Gpio 40 pin outs explanation

[sribangaram]

Dear Friends I have a one data acquisition and controlling board that have 40 pin Connector and diagram also but I didn't Understand pin outs I am Attaching that image Please explain anybody that pin outs

 

[rogerynt]

Hi Sribangaram,

The pins are multifunction function pins that are set by program. In other word, you can appoint these pins to one of the defined function. But, you cannot use same pin with different function simultaneously

GPIOs : they are general purpose I/O pins. These pins may be pull_down, pull_high or floating during reset.

1.) ( pin12 ) use as GPIO or PCM_clk or PWM

For PCM case, you will need to group with

PCM_CLK : pcm clock ( pin 12 )
PCM_DIN : pcm data out ( pin 38 )
PCM_DOUT : pcm data in ( pin 40 )
PCM_FS : pcm frame sync ( pin 35 )

Pin 8, 10 : can use as UART

UART_TxD : UART Tx data
UART_RxD : UART Rx data

Pin19, 21, 23 : for SPI

MOSI : SPI data input
MISO : SPI data out
SCLK : SPI clock signal

They work as a group

pin27, 28 ( I2C )

SDA0 : Group 0 Serial data
SCL0 : Group 0 Serial clock

pin3, 5 ( I2C )

SDA1 : Group 1 Serial data
SCL1 : Group 1 Serial clock

Roger