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px4fmu-v4:Configure timer IO pins with pull downs

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When the CCER is cleared the IO pin tends to float. The FMUV4
  HW has no TXS0108 and if cut off while high will decay.

  By adding the pull down the pins will seek the low state faster.
  13.8 us from off to decabe below threshold.
This commit is contained in:
David Sidrane
2017-05-03 08:33:05 +02:00
committed by Lorenz Meier
parent be375e25d3
commit 33f2897f00
1 changed files with 10 additions and 6 deletions
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src/drivers/boards/px4fmu-v4/board_config.h
+10 -6
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@@ -231,12 +231,16 @@
* CH5 : PD13 : TIM4_CH2
* CH6 : PD14 : TIM4_CH3
*/
#define GPIO_TIM1_CH1OUT (GPIO_ALT|GPIO_AF1|GPIO_SPEED_50MHz|GPIO_OUTPUT_CLEAR|GPIO_PUSHPULL|GPIO_PORTE|GPIO_PIN9)
#define GPIO_TIM1_CH2OUT (GPIO_ALT|GPIO_AF1|GPIO_SPEED_50MHz|GPIO_OUTPUT_CLEAR|GPIO_PUSHPULL|GPIO_PORTE|GPIO_PIN11)
#define GPIO_TIM1_CH3OUT (GPIO_ALT|GPIO_AF1|GPIO_SPEED_50MHz|GPIO_OUTPUT_CLEAR|GPIO_PUSHPULL|GPIO_PORTE|GPIO_PIN13)
#define GPIO_TIM1_CH4OUT (GPIO_ALT|GPIO_AF1|GPIO_SPEED_50MHz|GPIO_OUTPUT_CLEAR|GPIO_PUSHPULL|GPIO_PORTE|GPIO_PIN14)
#define GPIO_TIM4_CH2OUT (GPIO_ALT|GPIO_AF2|GPIO_SPEED_50MHz|GPIO_OUTPUT_CLEAR|GPIO_PUSHPULL|GPIO_PORTD|GPIO_PIN13)
#define GPIO_TIM4_CH3OUT (GPIO_ALT|GPIO_AF2|GPIO_SPEED_50MHz|GPIO_OUTPUT_CLEAR|GPIO_PUSHPULL|GPIO_PORTD|GPIO_PIN14)
/* N.B. the added pull down, on the timer being disabled the PD
* will keep the channel low
*/
#define GPIO_TIM1_CH1OUT (GPIO_ALT|GPIO_AF1|GPIO_SPEED_50MHz|GPIO_OUTPUT_CLEAR|GPIO_PUSHPULL|GPIO_PULLDOWN|GPIO_PORTE|GPIO_PIN9)
#define GPIO_TIM1_CH2OUT (GPIO_ALT|GPIO_AF1|GPIO_SPEED_50MHz|GPIO_OUTPUT_CLEAR|GPIO_PUSHPULL|GPIO_PULLDOWN|GPIO_PORTE|GPIO_PIN11)
#define GPIO_TIM1_CH3OUT (GPIO_ALT|GPIO_AF1|GPIO_SPEED_50MHz|GPIO_OUTPUT_CLEAR|GPIO_PUSHPULL|GPIO_PULLDOWN|GPIO_PORTE|GPIO_PIN13)
#define GPIO_TIM1_CH4OUT (GPIO_ALT|GPIO_AF1|GPIO_SPEED_50MHz|GPIO_OUTPUT_CLEAR|GPIO_PUSHPULL|GPIO_PULLDOWN|GPIO_PORTE|GPIO_PIN14)
#define GPIO_TIM4_CH2OUT (GPIO_ALT|GPIO_AF2|GPIO_SPEED_50MHz|GPIO_OUTPUT_CLEAR|GPIO_PUSHPULL|GPIO_PULLDOWN|GPIO_PORTD|GPIO_PIN13)
#define GPIO_TIM4_CH3OUT (GPIO_ALT|GPIO_AF2|GPIO_SPEED_50MHz|GPIO_OUTPUT_CLEAR|GPIO_PUSHPULL|GPIO_PULLDOWN|GPIO_PORTD|GPIO_PIN14)
#define DIRECT_PWM_OUTPUT_CHANNELS 6
#define GPIO_TIM1_CH1IN GPIO_TIM1_CH1IN_2