test_pwm.c File Reference

Tests for the PWM driver. More...

#include "unity.h"
#include "MockHL_etpwm.h"
#include "pwm.h"
#include "test_assert_helper.h"

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Functions
long	FSYS_RaisePrivilege (void)
	raise privilege More...
void	PWM_SetDutyCycle_Test (uint16_t timeBasePeriod, uint16_t dutyCycleIn, uint16_t dutyCycleOut)
uint16_t	calculateCounterValue (uint16_t timeBasePeriod, uint16_t dutyCycle)
void	setUp (void)
void	tearDown (void)
void	testPWM_StartPwm (void)
void	testPWM_StopPwm (void)
void	testPWM_SetDutyCycle (void)

Variables
static uint8_t	fsysRaisePrivilegeReturnValue = 0u

Detailed Description

Tests for the PWM driver.

Copyright

© 2010 - 2021, Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V. All rights reserved.

SPDX-License-Identifier: BSD-3-Clause

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Author

foxBMS Team

Date

2021-10-08 (date of creation)

Updated

2021-10-08 (date of last update)

Prefix

TEST

Definition in file test_pwm.c.

Function Documentation

calculateCounterValue()

uint16_t calculateCounterValue	(	uint16_t	timeBasePeriod,
		uint16_t	dutyCycle
	)

calculates the PWM counter value

Parameters

[in]	timeBasePeriod	This time base period will be assumed for the calculation
[in]	dutyCycle	The requested duty cycle in permill

Definition at line 93 of file test_pwm.c.

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FSYS_RaisePrivilege()

long FSYS_RaisePrivilege

(

void

)

raise privilege

This alias is mapped to an ASM function and raises to a privileged processor state if the system is currently in user mode. This is done by the following ASM code:

• Copy the contents of a CP14 or CP15 coprocessor register (in this case SPSR – Saved Program Status Register) into local register r12:

  mrs     r12, spsr 

• Perform bitwise AND on the contents of r12 and 0x0F
• write to r0
• update condition code flag on result of operation

  ands    r0, r12, #0x0F      ; return value 

• Perform a logical OR on the contents of r12 and 0x1F, if equal to condition code flag from previous instruction
• write to r12

  orreq   r12, r12, #0x1F 

• Conditionally (equal on previous instruction condition code flag) load immediate result from r12 into control field mask byte, PSR[7:0] (privileged software execution) from SPSR

  msreq   spsr_c, r12 

• Branch and exchange instruction set
• Target address is contained in r14

  bx      r14 

It is important to issue FSYS_SwitchToUserMode() after the privileged mode is no longer needed. Otherwise the system would stay in privileged mode.

The datatype of the return value has to be reevaluated when changing platform and compiler.

Returns

return value is zero if caller was in user mode (type: long)

Definition at line 63 of file test_pwm.c.

PWM_SetDutyCycle_Test()

void PWM_SetDutyCycle_Test	(	uint16_t	timeBasePeriod,
		uint16_t	dutyCycleIn,
		uint16_t	dutyCycleOut
	)

wraps the duty cycle function for test

The output duty cycle is tested against the value computed by the function.

Parameters

[in]	timeBasePeriod	This value will be injected as a time base period
[in]	dutyCycleIn	This value will be passed as requested duty cycle in permill
[in]	dutyCycleOut	The expected output duty cycle (in counts)

Definition at line 75 of file test_pwm.c.

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setUp()

void setUp

(

void

)

Definition at line 116 of file test_pwm.c.

tearDown()

void tearDown

(

void

)

Definition at line 120 of file test_pwm.c.

testPWM_SetDutyCycle()

void testPWM_SetDutyCycle

(

void

)

tests the duty cycle function

Definition at line 150 of file test_pwm.c.

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testPWM_StartPwm()

void testPWM_StartPwm

(

void

)

test that the start function calls etPWM API

Definition at line 126 of file test_pwm.c.

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testPWM_StopPwm()

void testPWM_StopPwm

(

void

)

test that the stop function calls etPWM API

Definition at line 138 of file test_pwm.c.

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Variable Documentation

fsysRaisePrivilegeReturnValue

uint8_t fsysRaisePrivilegeReturnValue = 0u

static

Definition at line 62 of file test_pwm.c.