18 different 16 Bit transactions,

[Vani456]

Hi,

I'm trying to transfer 18 different transactions with 16 bit each from slave to master, the Clock is set to 125kHz.

Therefor I put the CC on another free GPIO pin and attached an interrupt on this additional "CS Line". In the ISR I check for the rising edge and then write the data from an array to spi_slave_tx_buf[0]. Because I want 18 different data to be transmitted (for testing purposes, 0xAAAA and 0xFFFF should be transmitted alternately) I use a counter:

if (enableLOW == false && DirectionSignal == LOW){
spi_slave_tx_buf[0] = TMData[counter];
++counter;
if(counter > 18) {
counter = 0;
}
}

The DirectionSignal is just a Signal with the value 0/1, on this Signal depends if the slave shall send or receive data.

If the ISR is done and I went back to my code there is just this code to transmit the data:

if (DirectionSignal == LOW) {
if (slave.remained() == 0) {
slave.queue(spi_slave_rx_buf, spi_slave_tx_buf, BUFFER_SIZE);
}
}
while (slave.available()) {
slave.pop();
}

When I check the transmitted data i receive the following bit patterns:

I've already tried it with 8Bit and it was working as expected.

Since my board version is incompatible with the latest version of your library, I use the previous version 0.1.2. There I changed the parameters(rx_buf, tx_buf) of the functions from uint8_t to uint16_t. But since it still does not work, I have the impression that I overlook something at one point that still needs to be changed.

I hope you can help me with this!
Vani456

[tarzanboy13]

I have same issue, and using newest lib version... Trying to recv/send 32 Bits
This is weird and frustrating, always have problem with this bit shifting while sending big data bigger than 8 Bits.

update: When I use on Master function void transferBytes(const uint8_t * data, uint8_t * out, uint32_t size); then data are messed on both side, but when I use e.g: Response = SPI.transfer32(0xABCD1234); , all is working flawlessly

[hideakitai]

Could you try it with the latest arduino-esp32 core (not the library)?

[hideakitai]

If you still need help with the latest arduino-esp32 core and the latest ESP32SPISlave, please feel free to reopen.

In that case, please attach a minimal code that can reproduce the example.