Difference between revisions of "Peripherals Summary"
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= Overview = | = Overview = | ||
| − | This article pretends | + | This article pretends introduce the capabilities of most used peripherals in IGEPv2, with a brief explanation and program examples to make easy to learning it.<br> |
= Feedback and Contributing = | = Feedback and Contributing = | ||
Revision as of 12:46, 24 November 2011
Contents
Overview
This article pretends introduce the capabilities of most used peripherals in IGEPv2, with a brief explanation and program examples to make easy to learning it.
Feedback and Contributing
At any point, if you see a mistake you can contribute to this How-To.
Peripherals
UART
UART (universal asynchronous receiver/transmitter) convert parallel data from system bus to serial data through a port. At the destination, a second UART re-assembles this data. Each UART contains a shift register which is the fundamental method of conversion between serial and parallel forms. External signals may be of many different forms, IGEPv2 can handle RS232 and RS485 but not all pads have these standards, Omap UART peripheral use CMOS level voltage (1V8). Omap UART peripheral use four signals:
- UART TX: Transmit signal.
- UART RX: Receive signal.
- UART RTS: Ready to send, used in RS485 and unidirectional communication.
- UART CTS: Clear to send, used in RS485 and unidirectional communication.
The speed transmion data is mesured in bauds per second, for example Kernel console params uses 115200 bps (equivalent to 14 Kbytes per second). The speed can set up from 300 bauds to 3686400 bauds.
More information: http://en.wikipedia.org/wiki/Universal_asynchronous_receiver/transmitter
GPIO
GPIO (General Purpose Input/Output) is a generic pin on a chip whose behavior (including whether it is an input or output pin) can be controlled (programmed) through software. Some Omap GPIO characteristics are:
- Set the data input and output direction
- Configure GPIO pin to high or low states.
- Configure GPIO pins for interrupt control
- Enable and disable interrupts
- Enable and disable wakeup capability per GPIO pin.
Omap use CMOS voltage levels (1V8) and the pads are connected directly to it.
More information go:
- http://en.wikipedia.org/wiki/GPIO
- http://omappedia.org/wiki/GPIO
How to use GPIOs Example: What can I do with IGEP0020#How_to_handle_the_gpio-LED.27s
SPI
Under construction
BSP
Under contruction
MMC
Under contruction
I2C
Under construction
