Add software support for sawtooth block

demo/Makefile

@@ -5,7 +5,7 @@ include $(SOC_DIRECTORY)/software/common.mak
 
 OBJECTS   = donut.o helloc.o crt0.o main.o
 ifdef WITH_CXX
-	OBJECTS += hellocpp.o leds.o
+	OBJECTS += hellocpp.o leds.o audio.o
 	CFLAGS += -DWITH_CXX
 endif
 

demo/audio.cpp

@@ -0,0 +1,7 @@
+#include <generated/csr.h>
+#include <stdio.h>
+
+extern "C" void audio(int);
+void audio(int v) {
+	audio_targ_write(v);
+}

demo/main.c

@@ -73,7 +73,7 @@ static void prompt(void) {
 /*-----------------------------------------------------------------------*/
 /* Help                                                                  */
 /*-----------------------------------------------------------------------*/
-
+// void audio_targ_write(uint32_t v)
 static void help(void) {
 	puts("\nLiteX custom demo app built "__DATE__
 		 " "__TIME__
@@ -91,6 +91,9 @@ static void help(void) {
 #ifdef CSR_LEDS_BASE
 	puts("leds               - Led set demo");
 #endif
+#ifdef CSR_AUDIO_BASE
+	puts("audio              - Sawtooth Audio demo");
+#endif
 #endif
 }
 
@@ -152,6 +155,15 @@ static void leds_cmd(char **val) {
 	leds(value);
 }
 #endif
+#ifdef CSR_AUDIO_BASE
+extern void audio(int);
+
+static void audio_cmd(char **val) {
+	int value = (int)strtol(get_token(val), NULL, 0);
+	printf("Setting Sawtooth to %dHz\n", value);
+	audio(value);
+}
+#endif
 #endif
 
 extern void donut(void);
@@ -202,12 +214,16 @@ static void console_service(void) {
 	else if (strcmp(token, "helloc") == 0)
 		helloc_cmd();
 #ifdef WITH_CXX
-#ifdef CSR_LEDS_BASE
 	else if (strcmp(token, "hellocpp") == 0)
 		hellocpp_cmd();
+#ifdef CSR_LEDS_BASE
 	else if (strcmp(token, "leds") == 0)
 		leds_cmd(&str);
 #endif
+#ifdef CSR_AUDIO_BASE
+	else if (strcmp(token, "audio") == 0)
+		audio_cmd(&str);
+#endif
 #endif
 	prompt();
 }