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machuart.c: Add an option to invert the UART signals #310

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machuart.c: Add an option to invert the UART signals #310

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11 changes: 11 additions & 0 deletions esp32/mods/machuart.c
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Original file line number Diff line number Diff line change
Expand Up @@ -426,6 +426,11 @@ STATIC mp_obj_t mach_uart_init_helper(mach_uart_obj_t *self, const mp_arg_val_t
self->config.rx_flow_ctrl_thresh = 64;
uart_param_config(self->uart_id, &self->config);

uint32_t inverse_mask = args[6].u_int;
if (inverse_mask != 0) {
uart_set_line_inverse(self->uart_id, inverse_mask << 19);
}

// install the UART driver
uart_driver_install(self->uart_id, MACHUART_RX_BUFFER_LEN, 0, 0, NULL, 0, UARTRxCallback);

Expand All @@ -452,6 +457,7 @@ STATIC const mp_arg_t mach_uart_init_args[] = {
{ MP_QSTR_stop, MP_ARG_OBJ, {.u_obj = mp_const_none} },
{ MP_QSTR_pins, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
{ MP_QSTR_timeout_chars, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 2} },
{ MP_QSTR_inverse_mask, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
};
STATIC mp_obj_t mach_uart_make_new(const mp_obj_type_t *type, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *all_args) {
// parse args
Expand Down Expand Up @@ -588,6 +594,11 @@ STATIC const mp_map_elem_t mach_uart_locals_dict_table[] = {
// class constants
{ MP_OBJ_NEW_QSTR(MP_QSTR_EVEN), MP_OBJ_NEW_SMALL_INT(UART_PARITY_EVEN) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_ODD), MP_OBJ_NEW_SMALL_INT(UART_PARITY_ODD) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_INVERSE_RXD), MP_OBJ_NEW_SMALL_INT(0x01) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_INVERSE_CTS), MP_OBJ_NEW_SMALL_INT(0x02) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_INVERSE_TXD), MP_OBJ_NEW_SMALL_INT(0x08) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_INVERSE_RTS), MP_OBJ_NEW_SMALL_INT(0x10) },

// { MP_OBJ_NEW_QSTR(MP_QSTR_RX_ANY), MP_OBJ_NEW_SMALL_INT(2) },
};
STATIC MP_DEFINE_CONST_DICT(mach_uart_locals_dict, mach_uart_locals_dict_table);
Expand Down