This code is for the TM4C123 launchpad. It was made using CCS V6 with TI compiler. It's to control a WS2812B strip with a single output.
First here is the video of it working:
Then, here it is the code:
/* * This code was made using CCS V6 with TI compiler * It used TivaWare APIs to help coding. It's for the TM4C123 launchpad * * This code is to control a WS2812B strip with 30 LEDs. It only supports 1 single output. It was made for * a hat used in a event. * It cycles through 5 different patterns and it has accepts a digital input in the PF1. When LOW it would * increasse the LEDs brightness to the max, when at HIGH it would set the brightness just to 50 out of 255. * * I won't explain how i made the Patterns, only the WS2812B control. Sorry if some comments are in portuguese. *They are from when i was making the first code. * * */#define PART_TM4C123GH6PM#include <stdint.h>#include <stdbool.h>#include "stdlib.h"#include "inc/hw_ints.h"#include "inc/hw_memmap.h"#include "inc/hw_uart.h"#include "inc/hw_gpio.h"#include "inc/hw_ssi.h"#include "inc/hw_pwm.h"#include "inc/hw_types.h"#include "driverlib/timer.h"#include "driverlib/gpio.h"#include "driverlib/interrupt.h"#include "driverlib/pin_map.h"#include "driverlib/rom.h"#include "driverlib/rom_map.h"#include "driverlib/sysctl.h"#include "driverlib/uart.h"#include "driverlib/udma.h"#include "driverlib/pwm.h"#include "driverlib/ssi.h"#include "driverlib/systick.h"#include <string.h>volatile uint32_t millis=0;#define size 30 //number of LEDs//Needed for some Patterns#define SireneA 10#define SireneP 15 uint8_t Maxbrilho = 50; //Sets the maximum brightness uint32_t values[size]; //Array that stores the values to send to each WS2812B. Each 32bits has the values for the 3 LEDs in a WS2812B//Needed for patterns. A lazy way of making some patterns uint8_t Red[1530]; uint8_t Green[1530]; uint8_t Blue[1530]; uint8_t PadraoInit = 0; //Needed. If the same pattern was being repetead over and over again then some things didn't need to be remade uint8_t MudaPadrao = 0; //This is a flag to say if the button was pressed/* * The folowing are for configuring the systick *///This is the interrupt handler for the SysTickvoid SycTickInt(){ millis++;}//This configures the Systick to interrupt every mili-secondvoid SysTickbegin(){ SysTickPeriodSet(80000); SysTickIntRegister(SycTickInt); SysTickIntEnable(); SysTickEnable();}//This funtion works as a delay. It stops the code for the mili-seconds specified by parametervoid Wait(uint32_t time){ uint32_t temp = millis; while( (millis-temp) < time){ } }/* * End of Systick configurations and functions *//* * This is the interrupt handler for the button that changes the LEDs brightness */void PortFIntHandler(){ uint32_t status=0; status = GPIOIntStatus(GPIO_PORTF_BASE,true); GPIOIntClear(GPIO_PORTF_BASE,status); if( GPIOPinRead(GPIO_PORTF_BASE,GPIO_PIN_1) == 0) Maxbrilho = 255; else Maxbrilho = 50; MudaPadrao = 1;}/* * This configures the SSI. * Setups only the TX and configures the SSI to work at 6.4Mhz and 8bit packets. * It's 6.4Mhz because 6.4Mhz/8 is about 800Khz, the frequency needed for the WS2812B * */void SPIInit(){ // put your setup code here, to run once: SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI0); SysCtlDelay(3); SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA); SysCtlDelay(3); GPIOPinConfigure(GPIO_PA5_SSI0TX); GPIOPinTypeSSI(GPIO_PORTA_BASE, GPIO_PIN_5); SSIIntClear(SSI0_BASE,SSI_TXEOT); SSIConfigSetExpClk(SSI0_BASE, 80000000, SSI_FRF_MOTO_MODE_0,SSI_MODE_MASTER, 6400000, 8); SSIEnable(SSI0_BASE);}/* * This is used to assist changing the value of the LEDs in the array * * I use a uint32_t to save the values of the 3 LEDs. RED starts at the bit8, Green at bit0 and blue at bit16. * It was not the best way to save the values since it wastes 8bits, i should have used 3 arrays of uint8_t but for * some reason i tought it was the best way at the time. I made the base of the code just when i started learning to program the SSI. * First parameter says which WS2812B you want to control, Second it's the color you want to change and lastly it's the value you want it * to be. */int LEDNum=0;int bitNum=23;void changeValue(uint32_t pos, uint8_t color, uint32_t _brightness){ if(color == 'r'){ values[pos] &= ~(0xFF << 8); values[pos] +=(_brightness << 8); } else if(color == 'b'){ values[pos] &= ~(0xFF); values[pos] +=(_brightness); } else if(color == 'g'){ values[pos] &= ~(0xFF << 16); values[pos] += (_brightness << 16); }}/* * This function starts sending new data. * It loads as fast as it can the FIFO. It's bloking so the processor can't do anything else while doing this * It works because the FIFO as multiple data values saved up so when it sends one the processor should be waiting for the * FIFO to have room for more data. * * It converts the values. Remember that we used 6.4Mhz. Each packet of 8bits represents 1bit for the WS2812B. * If a value is 1 then it converts it to 0b11111000 which forms the wave required to send a 1 for the WS2812B, *if it's 0 then it's to 0b11000000 which represents a 0 for the WS2812B. * */void SendData(uint32_t values[],int number){ int k, i; for( k = 0; k < number; k++){ for( i=23; i >= 0; i--){ volatile uint8_t convert = 0xC0 ;//0b11000000; if((values[k] >> i) & 0x1 != 0){ convert = 0xF8;// 0b11111000; } SSIDataPut(SSI0_BASE, convert); } }}/* * This changes the array values all to 0 and sends them, doing so it turns off al the LEDs. */void TurnOFFAll(){ int i; if(PadraoInit==0){ for(i=0; i < size; i+=1){ values[i]=0; } SendData(values,size); }}void Pattern4(){ if(PadraoInit==0){ TurnOFFAll(); PadraoInit=1; } int16_t i; uint16_t p = 0; for(i=0; i <= Maxbrilho; i++){ Red[p] = Maxbrilho; Green[p] = i; Blue[p] = 0; p++; } for(i=Maxbrilho; i >= 0; i--){ Red[p] = i; Green[p] = Maxbrilho; Blue[p] = 0; p++; } for(i=0; i <= Maxbrilho; i++){ Red[p] = 0; Green[p] = Maxbrilho; Blue[p] = i; p++; } for(i=Maxbrilho; i >= 0; i--){ Red[p] = 0; Green[p] = i; Blue[p] = Maxbrilho; p++; } for(i=0; i <= Maxbrilho; i++){ Red[p] = i; Green[p] = 0; Blue[p] = Maxbrilho; p++; } for(i=Maxbrilho; i >= 0; i--){ Red[p] = Maxbrilho; Green[p] = 0; Blue[p] = i; p++; } uint8_t time=7; uint16_t diference=20+(Maxbrilho>>4); uint16_t step=1+(Maxbrilho>>4); uint16_t LedPosition[size]; uint16_t k=0; for(i=0; i <size; i+=1){ LedPosition[i] = k; k+=diference; if(k >= p) k=0; } for(k=0; k < 1000 && MudaPadrao==0; k++){ for(i=0; i < size/2 && MudaPadrao==0; i+=1){ if(LedPosition[i] >= p) LedPosition[i]=0; changeValue(i,'r',Red[LedPosition[i]]); changeValue(i,'g',Green[LedPosition[i]]); changeValue(i,'b',Blue[LedPosition[i]]); changeValue(size-1-i,'r',Red[LedPosition[i]]); changeValue(size-1-i,'g',Green[LedPosition[i]]); changeValue(size-1-i,'b',Blue[LedPosition[i]]); LedPosition[i]+= step; } SendData(values,size); Wait(time); }}void Policia(){ uint8_t brilho = Maxbrilho; int i; if(PadraoInit==0){ TurnOFFAll(); PadraoInit=1; } uint8_t LedPosition[SireneP]; for(i=0; i <SireneP; i++) LedPosition[i] = i; int k; for(k=0; k < 100 && MudaPadrao==0; k++){ for(i=0; i < SireneP && MudaPadrao==0; i+=1){ if(LedPosition[i] >= size) LedPosition[i]=0; changeValue(LedPosition[i],'b',brilho); changeValue(LedPosition[i],'r',0); LedPosition[i]++; } if(LedPosition[0] !=0){ changeValue(LedPosition[0]-1,'b',0); changeValue(LedPosition[0]-1,'r',brilho); } else{ changeValue(size,'b',0); changeValue(size,'r',brilho); } SendData(values,size); Wait(25); }}void Ambulancia(){ uint8_t brilho = Maxbrilho; int i; if(PadraoInit==0){ for(i=0; i < size; i+=1){ values[i]=0; } SendData(values,size); PadraoInit=1; } uint8_t LedPosition[SireneA]; for(i=0; i <SireneA; i++) LedPosition[i] = i; int k; for(k=0; k < 100 && MudaPadrao==0; k++){ for(i=0; i < SireneA && MudaPadrao==0; i+=1){ if(LedPosition[i] >= size) LedPosition[i]=0; changeValue(LedPosition[i],'b',brilho); LedPosition[i]++; } if(LedPosition[0] !=0) changeValue(LedPosition[0]-1,'b',0); else changeValue(size,'b',0); SendData(values,size); Wait(25); }}void Pattern3(){ uint8_t resolution=Maxbrilho; int tick=1; int time=5; int time2= 0; int div=1; int valor1 =0; int valor2 = 0; if(PadraoInit==0){ int i; for(i=0; i < size; i+=1){ values[i]=0; } int k; for(k=1; k <= div ; k++){ valor1=(k-1)*resolution/div; valor2=(k)*resolution/div; int n; for(n=0; n < size;n++){ int i; for(i=valor1; i <= valor2; i+=tick){ changeValue(n,'b',i); } SendData(values,size); if(time !=0) Wait(time); if(time2 !=0) Wait(time2); } } SendData(values,size); PadraoInit=1; } int k; //==========Sobe vermelho================== for(k=1; k <= div; k++){ valor1=(k-1)*(resolution)/div; valor2=(k)*(resolution)/div; int n; for(n=0; n < size && MudaPadrao==0;n++){ int i; for(i=valor1; i <= valor2; i+=tick){ changeValue(n,'r',i); } SendData(values,size); Wait(time); } } //====Desce azul================= for(k=div; k >= 1; k--){ valor1=(k-1)*resolution/div; valor2=(k)*resolution/div; int n; for(n=0; n < size;n++){ int i; for(i=valor2; i >= valor1 && MudaPadrao==0; i-=tick){ changeValue(n,'b',i); } SendData(values,size); if(time !=0) Wait(time); if(time2 !=0) Wait(time2); } } //==============Sobe verde======================= for(k=1; k <= div; k++){ valor1=(k-1)*resolution/div; valor2=(k)*resolution/div; int n; for(n=0; n < size;n++){ int i; for(i=valor1; i <= valor2 && MudaPadrao==0; i+=tick){ changeValue(n,'g',i); } SendData(values,size); if(time !=0) Wait(time); if(time2 !=0) Wait(time2); } } //=====Desce vermelho========= for(k=div; k >= 1; k--){ valor1=(k-1)*resolution/div; valor2=(k)*resolution/div; int n; for(n=0; n < size;n++){ int i; for(i=valor2; i >= valor1 && MudaPadrao==0; i-=tick){ changeValue(n,'r',i); } SendData(values,size); if(time !=0) Wait(time); if(time2 !=0) Wait(time2); } } //==========Sobe azul=============== for(k=1; k <= div; k++){ valor1=(k-1)*resolution/div; valor2=(k)*resolution/div; int n; for(n=0; n < size;n++){ int i; for(i=valor1; i <= valor2 && MudaPadrao==0; i+=tick){ changeValue(n,'b',i); } SendData(values,size); if(time !=0) Wait(time); if(time2 !=0) Wait(time2); } } //======desce verde======== for(k=div; k >= 1; k--){ valor1=(k-1)*resolution/div; valor2=(k)*resolution/div; int n; for(n=0; n < size;n++){ int i; for(i=valor2; i >= valor1 && MudaPadrao==0; i-=tick){ changeValue(n,'g',i); } SendData(values,size); if(time !=0) Wait(time); if(time2 !=0) Wait(time2); } }}void Pattern2(){ int resolution=Maxbrilho; int tick=1; int time=3; int time2= 0; int div=3; int valor1 =0; int valor2 = 0; if(PadraoInit==0){ TurnOFFAll(); int k; for(k=1; k <= div ; k++){ valor1=(k-1)*resolution/div; valor2=(k)*resolution/div; int n; for(n=0; n < size;n++){ int i; for(i=valor1; i <= valor2; i+=tick){ changeValue(n,'b',i); } SendData(values,size); if(time !=0) Wait(time); if(time2 !=0) Wait(time2); } } SendData(values,size); PadraoInit=1; } int k; //==========Sobe vermelho================== for(k=1; k <= div; k++){ valor1=(k-1)*(resolution)/div; valor2=(k)*(resolution)/div; int n; for(n=0; n < size;n++){ int i; for(i=valor1; i <= valor2 && MudaPadrao==0; i+=tick){ changeValue(n,'r',i); } SendData(values,size); if(time !=0) Wait(time); if(time2 !=0) Wait(time2); } } //====Desce azul================= for(k=div; k >= 1; k--){ valor1=(k-1)*resolution/div; valor2=(k)*resolution/div; int n; for(n=0; n < size;n++){ int i; for(i=valor2; i >= valor1 && MudaPadrao==0; i-=tick){ changeValue(n,'b',i); } SendData(values,size); if(time !=0) Wait(time); if(time2 !=0) Wait(time2); } } //==============Sobe verde======================= for(k=1; k <= div; k++){ valor1=(k-1)*resolution/div; valor2=(k)*resolution/div; int n; for(n=0; n < size;n++){ int i; for(i=valor1; i <= valor2 && MudaPadrao==0; i+=tick){ changeValue(n,'g',i); } SendData(values,size); if(time !=0) Wait(time); if(time2 !=0) Wait(time2); } } //=====Desce vermelho========= for(k=div; k >= 1; k--){ valor1=(k-1)*resolution/div; valor2=(k)*resolution/div; int n; for(n=0; n < size;n++){ int i; for(i=valor2; i >= valor1 && MudaPadrao==0; i-=tick){ changeValue(n,'r',i); } SendData(values,size); if(time !=0) Wait(time); if(time2 !=0) Wait(time2); } } //==========Sobe azul=============== for(k=1; k <= div; k++){ valor1=(k-1)*resolution/div; valor2=(k)*resolution/div; int n; for(n=0; n < size;n++){ int i; for(i=valor1; i <= valor2 && MudaPadrao==0; i+=tick){ changeValue(n,'b',i); } SendData(values,size); if(time !=0) Wait(time); if(time2 !=0) Wait(time2); } } //======desce verde======== for(k=div; k >= 1; k--){ valor1=(k-1)*resolution/div; valor2=(k)*resolution/div; int n; for(n=0; n < size;n++){ int i; for(i=valor2; i >= valor1 && MudaPadrao==0; i-=tick){ changeValue(n,'g',i); } SendData(values,size); if(time !=0) Wait(time); if(time2 !=0) Wait(time2); } }}/* * This Pattern was not used */void Pattern1(){ uint32_t green =0, red=0, blue=0; int i; for( i=1; i <= size; i++){ if(i%8==0){ red = 255; green =255; blue=0; } else if(i%7==0){ red = 0; green =255; blue=0; } else if(i%6==0){ red = 0; green =255; blue=255; } else if(i%5==0){ red = 0; green =0; blue=255; } else if(i%4==0){ red = 255; green =0; blue=255; } else if(i%3==0){ red = 255; green =255; blue=255; } else if(i%2==0){ red = 255; green =0; blue=0; } values[i-1] = green; values[i-1] = (values[i-1] << 8) + red; values[i-1] = (values[i-1] << 8) + blue; } SendData(values,size); Wait(10); //while(1); int temp; int anterior; while(1){ int i; for( i =0; i < size; i++){ if(i==0) anterior = values[size-1]; temp = values[i]; values[i] = anterior; anterior = temp; } SendData(values,size); Wait(50); }} int main(){ SysCtlClockSet(SYSCTL_SYSDIV_2_5|SYSCTL_USE_PLL|SYSCTL_OSC_MAIN|SYSCTL_XTAL_16MHZ); SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF); SysCtlDelay(3); GPIOPinTypeGPIOInput(GPIO_PORTF_BASE, GPIO_PIN_1); GPIOPadConfigSet(GPIO_PORTF_BASE,GPIO_PIN_1,GPIO_STRENGTH_2MA,GPIO_PIN_TYPE_STD_WPU); GPIOIntTypeSet(GPIO_PORTF_BASE,GPIO_PIN_1,GPIO_BOTH_EDGES); GPIOIntRegister(GPIO_PORTF_BASE,PortFIntHandler); GPIOIntEnable(GPIO_PORTF_BASE, GPIO_INT_PIN_1); int i; for( i=0; i < size; i++) values[i] = 0; SysTickbegin(); SPIInit(); SendData(values,size); Wait(1000); while(1){ int i; Policia(); PadraoInit=0; MudaPadrao = 0; for(i=0; i < 3 && MudaPadrao==0; i++) Pattern3(); PadraoInit=0; MudaPadrao = 0; Ambulancia(); PadraoInit=0; MudaPadrao = 0; for(i=0; i < 3 && MudaPadrao==0; i++) Pattern2(); PadraoInit=0; MudaPadrao = 0; Pattern4(); PadraoInit=0; MudaPadrao = 0; }}