Plan to use UART with TWR-K70 Kit for application. Would prefer cpu UART0.
One UART (cpu UART2, cpu SCH signals PTE16/PTE17, ELEV pins A44/A43 via R116/R115) is routed to TWR-SER board and should be used for debug/conio purpose.
I see one other UART on cpu board tower pins: Cpu UART3, cpu SCH signals PTF8/PTF7, ELEV pins A42/A41 via R135/R134. R135 and R134 have attribut "DNP" (do not place).
1. So to get cpu UART3 Rx/Tx to work: Simply have to place these '0 ohm resistors'/wires ?
2. As PTF8/PTF7 also are connected to 'LCD_D4/LCD_D3': May still use UART3 with active LCD board mounted?
3. See Cpu UART0 (preferred) connected to cpu SCH signals PTF18/PTF17. These are connected to LCD_D14/LCD_D13. Can use them with LCD dismounted?
4. Any other suggestion for second/application UART on this kit?
Best regards, Juergen.
Hi
1. If customer want to use UART3 at PTF7/PTF8 pins, it need to use TWR-SER2 board instead of TWR-SER board.
2. The PTF7/PTF8 pin with multiple-function, which could affect the LCD display when using both pin for UART communication.
3. Both TWR-SER and TWR-SER2 boards don't provide RS232 PHY connection with PTF17/PTF18 pin, there couldn't use PTF17/PTF18 for UART function.
4. Based on previous analysis, customer could use PTF7/PTF8 of K70 UART3 with TWR-SER2 board with LCD board unmounted.
Wish it helps.
About TWR-SER2 board info, please check below link:
Enhanced Serial (Dual Ethernet, High-Speed US|Freescale
Have a great day,
best regards,
Ma Hui
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Ok, have not been exact enough in description.
Want to build second application UART port onto a TWR-PROTO board. This second UART is TTL-UART, so do not need RS-232 PHY. TWR is populated with TWR-K70 cpu board, TWR-SER board and TWR-PROTO board. May like to have TWR-LCD too, but can live without it. Can omit TWR-SER, as 'printf' could be catched via USB too.
Need advice, which UART port of cpu board to use (would prefer UART0).
Summary for TWR-K70F120M cpu board (please tell, if wrong):
There are 4 possible UART(-Rx-Tx) default pin pairs on TWR-ELEV boards (I call them "twre_UARTx" in contrast to "cpu_UARTx"):
"twre_UART0" is connected to "cpu_UART2"
"twre_UART1" is connected to "cpu_UART3" (if 0 Ohm bridges R134/R135 would be placed)
"twer_UART2" is not connected to cpu
"twer_UART3" is not connected to cpu.
Prefer using "cpu_UART0". Possible TWR-ELEV pins for "cpu_UART0_RX/TX" are:
PTF17/PTF18
PTA1/PTA2
PTA15/PTA16
PTB16/PTB17
PTD6/PTD7.
Think that PTF17/PTF18 (secondary connector D53/D54) is best to catch "cpu_UART0_RX/TX" on a TWR-PROTO board.
Seems to have lowest conflict potential with other TWR boards. Do you agree?
Best regards, Juergen.
Hi Juergen,
For K70 product provide Graphic LCD controller, if customer consider to use TWR-LCD-RGB board?
About TWR-LCD-RGB info, please check below link:
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=TWR-LCD-RGB&tid=m32TWR
If using TWR-LDC baord, the PTF17/PTF18 is prefer pins for K70 UART0.
If using TWR-LCD-RGB board, Customer could consider to use PTA14/PTA15 or PTB16/PTB17 or PTD6/PTD7 as K70 UART0 pins.
Wish it helps.
Have a great day,
best regards,
Ma Hui
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Note: If this post answers your question, please click the Correct Answer button. Thank you!
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