initial commit

* combine all source files into this monorepo

* convert all third-party source packages into submodules

* small fixes due to changes in latest third-part packages

1 files changed, 78 insertions, 0 deletions

diff --git a/firmware/source/sclock.cpp b/firmware/source/sclock.cpp
new file mode 100644
index 0000000..6660f95
--- /dev/null
+++ b/firmware/source/sclock.cpp
@@ -0,0 +1,78 @@
+/**
+ * @file sclock.cpp
+ * @brief Manages sampling rate clock speeds.
+ *
+ * Copyright (C) 2021 Clyne Sullivan
+ *
+ * Distributed under the GNU GPL v3 or later. You should have received a copy of
+ * the GNU General Public License along with this program.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "sclock.hpp"
+
+GPTDriver *SClock::m_timer = &GPTD6;
+unsigned int SClock::m_div = 1;
+unsigned int SClock::m_runcount = 0;
+
+const GPTConfig SClock::m_timer_config = {
+#if defined(TARGET_PLATFORM_H7)
+    .frequency = 4800000,
+#else
+    .frequency = 36000000,
+#endif
+    .callback = nullptr,
+    .cr2 = TIM_CR2_MMS_1, /* TRGO */
+    .dier = 0
+};
+
+const std::array<unsigned int, 6> SClock::m_rate_divs = {{
+#if defined(TARGET_PLATFORM_H7)
+    /* 8k  */ 600,
+    /* 16k */ 300,
+    /* 20k */ 240,
+    /* 32k */ 150,
+    /* 48k */ 100,
+    /* 96k */ 50
+#else
+    /* 8k  */ 4500,
+    /* 16k */ 2250,
+    /* 20k */ 1800,
+    /* 32k */ 1125,
+    /* 48k */ 750,
+    /* 96k */ 375
+#endif
+}};
+
+void SClock::begin()
+{
+    gptStart(m_timer, &m_timer_config);
+}
+
+void SClock::start()
+{
+    if (m_runcount++ == 0)
+        gptStartContinuous(m_timer, m_div);
+}
+
+void SClock::stop()
+{
+    if (--m_runcount == 0)
+        gptStopTimer(m_timer);
+}
+
+void SClock::setRate(SClock::Rate rate)
+{
+    m_div = m_rate_divs[static_cast<unsigned int>(rate)];
+}
+
+unsigned int SClock::getRate()
+{
+    for (unsigned int i = 0; i < m_rate_divs.size(); ++i) {
+        if (m_rate_divs[i] == m_div)
+            return i;
+    }
+
+    return static_cast<unsigned int>(-1);
+}
+