PFW-1530 Add Tune to Selector screen and more

- Rename "Idler" to "Sensitivity"
- Implement ReadRegisterInner() as a way to read register in blocking contexts such as manage_response()
This allows us to show the current EEPROM value on the printer's LCD

Firmware/mmu2.cpp

@@ -80,6 +80,7 @@ void MMU2::StopKeepPowered() {
 
 void MMU2::Tune() {
     switch (lastErrorCode) {
+    case ErrorCode::HOMING_SELECTOR_FAILED:
     case ErrorCode::HOMING_IDLER_FAILED:
     {
         // Prompt a menu for different values
@@ -147,6 +148,29 @@ bool MMU2::ReadRegister(uint8_t address) {
         logic.ReadRegister(address); // we may signal the accepted/rejected status of the response as return value of this function
     } while (!manage_response(false, false));
 
+    // Update cached value
+    lastReadRegisterValue = logic.rsp.paramValue;
+    return true;
+}
+
+bool MMU2::ReadRegisterInner(uint8_t address) {
+    if (!WaitForMMUReady())
+        return false;
+
+    // Plan a request for the register value at address
+    logic.ReadRegister(address);
+    
+    do {
+        // Maintain MMU communications
+        marlin_manage_inactivity(true);
+        mmu_loop_inner(false);
+    } while (
+        logicStepLastStatus != StepStatus::Finished
+        && logic.rsp.request.value == address // If the MMU protocol is busy decoding another request, we must wait
+    );
+
+    // Update cached value
+    lastReadRegisterValue = logic.rsp.paramValue;
     return true;
 }
 

Firmware/mmu2.h

@@ -88,6 +88,12 @@ public:
     /// @returns true upon success
     bool ReadRegister(uint8_t address);
 
+    /// Variant of ReadRegister which runs in blocking context such as manage_response()
+    /// Be careful of using this as it is not recursion protected!
+    /// @param address Address of register in hexidecimal
+    /// @return true upon success
+    bool ReadRegisterInner(uint8_t address);
+
     /// Write from a MMU register (See gcode M708)
     /// @param address Address of register in hexidecimal
     /// @param data Data to write to register
@@ -194,6 +200,12 @@ public:
     inline void IncrementTMCFailures() { ++tmcFailures; }
     inline void ClearTMCFailures() { tmcFailures = 0; }
 
+    /// Retrieve cached value parsed from ReadRegister()
+    /// or using M707
+    inline uint16_t GetLastReadRegisterValue() const {
+        return lastReadRegisterValue;
+    };
+
 private:
     /// Perform software self-reset of the MMU (sends an X0 command)
     void ResetX0();
@@ -301,6 +313,7 @@ private:
     ErrorCode lastErrorCode = ErrorCode::MMU_NOT_RESPONDING;
     ErrorSource lastErrorSource = ErrorSource::ErrorSourceNone;
     Buttons lastButton = Buttons::NoButton;
+    uint16_t lastReadRegisterValue = 0;
 
     StepStatus logicStepLastStatus;
 

Firmware/mmu2/errors_list.h

@@ -380,7 +380,7 @@ static const uint8_t errorButtons[] PROGMEM = {
     Btns(ButtonOperations::Retry, ButtonOperations::NoOperation),//FSENSOR_TOO_EARLY
     Btns(ButtonOperations::Retry, ButtonOperations::NoOperation),//INSPECT_FINDA
     Btns(ButtonOperations::Continue, ButtonOperations::NoOperation),//LOAD_TO_EXTRUDER_FAILED
-    Btns(ButtonOperations::Retry, ButtonOperations::NoOperation),//SELECTOR_CANNOT_HOME
+    Btns(ButtonOperations::Retry, ButtonOperations::Tune),//SELECTOR_CANNOT_HOME
     Btns(ButtonOperations::Retry, ButtonOperations::NoOperation),//SELECTOR_CANNOT_MOVE
     Btns(ButtonOperations::Retry, ButtonOperations::Tune),//IDLER_CANNOT_HOME
     Btns(ButtonOperations::Retry, ButtonOperations::NoOperation),//IDLER_CANNOT_MOVE

Firmware/mmu2_error_converter.cpp

@@ -205,7 +205,6 @@ Buttons ButtonAvailable(uint16_t ec) {
     case ERR_MECHANICAL_FSENSOR_FILAMENT_STUCK:
     case ERR_MECHANICAL_FSENSOR_TOO_EARLY:
     case ERR_MECHANICAL_INSPECT_FINDA:
-    case ERR_MECHANICAL_SELECTOR_CANNOT_HOME:
     case ERR_MECHANICAL_SELECTOR_CANNOT_MOVE:
     case ERR_MECHANICAL_IDLER_CANNOT_MOVE:
     case ERR_MECHANICAL_PULLEY_CANNOT_MOVE:
@@ -218,6 +217,7 @@ Buttons ButtonAvailable(uint16_t ec) {
             break;
         }
         break;
+    case ERR_MECHANICAL_SELECTOR_CANNOT_HOME:
     case ERR_MECHANICAL_IDLER_CANNOT_HOME:
         switch (buttonSelectedOperation) {
         // may be allow move selector right and left in the future

Firmware/mmu2_reporting.cpp

@@ -1,3 +1,4 @@
+#include <avr/pgmspace.h>
 #include "mmu2.h"
 #include "mmu2_log.h"
 #include "mmu2_reporting.h"
@@ -360,24 +361,59 @@ void ScreenClear(){
     lcd_clear();
 }
 
-// These are global while testing this concept
-uint8_t stallGuardValue = 6; // default
 bool tuningDone = false;
 
+struct TuneItem {
+    uint8_t address;
+    uint8_t minValue;
+    uint8_t maxValue;
+} __attribute__((packed));
+
+static const TuneItem TuneItems[] PROGMEM = {
+  { (uint8_t)Register::Selector_sg_thrs_R, 1, 4},
+  { (uint8_t)Register::Idler_sg_thrs_R, 4, 7},
+};
+
+static_assert(sizeof(TuneItems)/sizeof(TuneItem) == 2);
+
+typedef struct
+{
+    menu_data_edit_t reserved; //13 bytes reserved for number editing functions
+    int8_t status;             // 1 byte
+    uint8_t currentValue;      // 1 byte
+    TuneItem item;             // 3 bytes
+} _menu_tune_data_t;
+
+static_assert(sizeof(_menu_tune_data_t) == 18);
+static_assert(sizeof(menu_data)>= sizeof(_menu_tune_data_t),"_menu_tune_data_t doesn't fit into menu_data");
+
 void tuneIdlerStallguardThresholdMenu() {
-    constexpr uint8_t maxStallguardThreshold = 7;
-    constexpr uint8_t minStallguardThreshold = 4;
+    static constexpr _menu_tune_data_t * const _md = (_menu_tune_data_t*)&(menu_data[0]);
+    if (_md->status == 0)
+    {
+        _md->status = 1; // Menu entered for the first time
+        lcd_timeoutToStatus.stop(); // Do not timeout the screen
+
+        // Fetch the TuneItem from PROGMEM
+        const uint8_t offset = (mmu2.MMUCurrentErrorCode() == ErrorCode::HOMING_IDLER_FAILED) ? 1 : 0;
+        memcpy_P(&(_md->item), &TuneItems[offset], sizeof(TuneItem));
+
+        // Fetch the value which is currently in MMU EEPROM
+        mmu2.ReadRegisterInner((uint8_t)_md->item.address);
+        _md->currentValue = mmu2.GetLastReadRegisterValue();
+    }
+
     MENU_BEGIN();
     ON_MENU_LEAVE(
         tuningDone = true;
-        mmu2.WriteRegister(0x19, (uint16_t)stallGuardValue);
+        mmu2.WriteRegister(_md->item.address, (uint16_t)_md->currentValue);
     );
     MENU_ITEM_BACK_P(_i("Done"));
     MENU_ITEM_EDIT_int3_P(
-        _i("Idler"),
-        &stallGuardValue,
-        minStallguardThreshold,
-        maxStallguardThreshold
+        _i("Sensitivity"),
+        &_md->currentValue,
+        _md->item.minValue,
+        _md->item.maxValue
     );
     MENU_END();
 }