How do I physically connect a STM32 (host), nrf53 (BLE) and nrf70 (Wi-Fi)? Hoping for 2 (Q)SPI ports for STM32 <=> nRF53 and nRF53 <=> nRF70, but there is only one.

[Guilherme de Paula]

Hi,

How do I physically connect a STM32 (host), nrf53 (BLE) and nrf70 (Wi-Fi)? Hoping for 2 (Q)SPI ports for STM32 <=> nRF53 and nRF53 <=> nRF70, but there is only one.

Does the rRF53 support USB to connect to STM32? This way I would only need one (Q)SPI to talk to the nRF70.

Thanks!

Gil

[Amanda Hsieh]

Hi, 

I am checking with the internal and will update the case later. 

Regards,
Amanda H.

[Guilherme de Paula]

Ok, thanks.

It looks like there also an SPIS (SPI slave) port. So a possible solution would be:

STM32 SPI (Master) <=> nRF53 SPI (Slave) --- 8 Mbps

nRF53 QSPI (Master) <=> nRF70 QSPI (Slave) --- 96 Mbps

Still a bit of a bottleneck...

[Amanda Hsieh]

Hi, 

Useable nRF70 throughput over SPI will not exceed 14 Mbps. See the throughput. 

The suggestion from the team would be STM32<=SPI or USB=>nRF53<=QSPI=>nRF70. We are not sure how flexible QSPI would be for connection to STM32 anyway, but nRF70 emulates an external flash device when using QSPI.

Regards,
Amanda H.

[gdepaula]

Ok. Thank you Amanda!