diff --git a/lib/led_tm1637.c b/lib/led_tm1637.c
index 2d47ac9..8cb5be0 100644
--- a/lib/led_tm1637.c
+++ b/lib/led_tm1637.c
@@ -178,7 +178,7 @@ void led_tm1637_setup(void)
 	timer_reset(TIM(LED_TM1637_TIMER)); // reset timer state
 	timer_set_mode(TIM(LED_TM1637_TIMER), TIM_CR1_CKD_CK_INT, TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP); // set timer mode, use undivided timer clock, edge alignment (simple count), and count up
 	timer_set_prescaler(TIM(LED_TM1637_TIMER), 0); // don't prescale to get most precise timing ( 1/(72E6/1/(2**16))=0.91 ms > 0.5 us )
-	timer_set_period(TIM(LED_TM1637_TIMER), 500); // set the clock frequency (500 kHz is the maximum per datasheet, but also because of the bit banging implementation)
+	timer_set_period(TIM(LED_TM1637_TIMER), rcc_ahb_frequency/50000/2); // set the clock frequency to 50 kHz (500 kHz is the maximum per datasheet, but 50 kHz is empirically more stable due to the line capacitance of the multiple displays)
 	timer_clear_flag(TIM(LED_TM1637_TIMER), TIM_SR_UIF); // clear flag
 	timer_update_on_overflow(TIM(LED_TM1637_TIMER)); // only use counter overflow as UEV source (use overflow as start time or timeout)
 }
@@ -205,12 +205,12 @@ static bool led_tm1637_write(const uint8_t* data, uint8_t length)
 	}
 
 	// enable timer for signal generation
+	gpio_set_mode(GPIO(LED_TM1637_DIO_PORT), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO(LED_TM1637_DIO_PIN)); // ensure we can output to sent start condition
 	timer_set_counter(TIM(LED_TM1637_TIMER), 0); // reset timer counter
 	timer_enable_counter(TIM(LED_TM1637_TIMER)); // enable timer to generate timing
 	led_tm1637_tick(); // wait to enforce minimum time since last write
 
 	// send start condition (DIO then CLK low)
-	gpio_set_mode(GPIO(LED_TM1637_DIO_PORT), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO(LED_TM1637_DIO_PIN)); // ensure we can output to sent start condition
 	gpio_clear(GPIO(LED_TM1637_DIO_PORT), GPIO(LED_TM1637_DIO_PIN)); // put DIO low
 	led_tm1637_tick(); // wait for next tick
 	gpio_clear(GPIO(LED_TM1637_CLK_PORT), GPIO(LED_TM1637_CLK_PIN)); // put CLK low