SPI code added (experimental)

include/spisend.h

@@ -1,9 +1,34 @@
 #ifndef _SPISEND_H
 #define _SPISEND_H
 
+#include "globals.h"
+#include "spi.h"
+
 extern TaskHandle_t SpiTask;
 extern QueueHandle_t SPISendQueue;
 
+/*
+ * Process data in SPI send queue
+ */
 void spi_loop(void *pvParameters);
 
+/*
+* initialize local SPI wire interface
+*/
+void hal_spi_init();
+
+/*
+ * Perform SPI write transaction on local SPI wire interface
+ *   - write the command byte 'cmd'
+ *   - write 'len' bytes out of 'buf'
+ */
+void hal_spi_write(uint8_t cmd, const uint8_t* buf, int len);
+
+/*
+ * Perform SPI read transaction on local SPI wire interface
+ *   - read the command byte 'cmd'
+ *   - read 'len' bytes into 'buf'
+ */
+void hal_spi_read(uint8_t cmd, uint8_t* buf, int len);
+
 #endif