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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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54
targets/TARGET_Freescale/TARGET_KLXX/pwmout_api.c
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@ -23,7 +23,8 @@
static float pwm_clock;
void pwmout_init(pwmout_t* obj, PinName pin) {
void pwmout_init(pwmout_t *obj, PinName pin)
{
// determine the channel
PWMName pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
MBED_ASSERT(pwm != (PWMName)NC);
@ -51,10 +52,11 @@ void pwmout_init(pwmout_t* obj, PinName pin) {
while (clkval > 1) {
clkdiv++;
clkval /= 2.0;
if (clkdiv == 7)
if (clkdiv == 7) {
break;
}
}
pwm_clock = clkval;
unsigned int port = (unsigned int)pin >> PORT_SHIFT;
unsigned int tpm_n = (pwm >> TPM_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
pwmout_period_ms(obj, 20);
pwmout_write (obj, 0);
pwmout_write(obj, 0);
// Wire pinout
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) {
value = 0.0;
} else if (value > 1.0) {
@ -92,38 +95,63 @@ void pwmout_write(pwmout_t* obj, float value) {
*obj->CNT = 0;
}
float pwmout_read(pwmout_t* obj) {
float pwmout_read(pwmout_t *obj)
{
float v = (float)(*obj->CnV) / (float)(*obj->MOD + 1);
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);
}
void pwmout_period_ms(pwmout_t* obj, int ms) {
void pwmout_period_ms(pwmout_t *obj, int ms)
{
pwmout_period_us(obj, ms * 1000);
}
// 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);
*obj->MOD = (uint32_t)(pwm_clock * (float)us) - 1;
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);
}
void pwmout_pulsewidth_ms(pwmout_t* obj, int ms) {
void pwmout_pulsewidth_ms(pwmout_t *obj, int ms)
{
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);
}
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()
{
return PinMap_PWM;