AM3356: GPIO bare-metal code

Alex Greenberg

Part Number: AM3356

I need bare simple metal code to set/clear M18 gpio0[1]

0 Pavel Botev over 6 years ago

Hi Alex,

Do you use AM335x TI board (EVM, StarterKit, ICE, BBB) or custom board?

For how to set/clear GPIO pin (bare metal) example, you can refer to AM335x TI PSDK RTOS package:

You can refer to AM335x EVM, gpio1[23] example, and reuse this code for gpio0[1] pin.

pdk_am335x_1_0_15/packages/ti/board/diag/buzzer/

You can also refer to below AM335x (BBB, ICE, SK) bare metal GPIO LED test:

pdk_am335x_1_0_15/packages/ti/board/diag/led/

Regards,
Pavel

0 Alex Greenberg over 6 years ago in reply to Pavel Botev

Thank you so much for responding Pavel. However, I'm having trouble finding the example(s). Can you send me the URL(s)?

Best Regards,

Alex

0 Alex Greenberg over 6 years ago in reply to Alex Greenberg

Pavel, the API

GPIOSetDirMode(SOC_GPIO_0_REGS, pin number, GPIO_DIRECTION_OUTPUT); This is from TI's gpio.c gpio.h

It is also named GPIODirModeSet elsewhere.

I don't know what pin number to use. I want control M18 .

0 Pavel Botev over 6 years ago in reply to Alex Greenberg

Alex,

In pdk_am335x_1_0_15/packages/ti/board/diag/buzzer//build/evmAM335x/GPIO_Buzzer_config.c, GPIO1_23 T15 pin is defined as:

/* Port and pin number mask for Green LED.
Bits 7-0: Pin number and Bits 15-8: Port number */
#define BUZZER_PIN (0x0217)

Thus we have [7:0] = 0x17 (23) for pin number and [15:8] = 0x2 (port number)

For gpio0_1 you need to have 0x0101 instead of 0x0217.

Check also below e2e thread:

Regards,
Pavel

0 Alex Greenberg over 6 years ago in reply to Pavel Botev

Thank you Pavel, all is well!

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