1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup arm_beagle |
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5 | * |
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6 | * @brief BeagleBone Black BSP definitions. |
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7 | */ |
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8 | |
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9 | /** |
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10 | * Copyright (c) 2016 Punit Vara <punitvara at gmail.com> |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | /** Some constants are taken from |
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18 | * https://github.com/VegetableAvenger/BBBIOlib/blob/master/BBBio_lib/BBBiolib_PWMSS.h |
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19 | */ |
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20 | |
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21 | #ifndef LIBBSP_ARM_BEAGLE_BBB_PWM_H |
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22 | #define LIBBSP_ARM_BEAGLE_BBB_PWM_H |
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23 | |
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24 | #ifdef __cplusplus |
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25 | extern "C" { |
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26 | #endif /* __cplusplus */ |
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27 | |
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28 | /** |
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29 | * @brief BeagleBone Black PWM Macros. |
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30 | */ |
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31 | #define BBB_CONTROL_CONF_GPMC_AD(n) (0x800 + (n * 4)) |
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32 | #define BBB_CONTROL_CONF_LCD_DATA(n) (0x8a0 + (n * 4)) |
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33 | |
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34 | #define BBB_PWMSS_COUNT 3 |
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35 | #define BBB_PWMSS0 0 |
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36 | #define BBB_PWMSS1 1 |
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37 | #define BBB_PWMSS2 2 |
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38 | |
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39 | #define BBB_P8_13_2B 3 |
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40 | #define BBB_P8_19_2A 4 |
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41 | #define BBB_P8_45_2A 5 |
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42 | #define BBB_P8_46_2B 6 |
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43 | #define BBB_P8_34_1B 7 |
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44 | #define BBB_P8_36_1A 8 |
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45 | #define BBB_P9_14_1A 9 |
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46 | #define BBB_P9_16_1B 10 |
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47 | #define BBB_P9_21_0B 11 |
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48 | #define BBB_P9_22_0A 12 |
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49 | #define BBB_P9_29_0B 13 |
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50 | #define BBB_P9_31_0A 14 |
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51 | |
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52 | #define BBB_MUX0 0 |
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53 | #define BBB_MUX1 1 |
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54 | #define BBB_MUX2 2 |
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55 | #define BBB_MUX3 3 |
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56 | #define BBB_MUX4 4 |
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57 | #define BBB_MUX5 5 |
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58 | #define BBB_MUX6 6 |
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59 | #define BBB_MUX7 7 |
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60 | |
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61 | #define BBB_EPWM1 1 |
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62 | #define BBB_EPWM2 2 |
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63 | #define BBB_EPWM0 0 |
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64 | |
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65 | /** |
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66 | * @brief BeagleBone Black PWM API. |
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67 | */ |
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68 | |
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69 | /** |
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70 | * @brief This function intilize clock and pinmuxing for pwm sub system. |
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71 | * |
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72 | * @param PWMSS_ID It is the instance number of EPWM of pwm sub system. |
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73 | * |
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74 | * @return true if successful |
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75 | * @return false if not successful |
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76 | * |
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77 | **/ |
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78 | bool beagle_pwm_init(uint32_t pwmss_id); |
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79 | |
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80 | /* PWMSS setting |
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81 | * set pulse argument of epwm module |
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82 | * |
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83 | * @param pwm_id : EPWMSS number , 0~2 |
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84 | * @param pwm_freq : frequency to be generated |
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85 | * @param dutyA : Duty Cycle in ePWM A |
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86 | * @param dutyB : Duty Cycle in ePWM B |
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87 | * |
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88 | * @return : 1 for success |
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89 | * @return : 0 for failed |
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90 | * |
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91 | * @example : PWMSS_Setting(0 , 50.0f , 50.0f , 25.0f); // Generate 50HZ pwm in PWM0 , |
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92 | * // duty cycle is 50% for ePWM0A , 25% for ePWM0B |
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93 | * |
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94 | * @Note : |
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95 | * find an number nearst 65535 for TBPRD , to improve duty precision, |
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96 | * |
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97 | * Using big TBPRD can increase the range of CMPA and CMPB , |
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98 | * and it means we can get better precision on duty cycle. |
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99 | * |
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100 | * EX : 20.25% duty cycle |
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101 | * on TBPRD = 62500 , CMPA = 12656.25 ( .25 rejection) , real duty : 20.2496% (12656 /62500) |
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102 | * on TBPRD = 6250 , CMPA = 1265.625 ( .625 rejection), real duty : 20.24% (1265 6250) |
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103 | * on TBPRD = 500 , CMPA = 101.25 ( .25 rejection) , real duty : 20.2% (101/500) |
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104 | * |
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105 | * Divisor = CLKDIV * HSPCLKDIV |
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106 | * 1 TBPRD : 10 ns (default) |
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107 | * 65535 TBPRD : 655350 ns |
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108 | * 65535 TBPRD : 655350 * Divisor ns = X TBPRD : Cyclens |
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109 | * |
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110 | * accrooding to that , we must find a Divisor value , let X nearest 65535 . |
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111 | * so , Divisor must Nearest Cyclens/655350 |
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112 | */ |
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113 | int beagle_pwmss_setting(uint32_t pwm_id, float pwm_freq, float dutyA, float dutyB); |
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114 | |
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115 | /** |
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116 | * @brief This API enables the particular PWM module. |
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117 | * |
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118 | * @param pwmid It is the instance number of EPWM of pwm sub system. |
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119 | * |
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120 | * @return true if successful |
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121 | * @return false if fail |
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122 | * |
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123 | **/ |
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124 | bool beagle_ehrpwm_enable(uint32_t pwmid); |
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125 | |
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126 | /** |
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127 | * @brief This API disables the HR sub-module. |
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128 | * |
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129 | * @param pwmid It is the instance number of EPWM of pwm sub system. |
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130 | * |
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131 | * @return true if successful |
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132 | * @return false if fail |
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133 | * |
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134 | **/ |
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135 | bool beagle_ehrpwm_disable(uint32_t pwmid); |
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136 | |
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137 | /** |
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138 | * @brief This function Enables pinmuxing for PWM module. |
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139 | * |
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140 | * @param pin_no It is individual pin at which freuqency need to be generated. |
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141 | * It should be according to pwm sub system. |
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142 | * |
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143 | * @param pwm_id It is the instance number of EPWM of pwmsubsystem. |
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144 | * |
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145 | * @return true if successful |
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146 | * @return false if fail |
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147 | * |
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148 | **/ |
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149 | bool beagle_epwm_pinmux_setup(uint32_t pin_no, uint32_t pwm_id); |
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150 | |
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151 | #ifdef __cplusplus |
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152 | } |
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153 | #endif /* __cplusplus */ |
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154 | |
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155 | #endif /* LIBBSP_ARM_BEAGLE_BBB_PWM_H */ |
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