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/**
* @file
*
* @ingroup arm_beagle
*
* @brief BeagleBone Black BSP definitions.
*/
/**
* Copyright (c) 2016 Punit Vara <punitvara at gmail.com>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
/** Some constants are taken from
* https://github.com/VegetableAvenger/BBBIOlib/blob/master/BBBio_lib/BBBiolib_PWMSS.h
*/
#ifndef LIBBSP_ARM_BEAGLE_BBB_PWM_H
#define LIBBSP_ARM_BEAGLE_BBB_PWM_H
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/**
* @brief BeagleBone Black PWM Macros.
*/
#define BBB_CONTROL_CONF_GPMC_AD(n) (0x800 + (n * 4))
#define BBB_CONTROL_CONF_LCD_DATA(n) (0x8a0 + (n * 4))
#define BBB_PWMSS_COUNT 3
#define BBB_PWMSS0 0
#define BBB_PWMSS1 1
#define BBB_PWMSS2 2
#define BBB_P8_13_2B 3
#define BBB_P8_19_2A 4
#define BBB_P8_45_2A 5
#define BBB_P8_46_2B 6
#define BBB_P8_34_1B 7
#define BBB_P8_36_1A 8
#define BBB_P9_14_1A 9
#define BBB_P9_16_1B 10
#define BBB_P9_21_0B 11
#define BBB_P9_22_0A 12
#define BBB_P9_29_0B 13
#define BBB_P9_31_0A 14
#define BBB_MUX0 0
#define BBB_MUX1 1
#define BBB_MUX2 2
#define BBB_MUX3 3
#define BBB_MUX4 4
#define BBB_MUX5 5
#define BBB_MUX6 6
#define BBB_MUX7 7
#define BBB_EPWM1 1
#define BBB_EPWM2 2
#define BBB_EPWM0 0
/**
* @brief BeagleBone Black PWM API.
*/
/**
* @brief This function intilize clock and pinmuxing for pwm sub system.
*
* @param PWMSS_ID It is the instance number of EPWM of pwm sub system.
*
* @return true if successful
* @return false if not successful
*
**/
bool beagle_pwm_init(uint32_t pwmss_id);
/* PWMSS setting
* set pulse argument of epwm module
*
* @param pwm_id : EPWMSS number , 0~2
* @param pwm_freq : frequency to be generated
* @param dutyA : Duty Cycle in ePWM A
* @param dutyB : Duty Cycle in ePWM B
*
* @return : 1 for success
* @return : 0 for failed
*
* @example : PWMSS_Setting(0 , 50.0f , 50.0f , 25.0f); // Generate 50HZ pwm in PWM0 ,
* // duty cycle is 50% for ePWM0A , 25% for ePWM0B
*
* @Note :
* find an number nearst 65535 for TBPRD , to improve duty precision,
*
* Using big TBPRD can increase the range of CMPA and CMPB ,
* and it means we can get better precision on duty cycle.
*
* EX : 20.25% duty cycle
* on TBPRD = 62500 , CMPA = 12656.25 ( .25 rejection) , real duty : 20.2496% (12656 /62500)
* on TBPRD = 6250 , CMPA = 1265.625 ( .625 rejection), real duty : 20.24% (1265 6250)
* on TBPRD = 500 , CMPA = 101.25 ( .25 rejection) , real duty : 20.2% (101/500)
*
* Divisor = CLKDIV * HSPCLKDIV
* 1 TBPRD : 10 ns (default)
* 65535 TBPRD : 655350 ns
* 65535 TBPRD : 655350 * Divisor ns = X TBPRD : Cyclens
*
* accrooding to that , we must find a Divisor value , let X nearest 65535 .
* so , Divisor must Nearest Cyclens/655350
*/
int beagle_pwmss_setting(uint32_t pwm_id, float pwm_freq, float dutyA, float dutyB);
/**
* @brief This API enables the particular PWM module.
*
* @param pwmid It is the instance number of EPWM of pwm sub system.
*
* @return true if successful
* @return false if fail
*
**/
bool beagle_ehrpwm_enable(uint32_t pwmid);
/**
* @brief This API disables the HR sub-module.
*
* @param pwmid It is the instance number of EPWM of pwm sub system.
*
* @return true if successful
* @return false if fail
*
**/
bool beagle_ehrpwm_disable(uint32_t pwmid);
/**
* @brief This function Enables pinmuxing for PWM module.
*
* @param pin_no It is individual pin at which freuqency need to be generated.
* It should be according to pwm sub system.
*
* @param pwm_id It is the instance number of EPWM of pwmsubsystem.
*
* @return true if successful
* @return false if fail
*
**/
bool beagle_epwm_pinmux_setup(uint32_t pin_no, uint32_t pwm_id);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* LIBBSP_ARM_BEAGLE_BBB_PWM_H */
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