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项目作者： anachrocomputer

项目描述 ：
Direct Digital Synthesis via an MCP4822 SPI DAC on a PIC32MX550F256L. Should also work on other PIC32MX chips with similar peripherals, e.g. PIC32MX250F256L.
高级语言： C
项目地址: git://github.com/anachrocomputer/PIC32DDS.git
创建时间： 2019-01-17T23:44:43Z
项目社区：https://github.com/anachrocomputer/PIC32DDS
开源协议：
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PIC32DDS

Generate audio-frequency signals from an MCP4822 dual 12-bit DAC
connected via SPI to a PIC32MX550F256L.
SPI2 clock at 2MHz, SPI3 clock at 1MHz.
New samples sent to DAC at 44.1kHz.
SPI3 connects to an OLED display module, 128x64 pixel,
based on the SSD1306 chip.
SYNC pin set HIGH at beginning of synthesised waveform cycle and LOW
at the end.

DAC connections:

Signal Chip Name Pin Chip Name Pin
SCK2 PIC32 RG6/SCK2 10 MCP4822 SCK 3
MOSI2 PIC32 RC13/SDO2 73 MCP4822 SDI 4
SS2 PIC32 RD9 69 MCP4822 CS 2

OLED display connections:

Signal Chip Name Pin Chip Name Pin
SCK3 PIC32 RF13/SCK3 39 SSD1306 SCK 3
MOSI3 PIC32 RG8/SDO3 12 SSD1306 SDA 4
SS3 PIC32 RA0 17 SSD1306 CS 7
DC PIC32 RG9 14 SSD1306 DC 6
RES PIC32 RE8 18 SSD1306 RES 5

Digital output:

  • SYNC RD0 pin 72

Debugging LEDs on dev board:

  • LED1 RE6 pin 4
  • LED2 RE7 pin 5
  • LED3 RE1 pin 94
  • LED4 RA7 pin 91
  • LED5 RA6 pin 92

PIC32 pin numbers are for the 100-pin package.

LEDs light when the pin is pulled LOW.

PIC32 Toolchain

MPLAB X V5.20 and ‘xc32’ V2.15. These are quite old versions now, so I really ought to upgrade!

PIC32 Programmer

Microchip ICD3. Other programmers should work, e.g. ICD4 or PICkit4.