slave mode seem to has lacks (as you told). [image] xidameng: afaik, arduino also inly uses i2c in master mode I can have a look in …

check this line out, is this the one you need? ambiot/ambd_sdk/blob/a98cf3fa2ef4141f8c17238143ddef4121c01857/component/common/mbed/hal/i2c_api.h#L111 int i2c_byte_write(i2c_t *obj, int data); /** * @brief Set i2c device to be slave. * @param obj: i2c object define in application sof…

Hi everyone, I’ve finally been able to get the slave in polling mode with the Master. However I’m stil facing a couple smaller issues. The image below shows a simple I2C transmission where the master (raspberry pi 4, SMBUS protocol) sends a message (0). Then the interrupt of the slave is triggered…

Hi, I am resurrecting this thread because I am attempting to use the RTL8720DN as an I2C Slave, using the Wire library included in the Arduino SDK (AmebaD/3.0.8/libraries/Wire). The problem I am facing is that the Wire.onReceive and Wire.onRequest callbacks never get called. The receiver is not c…

Hi xsutter, Cool to see you’re also trying to use the 8720DN as i2c slave! I’ve to remember what I did to get it working, but the spoiler I can already give is that it does work as slave! There were a couple thing I noticed during working with the chipset. I also never got it working with the Wire…

Hi Tim, Thanks for your suggestion ! Unless someone at Ameba gives us a fresh status of the current capabilities of the Wire library, I am afraid I will have to forget about it and dive deep into the Mbed API like you did. As for clock stretching: this can never be an operation performed by the I2…

Hi Tim, I am now switching to the Mbed i2c API. I would like to use interrupts as much as possible, however i2c_api appears to lack extensive IRQ management like we can find in spi_api or i2s_api, for example. I would like to avoid writing an i2c interrupt manager. Are you aware of someone, somewhe…

RTL8720DN as I2C slave

FreeRTOS Peripherals

xidameng March 30, 2021, 8:20am 2

hi Tim,

afaik, arduino also only uses i2c in master mode

do you mind elaborate?

RTL8720DN I2C Slave Code

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RTL8720DN as I2C slave

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