I would wish that an extra set of along side each location of the GPIO ,
LCD, JTAG & +5V GND Power Sip pin holes could be masked off and allow for
inexpensive 2 & 4 Layer expansion / interface board . cost is way more to
get custom cables to route in an enclosure... and take to much time to
assemble..
-T
The LCD and Expansion already allow for add-on board as does the JTAG header. Having an extra set of holes where there are already holes does not seem to add a lot of value. what exactly are you wanting to do that the current holes won’t accomplish?
Thank you!
Gerald
Gerald Coley wrote:
We are looking to add some PWM signals to the expansion connector. This
will be valuable for robotics and other functions. We are considering
two different ways to accomplish this. Our goal is to make this as
non-disruptive as possible and to have a zero cost impact.The current plan is to replace the following pins on the OMAP3530 with
different pins that will not change the available functions on those
expansion pins, but it will add the PWM signals to them. One side affect
is that the pin muxing will change for these pins on the Rev C. There
are ID pins on the REV C board that will allow the SW to identify if the
board is a REV C or REV B.
Already any details available how this identification can be done?
I.e. register and value(s)?
Based on that reading the drivers could set
the pin muxing accordingly to make the pins be in the correct mode. No
functionality is lost because of this change. Below are the affected
signals:
*CURRENT ASSIGNMENTS*
* EXP Pin 4:
McBSP3_DX UART2_CTS GPIO_140
OMAP Pin:AE6
* EXP PIN 6:
McBSP3_CLKX UART2_TX GPIO_142
OMAP Pin: AF5
* EXP PIN 8:
McBSP3_FSX UART2_RX GPIO_143
OMAP Pin: AE5
*NEW ASSIGNMENTS*
* EXP PIN 4:
UART2_CTS McBSP3_DX gpt9_pwm_evt GPIO_144
OMAP Pin: AB26
* EXP PIN 6:
UART2_TX McBSP3_CLKX gpt11_pwm _evt GPIO_146
OMAP Pin: AA25
* EXP PIN 8:
UART2_RX McBSP3_FSX gpt8_pwm_evt GPIO_147
OMAP Pin: AD25
Is this the configuration now used with revision C1?
Dirk
We are still testing, but there are two GPIO pins, GPIO_171 and GPIO_172. As long as both pins are grounded, then the board is a Rev C2.
The changes we ended up with for Rev C2 are:
Pin 4 added GPT9_PWMEVT…OMAP3530 pin AB26
Pin 6 added GPT10_PWMEVT…OMAP3530 pin AB25
Pin 10 added GPT11_PWMEVT…OMAP3530 pin AA25
Gerald