1 files changed, 74 insertions, 0 deletions
diff --git a/source/periph/dac.cpp b/source/periph/dac.cpp
new file mode 100644
index 0000000..1ff8867
--- /dev/null
+++ b/source/periph/dac.cpp
@@ -0,0 +1,74 @@
+/**
+ * @file dac.cpp
+ * @brief Manages signal creation using the DAC.
+ *
+ * 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 "dac.hpp"
+#include "sclock.hpp"
+
+DACDriver *DAC::m_driver[2] = {
+    &DACD1, &DACD2
+};
+
+const DACConfig DAC::m_config = {
+    .init = 2048,
+    .datamode = DAC_DHRM_12BIT_RIGHT,
+    .cr = 0
+};
+
+static int dacIsDone = -1;
+static void dacEndCallback(DACDriver *dacd)
+{
+    if (dacd == &DACD2)
+        dacIsDone = dacIsBufferComplete(dacd) ? 1 : 0;
+}
+
+const DACConversionGroup DAC::m_group_config = {
+    .num_channels = 1,
+    .end_cb = dacEndCallback,
+    .error_cb = nullptr,
+#if defined(TARGET_PLATFORM_H7)
+    .trigger = 5 // TIM6_TRGO
+#elif defined(TARGET_PLATFORM_L4)
+    .trigger = 0 // TIM6_TRGO
+#endif
+};
+
+void DAC::begin()
+{
+    palSetPadMode(GPIOA, 4, PAL_STM32_MODE_ANALOG);
+    palSetPadMode(GPIOA, 5, PAL_STM32_MODE_ANALOG);
+
+    dacStart(m_driver[0], &m_config);
+    dacStart(m_driver[1], &m_config);
+}
+
+void DAC::start(int channel, dacsample_t *buffer, size_t count)
+{
+    if (channel >= 0 && channel < 2) {
+        if (channel == 1)
+            dacIsDone = -1;
+        dacStartConversion(m_driver[channel], &m_group_config, buffer, count);
+        SClock::start();
+    }
+}
+
+int DAC::sigGenWantsMore()
+{
+    return dacIsDone;
+}
+
+void DAC::stop(int channel)
+{
+    if (channel >= 0 && channel < 2) {
+        dacStopConversion(m_driver[channel]);
+        SClock::stop();
+    }
+}
+