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tmc_uart: Increase default UART rate to 40000 on 32bit MCUs 

A higher UART baud rate will allow for faster transfers and may result
in more stable operation in general.  Increase the baud to 40000 on
32bit MCUs and leave the baud at 9000 baud for 8bit AVR MCUs.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2021-07-20 15:27:12 -04:00
parent b4fec8502c
commit 0075b29081
1 changed files with 7 additions and 2 deletions
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9
klippy/extras/tmc_uart.py
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@ -70,7 +70,8 @@ def lookup_tmc_uart_mutex(mcu):
pmutexes.mcu_to_mutex[mcu] = mutex
return mutex
TMC_BAUD_RATE = 9000
TMC_BAUD_RATE = 40000
TMC_BAUD_RATE_AVR = 9000
# Code for sending messages on a TMC uart
class MCU_TMC_uart_bitbang:
@ -90,7 +91,11 @@ class MCU_TMC_uart_bitbang:
self.tmcuart_send_cmd = None
self.mcu.register_config_callback(self.build_config)
def build_config(self):
bit_ticks = self.mcu.seconds_to_clock(1. / TMC_BAUD_RATE)
baud = TMC_BAUD_RATE
mcu_type = self.mcu.get_constants().get("MCU", "")
if mcu_type.startswith("atmega") or mcu_type.startswith("at90usb"):
baud = TMC_BAUD_RATE_AVR
bit_ticks = self.mcu.seconds_to_clock(1. / baud)
self.mcu.add_config_cmd(
"config_tmcuart oid=%d rx_pin=%s pull_up=%d tx_pin=%s bit_time=%d"
% (self.oid, self.rx_pin, self.pullup, self.tx_pin, bit_ticks))