LPC Microcontrollers中的主题 Re: LPC55S36, config FLEXCOMM pins to Arduino header, half the pins don't work.

LPC55S36, config FLEXCOMM pins to Arduino header, half the pins don't work.

bell_huang — Tue, 23 Jan 2024 08:09:08 GMT

In i2c_polling_b2b_master example, it configures FLEXCOMM2 as I2C bus.

SCL: Pin77, PIO1_25, connect to Arduino header pins J102[7]; J122[12].

SDA: Pin68, PIO1_26, connect to Arduino header pins J92[6]; J122[6].

I can receive signals from Arduino header pins J122[12] & J122[6]. However, I cannot receive signals from J102[7] & J92[6]. How can I configure to switch signal pairs to receive signals from J102[7] and J92[6]?

In a similar situation, I change to configure FLEXCOMM3 as I2C bus.

SCL: Pin81, PIO0_2, connect to Arduino header pins J102[3], J92[20].

SDA: Pin84, PIO0_3, connect to Arduino header pins J102[13], J92[18].

I can receive signals from J102[3] & J102[13], cannot receive from J92[20] & J92[18]. How can I switch to receive from J92[20] & J92[18]?

Board: LPC55S36-EVK (LPCXpresso55S36 Development Board, rev D)

SDK:

https://mcuxpresso.nxp.com/en/builder?hw=LPCXpresso55S36

Document: LPCXpresso55S36UM

https://www.nxp.com/docs/en/user-manual/LPCXpresso55S36UM.pdf

Re: LPC55S36, config FLEXCOMM pins to Arduino header, half the pins don't work.

xiangjun_rong — Wed, 24 Jan 2024 01:57:57 GMT

Hi,

On the LPC5536-EVK board.

For the pin J92[20] P0_2-FC3_TXD_SCL_MISO_WS, you have to close pin 1&2 of JP41, and close pin2&3 of JP61.

For the J92[18] P0_3-FC3_RXD_SDA_MOSI_DATA, you have to close pin1&2 of JP44, and close pin2&3 of JP62.

Pls have a try

XiangJun Rong

Re: LPC55S36, config FLEXCOMM pins to Arduino header, half the pins don't work.

bell_huang — Thu, 25 Jan 2024 08:03:22 GMT

Hi Xiangjun,

Thanks. Your tips helped me figure out how the MCU pins, jumpers and Motor/Arduino connector pins work.

In i2c_polling_b2b_master example which using FLEXCOMM2,

Both J122[6] and J92[6] have SDA signal.

JP52 Pins 1-2 shorted => J122[12] has SCL signal.

JP52 Pins 2-3 shorted => J102[7] has SCL signal.