ledctrl
This project is currently under development.
*** Hardware block diagram ***
+---------------------------------------------------------+
| +---------+ |
+24V+-------------->+ 5V/3A | |
| |step-down| |
| +---------+ +----------------+ |
| | Raspberry Pi | |
+----+ | +-------+ | Zero | |
|LCD | | | level | +----------------+ | +----+
|1602+<-----------+->+shifter+<-+->+I2C|SPI|GPIO|USB+---------------->+Wifi|
+----+ | | +-------+ ^ +-----+--+--+----+ | +----+
| | | ^ | ^ |
| | +-------+ | | | | | +----+
| | | RTC | | | | +----------------------+rot |
| | | DS3132+<-+ | v reset | |knob|
| | +-------+ +-----|-----+ | +----+
| | |stm32|f103 | |
| | | v | |
| | | +-+-+ | |
| | | |SPI| | |
| | | +---+ | |
| | | |DMA| | |
| | | +-+-+ | |
| | | v | |
| | +-----+-----+ |
| | |DMA|DMA|DMA| |
| | +-----------+ |
| | |TIM|TIM|TIM| |
| | +-----------+ |
| | |PORTB 16Bit| |
| | +-----+-----+ |
| | | |
| |i2c bus | 16 bit parallel |
| +-----+ +---------+ |
| | | |
| +------------|--------------------------|-----------+ |
| | | 8 bit | 8 bit | |
| | +----+----+ +----+----+ | |
| | v v v v | |
| | +---+---------+---+ enable +--+---------+--+ | |
| | |PCF8574 |PCF8574 +-------->+74LS125|74LS125| | |
| | |Expander|Expander| |Buffer |Buffer | | |
| | +---+---------+---+ +--+--------+---+ | |
| | | 8 bit v 8 bit v | | |
| | +-------->+ +<-------+ | |
| | 16 channel | | 16 channel | |
| | enable | | led data | |
| | | | | |
| +-----------------|----------------|----------------+ |
| | | ledctrl |
| | | |
+--------------------|----------------|-------------------+
| | ledctrl_carrier
| v
| +---+----+
v |opto |
16x +----+----+ |coupler |
+24V+------------------>+16x | +---+----+
|isolated | | | | isolation
|relays | | | | barrier
................................|....................
. |in groups| | v |
+---+----+ 5V |of 4 | +---+----+
|24V/5V +--->+ | | MAX481 |
+24V+---->+DC-DC | +----+----+ | Tx |
|isolated| | +---+----+
+---+----+ | | | |
. | | v |
. | 16x | +-+--+ |16x
. +------------->+RJ45| |ledctrl_output
. +24V | |8p8c| |in groups of 4
. +-+-+--+-+
. | 16x patch cable
. | RS485 Signal
. | 24V Power
. v
. +-------+-+--+-----------+
. | +24V |RJ45| |
. | +---+8p8c+-------+ |
. | | +----+ | |
. | v v |
. +---+-----+ +5V +--+---+
. | 5V/3A +------>+MAX481|16x
. |step-down| | Rx |ledctrl_driver
. +---+-----+-------+--+---+
. | |
. +5V| |led data
. | |
. | +----------+ |
. +->+ WS2812 +<-+
. |LED-Stripe|
. +----------+
. 16x Stripes
. à ~50 LEDs
*** Software block diagram ***
+-----------------------------------+------------------------+
| kernel space . user space |
| . |
+----------------+ . +--------------------+
| stm32led.ko | . | server |
| | . | |
+----+ +---------+ char dev . | +---------+
|GPIO| |3*16*cols| /dev/stm32led . | |4*16*cols|
|pin | | bytes +<--------------------------------+ bytes |
+--+-+ | buffer | . | | buffer |
| | +----+----+ . | +----+----+
| | | | . | ^ |
| | v | +---------+ . +-------+ | |
| | +----+----+ |port | . | sysfs | +---+----+
| | |remap RGB| |expander +<------+ GPIO +<--+JSON-RPC|
| | +----+----+ |GPIO pins| . |control| | server |
| | | | +---+-----+ . +-------+---+--------+ +------+
| | v | | . ^ | |remote|
| | +----+----+ | . socket port +----->+client|
| | |spidev0.0| | . v | +------+
| | +----+----+ | . +--+---+
| | | | | . |local |
| | | | | . |client|
+--|--------|----+--------|---------+-----------------+------+
| | | Raspberry Pi Zero
| | | PiCore Linux
|reset |spi data | enable data
v v |
++------+-+-+-------+ |
| |SPI| | v
| +---+ |
| |DMA| |
| +-+-+ |
| | |
| v |
| +----+----+ |
| |3*16*cols| |
| | bytes | |
| | buffer | |
| +----+----+ |
| | |
| v |
| +-----+-----+ |
| |DMA|DMA|DMA| |
| +-----------+ |
| |TIM|TIM|TIM| |
| +-----------+ |
| |PORTB 16bit| | STM32F103
+---+-----+-----+---+
|
v
led data
Credits:
http://www.cnblogs.com/shangdawei/p/4762035.html
https://github.com/hmng/jsonrpc-c