gustavonihei commented on a change in pull request #3795:
URL: https://github.com/apache/incubator-nuttx/pull/3795#discussion_r640632208
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File path: arch/arm/src/s32k1xx/s32k1xx_lpspi.c
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@@ -1293,13 +1386,176 @@ static void s32k1xx_lpspi_exchange_nodma(FAR struct
spi_dev_s *dev,
#endif
{
FAR struct s32k1xx_lpspidev_s *priv = (FAR struct s32k1xx_lpspidev_s *)dev;
+ uint16_t framesize;
DEBUGASSERT(priv && priv->spibase);
spiinfo("txbuffer=%p rxbuffer=%p nwords=%d\n", txbuffer, rxbuffer, nwords);
- /* 8- or 16-bit mode? */
+ /* bit mode? */
- if (s32k1xx_lpspi_9to16bitmode(priv))
+ framesize = s32k1xx_lpspi_9to16bitmode(priv);
+ if (framesize > 16 && framesize % 32 != 0)
+ {
+ /* 17-bit or higher, byte transfer due to padding
+ * take care of big endian mode of hardware !!
+ */
+
+ const uint8_t *src = (const uint8_t *)txbuffer;
+ uint8_t *dest = (uint8_t *) rxbuffer;
+ uint32_t word = 0x0;
+#ifdef CONFIG_S32K1XX_LPSPI_DWORD
+ uint32_t word1 = 0x0;
+ uint32_t rword1;
+ bool dwords = false;
+#endif
+
+ while (nwords-- > 0)
+ {
+ /* Get the next word to write. Is there a source buffer? */
+
+ if (src)
+ {
+ /* read the required number of bytes */
+
+ switch (framesize)
+ {
+#ifdef CONFIG_S32K1XX_LPSPI_DWORD
+ case 40:
+ word = (src[0] << 24) + (src[1] << 16)
+ + (src[2] << 8) + src[3];
+ word1 = src[4];
+ src += 5;
+ dwords = true;
+ break;
+#endif
+ default:
+ break;
+ }
+ }
+ else
+ {
+ word = 0xffffffff;
+ }
+
+#ifdef CONFIG_S32K1XX_LPSPI_DWORD
+ /* Exchange 2 words */
+
+ if (dwords)
+ {
+ word = s32k1xx_lpspi_send_dword(dev, word, word1, &rword1);
+ }
+ else
+#endif
+ {
+ word = s32k1xx_lpspi_send(dev, word);
Review comment:
Alignment here seems wrong.
I am surprised that NxStyle didn't catch this.
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