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Free hardware resource in pwmout_free()

pull/1416/head
leibin 2015-11-11 13:56:34 +08:00
parent 7218418919
commit 6127c0bd17
1 changed files with 36 additions and 3 deletions
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39
libraries/mbed/targets/hal/TARGET_NORDIC/TARGET_MCU_NRF51822/pwmout_api.c
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@ -116,6 +116,19 @@ void timer_init(uint8_t pwmChoice)
timer->TASKS_START = 0x01;
}
static void timer_free()
{
NRF_TIMER_Type *timer = Timers[0];
for(uint8_t i = 1; i < NO_PWMS; i++){
if(PWM_taken[i]){
break;
}
if((i == NO_PWMS - 1) && (!PWM_taken[i]))
timer->TASKS_STOP = 0x01;
}
}
/** @brief Function for initializing the GPIO Tasks/Events peripheral.
*/
void gpiote_init(PinName pin, uint8_t channel_number)
@ -154,6 +167,14 @@ void gpiote_init(PinName pin, uint8_t channel_number)
__NOP();
}
static void gpiote_free(PinName pin,uint8_t channel_number)
{
NRF_GPIOTE->TASKS_OUT[channel_number] = 0;
NRF_GPIOTE->CONFIG[channel_number] = 0;
NRF_GPIO->PIN_CNF[pin] = (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos);
}
/** @brief Function for initializing the Programmable Peripheral Interconnect peripheral.
*/
static void ppi_init(uint8_t pwm)
@ -173,6 +194,16 @@ static void ppi_init(uint8_t pwm)
(1 << (channel_number + 1));
}
static void ppi_free(uint8_t pwm)
{
//using ppi channels 0-7 (only 0-7 are available)
uint8_t channel_number = 2*pwm;
// Disable PPI channels.
NRF_PPI->CHEN &= (~(1 << channel_number))
& (~(1 << (channel_number+1)));
}
void setModulation(pwmout_t *obj, uint8_t toggle, uint8_t high)
{
if (high) {
@ -239,11 +270,13 @@ void pwmout_init(pwmout_t *obj, PinName pin)
pwmout_write (obj, 0);
}
void pwmout_free(pwmout_t *obj)
{
void pwmout_free(pwmout_t* obj) {
MBED_ASSERT(obj->pwm != (PWMName)NC);
PWM_taken[obj->pwm] = 0;
pwmout_write(obj, 0);
PWM_taken[obj->pwm] = 0;
timer_free();
ppi_free(obj->pwm);
gpiote_free(obj->pin,obj->pwm);
}
void pwmout_write(pwmout_t *obj, float value)