Hallo Interessierte,
ich verstehe nicht, wie das PWM hier Vorwaerts und Rueckwaerts steuert?
https://github.com/espressif/esp-idf/blob/master/examples/peripherals/mcpwm/mcpwm_brushed_dc_control/main/mcpwm_brushed_dc_control_example.c
1 | /**
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2 | * @brief motor moves in forward direction, with duty cycle = duty %
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3 | */
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4 | static void brushed_motor_forward(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num , float duty_cycle)
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5 | {
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6 | mcpwm_set_signal_low(mcpwm_num, timer_num, MCPWM_OPR_B);
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7 | mcpwm_set_duty(mcpwm_num, timer_num, MCPWM_OPR_A, duty_cycle);
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8 | mcpwm_set_duty_type(mcpwm_num, timer_num, MCPWM_OPR_A, MCPWM_DUTY_MODE_0); //call this each time, if operator was previously in low/high state
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9 | }
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10 |
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11 | /**
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12 | * @brief motor moves in backward direction, with duty cycle = duty %
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13 | */
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14 | static void brushed_motor_backward(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num , float duty_cycle)
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15 | {
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16 | mcpwm_set_signal_low(mcpwm_num, timer_num, MCPWM_OPR_A);
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17 | mcpwm_set_duty(mcpwm_num, timer_num, MCPWM_OPR_B, duty_cycle);
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18 | mcpwm_set_duty_type(mcpwm_num, timer_num, MCPWM_OPR_B, MCPWM_DUTY_MODE_0); //call this each time, if operator was previously in low/high state
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19 | }
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Ich habe eine passende H-Bruecke, dass funtioniert 1A, allerdings muss
ich zwei PINs high/low setzen. Kein Drama und funktioniert super. Aber
was ist die Idee hinter dem Beispielcode?
