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SPIM Soft SS Not working #16

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alvarop opened this Issue Apr 6, 2018 · 1 comment

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@alvarop

alvarop commented Apr 6, 2018

If .ss_pin is set to NRFX_SPIM_PIN_NOT_USED in nrfx_spim_init, the setting is not copied into the stored config in m_cb. This results in pin 0 being toggled during every SPIM transaction (since ss_pin in m_cb defaults to 0).

The config is only copied here:

m_cb[p_instance->drv_inst_idx].ss_pin = p_config->ss_pin;

Which only happens if ss_pin is != NRFX_SPIM_PIN_NOT_USED

if (p_config->ss_pin != NRFX_SPIM_PIN_NOT_USED)

Later, in spim_xfer(), the ss_pin setting (which is now 0) is used to determine whether or not to toggle, which causes the issue:

if (p_cb->ss_pin != NRFX_SPIM_PIN_NOT_USED)

@kl-cruz

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kl-cruz commented Apr 9, 2018

Hi,
Sure, that's right. It will be fixed soon.
Thanks for this.

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