uRock

This is a Project about Digital Guitar Effect Pedal running on ARM Cortex-M4. 1.1 version featuring better sound quality. Curent version require more external compoents. For minimal cost, reference to 0.1 build.

本專案是基於ARM Cortex-M4F的開源吉他效果器 1.1版著重在聲音品質提升，需要較多的外部原件 若您想要用做簡單的方式製作，可以參考0.1版

The Source Code for

• Effects : src/audio-effects/ and src/spu.c
• Ui control : src/ui/

程式碼架構

• 效果：src/audio-effects/ and src/spu.c
• 使用者界面：src/ui

Presentations & Dev-Reference / 發表會簡報與開發記錄

• http://www.slideshare.net/zongfanyang/sitcon2015-slides-open

• http://www.slideshare.net/zongfanyang/urokc-jserv-course-final

• http://urock.hackpad.com

The Hardware to evaluate this code / 製作本效果器所需的硬體

• STM32F429I-DISCOVERY
• Self build ADC/DAC board with PCM4201 and PCM1754
• Self build ultra low noise power supply with TPS4A7000

Both ADC and DAC are set to operate at 96kHz sampling rate.

For ADC

• ADC is sampling at 24bits.
• Master mode
• On STM32F429I port SAI1

For DAC

• DAC is output at 16bits.
• Slave mode
• On STM32F429I port SAI2

ADC and DAC shared BCK, LRCK and SCK

Full Schematic will be released soon

• STM32F429I-DISCOVERY
• 自製 ADC/DAC 轉換板(PCM4201/PCM1754)
• 自制超低底噪電源模組(TPS4A74000)

線路圖將在整理後公開

The software require to build / 如何組建這份軟體

• make
• arm-gcc-none-eabi 4.8 with hard floating point support, Suggest to Linaro Version 2014q2
• openocd or st-flash

Tested on MAC OSX and Ubuntu 14.14 with linaro gcc build

• make
• arm-gcc-none-eabi 4.8 需要支援hard floating，建議使用Linaro版本(2014q2)
• openocd or st-flash

已經在Mac OSX與Ubuntu 14.14測試成功

The building Process / 組建流程

1. make

2. plug development board

3. make openocd_flash or make flash

4. Done

5. make

6. 插上開發版

7. make openocd_flash 或 make flash

8. 完成

Free or OpenSource Sofware included as Library / 以引入作為函式庫的開源與自由軟體

FreeRTOS STM32 Cube Firmware uGFX ARM DSP Library FATFS

License / 授權

This software is licensed under MIT license, be free to modify, reuse or redistribute.

For futhuer notice please reference the LICENSE file.

本軟體使用MIT授權，可自由修改，使用或是發佈

更多資訊請詳見LICENSE檔案

• System Design: Chung-Fan Yang(sonicyang)
• Signal Processing: sonicyang, Hao-Yi Chih(anarchih)
• GUI: sonicyang, The KK
• Housing: sonicyang, Chih-lin Lee(Shinshipower)
• Art design: 大中天

Copyright (c) 2014,2015