+
+/*
+ * 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);
+ }