[coco] first pass of motor controlled tape.

lib/bus/drivewire/drivewire.cpp

@@ -80,6 +80,10 @@ void systemBus::_drivewire_process_queue()
  */
 void systemBus::service()
 {
+    // Handle cassette play if MOTOR pin active.
+    if (_cassetteDev)
+        if (motorActive)
+            _cassetteDev->play();
 }
 
 // Setup DRIVEWIRE bus
@@ -101,6 +105,8 @@ void systemBus::setup()
         .intr_type = GPIO_INTR_POSEDGE                // interrupt on positive edge
     };
 
+    _cassetteDev = new drivewireCassette();
+
     //configure GPIO with the given settings
     gpio_config(&io_conf);
     gpio_isr_handler_add((gpio_num_t)PIN_CASS_MOTOR, drivewire_isr_handler, (void*) PIN_CASS_MOTOR);

lib/device/drivewire/cassette.cpp

@@ -3,18 +3,81 @@
 #include "cassette.h"
 
 #include <cstring>
+#include <driver/dac.h>
 
 #include "../../include/debug.h"
 
 #include "fnSystem.h"
 #include "fnUART.h"
 #include "fnFsSD.h"
+#include "fnFsSPIFFS.h"
 
 #include "led.h"
 
+#define SAMPLE_DELAY_US 89
+
+/**
+ * @brief since cassette isn't a DW device, we don't handle it here.
+ */
 void drivewireCassette::drivewire_process(uint32_t commanddata, uint8_t checksum)
 {
-    // Not really used at the moment.
+    // Not really used...
+}
+
+/**
+ * @brief Handle when motor active, and send tape via DAC
+ * @note This routine stays active until tape is done streaming.
+ */
+void drivewireCassette::play()
+{
+    casf = fsFlash.file_open("/hdbcc2.raw","r");
+
+    if (!casf)
+    {
+        Debug_printv("Could not open cassette file. Aborting.");
+        casf = NULL;
+        return;
+    }
+    else
+    {
+        Debug_printv("cassette file opened.");
+    }
+
+    Debug_printv("Enabling DAC.")
+    dac_output_enable(DAC_CHANNEL_1);
+
+    // Send silence
+    Debug_printv("sending silence");
+    for (unsigned long i=0;i<1000000UL;i++)
+        {
+            dac_output_voltage(DAC_CHANNEL_1,0);
+            esp_rom_delay_us(5);        
+        }
+
+    Debug_printv("sending data.");
+
+    while (!feof(casf))
+    {
+        uint8_t b = fgetc(casf);
+        dac_output_voltage(DAC_CHANNEL_1,b);
+        esp_rom_delay_us(SAMPLE_DELAY_US);
+    }
+
+    Debug_printv("Disabling DAC.");
+
+    dac_output_disable(DAC_CHANNEL_1);
+
+    fclose(casf);
+
+    Debug_printv("Tape done.");
+}
+
+void drivewireCassette::setup()
+{
+}
+
+void drivewireCassette::shutdown()
+{
 }
 
 #endif /* BUILD_COCO */

lib/device/drivewire/cassette.h

@@ -12,10 +12,18 @@ class drivewireCassette : public virtualDevice
 
 public:
 
+virtual void setup();
 virtual void drivewire_process(uint32_t commanddata, uint8_t checksum);
+virtual void shutdown();
+void play();
 
 private:
 
+/**
+ * @brief The file pointer used by the cassette
+ */
+FILE *casf = NULL;
+
 };
 
 #endif

lib/device/drivewire/fuji.cpp

@@ -1651,6 +1651,7 @@ void drivewireFuji::setup(systemBus *drivewirebus)
     // cassette()->set_buttons(Config.get_cassette_buttons());
     // cassette()->set_pulldown(Config.get_cassette_pulldown());
 
+    cassette()->setup();
 
 }
 

src/main.cpp

@@ -19,7 +19,6 @@
 #include "fnFsSD.h"
 
 #include "httpService.h"
-#include <driver/dac.h>
 
 #ifdef BLUETOOTH_SUPPORT
 #include "fnBluetooth.h"