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imx233: enhance pwm

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The current pwm interface is too low-level. Introduce a higher
level setup function which directly computes the parameters from
the required frequency.

Change-Id: Ie95c7522e9f42492fe872203f4cab46770a9649a
This commit is contained in:
Amaury Pouly 2013-06-16 20:15:32 +02:00
parent f5ac658d16
commit f8d2984875
4 changed files with 99 additions and 20 deletions
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25
firmware/target/arm/imx233/pwm-imx233.h
View file

@ -33,13 +33,26 @@
#define IMX233_PWM_NR_CHANNELS 5
#define IMX233_PWM_PIN_BANK(channel) 1
#define IMX233_PWM_PIN(channel) (26 + (channel))
void imx233_pwm_init(void);
void imx233_pwm_setup_channel(int channel, int period, int cdiv, int active,
void imx233_pwm_setup(int channel, int period, int cdiv, int active,
int active_state, int inactive, int inactive_state);
void imx233_pwm_enable_channel(int channel, bool enable);
bool imx233_pwm_is_channel_enable(int channel);
/* helper function to compute adequate divisor and period, given a minimum
* period resolution (for active/inactive) */
void imx233_pwm_lookup_freq(int freq, int min_period, int *period, int *cdiv);
/* simple setup with active 1, inactive 0, duty cycle in percent */
void imx233_pwm_setup_simple(int channel, int freq, int duty_cycle);
void imx233_pwm_enable(int channel, bool enable);
bool imx233_pwm_is_enabled(int channel);
struct imx233_pwm_info_t
{
bool enabled;
int cdiv;
int period;
int inactive, active;
char inactive_state, active_state; // '0', '1' or 'Z'
};
struct imx233_pwm_info_t imx233_pwm_get_info(int channel);
#endif /* __PWM_IMX233_H__ */