Bugfix: Better detection of Pi platform

Tests/testMain.cpp

@@ -20,7 +20,7 @@ using RegMap = QPULib::RegisterMap;
 
 
 //
-// get the base directory right for calling AutoTest
+// get the base directory right for calling compiled apps.
 //
 #ifdef DEBUG
 	#define POSTFIX_DEBUG "-debug"
@@ -35,19 +35,32 @@ using RegMap = QPULib::RegisterMap;
 	#define POSTFIX_QPU ""
 #endif
 
+#define BIN_PATH "obj" POSTFIX_DEBUG POSTFIX_QPU "/bin"
 
 //
 // This is a good place to put simple, global tests
 //
-const char *AUTOTEST_PATH = "obj" POSTFIX_DEBUG POSTFIX_QPU "/bin/AutoTest";
+const char *AUTOTEST_PATH = BIN_PATH "/AutoTest";
 
 
-TEST_CASE("Check random specifications for interpreter and emulator2", "[specs]") {
+TEST_CASE("Check random specifications for interpreter and emulator2", "[specs][cmdline]") {
 	printf("Running AutoTest from '%s'\n", AUTOTEST_PATH);
 	REQUIRE(system(AUTOTEST_PATH) == 0);
 }
 
 
+TEST_CASE("Detect platform scripts should both return the same thing", "[cmdline]") {
+	int ret1 = system(BIN_PATH "/detectPlatform > /dev/null");
+	bool success1 = (ret1 == 0);
+
+	int ret2 = system("Tools/detectPlatform.sh > /dev/null");
+	bool success2 = (ret2 == 0);
+
+	INFO("C++ script returned " << ret1 << ", shell script returned " << ret2);
+	REQUIRE(success1 == success2);
+}
+
+
 #ifdef QPU_MODE
 
 TEST_CASE("Test correct working of RegisterMap", "[regmap]") {

Tools/detectPlatform.cpp

@@ -1,4 +1,5 @@
 #include <unistd.h>  // geteuid()
+#include <string.h>  // strstr()
 #include <string>
 #include <fstream>
 #include <streambuf>
@@ -35,19 +36,80 @@ bool loadFileInString(const char *filename, std::string & out_str) {
 
 
 /**
- * @brief Detect if this is running on a Rpi.
+ * @brief Detect Pi platform for newer Pi versions.
  *
- * @returns 0 if this is so, 1 if it's a different platform.
+ * On success, it displays a string with the model version.
+ *
+ * @return true if Pi detected, false otherwise
  */
-int main(int argc, char *argv[]) {
+bool detect_from_sys() {
 	const char *filename = "/sys/firmware/devicetree/base/model";
 
 	std::string content;
 	bool success = loadFileInString(filename, content);
 	if (success && !content.empty()) {
 		printf("Detected platform: %s\n", content.c_str());
-	} else {
-		printf("This is not a RPi platform\n");
+    return true;
+	}
+
+	return false;
+}
+
+
+/**
+ * @brief Detect Pi platform for older Pi versions.
+ *
+ * Detects if this is a VideoCore. This should be sufficient for detecting Pi,
+ * since it's the only thing to date(!) using this particular chip version.
+ *
+ * @return true if Pi detected, false otherwise
+ *
+ * --------------------------------------------------------------------------
+ * ## NOTES
+ *
+ * * The following are valid model numbers:
+ *
+ *  - BCM2708
+ *  - BCM2835    - This appears to be returned for all higher BCM versions
+ *
+ * * The following are also valid, but appear to be represented by 'BCM2835'
+ *   in `/proc/cpuinfo`:
+ *
+ *  - BCM2836   // If that's not the case, enable these as well
+ *  - BCM2837
+ *  - BCM2837B0
+ */
+bool detect_from_proc() {
+	const char *BCM_VERSION_PREFIX = "BCM2";
+	const char *filename = "/proc/cpuinfo";
+
+	std::ifstream t(filename);
+	if (!t.is_open()) return false;
+
+	std::string line;
+	while (getline(t, line)) {
+	  if (!strstr(line.c_str(), "Hardware")) continue;
+
+		if (strstr(line.c_str(), BCM_VERSION_PREFIX)) {
+	  	// For now, don't try to exactly specify the model.
+			// This could be done with field "Revision' in current input.
+			printf("This is a Pi platform\n");
+			return true;
+		}
+  }
+
+	return false;
+}
+
+
+/**
+ * @brief Detect if this is running on a Rpi.
+ *
+ * @returns 0 if this is so, 1 if it's a different platform.
+ */
+int main(int argc, char *argv[]) {
+	if (!detect_from_sys() && !detect_from_proc()) {
+		printf("This is not a Pi platform\n");
 		return 1;
 	}
 

Tools/detectPlatform.sh

@@ -9,6 +9,9 @@
 
 file=/sys/firmware/devicetree/base/model
 
+#
+# This works for later version of Pi (distro's)
+#
 if [ -f $file ]
 then
 	model=$(tr -d '\0' < $file)  # as `cat`, but avoid warning 'ignored null byte in input'
@@ -26,5 +29,27 @@ then
 	fi
 fi
 
-echo This is not an RPi platform
+
+#
+# This should work for all Pi's.
+#
+# Detect if this is a VideoCore. This should be sufficient for detecting Pi,
+# since it's the only thing to date(!) using this particular chip version.
+#
+# There are several model numbers possible, but they should all start with 'BCM2'.
+#
+
+# Prefix of allowed model numbers
+modelPrefix=BCM2
+
+model=$(cat /proc/cpuinfo | grep Hardware | grep $modelPrefix)
+ret=$?
+if [ $ret -eq 0 ]
+then
+	echo This is a Pi platform
+	exit 0
+fi
+
+
+echo This is not a Pi platform
 exit 1