diff options
Diffstat (limited to 'c/src/lib/libbsp/arm/beagle/include/bbb-pwm.h')
| -rw-r--r-- | c/src/lib/libbsp/arm/beagle/include/bbb-pwm.h | 162 |
1 files changed, 138 insertions, 24 deletions
diff --git a/c/src/lib/libbsp/arm/beagle/include/bbb-pwm.h b/c/src/lib/libbsp/arm/beagle/include/bbb-pwm.h index 761eae2b37..ef016f036b 100644 --- a/c/src/lib/libbsp/arm/beagle/include/bbb-pwm.h +++ b/c/src/lib/libbsp/arm/beagle/include/bbb-pwm.h @@ -1,3 +1,23 @@ +/** + * @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 @@ -8,31 +28,125 @@ extern "C" { /** * @brief BeagleBone Black PWM Macros. */ -#define BBBIO_PWMSS_COUNT 3 -#define BBBIO_PWMSS0 0 -#define BBBIO_PWMSS1 1 -#define BBBIO_PWMSS2 2 - -#define MUXMODE0 0 -#define MUXMODE1 1 -#define MUXMODE2 2 -#define MUXMODE3 3 -#define MUXMODE4 4 -#define MUXMODE5 5 -#define MUXMODE6 6 -#define MUXMODE7 7 - -#define EPWM_GROUP1 1 -#define EPWM_GROUP2 2 -#define EPWM_GROUP0 0 - -int BBBIO_PWMSS_Setting(unsigned int PWMID , float HZ ,float dutyA ,float dutyB); -int BBBIO_PWM_Init(); -void BBBIO_PWM_Release(); -int BBBIO_PWMSS_Status(unsigned int PWMID); -void BBBIO_ehrPWM_Enable(unsigned int PWMSS_ID); -void BBBIO_ehrPWM_Disable(unsigned int PWMSS_ID); +#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 } |