rp2040: Only change SPI settings while peripheral is disabled

Make sure to disable/enable the peripheral to ensure the clock polarity is properly set prior to a change in CS. Signed-off-by: Kevin O'Connor <[email protected]>
Klipper3d · Jan 25, 2024 · 5e433ff · 5e433ff
1 parent f1982ed
commit 5e433ff
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/src/rp2040/spi.c b/src/rp2040/spi.c
@@ -89,8 +89,12 @@ void
 spi_prepare(struct spi_config config)
 {
     spi_hw_t *spi = config.spi;
+    if (spi->cr0 == config.cr0 && spi->cpsr == config.cpsr)
+        return;
+    spi->cr1 = 0;
     spi->cr0 = config.cr0;
     spi->cpsr = config.cpsr;
+    spi->cr1 = SPI_SSPCR1_SSE_BITS;
 }
 
 void