some small adc fixes (impreoving trigger)

units/adc/_adc_core.c

@@ -31,11 +31,11 @@ void UADC_DMA_Handler(void *arg)
         const bool te = LL_DMA_IsActiveFlag_TE(isrsnapshot, priv->dma_chnum);
 
         // check what mode we're in
-        const bool m_trig = priv->opmode == ADC_OPMODE_TRIGD;
+        const bool m_trigd = priv->opmode == ADC_OPMODE_TRIGD;
         const bool m_stream = priv->opmode == ADC_OPMODE_STREAM;
         const bool m_fixcpt = priv->opmode == ADC_OPMODE_FIXCAPT;
 
-        if (m_trig || m_stream || m_fixcpt) {
+        if (m_trigd || m_stream || m_fixcpt) {
             if (ht || tc) {
                 const uint16_t start = priv->stream_startpos;
                 uint16_t end;
@@ -57,7 +57,7 @@ void UADC_DMA_Handler(void *arg)
                 if (start != end) {
                     uint32_t sgcount = (end - start) / priv->nb_channels;
 
-                    if (m_trig || m_fixcpt) {
+                    if (m_trigd || m_fixcpt) {
                         sgcount = MIN(priv->trig_stream_remain, sgcount);
                         priv->trig_stream_remain -= sgcount;
                     }
@@ -67,14 +67,16 @@ void UADC_DMA_Handler(void *arg)
 
                     // TODO send the data together with remaining count (used to detect end of transmission)
 
-                    if (m_trig || m_fixcpt) {
+                    if (m_trigd || m_fixcpt) { // Trig'd or Block capture - check for the max count condition
                         if (priv->trig_stream_remain == 0) {
                             dbg("End of capture");
                             UADC_ReportEndOfStream(unit);
-                            UADC_SwitchMode(unit, ADC_OPMODE_IDLE);
+
-                            if (priv->auto_rearm && m_trig) {
+                            // If auto-arm enabled, we need to re-arm again.
-                                UADC_SwitchMode(unit, ADC_OPMODE_ARMED);
+                            // However, EOS irq is disabled during the capture.
-                            }
+                            // We have to wait for the next EOS interrupt to occur.
+                            // TODO verify if keeping the EOS irq enabled during capture has significant performance penalty. If not, we can leave it enabled.
+                            UADC_SwitchMode(unit, (priv->auto_rearm && m_trigd) ? ADC_OPMODE_REARM_PENDING : ADC_OPMODE_IDLE);
                         }
                     }
                 } else {
@@ -143,8 +145,8 @@ void UADC_ADC_EOS_Handler(void *arg)
 
             priv->last_samples[i] = val;
 
-            if (priv->opmode == ADC_OPMODE_ARMED) {
             if (i == priv->trigger_source) {
+                if (priv->opmode == ADC_OPMODE_ARMED) {
                     dbg("Trig line level %d", (int)val);
 
                     bool trigd = false;
@@ -165,12 +167,22 @@ void UADC_ADC_EOS_Handler(void *arg)
                     if (trigd) {
                         UADC_HandleTrigger(unit, edge_type, timestamp);
                     }
+                }
+                else if (priv->opmode == ADC_OPMODE_REARM_PENDING) {
+                    if (!priv->auto_rearm) {
+                        // It looks like the flag was cleared by DISARM before we got a new sample.
+                        // Let's just switch to IDLE
+                        UADC_SwitchMode(unit, ADC_OPMODE_IDLE);
+                    } else {
+                        // Re-arming for a new trigger
+                        UADC_SwitchMode(unit, ADC_OPMODE_ARMED);
+                    }
+                }
 
                 priv->trig_prev_level = val;
             }
         }
     }
-    }
 }
 
 void UADC_HandleTrigger(Unit *unit, uint8_t edge_type, uint64_t timestamp)
@@ -290,8 +302,8 @@ void UADC_SwitchMode(Unit *unit, enum uadc_opmode new_mode)
         LL_DMA_DisableIT_HT(priv->DMAx, priv->dma_chnum);
         LL_DMA_DisableIT_TC(priv->DMAx, priv->dma_chnum);
     }
-    else if (new_mode == ADC_OPMODE_IDLE) {
+    else if (new_mode == ADC_OPMODE_IDLE || new_mode == ADC_OPMODE_REARM_PENDING) {
-        dbg("ADC switch -> IDLE");
+        dbg("ADC switch -> IDLE or IDLE/REARM_PENDING");
         // IDLE and ARMED are identical with the exception that the trigger condition is not checked
         // ARMED can be only entered from IDLE, thus we do the init only here.
 
@@ -314,8 +326,10 @@ void UADC_SwitchMode(Unit *unit, enum uadc_opmode new_mode)
     }
     else if (new_mode == ADC_OPMODE_ARMED) {
         dbg("ADC switch -> ARMED");
-        assert_param(priv->opmode == ADC_OPMODE_IDLE);
+        assert_param(priv->opmode == ADC_OPMODE_IDLE || priv->opmode == ADC_OPMODE_REARM_PENDING);
-        // there's nothing else to do here
+
+        // avoid firing immediately by the value jumping across the scale
+        priv->trig_prev_level = priv->last_samples[priv->trigger_source];
     }
     else if (new_mode == ADC_OPMODE_TRIGD ||
         new_mode == ADC_OPMODE_STREAM ||

units/adc/_adc_internal.h

@@ -13,7 +13,8 @@
 
 enum uadc_opmode {
     ADC_OPMODE_UNINIT, //!< Not yet switched to any mode
-    ADC_OPMODE_IDLE,   //!< Idle, each sample overwrites the previous. Allows immediate value readout and averaging.
+    ADC_OPMODE_IDLE,   //!< Idle. Allows immediate value readout and averaging.
+    ADC_OPMODE_REARM_PENDING, //!< Idle, waiting for the next sample to re-arm (auto trigger).
     ADC_OPMODE_ARMED,  //!< Armed for a trigger. Direct access and averaging are disabled.
     ADC_OPMODE_TRIGD,  //!< Triggered, sending pre-trigger and streaming captured data.
     ADC_OPMODE_FIXCAPT,//!< Capture of fixed length without a trigger

units/adc/unit_adc.c

@@ -109,16 +109,20 @@ static error_t UADC_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, P
          */
         case CMD_SETUP_TRIGGER:
             dbg("> Setup trigger");
-            if (priv->opmode != ADC_OPMODE_IDLE && priv->opmode != ADC_OPMODE_ARMED) return E_BUSY;
+            if (priv->opmode != ADC_OPMODE_IDLE &&
+                priv->opmode != ADC_OPMODE_ARMED &&
+                priv->opmode != ADC_OPMODE_REARM_PENDING) {
+                return E_BUSY;
+            }
 
             {
-                uint8_t source = pp_u8(pp);
+                const uint8_t source = pp_u8(pp);
-                uint16_t level = pp_u16(pp);
+                const uint16_t level = pp_u16(pp);
-                uint8_t edge = pp_u8(pp); // TODO test falling edge and dual edge
+                const uint8_t edge = pp_u8(pp);
-                uint16_t pretrig = pp_u16(pp); // TODO test pre-trigger ...
+                const uint16_t pretrig = pp_u16(pp); // TODO test pre-trigger ...
-                uint32_t count = pp_u32(pp);
+                const uint32_t count = pp_u32(pp);
-                uint16_t holdoff = pp_u16(pp); // TODO test hold-off ...
+                const uint16_t holdoff = pp_u16(pp);
-                bool auto_rearm = pp_bool(pp);
+                const bool auto_rearm = pp_bool(pp);
 
                 if (source > 17) {
                     com_respond_str(MSG_ERROR, frame_id, "Invalid trig source");
@@ -141,7 +145,7 @@ static error_t UADC_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, P
                 }
 
                 // XXX the max size may be too much
-                uint16_t max_pretrig = (priv->dma_buffer_itemcount / priv->nb_channels);
+                const uint16_t max_pretrig = (priv->dma_buffer_itemcount / priv->nb_channels);
                 if (pretrig > max_pretrig) {
                     com_respond_snprintf(frame_id, MSG_ERROR,
                                          "Pretrig too large (max %d)", (int) max_pretrig);
@@ -164,17 +168,28 @@ static error_t UADC_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, P
          */
         case CMD_ARM:
             dbg("> Arm");
-            if(priv->opmode != ADC_OPMODE_IDLE) return E_BUSY;
+            uint8_t sticky = pp_u8(pp);
+
+            if(priv->opmode == ADC_OPMODE_ARMED || priv->opmode == ADC_OPMODE_REARM_PENDING) {
+                // We are armed or will re-arm promptly, act like the call succeeded
+                // The auto flag is set regardless
+            } else {
+                if (priv->opmode != ADC_OPMODE_IDLE) {
+                    return E_BUSY; // capture in progress
+                }
 
                 if (priv->trig_len == 0) {
                     com_respond_str(MSG_ERROR, frame_id, "Trigger not configured.");
                     return E_FAILURE;
                 }
 
-            // avoid firing immediately by the value jumping across the scale
-            priv->trig_prev_level = priv->last_samples[priv->trigger_source];
-
                 UADC_SwitchMode(unit, ADC_OPMODE_ARMED);
+            }
+
+            if (sticky != 255) {
+                priv->auto_rearm = (bool)sticky;
+            }
+
             return E_SUCCESS;
 
         /**
@@ -182,13 +197,21 @@ static error_t UADC_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, P
          * Switches to idle.
          */
         case CMD_DISARM:
-            // TODO test
             dbg("> Disarm");
+
+            priv->auto_rearm = false;
+
             if(priv->opmode == ADC_OPMODE_IDLE) {
                 return E_SUCCESS; // already idle, success - no work to do
             }
+
             // capture in progress
-            if(priv->opmode != ADC_OPMODE_ARMED) return E_BUSY;
+            if (priv->opmode != ADC_OPMODE_ARMED &&
+                priv->opmode != ADC_OPMODE_REARM_PENDING) {
+                // Capture in progress, we already cleared auto rearm, so we're done for now
+                // auto_rearm is checked in the EOS isr and if cleared, does not re-arm.
+                return E_SUCCESS;
+            }
 
             UADC_SwitchMode(unit, ADC_OPMODE_IDLE);
             return E_SUCCESS;
@@ -197,9 +220,11 @@ static error_t UADC_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, P
          * Abort any ongoing capture and dis-arm.
          */
         case CMD_ABORT:;
-            // TODO test
             dbg("> Abort capture");
+            {
                 enum uadc_opmode old_opmode = priv->opmode;
+
+                priv->auto_rearm = false;
                 UADC_SwitchMode(unit, ADC_OPMODE_IDLE);
 
                 if (old_opmode == ADC_OPMODE_FIXCAPT ||
@@ -207,6 +232,7 @@ static error_t UADC_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, P
                     old_opmode == ADC_OPMODE_TRIGD) {
                     UADC_ReportEndOfStream(unit);
                 }
+            }
             return E_SUCCESS;
 
         /**
@@ -214,13 +240,17 @@ static error_t UADC_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, P
          * The reported edge will be 0b11, here meaning "manual trigger"
          */
         case CMD_FORCE_TRIGGER:
-            // TODO test
             dbg("> Force trigger");
-            if(priv->opmode == ADC_OPMODE_IDLE) {
+            // This is similar to block capture, but includes the pre-trig buffer and has fixed size based on trigger config
-                com_respond_str(MSG_ERROR, frame_id, "Not armed");
+            // FORCE is useful for checking if the trigger is set up correctly
+            if (priv->opmode != ADC_OPMODE_ARMED &&
+                priv->opmode != ADC_OPMODE_IDLE &&
+                priv->opmode != ADC_OPMODE_REARM_PENDING) return E_BUSY;
+
+            if (priv->trig_len == 0) {
+                com_respond_str(MSG_ERROR, frame_id, "Trigger not configured.");
                 return E_FAILURE;
             }
-            if(priv->opmode != ADC_OPMODE_ARMED) return E_BUSY;
 
             UADC_HandleTrigger(unit, 0b11, PTIM_GetMicrotime());
             return E_SUCCESS;
@@ -234,7 +264,8 @@ static error_t UADC_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, P
         case CMD_BLOCK_CAPTURE:
             // TODO test
             dbg("> Block cpt");
-            if(priv->opmode != ADC_OPMODE_ARMED &&
+            if (priv->opmode != ADC_OPMODE_ARMED &&
+                priv->opmode != ADC_OPMODE_REARM_PENDING &&
                 priv->opmode != ADC_OPMODE_IDLE) return E_BUSY;
 
             uint32_t count = pp_u32(pp);
@@ -249,7 +280,8 @@ static error_t UADC_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, P
         case CMD_STREAM_START:
             // TODO test
             dbg("> Stream ON");
-            if(priv->opmode != ADC_OPMODE_ARMED &&
+            if (priv->opmode != ADC_OPMODE_ARMED &&
+                priv->opmode != ADC_OPMODE_REARM_PENDING &&
                 priv->opmode != ADC_OPMODE_IDLE) return E_BUSY;
 
             UADC_StartStream(unit, frame_id);
@@ -261,7 +293,7 @@ static error_t UADC_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, P
         case CMD_STREAM_STOP:
             // TODO test
             dbg("> Stream OFF");
-            if(priv->opmode != ADC_OPMODE_STREAM) {
+            if (priv->opmode != ADC_OPMODE_STREAM) {
                 com_respond_str(MSG_ERROR, frame_id, "Not streaming");
                 return E_FAILURE;
             }