Power Management中的主题 Re: How to drive FS26 via LPSPI3?

How to drive FS26 via LPSPI3?

Allen_863 — Fri, 19 Dec 2025 06:16:57 GMT

I am using the S32K3X4EVB-T172 for development.

I discovered that I couldn't communicate with the FS26 using LPSPI3, and then I replicated this situation in the example code.

I want to replace

LPSPI3_PCS0 = 110 = PTB17 <> LPSPI0_PCS0 = 95 = PTB0
LPSPI3_SCK = 7 = PTD1 <> LPSPI3_SCK = 7 = PTD1
LPSPI3_SIN = 111 = PTD20 <> LPSPI0_SIN = 97 = PTC9
LPSPI3_SOUT = 8 = PTD0 <> LPSPI0_SOUT = 94 = PTB1

The wiring method is as follows:

LPSPI3_SCK = J37, number 1, connects to LPSPI0_SCK = J2, number 21
LPSPI3_SIN = J39, number 14, connects to LPSPI0_SIN = J2, number 15
LPSPI3_SOUT = J37, number 3, connects to LPSPI0_SOUT = J2, number 18
LPSPI3_PCS0 = J4, number 5, connects to LPSPI0_PCS0 = J2, number 24

The known failure point is that Sbc_fs26_GetDeviceState within Sbc_fs26_InitDevice returns FS_STATES_INVALID.

However, if I use Spi_SyncTransmit, I find that CSB is pulled low, which seems to be correct.

CSB

MOSI

I've checked the configuration, and I can't see where the problem is. The attached file is almost identical to the example code, except that LPSPI0 has been changed to LPSPI3.

Re: How to drive FS26 via LPSPI3?

guoweisun — Mon, 22 Dec 2025 04:14:09 GMT

HI Allen

您这个属于code移植吗？

Re: How to drive FS26 via LPSPI3?

Allen_863 — Mon, 22 Dec 2025 04:26:23 GMT

不是 CODE 移植，是我有一包 CODE 很大包，我在上面遇到了 LPSPI3 无法与 FS26 沟通的问题，为了方便提问，我用 FS26 的范例代码，把它从 LPSPI0 改成 LPSPI3 和 FS26 沟通，但是也遇到无法用 LPSPI3 与 FS26 沟通的状况，但是呼叫 Spi_SyncTransmit 又可以看到 CSB 与 MOSI 有相对应的反应，所以不知道原因是什麽 ?

Re: How to drive FS26 via LPSPI3?

guoweisun — Mon, 22 Dec 2025 04:29:25 GMT

那我们的官方example是用的哪个SPI 跟FS26通信的？

Re: How to drive FS26 via LPSPI3?

Allen_863 — Mon, 22 Dec 2025 04:34:58 GMT

使用 LPSPI0
LPSPI0_PCS0 = 95 = PTB0
LPSPI0_SCK = 98 = PTC8
LPSPI0_SIN = 97 = PTC9
LPSPI0_SOUT = 94 = PTB1

Re: How to drive FS26 via LPSPI3?

Allen_863 — Mon, 22 Dec 2025 04:50:05 GMT

使用 LPSPI0
我有把 LPSPI0 删除，然后进行以下的对接
LPSPI0_PCS0 = 95 = PTB0 = J2 上 24 对接 LPSPI3_PCS0 = 110 = PTB17 = J4 下 5
LPSPI0_SCK = 98 = PTC8 = J2 上 21 对接 LPSPI3_SCK = 7 = PTD1 = J37 上 1
LPSPI0_SIN = 97 = PTC9 = J2 上 15 对接 LPSPI3_SIN = 111 = PTD20 = J39 中 14
LPSPI0_SOUT = 94 = PTB1 = J2 上 18 对接 LPSPI3_SOUT = 8 = PTD0 = J37 上 3
但是 FS26 会无法沟通

Re: How to drive FS26 via LPSPI3?

guoweisun — Tue, 23 Dec 2025 00:29:41 GMT

Please note that during the Christmas holiday period, our support response times may be longer than usual. Thank you for your understanding.

我看了您的描述是在做一个SPI 通信移植在我们的RTD上，确实有点超出support的范围了