Hello,
I have a setup with a ESP32S3 Dev-Module as I²C master and a TI C2000 TMS320F28069M board as a I²C slave. The ESP32 is supposed to send the C2000 several signal. Each signal has three bytes. First a comand byte to separate the signals and then two bytes as payload (uint16 or int16). The C2000-code is implemented in Simulink. In the future, the C2000 shall respond to certain signals with data.

My first issue is that the I2C RCV (Receive) Block outputs my signals in a way that the the byte order changes. For example, the comand byte which is supposed to be always the first byte is sometimes the second or third byte. The order changes throughout restarts and is not predictable. As a solution to this problem I want to use I²C interrupts. This brings me to my second and main question:

I can not get the I²C communication to work with the interrupts. My ESP32 stops sending data as soon as the C2000 code with I²C interrupts is uploaded and running. It seems like the I²C ISR of the C2000 is never called and somehow stops the ESP32 from sending further messages.

To diagnose my problem, I already did the following without success:
Added a free-running counter in the ISR-function to see if the function gets called. The counter stays at zero.
Analyzed and used code-fragments of the C2000 c28x_i2c_eeprom_interrupt example in my code.
Checked I²C with oscilloscope and bus-decoder: Without the Interrupts, the I²C Messages are transmitted and acknowledged. With Interrupt, a successful transmission happens exactly one time, then stops. SCL stays low, SDA stays high.
Tried different Interrupts, tried different interrupt settings.
My guesses:
Wrong settings/configuration of ISR/hardware /some registers
Timing problems
Some kind of incompactibility between C2000/ESP32
User error
I attached 4 screenshots of my settings, the my code-example and two screenshots without ISR and two with ISR of my oscilloscope.
I prepared a small Simulink file with my code. If you want to run the code, open "Nur_I2C.slx". Open the subsystem. There are two parts, one with ISR and one without. Just comment one part and uncomment the other. Everything after the delay is for the differentiation of the signals.Hello,
I have a setup with a ESP32S3 Dev-Module as I²C master and a TI C2000 TMS320F28069M board as a I²C slave. The ESP32 is supposed to send the C2000 several signal. Each signal has three bytes. First a comand byte to separate the signals and then two bytes as payload (uint16 or int16). The C2000-code is implemented in Simulink. In the future, the C2000 shall respond to certain signals with data.

My first issue is that the I2C RCV (Receive) Block outputs my signals in a way that the the byte order changes. For example, the comand byte which is supposed to be always the first byte is sometimes the second or third byte. The order changes throughout restarts and is not predictable. As a solution to this problem I want to use I²C interrupts. This brings me to my second and main question:

I can not get the I²C communication to work with the interrupts. My ESP32 stops sending data as soon as the C2000 code with I²C interrupts is uploaded and running. It seems like the I²C ISR of the C2000 is never called and somehow stops the ESP32 from sending further messages.

To diagnose my problem, I already did the following without success:
Added a free-running counter in the ISR-function to see if the function gets called. The counter stays at zero.
Analyzed and used code-fragments of the C2000 c28x_i2c_eeprom_interrupt example in my code.
Checked I²C with oscilloscope and bus-decoder: Without the Interrupts, the I²C Messages are transmitted and acknowledged. With Interrupt, a successful transmission happens exactly one time, then stops. SCL stays low, SDA stays high.
Tried different Interrupts, tried different interrupt settings.
My guesses:
Wrong settings/configuration of ISR/hardware /some registers
Timing problems
Some kind of incompactibility between C2000/ESP32
User error
I attached 4 screenshots of my settings, the my code-example and two screenshots without ISR and two with ISR of my oscilloscope.
I prepared a small Simulink file with my code. If you want to run the code, open "Nur_I2C.slx". Open the subsystem. There are two parts, one with ISR and one without. Just comment one part and uncomment the other. Everything after the delay is for the differentiation of the signals. Hello,
I have a setup with a ESP32S3 Dev-Module as I²C master and a TI C2000 TMS320F28069M board as a I²C slave. The ESP32 is supposed to send the C2000 several signal. Each signal has three bytes. First a comand byte to separate the signals and then two bytes as payload (uint16 or int16). The C2000-code is implemented in Simulink. In the future, the C2000 shall respond to certain signals with data.

My first issue is that the I2C RCV (Receive) Block outputs my signals in a way that the the byte order changes. For example, the comand byte which is supposed to be always the first byte is sometimes the second or third byte. The order changes throughout restarts and is not predictable. As a solution to this problem I want to use I²C interrupts. This brings me to my second and main question:

I can not get the I²C communication to work with the interrupts. My ESP32 stops sending data as soon as the C2000 code with I²C interrupts is uploaded and running. It seems like the I²C ISR of the C2000 is never called and somehow stops the ESP32 from sending further messages.

To diagnose my problem, I already did the following without success:
Added a free-running counter in the ISR-function to see if the function gets called. The counter stays at zero.
Analyzed and used code-fragments of the C2000 c28x_i2c_eeprom_interrupt example in my code.
Checked I²C with oscilloscope and bus-decoder: Without the Interrupts, the I²C Messages are transmitted and acknowledged. With Interrupt, a successful transmission happens exactly one time, then stops. SCL stays low, SDA stays high.
Tried different Interrupts, tried different interrupt settings.
My guesses:
Wrong settings/configuration of ISR/hardware /some registers
Timing problems
Some kind of incompactibility between C2000/ESP32
User error
I attached 4 screenshots of my settings, the my code-example and two screenshots without ISR and two with ISR of my oscilloscope.
I prepared a small Simulink file with my code. If you want to run the code, open "Nur_I2C.slx". Open the subsystem. There are two parts, one with ISR and one without. Just comment one part and uncomment the other. Everything after the delay is for the differentiation of the signals. c2000, i2c, i²c, communication, hardware, isr, interrupt MATLAB Answers — New Questions

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