ARM audio fixes, stack size increase (#2365)

* fix up arm audio implementation

* chibios stack size inc

* get one channel working

* update for chibios

2 files changed, 231 insertions, 51 deletions

diff --git a/quantum/audio/audio_arm.c b/quantum/audio/audio_arm.c
index 43c8d67c48..247dc337d5 100644
--- a/quantum/audio/audio_arm.c
+++ b/quantum/audio/audio_arm.c
@@ -77,23 +77,48 @@ bool glissando = true;
 #endif
 float startup_song[][2] = STARTUP_SONG;
 
-static void gpt_cb6(GPTDriver *gptp);
-static void gpt_cb7(GPTDriver *gptp);
 static void gpt_cb8(GPTDriver *gptp);
 
+#define DAC_BUFFER_SIZE 360
+
+#define START_CHANNEL_1() gptStart(&GPTD6, &gpt6cfg1); \
+    gptStartContinuous(&GPTD6, 2U)
+#define START_CHANNEL_2() gptStart(&GPTD7, &gpt7cfg1); \
+    gptStartContinuous(&GPTD7, 2U)
+#define STOP_CHANNEL_1() gptStopTimer(&GPTD6)
+#define STOP_CHANNEL_2() gptStopTimer(&GPTD7)
+#define RESTART_CHANNEL_1() STOP_CHANNEL_1(); \
+    START_CHANNEL_1()
+#define RESTART_CHANNEL_2() STOP_CHANNEL_2(); \
+    START_CHANNEL_2()
+#define UPDATE_CHANNEL_1_FREQ(freq) gpt6cfg1.frequency = freq * DAC_BUFFER_SIZE; \
+    RESTART_CHANNEL_1()
+#define UPDATE_CHANNEL_2_FREQ(freq) gpt7cfg1.frequency = freq * DAC_BUFFER_SIZE; \
+    RESTART_CHANNEL_2()
+#define GET_CHANNEL_1_FREQ gpt6cfg1.frequency
+#define GET_CHANNEL_2_FREQ gpt7cfg1.frequency
+
+
 /*
  * GPT6 configuration.
  */
+// static const GPTConfig gpt6cfg1 = {
+//   .frequency    = 1000000U,
+//   .callback     = NULL,
+//   .cr2          = TIM_CR2_MMS_1,    /* MMS = 010 = TRGO on Update Event.    */
+//   .dier         = 0U
+// };
+
 GPTConfig gpt6cfg1 = {
-  .frequency    = 440,
-  .callback     = gpt_cb6,
+  .frequency    = 440U*DAC_BUFFER_SIZE,
+  .callback     = NULL,
   .cr2          = TIM_CR2_MMS_1,    /* MMS = 010 = TRGO on Update Event.    */
   .dier         = 0U
 };
 
 GPTConfig gpt7cfg1 = {
-  .frequency    = 440,
-  .callback     = gpt_cb7,
+  .frequency    = 440U*DAC_BUFFER_SIZE,
+  .callback     = NULL,
   .cr2          = TIM_CR2_MMS_1,    /* MMS = 010 = TRGO on Update Event.    */
   .dier         = 0U
 };
@@ -105,15 +130,169 @@ GPTConfig gpt8cfg1 = {
   .dier         = 0U
 };
 
-static void gpt_cb6(GPTDriver *gptp) {
-    palTogglePad(GPIOA, 4);
+
+/*
+ * DAC test buffer (sine wave).
+ */
+// static const dacsample_t dac_buffer[DAC_BUFFER_SIZE] = {
+//   2047, 2082, 2118, 2154, 2189, 2225, 2260, 2296, 2331, 2367, 2402, 2437,
+//   2472, 2507, 2542, 2576, 2611, 2645, 2679, 2713, 2747, 2780, 2813, 2846,
+//   2879, 2912, 2944, 2976, 3008, 3039, 3070, 3101, 3131, 3161, 3191, 3221,
+//   3250, 3278, 3307, 3335, 3362, 3389, 3416, 3443, 3468, 3494, 3519, 3544,
+//   3568, 3591, 3615, 3637, 3660, 3681, 3703, 3723, 3744, 3763, 3782, 3801,
+//   3819, 3837, 3854, 3870, 3886, 3902, 3917, 3931, 3944, 3958, 3970, 3982,
+//   3993, 4004, 4014, 4024, 4033, 4041, 4049, 4056, 4062, 4068, 4074, 4078,
+//   4082, 4086, 4089, 4091, 4092, 4093, 4094, 4093, 4092, 4091, 4089, 4086,
+//   4082, 4078, 4074, 4068, 4062, 4056, 4049, 4041, 4033, 4024, 4014, 4004,
+//   3993, 3982, 3970, 3958, 3944, 3931, 3917, 3902, 3886, 3870, 3854, 3837,
+//   3819, 3801, 3782, 3763, 3744, 3723, 3703, 3681, 3660, 3637, 3615, 3591,
+//   3568, 3544, 3519, 3494, 3468, 3443, 3416, 3389, 3362, 3335, 3307, 3278,
+//   3250, 3221, 3191, 3161, 3131, 3101, 3070, 3039, 3008, 2976, 2944, 2912,
+//   2879, 2846, 2813, 2780, 2747, 2713, 2679, 2645, 2611, 2576, 2542, 2507,
+//   2472, 2437, 2402, 2367, 2331, 2296, 2260, 2225, 2189, 2154, 2118, 2082,
+//   2047, 2012, 1976, 1940, 1905, 1869, 1834, 1798, 1763, 1727, 1692, 1657,
+//   1622, 1587, 1552, 1518, 1483, 1449, 1415, 1381, 1347, 1314, 1281, 1248,
+//   1215, 1182, 1150, 1118, 1086, 1055, 1024,  993,  963,  933,  903,  873,
+//    844,  816,  787,  759,  732,  705,  678,  651,  626,  600,  575,  550,
+//    526,  503,  479,  457,  434,  413,  391,  371,  350,  331,  312,  293,
+//    275,  257,  240,  224,  208,  192,  177,  163,  150,  136,  124,  112,
+//    101,   90,   80,   70,   61,   53,   45,   38,   32,   26,   20,   16,
+//     12,    8,    5,    3,    2,    1,    0,    1,    2,    3,    5,    8,
+//     12,   16,   20,   26,   32,   38,   45,   53,   61,   70,   80,   90,
+//    101,  112,  124,  136,  150,  163,  177,  192,  208,  224,  240,  257,
+//    275,  293,  312,  331,  350,  371,  391,  413,  434,  457,  479,  503,
+//    526,  550,  575,  600,  626,  651,  678,  705,  732,  759,  787,  816,
+//    844,  873,  903,  933,  963,  993, 1024, 1055, 1086, 1118, 1150, 1182,
+//   1215, 1248, 1281, 1314, 1347, 1381, 1415, 1449, 1483, 1518, 1552, 1587,
+//   1622, 1657, 1692, 1727, 1763, 1798, 1834, 1869, 1905, 1940, 1976, 2012
+// };
+
+// squarewave
+static const dacsample_t dac_buffer[DAC_BUFFER_SIZE] = {
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0,  0,  0,  0,  0,  0,
+   0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+   0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+   0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+    0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+   0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+   0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+   0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+   0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+// squarewave
+static const dacsample_t dac_buffer_2[DAC_BUFFER_SIZE] = {
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+  2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047,
+
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0,  0,  0,  0,  0,  0,
+   0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+   0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+   0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+    0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+   0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+   0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+   0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+   0,  0,  0,  0,  0,  0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+/*
+ * DAC streaming callback.
+ */
+size_t nx = 0, ny = 0, nz = 0;
+static void end_cb1(DACDriver *dacp, dacsample_t *buffer, size_t n) {
+
+  (void)dacp;
+
+  nz++;
+  if (dac_buffer == buffer) {
+    nx += n;
+  }
+  else {
+    ny += n;
+  }
+
+  if ((nz % 1000) == 0) {
+    // palTogglePad(GPIOD, GPIOD_LED3);
+  }
 }
 
+/*
+ * DAC error callback.
+ */
+static void error_cb1(DACDriver *dacp, dacerror_t err) {
+
+  (void)dacp;
+  (void)err;
 
-static void gpt_cb7(GPTDriver *gptp) {
-    palTogglePad(GPIOA, 5);
+  chSysHalt("DAC failure");
 }
 
+static const DACConfig dac1cfg1 = {
+  .init         = 2047U,
+  .datamode     = DAC_DHRM_12BIT_RIGHT
+};
+
+static const DACConversionGroup dacgrpcfg1 = {
+  .num_channels = 1U,
+  .end_cb       = end_cb1,
+  .error_cb     = error_cb1,
+  .trigger      = DAC_TRG(0)
+};
+
+static const DACConfig dac1cfg2 = {
+  .init         = 2047U,
+  .datamode     = DAC_DHRM_12BIT_RIGHT
+};
+
+static const DACConversionGroup dacgrpcfg2 = {
+  .num_channels = 1U,
+  .end_cb       = end_cb1,
+  .error_cb     = error_cb1,
+  .trigger      = DAC_TRG(0)
+};
+
 void audio_init()
 {
 
@@ -128,8 +307,30 @@ void audio_init()
     // audio_config.raw = eeconfig_read_audio();
     audio_config.enable = true;
 
-    palSetPadMode(GPIOA, 4, PAL_MODE_OUTPUT_PUSHPULL);
-    palSetPadMode(GPIOA, 5, PAL_MODE_OUTPUT_PUSHPULL);
+  /*
+   * Starting DAC1 driver, setting up the output pin as analog as suggested
+   * by the Reference Manual.
+   */
+  palSetPadMode(GPIOA, 4, PAL_MODE_INPUT_ANALOG);
+  palSetPadMode(GPIOA, 5, PAL_MODE_INPUT_ANALOG);
+  dacStart(&DACD1, &dac1cfg1);
+  dacStart(&DACD2, &dac1cfg2);
+
+  /*
+   * Starting GPT6 driver, it is used for triggering the DAC.
+   */
+  START_CHANNEL_1();
+  START_CHANNEL_2();
+
+  /*
+   * Starting a continuous conversion.
+   */
+  dacStartConversion(&DACD1, &dacgrpcfg1,
+                     (dacsample_t *)dac_buffer, DAC_BUFFER_SIZE);
+  dacStartConversion(&DACD2, &dacgrpcfg2,
+                     (dacsample_t *)dac_buffer_2, DAC_BUFFER_SIZE);
+  // gptStartContinuous(&GPTD6, 2U);
+
 
     audio_initialized = true;
 
@@ -193,8 +394,8 @@ void stop_note(float freq)
             voice_place = 0;
         }
         if (voices == 0) {
-            gptStopTimer(&GPTD6);
-            gptStopTimer(&GPTD7);
+            STOP_CHANNEL_1();
+            STOP_CHANNEL_2();
             gptStopTimer(&GPTD8);
             frequency = 0;
             frequency_alt = 0;
@@ -224,20 +425,6 @@ float vibrato(float average_freq) {
 
 #endif
 
-static void restart_gpt6(void) {
-    // gptStopTimer(&GPTD6);
-
-    gptStart(&GPTD6, &gpt6cfg1);
-    gptStartContinuous(&GPTD6, 2U);
-}
-
-static void restart_gpt7(void) {
-    // gptStopTimer(&GPTD7);
-
-    gptStart(&GPTD7, &gpt7cfg1);
-    gptStartContinuous(&GPTD7, 2U);
-}
-
 static void gpt_cb8(GPTDriver *gptp) {
     float freq;
 
@@ -280,13 +467,10 @@ static void gpt_cb8(GPTDriver *gptp) {
                         freq_alt = 30.52;
                     }
 
-                    if (gpt6cfg1.frequency != (uint16_t)freq_alt) {
-                        gpt6cfg1.frequency = freq_alt;
-                        restart_gpt6();
+                    if (GET_CHANNEL_2_FREQ != (uint16_t)freq_alt) {
+                        UPDATE_CHANNEL_2_FREQ(freq_alt);
                     }
                     //note_timbre;
-                } else {
-                    // gptStopTimer(&GPTD6);
                 }
 
             if (polyphony_rate > 0) {
@@ -342,13 +526,10 @@ static void gpt_cb8(GPTDriver *gptp) {
             }
 
 
-            if (gpt7cfg1.frequency != (uint16_t)freq) {
-                gpt7cfg1.frequency = freq;
-                restart_gpt7();
+            if (GET_CHANNEL_1_FREQ != (uint16_t)freq) {
+                UPDATE_CHANNEL_1_FREQ(freq);
             }
             //note_timbre;
-        } else {
-            // gptStopTimer(&GPTD7);
         }
     }
 
@@ -370,11 +551,9 @@ static void gpt_cb8(GPTDriver *gptp) {
             freq = voice_envelope(freq);
 
 
-            if (gpt6cfg1.frequency != (uint16_t)freq) {
-                gpt6cfg1.frequency = freq;
-                restart_gpt6();
-                gpt7cfg1.frequency = freq;
-                restart_gpt7();
+            if (GET_CHANNEL_1_FREQ != (uint16_t)freq) {
+                UPDATE_CHANNEL_1_FREQ(freq);
+                UPDATE_CHANNEL_2_FREQ(freq);
             }
             //note_timbre;
         } else {
@@ -384,8 +563,8 @@ static void gpt_cb8(GPTDriver *gptp) {
 
         note_position++;
         bool end_of_note = false;
-        if (gpt6cfg1.frequency > 0) {
-            if (!note_resting) 
+        if (GET_CHANNEL_1_FREQ > 0) {
+            if (!note_resting)
                 end_of_note = (note_position >= (note_length*16 - 1));
             else
                 end_of_note = (note_position >= (note_length*16));
@@ -399,8 +578,8 @@ static void gpt_cb8(GPTDriver *gptp) {
                 if (notes_repeat) {
                     current_note = 0;
                 } else {
-                    gptStopTimer(&GPTD6);
-                    gptStopTimer(&GPTD7);
+                    STOP_CHANNEL_1();
+                    STOP_CHANNEL_2();
                     // gptStopTimer(&GPTD8);
                     playing_notes = false;
                     return;
@@ -459,7 +638,8 @@ void play_note(float freq, int vol) {
 
         gptStart(&GPTD8, &gpt8cfg1);
         gptStartContinuous(&GPTD8, 2U);
-            
+        RESTART_CHANNEL_1();
+        RESTART_CHANNEL_2();
     }
 
 }
@@ -492,8 +672,8 @@ void play_notes(float (*np)[][2], uint16_t n_count, bool n_repeat)
 
         gptStart(&GPTD8, &gpt8cfg1);
         gptStartContinuous(&GPTD8, 2U);
-        restart_gpt6();
-        restart_gpt7();
+        RESTART_CHANNEL_1();
+        RESTART_CHANNEL_2();
     }
 
 }
diff --git a/tmk_core/chibios.mk b/tmk_core/chibios.mk
index df9fa84981..1cd0146fe0 100644
--- a/tmk_core/chibios.mk
+++ b/tmk_core/chibios.mk
@@ -6,7 +6,7 @@
 # Stack size to be allocated to the Cortex-M process stack. This stack is
 # the stack used by the main() thread.
 ifeq ($(USE_PROCESS_STACKSIZE),)
-  USE_PROCESS_STACKSIZE = 0x200
+  USE_PROCESS_STACKSIZE = 0x800
 endif
 
 # Stack size to the allocated to the Cortex-M main/exceptions stack. This