Switch & LED using TMS320C6745 DSP

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LED & Switch Interfaceusing TMS320C6745

https://www.pantechsolutions.net/products/dsp-dsc-boards/tms320c6745-tyro

Features of GPIO

The GPIO peripheral consists of the following features

• Separate input/output registers

• All GPIO signals can be used as interrupt sources

• All GPIO signals can be used to generate events to the EDMA.

Led Connection to C6745

GPIO Registers

GPIO Address

GPIO Direction Registers (DIRn)

By default, all the GPIO pins are configured as inputs(bit value = 1)

1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0F 0 0 0

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1F F F F

0xF000FFFF

GPIO Output Data Registers (OUT_DATAn)

0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 10 F F F

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0

0x0FFF00000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0

0x00000000

STEPS FOR LED BLINKING

Declare two pointer variables for GPIO Direction register and GPIO Data Register

Set Byte Address for GPIO Direction register and GPIO Data Register

Configure GPIO as output in GPIO Direction Register

Configure Required Blinking data in GPIO Data Register

Set Base Address

• gpio_dir01 = (Uint32 *)0x01E26010;• gpio_out_data01 = (Uint32 *)0x01E26014;

Configure Direction register as Output*gpio_dir01 = 0xF000FFFF;

Configure Data register as Output

*gpio_out_data01 = 0x0FFF0000;

DIP SWITCH INTERFACE

GPIO Input Data Registers (IN_DATAn)

Program#define Uint32 unsigned int

Uint32 Value,i;

void DelayMs(Uint32 Ms);

void main()

Uint32 *gpio_in_data01,*gpio_out_data01,*gpio_dir01;

gpio_in_data01 = (Uint32 *)0x01E26020;

gpio_dir01 = (Uint32 *)0x01E26010;

gpio_out_data01 = (Uint32 *)0x01E26014;

*gpio_dir01 = 0xF000FFFF;

while(1)

Value = *gpio_in_data01;

*gpio_out_data01 = Value<<16;

DelayMs(100);

void DelayMs(Uint32 Ms)

Uint32 i;

while(Ms>0)

for(i=0;i<30000;i++);

For more details

– www.pantechsolutions.net

– http://www.slideshare.net/pantechsolutions

– http://www.scribd.com/pantechsolutions

– http://www.youtube.com/pantechsolutions

Switch & LED using TMS320C6745 DSP

Education