Jeroen Lodder / Mbed 2 deprecated SteppermotorBoard

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CT32B0_PWM.cpp File Reference

CT32B0_PWM.cpp File Reference

Small driver to user CT32B0 for PWM. More...

Go to the source code of this file.

static volatile uint8_t stage = 0
 Stage identifier for mat2/3 swap.
static volatile uint32_t period = 0
 PWM Period register.
static volatile uint32_t mat [4]
 PWM Mat output registers.
static volatile uint32_t default_period_us
 Given period in us.
static volatile uint32_t defaultstate
 Default PWM state on init.
void CT32B0_initpwm (uint32_t period_us, uint32_t defaultstate)
 Initializes PWM.
void CT32B0_reinitpwm (void)
 Re-Initializes PWM.
void CT32B0_start (void)
 Start PWM.
void CT32B0_deinit (uint8_t state)
 Stop PWM.
void CT32B0_stage (uint8_t stagearg)
 Set stage.
void CT32B0_reload_mat (void)
 Reload all match compare registers.
void CT32B0_set (uint8_t matnr, uint32_t value)
 Set channel PWM.
void CT32B0_wait_refresh (void)
 Wait for timer to reach 0.

Detailed Description

Small driver to user CT32B0 for PWM.

Author:
Jeroen Lodder
Date:
Oktober 2013
Note:
Since only one timer is used to supply 4 PWM channels a problem occurs because CT32B0 only support 3 PWM channels.

Since this software is designed for a H-Bridge implementation only 2 of 4 PWM channels are required to be active simultaneously.

This is where the stage variable comes in: Stage 0: PWM enabled on MAT 0, MAT 1 and MAT 2. Stage 1: PWM enabled on MAT 0, MAT 1 and MAT 3. Unused MAT outputs will be pullled down.

Definition in file CT32B0_PWM.cpp.

Function Documentation

void CT32B0_deinit ( uint8_t  state )

Stop PWM.

Parameters:
[in]statePWM output state when pwm disabled

Definition at line 111 of file CT32B0_PWM.cpp.

void CT32B0_initpwm ( uint32_t  period_us,
uint32_t  defaultstate 
)

Initializes PWM.

Parameters:
[in]period_usPeriod in us, when prescaler is 48
[in]defaultstateState after initializing
Note:
Run Start() to start pwm

Definition at line 40 of file CT32B0_PWM.cpp.

void CT32B0_reinitpwm ( void   )

Re-Initializes PWM.

Definition at line 96 of file CT32B0_PWM.cpp.

void CT32B0_reload_mat ( void   )

Reload all match compare registers.

Definition at line 158 of file CT32B0_PWM.cpp.

void CT32B0_set ( uint8_t  matnr,
uint32_t  value 
)

Set channel PWM.

Definition at line 171 of file CT32B0_PWM.cpp.

void CT32B0_stage ( uint8_t  stagearg )

Set stage.

Parameters:
[in]stagearg1 or 0

Definition at line 129 of file CT32B0_PWM.cpp.

void CT32B0_start ( void   )

Start PWM.

Definition at line 103 of file CT32B0_PWM.cpp.

void CT32B0_wait_refresh ( void   )

Wait for timer to reach 0.

Definition at line 179 of file CT32B0_PWM.cpp.

Variable Documentation

volatile uint32_t default_period_us [static]

Given period in us.

Definition at line 30 of file CT32B0_PWM.cpp.

volatile uint32_t defaultstate [static]

Default PWM state on init.

Definition at line 31 of file CT32B0_PWM.cpp.

volatile uint32_t mat[4] [static]

PWM Mat output registers.

Definition at line 29 of file CT32B0_PWM.cpp.

volatile uint32_t period = 0 [static]

PWM Period register.

Definition at line 28 of file CT32B0_PWM.cpp.

volatile uint8_t stage = 0 [static]

Stage identifier for mat2/3 swap.

Definition at line 27 of file CT32B0_PWM.cpp.

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