Kinetis Motor SuiteのトピックRe: LPUART instance FRDM-KE16Z

LPUART instance FRDM-KE16Z

malina — Fri, 15 Mar 2024 13:23:43 GMT

Hi! I am using FRDM-KE16Z for a project. I tried to use LPUART0 and LPUART1 (LPUART2 is already used for another purpose), but I cannot find the proper pin on Arduino outputs. I only need the RX pin for LPUART. I already saw that the LPUART0_RX is PTB0 and LPUART1_RX is PTC6, but when I connect the wire and try to establish the connection, it gets a framing error. I tested my code on LPUART2, and it works.

Re: LPUART instance FRDM-KE16Z

Pavel_Hernandez — Sat, 16 Mar 2024 00:44:37 GMT

Hello, my name is Pavel, and I will be supporting your case, I recommend reviewing the schematic of this board the UART0 is not available, because is used by the MK20 and routed on the board, that why is not available on the Arduino pins.

But maybe you could use these other pins.

Best regards,
Pavel

Re: LPUART instance FRDM-KE16Z

malina — Sun, 17 Mar 2024 17:45:13 GMT

Unfortunately, I am already using the PTA3 pin as SDA for I2C.

Re: LPUART instance FRDM-KE16Z

Pavel_Hernandez — Wed, 20 Mar 2024 02:22:52 GMT

Hello, I am afraid is not possible to use those pins that you want, because are not available.

Best regards,
Pavel

Re: LPUART instance FRDM-KE16Z

malina — Wed, 20 Mar 2024 13:21:00 GMT

I tried to use PTC6 as RX for LPUART1 by switching the R30 jumper resistance to R31 as shown in the schematics.

It doesn't work. The pinout on the backwards of the development board and the schematics don't match. For example, on J1 in the schematics is PTC6 and on the backward of my development board is PTC8(which doesn't exist in the schematics).

Re: LPUART instance FRDM-KE16Z

Pavel_Hernandez — Wed, 20 Mar 2024 22:09:57 GMT

Hello, oh! you are right, but I checked the output of the R31 and has continuity with pin 2 of J1, there is an error on the silkscreen.

Best regards,
Pavel

Re: LPUART instance FRDM-KE16Z

malina — Thu, 21 Mar 2024 07:28:03 GMT

Still...it doesn't solve the problem. The pin 2 of J1 (PTC6) doesn't work as RX for LPUART1, as it should.

Re: LPUART instance FRDM-KE16Z

Pavel_Hernandez — Thu, 21 Mar 2024 22:52:30 GMT

Hello, I reviewed the Schematic again could you try without the pull-up resistor? If this does not work, I will test it on my side.

Best regards,
Pavel