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stm32/machine_uart: Change default UART timeout to 0, for non blocking. 

It's more common to need non-blocking behaviour when reading from a UART,
rather than having a large timeout like 1000ms (the original behaviour).
With a large timeout it's 1) likely that the function will read forever if
characters keep trickling it; or 2) the function will unnecessarily wait
when characters come sporadically, eg at a REPL prompt.
This commit is contained in:
Damien George 2019-05-02 22:04:55 +10:00
parent 7e90e22ea5
commit 34942d0a72
2 changed files with 2 additions and 2 deletions
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2
docs/library/pyb.UART.rst
View File

@ -69,7 +69,7 @@ Constructors
Methods Methods
------- -------
.. method:: UART.init(baudrate, bits=8, parity=None, stop=1, \*, timeout=1000, flow=0, timeout_char=0, read_buf_len=64) .. method:: UART.init(baudrate, bits=8, parity=None, stop=1, \*, timeout=0, flow=0, timeout_char=0, read_buf_len=64)
Initialise the UART bus with the given parameters: Initialise the UART bus with the given parameters:

2
ports/stm32/machine_uart.c
View File

@ -224,7 +224,7 @@ STATIC mp_obj_t pyb_uart_init_helper(pyb_uart_obj_t *self, size_t n_args, const
{ MP_QSTR_parity, MP_ARG_OBJ, {.u_rom_obj = MP_ROM_PTR(&mp_const_none_obj)} }, { MP_QSTR_parity, MP_ARG_OBJ, {.u_rom_obj = MP_ROM_PTR(&mp_const_none_obj)} },
{ MP_QSTR_stop, MP_ARG_INT, {.u_int = 1} }, { MP_QSTR_stop, MP_ARG_INT, {.u_int = 1} },
{ MP_QSTR_flow, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = UART_HWCONTROL_NONE} }, { MP_QSTR_flow, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = UART_HWCONTROL_NONE} },
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1000} }, { MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_timeout_char, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} }, { MP_QSTR_timeout_char, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_rxbuf, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} }, { MP_QSTR_rxbuf, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
{ MP_QSTR_read_buf_len, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 64} }, // legacy { MP_QSTR_read_buf_len, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 64} }, // legacy