Vybrid GPIO setting speed

marioturqueti · ‎10-14-2016

I'm using vybrid MVF61NS151CMK50 with MQX 4.2

Setting a GPIO direct in the vybrid registers:

uint32_t *GPIO4PSOR =(uint32_t*)0x400FF104; //Port Set Output Reg (GPIO4_PSOR)

uint32_t *GPIO4PCOR =(uint32_t*)0x400FF108; //Port Clear Output Reg (GPIO4_PCOR)

*GPIO4PCOR = 0x00000005;

*GPIO4PSOR = 0x00000005;

I check the pin level and takes something like 100ns to goes down and up again…

I set the pin config to 200MHz:

temp1 = 0x000038B2; //original:0x00000062

*IOMUXCPTE23 =temp1; //Soft MUX Pad Control Reg 128 (IOMUXC_PTE23)

*IOMUXCPTE24 =temp1;

*IOMUXCPTE25 =temp1;

Why it takes so long? Is it 100ns the maximum GPIOs speed (1->0->1)? @Can I change pin voltage levels faster?

Yuri · ‎10-19-2016

Hello,

You may look at app note AN5078 (Influence of Pin Setting on System
Function and Performance) regarding parameters of the Pad Control Registers,

and play with different settings.

Have a great day,

Yuri

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