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Merge pull request #7229 from dhalbert/rp2040-spi-mode-3

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RP2040: have clock start high when SPI polarity high
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Dan Halbert 2022-11-19 14:32:02 -05:00 committed by GitHub
commit 96fc85cd18
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9
ports/raspberrypi/common-hal/busio/SPI.c
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@ -151,6 +151,15 @@ bool common_hal_busio_spi_configure(busio_spi_obj_t *self,
spi_set_format(self->peripheral, bits, polarity, phase, SPI_MSB_FIRST);
// Workaround to start with clock line high if polarity=1. The hw SPI peripheral does not do this
// automatically. See https://github.com/raspberrypi/pico-sdk/issues/868 and
// https://forums.raspberrypi.com/viewtopic.php?t=336142
// TODO: scheduled to be be fixed in pico-sdk 1.5.0.
if (polarity) {
hw_clear_bits(&spi_get_hw(self->peripheral)->cr1, SPI_SSPCR1_SSE_BITS); // disable the SPI
hw_set_bits(&spi_get_hw(self->peripheral)->cr1, SPI_SSPCR1_SSE_BITS); // re-enable the SPI
}
self->polarity = polarity;
self->phase = phase;
self->bits = bits;