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pwmout - KLXX - add read methods for period and pulsewidth

pull/13492/head
talorion 2020-08-25 23:39:25 +02:00 committed by Gregor Mayramhof
parent 091e40ee04
commit 5763b3a136
1 changed files with 41 additions and 13 deletions
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52
targets/TARGET_Freescale/TARGET_KLXX/pwmout_api.c
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@ -23,7 +23,8 @@
static float pwm_clock; static float pwm_clock;
void pwmout_init(pwmout_t* obj, PinName pin) { void pwmout_init(pwmout_t *obj, PinName pin)
{
// determine the channel // determine the channel
PWMName pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM); PWMName pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
MBED_ASSERT(pwm != (PWMName)NC); MBED_ASSERT(pwm != (PWMName)NC);
@ -51,9 +52,10 @@ void pwmout_init(pwmout_t* obj, PinName pin) {
while (clkval > 1) { while (clkval > 1) {
clkdiv++; clkdiv++;
clkval /= 2.0; clkval /= 2.0;
if (clkdiv == 7) if (clkdiv == 7) {
break; break;
} }
}
pwm_clock = clkval; pwm_clock = clkval;
unsigned int port = (unsigned int)pin >> PORT_SHIFT; unsigned int port = (unsigned int)pin >> PORT_SHIFT;
@ -73,15 +75,16 @@ void pwmout_init(pwmout_t* obj, PinName pin) {
// default to 20ms: standard for servos, and fine for e.g. brightness control // default to 20ms: standard for servos, and fine for e.g. brightness control
pwmout_period_ms(obj, 20); pwmout_period_ms(obj, 20);
pwmout_write (obj, 0); pwmout_write(obj, 0);
// Wire pinout // Wire pinout
pinmap_pinout(pin, PinMap_PWM); pinmap_pinout(pin, PinMap_PWM);
} }
void pwmout_free(pwmout_t* obj) {} void pwmout_free(pwmout_t *obj) {}
void pwmout_write(pwmout_t* obj, float value) { void pwmout_write(pwmout_t *obj, float value)
{
if (value < 0.0) { if (value < 0.0) {
value = 0.0; value = 0.0;
} else if (value > 1.0) { } else if (value > 1.0) {
@ -92,38 +95,63 @@ void pwmout_write(pwmout_t* obj, float value) {
*obj->CNT = 0; *obj->CNT = 0;
} }
float pwmout_read(pwmout_t* obj) { float pwmout_read(pwmout_t *obj)
{
float v = (float)(*obj->CnV) / (float)(*obj->MOD + 1); float v = (float)(*obj->CnV) / (float)(*obj->MOD + 1);
return (v > 1.0) ? (1.0) : (v); return (v > 1.0) ? (1.0) : (v);
} }
void pwmout_period(pwmout_t* obj, float seconds) { void pwmout_period(pwmout_t *obj, float seconds)
{
pwmout_period_us(obj, seconds * 1000000.0f); pwmout_period_us(obj, seconds * 1000000.0f);
} }
void pwmout_period_ms(pwmout_t* obj, int ms) { void pwmout_period_ms(pwmout_t *obj, int ms)
{
pwmout_period_us(obj, ms * 1000); pwmout_period_us(obj, ms * 1000);
} }
// Set the PWM period, keeping the duty cycle the same. // Set the PWM period, keeping the duty cycle the same.
void pwmout_period_us(pwmout_t* obj, int us) { void pwmout_period_us(pwmout_t *obj, int us)
{
float dc = pwmout_read(obj); float dc = pwmout_read(obj);
*obj->MOD = (uint32_t)(pwm_clock * (float)us) - 1; *obj->MOD = (uint32_t)(pwm_clock * (float)us) - 1;
pwmout_write(obj, dc); pwmout_write(obj, dc);
} }
void pwmout_pulsewidth(pwmout_t* obj, float seconds) { int pwmout_read_period_us(pwmout_t *obj)
{
uint32_t tmp = 0;
if (pwm_clock > 0) {
tmp = ((*obj->MOD) + 1) / pwm_clock;
}
return tmp;
}
void pwmout_pulsewidth(pwmout_t *obj, float seconds)
{
pwmout_pulsewidth_us(obj, seconds * 1000000.0f); pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
} }
void pwmout_pulsewidth_ms(pwmout_t* obj, int ms) { void pwmout_pulsewidth_ms(pwmout_t *obj, int ms)
{
pwmout_pulsewidth_us(obj, ms * 1000); pwmout_pulsewidth_us(obj, ms * 1000);
} }
void pwmout_pulsewidth_us(pwmout_t* obj, int us) { void pwmout_pulsewidth_us(pwmout_t *obj, int us)
{
*obj->CnV = (uint32_t)(pwm_clock * (float)us); *obj->CnV = (uint32_t)(pwm_clock * (float)us);
} }
int pwmout_read_pulsewidth_us(pwmout_t *obj)
{
uint32_t tmp = 0;
if (pwm_clock > 0) {
tmp = (*obj->CnV) / pwm_clock;
}
return tmp;
}
const PinMap *pwmout_pinmap() const PinMap *pwmout_pinmap()
{ {
return PinMap_PWM; return PinMap_PWM;