first commit

Former-commit-id: 0384f53

Author: schollz

.gitignore

@@ -1,6 +1,6 @@
 # Prerequisites
 *.d
-
+pico-extras*
 # Object files
 *.o
 *.ko

CMakeLists.txt

@@ -0,0 +1,60 @@
+# Set minimum required version of CMake
+cmake_minimum_required(VERSION 3.12)
+
+# Pull in PICO SDK (must be before project)
+include(pico_sdk_import.cmake)
+
+# We also need PICO EXTRAS
+include(pico_extras_import.cmake)
+
+
+# Set name of project (as PROJECT_NAME) and C/C++ standards
+project(picocore C CXX ASM)
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
+
+# Creates a pico-sdk subdirectory in our project for the libraries
+pico_sdk_init()
+
+# Tell CMake where to find the executable source file
+add_executable(${PROJECT_NAME} 
+    main.c
+    hw_config.c
+)
+
+# Tell CMake where to find other source code
+add_subdirectory(lib/my_pico_audio)
+add_subdirectory(lib/my_pico_audio_i2s)
+add_subdirectory(lib/sdio build)
+
+# Create map/bin/hex/uf2 files
+pico_add_extra_outputs(${PROJECT_NAME})
+
+# Link to pico_stdlib (gpio, time, etc. functions)
+target_link_libraries(${PROJECT_NAME} 
+    pico_stdlib
+    my_pico_audio_i2s
+    FatFs_SPI
+    hardware_clocks
+    hardware_adc
+)
+
+# target_compile_options(command_line PUBLIC -Wall -Wextra -Wno-unused-function -Wno-unused-parameter)
+# target_compile_options(${PROJECT_NAME} PUBLIC -Wall -Wextra -Wno-unused-parameter)
+
+# This program is useless without standard standard input and output.
+# add_compile_definitions(USE_PRINTF USE_DBG_PRINTF)
+add_compile_definitions(USE_PRINTF)
+
+set_property(TARGET ${PROJECT_NAME} APPEND_STRING PROPERTY LINK_FLAGS "-Wl,--print-memory-usage")
+
+# Enable usb output, disable uart output
+pico_enable_stdio_usb(${PROJECT_NAME} 1)
+pico_enable_stdio_uart(${PROJECT_NAME} 1)
+
+target_compile_definitions(${PROJECT_NAME} PRIVATE
+    #define for our example code
+    USE_AUDIO_I2S=1
+)
+
+pico_add_extra_outputs(${PROJECT_NAME})

Makefile

@@ -0,0 +1,26 @@
+dobuild: pico-extras build
+	cd lib && python3 biquad.py > biquad.h
+	cd build && PICO_EXTRAS_PATH=pico-extras make
+
+pico-extras:
+	git clone https://github.com/raspberrypi/pico-extras.git
+	cd pico-extras && git submodule update -i 
+
+upload: dobuild
+	./dev/upload.sh 
+
+build:
+	rm -rf build
+	mkdir build
+	cd build && cmake ..
+	cd build && make -j32
+	echo "build success"
+
+audio:
+	sox lib/audio/amen_5c2d11c8_beats16_bpm170.flac -c 1 --bits 16 --encoding signed-integer --endian little amen_bpm170.wav
+	sox lib/audio/amen_0efedaab_beats8_bpm165.flac -c 1 --bits 16 --encoding signed-integer --endian little amen_bpm165.wav
+
+clean:
+	rm -rf build
+	rm -rf *.wav
+

README.md

@@ -1,2 +1,18 @@
-# zeptocore
-zeptocore
+## pinout
+
+### pcm5102
+
+```
+GPIO13 -> DIN
+GPIO14 -> BCK
+GPIO15 -> LCK
+```
+
+## todo
+
+- [x] reverse audio (needs doing)
+- [x] re-reverse audio 
+- [x] get number of beats
+- [ ] reverse audio -> problem when phase drops to 0
+- [ ] low-pass filter (needs troubleshooting)
+- [ ] re-reverse audio fx

dev/upload.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+while true
+do
+if mount | grep RPI-RP2 > /dev/null; then
+	sleep 0.5
+	echo "uploading!"
+	time pv -batep build/picocore.uf2 > /media/zns/RPI-RP2/picocore.uf2
+	exit
+fi
+sleep 0.1
+done

hw_config.c

@@ -0,0 +1,89 @@
+/* hw_config.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.
+*/
+/*
+
+This file should be tailored to match the hardware design.
+
+There should be one element of the spi[] array for each hardware SPI used.
+
+There should be one element of the sd_cards[] array for each SD card slot.
+The name is should correspond to the FatFs "logical drive" identifier.
+(See http://elm-chan.org/fsw/ff/doc/filename.html#vol)
+The rest of the constants will depend on the type of
+socket, which SPI it is driven by, and how it is wired.
+
+*/
+
+#include <string.h>
+//
+#include "my_debug.h"
+//
+#include "hw_config.h"
+//
+#include "ff.h" /* Obtains integer types */
+//
+#include "diskio.h" /* Declarations of disk functions */
+
+// Hardware Configuration of SPI "objects"
+// Note: multiple SD cards can be driven by one SPI if they use different slave
+// selects.
+static spi_t spis[] = {
+    // One for each SPI.
+};
+
+// Hardware Configuration of the SD Card "objects"
+static sd_card_t sd_cards[] = {  // One for each SD card
+    {
+        .pcName = "0:",  // Name used to mount device
+        .type = SD_IF_SDIO,
+        /*
+        Pins CLK_gpio, D1_gpio, D2_gpio, and D3_gpio are at offsets from pin
+        D0_gpio. The offsets are determined by sd_driver\SDIO\rp2040_sdio.pio.
+            CLK_gpio = (D0_gpio + SDIO_CLK_PIN_D0_OFFSET) % 32;
+            As of this writing, SDIO_CLK_PIN_D0_OFFSET is 30,
+              which is -2 in mod32 arithmetic, so:
+            CLK_gpio = D0_gpio -2.
+            D1_gpio = D0_gpio + 1;
+            D2_gpio = D0_gpio + 2;
+            D3_gpio = D0_gpio + 3;
+        */
+        .sdio_if = {.CMD_gpio = 18,
+                    .D0_gpio = 19,
+                    .SDIO_PIO = pio1,
+                    .DMA_IRQ_num = DMA_IRQ_0},
+        .use_card_detect = true,
+        .card_detect_gpio = 16,  // Card detect
+        .card_detected_true = 1  // What the GPIO read returns when a card is
+                                 // present.
+    }};
+
+/* ********************************************************************** */
+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 <= spi_get_num()) {
+    return &spis[num];
+  } else {
+    return NULL;
+  }
+}
+
+/* [] END OF FILE */

lib/array_resample.h

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+#define INTERPOLATE_VALUE 512
+int16_t *array_resample_linear(int16_t *arr, int16_t arr_size,
+                               int16_t newSize) {
+  int16_t *newArray;
+  newArray = malloc(sizeof(int16_t) * newSize);
+
+  uint32_t stepSize = (arr_size - 1) * INTERPOLATE_VALUE / (newSize - 1);
+
+  for (int16_t i = 0; i < newSize; i++) {
+    uint32_t index = (i * stepSize) / INTERPOLATE_VALUE;
+    int32_t frac = (i * stepSize) - (index * INTERPOLATE_VALUE);
+    // printf("stepSize: %d, i: %d, index: %d, frac: %d, arr[index]: %d\n",
+    //        stepSize, i, index, frac, arr[index]);
+    if (index < arr_size - 1) {
+      int32_t x = ((int32_t)arr[index] * (INTERPOLATE_VALUE - frac)) +
+                  ((int32_t)arr[index + 1] * frac);
+      // round to nearest interpolate value
+      // printf("%d, x: %d\n", i, x);
+      int16_t round_int = x / INTERPOLATE_VALUE;
+      if (x % INTERPOLATE_VALUE > INTERPOLATE_VALUE / 2) {
+        round_int++;
+      }
+      newArray[i] = round_int;
+    } else {
+      newArray[i] = arr[arr_size - 1];
+    }
+  }
+  return newArray;
+}

lib/audio/amen_0efedaab_beats8_bpm165.flac.REMOVED.git-id

@@ -0,0 +1 @@
+c0964f4026830b8ed51507c614ae275f65a0d83f

lib/audio/amen_5c2d11c8_beats16_bpm170.flac.REMOVED.git-id

@@ -0,0 +1 @@
+a4979bcaed9759f4a6498799f67dc203dee2d9fa