ez_dsp

A Lib for Dsp28335

Use simple api to operate dsp

Api Document:https://taoduhui.github.io/ez_dsp/document/ez-dsp

EN|中文

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progress

1. • ez_pwm
   1. • pwm basic handler
   2. • spwm basic handler
   3. • svpwm basic handler
   4. • foc basic handler
   5. • Automatic Pre-Scale to support f>1KHz
   6. • ePwm Channel B Free Control
   7. • spwm or svpwm sin phase offset
2. • ez-tim
   1. • basic handler
   2. • Global Timer Share
   3. • Automatic Pre-Scale
3. • ez-gpio
   1. • gpio basic handler
4. • ez-adc
5. • ez-sci
6. • ez-spi
7. • ez-i2c
8. • ez-qep
9. • ez-cap

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import

ez_pwm

intro

ez_pwm is a part of ez_dsp lib, you can use it to init and generate pwm,spwm and svpwm.

usage

For using this lib,

You need to modify the PwmGen_Config Area definitions in the ez_pwm.c to adapter your project

#define SystemFrequency 40000000 
#define SpwmRefresh_us 100  //every 100us,spwm will update the ePwm's compare larger then 100 and  less then  400
#define SpwmUseTimSeq 0     //number of Timer you want to use for spwm generate
#define SinAccuracy 1024    //Sin Table Length
volatile struct PwmGen_GlobalSpwmExtensionParameter PwmGen_GlobalSpwmParameter={0,0,{0,0,0,0,0,0}};

Use the ePwm

first, Call PwmGen_Setup_Use_Pwm( [The_ePwm_Number] ) above all in global area,if you want to Active the ePwm Module

just like following:

PwmGen_Setup_Use_Pwm(1);
PwmGen_Setup_Use_Pwm(2);

in the above code, we want to use the ePwm1 and ePwm2 to generate pwm

Define the interrupts

following a series of PwmGen_Setup_Use_Pwm

you need to define the interrupt function "PwmGen_Event_Pwm( [The_ePwm_Number] )"

and this function will be called, when the Counter==0 (default)

or you can call PwmGen_Setup_Use_Interrup_on_XXXX to change the interrupt action

the body is the interrupt function body

PwmGen_Event_Pwm(2){

}

PwmGen_Event_SPwm(1)
{
    volatile int a = 0;
}

Run as Spwm Mode

After the Interrupt functions, if you want to let some ePwm work at Spwm mode

you should call the macro function PwmGen_Setup_EnableSpwmUpdateTask( [The_Timer_Bumber] )

and in its function body, write down PwmGen_Setup_Use_as_Spwm( [The ePwm Number you want to set as Spwm] );

Once you set a ePwm Module work at Spwm Mode, a Timer Resource will be occupied

but it's only one Timer wiil be occupied, whatever how much ePwm work at Spwm mode

Example:

PwmGen_Setup_EnableSpwmUpdateTask(0){
    PwmGen_Setup_Use_as_Spwm(1);
}

Set the Parameters

After all the definitions, the struct ePwm_Config is avaiable they will be named by Pwm[The_ePwm_Number]_Config ( let X is [The_ePwm_Number] in the following )

if you has called the corresponding PwmGen_Setup_Use_Pwm macro function in the definition area

You can just input PwmX_Config. and press Alt+/ to get hint which is about what the PwmGen can do or you can download the Stm32CubeAuto to Automatic Press the Alt+/ https://github.com/Taoduhui/Stm32CubeAuto

Finally you should call the macro function PwmGen_Setup_By_Config([The_ePwm_Number]) or PwmGen_Setup_By_Config_As_SpwmGen([The_ePwm_Number],SpwmUseTimSeq,SpwmRefresh_us) to Setup the ePwm

the parameter SpwmUseTimSeq and SpwmRefresh_us should not passing directly

if you want to modify the TimerNumber or the SpwmRefreshTime, you should modify the macro definitions at PwmGen Config Area

void PwmGen_Init_Example()
{
   Pwm1_Config.Period_s = 0.0001;
   Pwm1_Config.DutyCycle=0.5;
   Pwm1_Config.Pair_Type = Pwm_Pair_Type_Opposite;
   Pwm1_Config.RiseDeadBand_s = 0.000002;
   Pwm1_Config.FallDeadBand_s =  0.000002;
   Pwm1_Config.IsSpwm = 1;
   Pwm1_Config.SpwmConfig.Amplify = 1;
   Pwm1_Config.SpwmConfig.TimeRatio = 1;
   Pwm1_Config.SpwmConfig.Period_us = 10000;
   PwmGen_Setup_By_Config_As_SpwmGen(1,SpwmUseTimSeq,SpwmRefresh_us);

   Pwm2_Config.Period_s = 0.0001;
   Pwm2_Config.DutyCycle=0.5;
   Pwm2_Config.Pair_Type = Pwm_Pair_Type_Opposite;
   Pwm2_Config.RiseDeadBand_s = 0.000002;
   Pwm2_Config.FallDeadBand_s =  0.000002;
   PwmGen_Setup_By_Config(2)
}

You can open ez_pwm.c to get complete example

ez_tim