spi cs

[ephraim]

Dear Sir.

I am using SPI as follows.

gpio_pin_write(dev_io, LIS2DH12_CS_PIN, false);
err = spi_transceive(spi_dev1, &spi_cfg1, &tx, &rx);
gpio_pin_write(dev_io, LIS2DH12_CS_PIN, true);

In this case 2 spi bytes are sent. the CS length contains the spi clock and is 30 us.

In another case 

gpio_pin_write(dev_io, LIS2DH12_CS_PIN, false);
err = spi_transceive(spi_dev1, &spi_cfg1, &tx, &rx);
gpio_pin_write(dev_io, LIS2DH12_CS_PIN, true);

In this case7 spi bytes are sent. the CS length is finished before spi clock are over  and is 20 us.

How can I tell if the SPI transaction is over ?.

Please Advise

[frax84]

Hi,

you should share the part of code for "tx" and "rx" spi_buf_set setup to allow better support.

Håkon Alseth said:

I would also recommend providing the CSN pin as an input to the spi config (struct spi_config), member .csn

I'm using this setting with success. With this, CS management is done by the nrf9160.