move external stuff to ext

ext/sdcard.h

@@ -0,0 +1,78 @@
+/**
+ * Original source code from https://github.com/carlk3/no-OS-FatFS-SD-SPI-RPi-Pico
+ * 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.
+ * 
+ */
+
+#pragma once
+
+#include <pico/stdlib.h>
+#include <pico/stdio.h>
+#include <string.h>
+#include "my_debug.h"
+#include "f_util.h"
+#include "ff.h"
+#include "sd_card.h"
+#include "diskio.h"
+#include "rtc.h"
+
+void spi_dma_isr();
+
+static spi_t spis[]={
+    {
+        .hw_inst=spi1,
+        .miso_gpio=12,
+        .mosi_gpio=15,
+        .sck_gpio=14,
+        .baud_rate=12500*1000,
+        .dma_isr=spi_dma_isr
+    }
+};
+
+static sd_card_t sd_cards[]={
+    {
+        .pcName="0:",
+        .spi=&spis[0],
+        .ss_gpio=13,
+        .use_card_detect=false,
+        .m_Status=STA_NOINIT
+    }
+};
+
+void spi_dma_isr() {
+    spi_irq_handler(&spis[0]);
+}
+
+size_t sd_get_num() {
+    return count_of(sd_cards);
+}
+
+sd_card_t *sd_get_by_num(size_t num) {
+    if (num<=sd_get_num()) {
+        return &sd_cards[num];
+    } else {
+        return NULL;
+    }
+}
+
+size_t spi_get_num() {
+    return count_of(spis);
+}
+
+spi_t *spi_get_by_num(size_t num) {
+    if (num <= sd_get_num()) {
+        return &spis[num];
+    } else {
+        return NULL;
+    }
+}