Table of Contents
Overview
In this tutorial, we will learn how to blink the LED using the TMS320F28335 microcontroller.
SOFTWARE:
Code Composer Studio
HARDWARE REQUIRED:
- DSP controller board (TMS320F28335)
- JTAG, XDS100V2 board
Specifications:
TMS320F28335 Microcontrollers
On-chip memory
- 256K × 16 Flash, 34K × 16 SARAM
- Clock frequency: Up to 150 MHz (6.67-ns cycle time)
- Operating voltage: 1.9-V/1.8-V core, 3.3-V I/O design
- Six-channel DMA controller (for ADC, McBSP, ePWM, XINTF, and SARAM)
Communications peripherals
- Up to 2 CAN modules
- Up to 3 SCI (UART) modules
- Up to 2 McBSP modules (configurable as SPI)
- One SPI module
- One Inter-Integrated Circuit (I2C) bus
Analog subsystem
- 12-bit ADC, 16 channels
- 80-ns conversion rate
- 2 × 8 channel input multiplexer
- Two sample-and-hold
- Single/simultaneous conversions
- Internal or external reference
Enhanced control peripherals (EPWM)
- Up to 18 PWM outputs
- Up to 6 HRPWM outputs with 150-ps MEP resolution
•16-bit or 32-bit External Interface (XINTF)
- GPIO0 to GPIO63 pins can be connected to one of the eight external core interrupts
- –Up to 18 PWM outputs
- –Up to 6 HRPWM outputs with 150-ps MEP
Up to 88 individually programmable, multiplexed GPIO pins with input filtering
Three 32-bit CPU timers
THEORY:
LEDs (LEDs) are the most commonly used components, usually to display the digital status of contacts.
The TMS320F28335 board has 4 LEDs connected to general-purpose DSP I / O contacts. The anode of each LED is connected to the ground, and the cathode of each LED is connected to the port via a 220-ohm resistor. To turn on a single LED, set the signal of the corresponding port to high.
General Purpose I / O Peripheral (GPIO) in the TMS320 Digital Signal Processor (DSP). The GPIO peripheral provides special general-purpose contacts that can be configured as inputs or outputs. When configured as an input, we can determine the status of the input by reading the state of the internal register. When configured as an output, we can write to the internal register to monitor the managed state on the output contact.
GPIO Connection
| S.No | GPIO | Control Card |
| 1 | GPIO_3 | GPIO3 |
RESULT:
Hence by the above code, we have blinked the LED with the 1 GPIO Pins.
Final Code For Single Led Blink
/*
* main.c
*
* Created on: 16-Mar-2022
* Author: Admin
*/
#include "DSP28x_Project.h" // Device Headerfile and Examples Include FileS
void main(void)
{
// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP2833x_SysCtrl.c file.
InitSysCtrl();
EALLOW;
GpioCtrlRegs.GPAMUX1.bit.GPIO3=0;
GpioCtrlRegs.GPADIR.bit.GPIO3=1;
GpioCtrlRegs.GPAPUD.bit.GPIO3=0;
EDIS;
while(1)
{
GpioDataRegs.GPATOGGLE.bit.GPIO3=1;
DELAY_US(1000000);
}
}
Final Code For Multiple Led Blink
/*
* main.c
*
* Created on: 16-Mar-2022
* Author: Devilal
*/
#include "DSP28x_Project.h" //Device headerfile
void main(void)
{
InitSysCtrl();
// gpio configuration
EALLOW;
GpioCtrlRegs.GPAMUX1.bit.GPIO1=0; // selecting the gpio pin
GpioCtrlRegs.GPADIR.bit.GPIO1=1; //1 mean output pin,0 mean input pin
GpioCtrlRegs.GPAPUD.bit.GPIO1=0; // input selection completed
GpioCtrlRegs.GPAMUX1.bit.GPIO2=0;// selecting the gpio pin
GpioCtrlRegs.GPADIR.bit.GPIO2=1;//1 mean output pin,0 mean input pin
GpioCtrlRegs.GPAPUD.bit.GPIO2=0;// input selection completed
GpioCtrlRegs.GPAMUX1.bit.GPIO3=0;// selecting the gpio pin
GpioCtrlRegs.GPADIR.bit.GPIO3=1;//1 mean output pin,0 mean input pin
GpioCtrlRegs.GPAPUD.bit.GPIO3=0;// input selection completed
GpioCtrlRegs.GPAMUX1.bit.GPIO4=0;// selecting the gpio pin
GpioCtrlRegs.GPADIR.bit.GPIO4=1;//1 mean output pin,0 mean input pin
GpioCtrlRegs.GPAPUD.bit.GPIO4=0;// input selection completed
GpioCtrlRegs.GPAMUX1.bit.GPIO5=0;// selecting the gpio pin
GpioCtrlRegs.GPADIR.bit.GPIO5=1;//1 mean output pin,0 mean input pin
GpioCtrlRegs.GPAPUD.bit.GPIO5=0;// input selection completed
GpioCtrlRegs.GPAMUX1.bit.GPIO6=0;// selecting the gpio pin
GpioCtrlRegs.GPADIR.bit.GPIO6=1;//1 mean output pin,0 mean input pin
GpioCtrlRegs.GPAPUD.bit.GPIO6=0;// input selection completed
GpioCtrlRegs.GPAMUX1.bit.GPIO7=0;// selecting the gpio pin
GpioCtrlRegs.GPADIR.bit.GPIO7=1;//1 mean output pin,0 mean input pin
GpioCtrlRegs.GPAPUD.bit.GPIO7=0;// input selection completed
GpioCtrlRegs.GPAMUX1.bit.GPIO8=0;// selecting the gpio pin
GpioCtrlRegs.GPADIR.bit.GPIO8=1;//1 mean output pin,0 mean input pin
GpioCtrlRegs.GPAPUD.bit.GPIO8=0;// input selection completed
GpioCtrlRegs.GPAMUX1.bit.GPIO9=0;// selecting the gpio pin
GpioCtrlRegs.GPADIR.bit.GPIO9=1;//1 mean output pin,0 mean input pin
GpioCtrlRegs.GPAPUD.bit.GPIO9=0;// input selection completed
EDIS;
while(1)
{
GpioDataRegs.GPACLEAR.bit.GPIO1=1; // turns on the led;(1 means turn on,0 means turns off)
GpioDataRegs.GPACLEAR.bit.GPIO2=1;// turns on the led;(1 means turn on,0 means turns off)
GpioDataRegs.GPACLEAR.bit.GPIO3=1;// turns on the led;(1 means turn on,0 means turns off)
GpioDataRegs.GPACLEAR.bit.GPIO4=1;// turns on the led;(1 means turn on,0 means turns off)
GpioDataRegs.GPACLEAR.bit.GPIO5=1;// turns on the led;(1 means turn on,0 means turns off)
GpioDataRegs.GPACLEAR.bit.GPIO6=1;// turns on the led;(1 means turn on,0 means turns off)
GpioDataRegs.GPACLEAR.bit.GPIO7=1;// turns on the led;(1 means turn on,0 means turns off)
GpioDataRegs.GPACLEAR.bit.GPIO8=1;// turns on the led;(1 means turn on,0 means turns off)
GpioDataRegs.GPASET.bit.GPIO9=1;// turns on the led;(1 means turn on,0 means turns off)
DELAY_US(1000000); //turns off after a delay of 1000000 microseconds
GpioDataRegs.GPASET.bit.GPIO1=1; // turns off the led (1 means turn off,0 means turns on)
GpioDataRegs.GPASET.bit.GPIO2=1; // turns off the led (1 means turn off,0 means turns on)
GpioDataRegs.GPASET.bit.GPIO3=1; // turns off the led (1 means turn off,0 means turns on)
GpioDataRegs.GPASET.bit.GPIO4=1; // turns off the led (1 means turn off,0 means turns on)
GpioDataRegs.GPASET.bit.GPIO5=1; // turns off the led (1 means turn off,0 means turns on)
GpioDataRegs.GPASET.bit.GPIO6=1; // turns off the led (1 means turn off,0 means turns on)
GpioDataRegs.GPASET.bit.GPIO7=1; // turns off the led (1 means turn off,0 means turns on)
GpioDataRegs.GPASET.bit.GPIO8=1; // turns off the led (1 means turn off,0 means turns on)
GpioDataRegs.GPACLEAR.bit.GPIO9=1; // turns off the led (1 means turn off,0 means turns on)
DELAY_US(1000000); //turns on after a delay of 1000000 microseconds
}
}
