make sound work

2025-08-16 23:06:15 +02:00
parent b71c83a5ca
commit f7c5959b0a
58 changed files with 25933 additions and 25820 deletions
@@ -0,0 +1,116 @@
+/* rtc.c
+Copyright 2021 Carl John Kugler III
+
+Licensed under the Apache License, Version 2.0 (the License); you may not use 
+this file except in compliance with the License. You may obtain a copy of the 
+License at
+
+   http://www.apache.org/licenses/LICENSE-2.0 
+Unless required by applicable law or agreed to in writing, software distributed 
+under the License is distributed on an AS IS BASIS, WITHOUT WARRANTIES OR 
+CONDITIONS OF ANY KIND, either express or implied. See the License for the 
+specific language governing permissions and limitations under the License.
+*/
+#include <stdio.h>
+#include <time.h>
+//
+#include "hardware/rtc.h"
+#include "pico/stdio.h"
+#include "pico/stdlib.h"
+#include "pico/util/datetime.h"
+//
+#include "ff.h"
+#include "util.h"  // calculate_checksum
+//
+#include "rtc.h"
+
+static time_t epochtime;
+
+// Make an attempt to save a recent time stamp across reset:
+typedef struct rtc_save {
+    uint32_t signature;
+    datetime_t datetime;
+    uint32_t checksum;  // last, not included in checksum
+} rtc_save_t;
+static rtc_save_t rtc_save __attribute__((section(".uninitialized_data")));
+
+static void update_epochtime() {
+    bool rc = rtc_get_datetime(&rtc_save.datetime);
+    if (rc) {
+        rtc_save.signature = 0xBABEBABE;
+        struct tm timeinfo = {
+            .tm_sec = rtc_save.datetime
+                          .sec, /* Seconds.	[0-60] (1 leap second) */
+            .tm_min = rtc_save.datetime.min,          /* Minutes.	[0-59] */
+            .tm_hour = rtc_save.datetime.hour,        /* Hours.	[0-23] */
+            .tm_mday = rtc_save.datetime.day,         /* Day.		[1-31] */
+            .tm_mon = rtc_save.datetime.month - 1,    /* Month.	[0-11] */
+            .tm_year = rtc_save.datetime.year - 1900, /* Year	- 1900.  */
+            .tm_wday = 0,                             /* Day of week.	[0-6] */
+            .tm_yday = 0,                             /* Days in year.[0-365]	*/
+            .tm_isdst = -1                            /* DST.		[-1/0/1]*/
+        };
+        rtc_save.checksum = calculate_checksum((uint32_t *)&rtc_save,
+                                               offsetof(rtc_save_t, checksum));
+        epochtime = mktime(&timeinfo);
+        rtc_save.datetime.dotw = timeinfo.tm_wday;
+        // configASSERT(-1 != epochtime);
+    }
+}
+
+time_t time(time_t *pxTime) {
+    update_epochtime();
+    if (pxTime) {
+        *pxTime = epochtime;
+    }
+    return epochtime;
+}
+
+void time_init() {
+    rtc_init();
+    datetime_t t = {0, 0, 0, 0, 0, 0, 0};
+    rtc_get_datetime(&t);
+    if (!t.year && rtc_save.datetime.year) {
+        uint32_t xor_checksum = calculate_checksum(
+            (uint32_t *)&rtc_save, offsetof(rtc_save_t, checksum));
+        if (rtc_save.signature == 0xBABEBABE &&
+            rtc_save.checksum == xor_checksum) {
+            // Set rtc
+            rtc_set_datetime(&rtc_save.datetime);
+        }
+    }
+}
+
+// Called by FatFs:
+DWORD get_fattime(void) {
+    datetime_t t = {0, 0, 0, 0, 0, 0, 0};
+    bool rc = rtc_get_datetime(&t);
+    if (!rc) return 0;
+
+    DWORD fattime = 0;
+    // bit31:25
+    // Year origin from the 1980 (0..127, e.g. 37 for 2017)
+    uint8_t yr = t.year - 1980;
+    fattime |= (0b01111111 & yr) << 25;
+    // bit24:21
+    // Month (1..12)
+    uint8_t mo = t.month;
+    fattime |= (0b00001111 & mo) << 21;
+    // bit20:16
+    // Day of the month (1..31)
+    uint8_t da = t.day;
+    fattime |= (0b00011111 & da) << 16;
+    // bit15:11
+    // Hour (0..23)
+    uint8_t hr = t.hour;
+    fattime |= (0b00011111 & hr) << 11;
+    // bit10:5
+    // Minute (0..59)
+    uint8_t mi = t.min;
+    fattime |= (0b00111111 & mi) << 5;
+    // bit4:0
+    // Second / 2 (0..29, e.g. 25 for 50)
+    uint8_t sd = t.sec / 2;
+    fattime |= (0b00011111 & sd);
+    return fattime;
+}