add SPI header

diff --git a/msp4th/ns430-spi.h b/msp4th/ns430-spi.h
new file mode 100644 (file)
index 0000000..ba737e2
--- /dev/null
+++ b/msp4th/ns430-spi.h
@@ -0,0 +1,32 @@
+#if !defined(NS430_SPI)
+#define NS430_SPI
+
+#include "ns430.h"
+
+/* SPIx_CR bits */
+#define SPI_TDRE_IE     (1 << 0)
+#define SPI_TXEMPTY_IE  (1 << 1)
+#define SPI_RDRF_IE     (1 << 2)
+#define SPI_OVER_IE     (1 << 3)
+#define SPI_EN          (1 << 4)
+#define SPI_CPOL        (1 << 5)
+#define SPI_CPHA        (1 << 6)
+#define SPI_DL          (1 << 7)
+
+/* SPI_SCBR
+ * 8-bit number
+ * Baud = CLK / (2 * (1 + SBCR))
+ * or
+ * BCR = (CLK / (2 * Baud)) - 1
+ */
+
+#define SPI_SCBR(c, b) (((c / (2 * b)) - 1) << 8)
+
+/* SPIx_SR bits */
+#define TDRE        (1 << 0)
+#define TXEMPTY     (1 << 1)
+#define RDRF        (1 << 2)
+#define OVER        (1 << 3)
+
+
+#endif