From 123cc4c756cc8a22f66351ab65595c5a20e53e27 Mon Sep 17 00:00:00 2001
From: Clyne Sullivan <clyne@clyne-lp.lan>
Date: Sat, 31 Jul 2021 10:47:00 -0400
Subject: reorganized source, wip

---
 source/periph/dac.hpp | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 source/periph/dac.hpp

(limited to 'source/periph/dac.hpp')

diff --git a/source/periph/dac.hpp b/source/periph/dac.hpp
new file mode 100644
index 0000000..4360c26
--- /dev/null
+++ b/source/periph/dac.hpp
@@ -0,0 +1,36 @@
+/**
+ * @file dac.hpp
+ * @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/>.
+ */
+
+#ifndef STMDSP_DAC_HPP_
+#define STMDSP_DAC_HPP_
+
+#include "hal.h"
+#undef DAC
+
+class DAC
+{
+public:
+    static void begin();
+
+    static void start(int channel, dacsample_t *buffer, size_t count);
+    static void stop(int channel);
+
+    static int sigGenWantsMore();
+
+private:
+    static DACDriver *m_driver[2];
+
+    static const DACConfig m_config;
+    static const DACConversionGroup m_group_config;
+};
+
+#endif // STMDSP_DAC_HPP_
+
-- 
cgit v1.2.3


From 3dd57491b1e81a9d93054eff19ca0e6c65c85b9b Mon Sep 17 00:00:00 2001
From: Clyne Sullivan <clyne@bitgloo.com>
Date: Sat, 20 Nov 2021 14:29:08 -0500
Subject: fixed signal generator input data streaming

---
 source/communication.cpp | 25 +++++++++++++------------
 source/periph/dac.cpp    | 13 ++++++++++++-
 source/periph/dac.hpp    |  1 +
 3 files changed, 26 insertions(+), 13 deletions(-)

(limited to 'source/periph/dac.hpp')

diff --git a/source/communication.cpp b/source/communication.cpp
index ec02a42..b5ee28e 100644
--- a/source/communication.cpp
+++ b/source/communication.cpp
@@ -112,22 +112,23 @@ void updateGenerator(unsigned char *cmd)
     if (EM.assert(USBSerial::read(&cmd[1], 2) == 2, Error::BadParamSize)) {
         unsigned int count = cmd[1] | (cmd[2] << 8);
         if (EM.assert(count <= MAX_SAMPLE_BUFFER_SIZE, Error::BadParam)) {
-            if (run_status == RunStatus::Idle) {
+            if (!DAC::isSigGenRunning()) {
                 Samples::Generator.setSize(count);
                 USBSerial::read(
                     reinterpret_cast<uint8_t *>(Samples::Generator.data()),
                     Samples::Generator.bytesize());
-            } else if (run_status == RunStatus::Running) {
-                int more;
-                do {
-                    chThdSleepMicroseconds(10);
-                    more = DAC::sigGenWantsMore();
-                } while (more == -1);
-
-                // Receive streamed samples in half-buffer chunks.
-                USBSerial::read(reinterpret_cast<uint8_t *>(
-                    more == 0 ? Samples::Generator.data() : Samples::Generator.middata()),
-                    Samples::Generator.bytesize() / 2);
+            } else {
+                const int more = DAC::sigGenWantsMore();
+                if (more == -1) {
+                    USBSerial::write(reinterpret_cast<const uint8_t *>("\0"), 1);
+                } else {
+                    USBSerial::write(reinterpret_cast<const uint8_t *>("\1"), 1);
+
+                    // Receive streamed samples in half-buffer chunks.
+                    USBSerial::read(reinterpret_cast<uint8_t *>(
+                        more == 0 ? Samples::Generator.data() : Samples::Generator.middata()),
+                        Samples::Generator.bytesize() / 2);
+                }
             }
         }
     }
diff --git a/source/periph/dac.cpp b/source/periph/dac.cpp
index 1ff8867..35c2908 100644
--- a/source/periph/dac.cpp
+++ b/source/periph/dac.cpp
@@ -61,7 +61,18 @@ void DAC::start(int channel, dacsample_t *buffer, size_t count)
 
 int DAC::sigGenWantsMore()
 {
-    return dacIsDone;
+    if (dacIsDone != -1) {
+        int tmp = dacIsDone;
+        dacIsDone = -1;
+        return tmp;
+    } else {
+        return -1;
+    }
+}
+
+int DAC::isSigGenRunning()
+{
+    return m_driver[1]->state == DAC_ACTIVE;
 }
 
 void DAC::stop(int channel)
diff --git a/source/periph/dac.hpp b/source/periph/dac.hpp
index 4360c26..7250a52 100644
--- a/source/periph/dac.hpp
+++ b/source/periph/dac.hpp
@@ -24,6 +24,7 @@ public:
     static void stop(int channel);
 
     static int sigGenWantsMore();
+    static int isSigGenRunning();
 
 private:
     static DACDriver *m_driver[2];
-- 
cgit v1.2.3