topic Re: mpc5554 GPIO103 in MPC5xxx

mpc5554 GPIO103

smallyang — Thu, 13 Jun 2024 01:44:42 GMT

mpc5554 gpio103无法做输入换成gpio88可以

mpc5554 gpio103 cannot do input instead of gpio88 can.

simulating SPI by software:

Hardware spi:

亲们，我用gpio103做spi输入死活不行，硬件的代码和软件模拟的代码都不行但是飞线到gpio88用gpio88可以正常通信是初始化有什么问题嘛吗，我看手册上这两个脚不太一样

Dear friends, I use gpio103 to do spi input dead or alive, hardware code and software simulation code are not good, but fly line to gpio88 with gpio88 can normal communication is initialization, is there any problem, I see the manual these two feet are not the same.

Re: mpc5554 GPIO103

lukaszadrapa — Thu, 20 Jun 2024 08:22:14 GMT

Hi @smallyang

what can you see on an oscilloscope? I can see that PCS configuration is not correct:

PCSB are primary functions but PA field here is set to 0. Isn't that caused rather by the chip select?

Regards,

Lukas

Re: mpc5554 GPIO103

smallyang — Sat, 22 Jun 2024 00:57:26 GMT

您好，CS 我是手动选择的因为有两个设备，直接做IO口功能使用的

Hello, I chose CS manually because there are two devices, which can be used directly for IO port function

Re: mpc5554 GPIO103

smallyang — Sat, 22 Jun 2024 00:59:47 GMT

示波器上103引脚有波形只是软件读不到数据

There's a wave on pin 103 on the oscilloscope but the software can't read the data

Re: mpc5554 GPIO103

smallyang — Sat, 22 Jun 2024 04:09:31 GMT