ARM: split out spi-avr.c from spi.c

spi-avr.c

@@ -0,0 +1,36 @@
+
+/** \file
+  \brief SPI routines, AVR specific part.
+*/
+
+#if defined TEACUP_C_INCLUDE && defined __AVR__
+
+/** Initialise SPI subsystem.
+
+  Code copied from ATmega164/324/644/1284 data sheet, section 18.2, page 160,
+  or moved here from mendel.c.
+*/
+void spi_init() {
+
+  // Set SCK (clock) and MOSI line to output, ie. set USART in master mode.
+  SET_OUTPUT(SCK);
+  SET_OUTPUT(MOSI);
+  SET_INPUT(MISO);
+  // SS must be set as output to disconnect it from the SPI subsystem.
+  // Too bad if something else tries to use this pin as digital input.
+  // See ATmega164/324/644/1284 data sheet, section 18.3.2, page 162.
+  // Not written there: this must apparently be done before setting the SPRC
+  // register, else future R/W-operations may hang.
+  SET_OUTPUT(SS);
+
+  #ifdef SPI_2X
+    SPSR = 0x01;
+  #else
+    SPSR = 0x00;
+  #endif
+
+  // This sets the whole SPRC register.
+  spi_speed_100_400();
+}
+
+#endif /* defined TEACUP_C_INCLUDE && defined __AVR__ */

spi.c

@@ -1,4 +1,3 @@
-
 /** \file
   \brief SPI subsystem
 
@@ -11,36 +10,16 @@
   happens before reading and writing, data exchange its self is the same for
   each device, then.
 */
+
 #include "spi.h"
 
 #ifdef SPI
 
-/** Initialise SPI subsystem.
+#define TEACUP_C_INCLUDE
-
+#include "spi-avr.c"
-  Code copied from ATmega164/324/644/1284 data sheet, section 18.2, page 160,
+// Each ARM needs it's own file
-  or moved here from mendel.c.
+// #include "spi-lpc.c"
-*/
+// #include "spi-stm32.c"
-void spi_init() {
+#undef TEACUP_C_INCLUDE
-
-  // Set SCK (clock) and MOSI line to output, ie. set USART in master mode.
-  SET_OUTPUT(SCK);
-  SET_OUTPUT(MOSI);
-  SET_INPUT(MISO);
-  // SS must be set as output to disconnect it from the SPI subsystem.
-  // Too bad if something else tries to use this pin as digital input.
-  // See ATmega164/324/644/1284 data sheet, section 18.3.2, page 162.
-  // Not written there: this must apparently be done before setting the SPRC
-  // register, else future R/W-operations may hang.
-  SET_OUTPUT(SS);
-
-  #ifdef SPI_2X
-    SPSR = 0x01;
-  #else
-    SPSR = 0x00;
-  #endif
-
-  // This sets the whole SPRC register.
-  spi_speed_100_400();
-}
 
 #endif /* SPI */