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esp32/machine_uart: Add ability to invert UART pins.

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This commit is contained in:
Jeremy Herbert 2019-10-10 05:11:01 -07:00 committed by Damien George
parent 69b238ec63
commit 7a7ee16ccf
1 changed files with 45 additions and 2 deletions
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47
ports/esp32/machine_uart.c
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@ -50,6 +50,7 @@ typedef struct _machine_uart_obj_t {
uint16_t rxbuf;
uint16_t timeout; // timeout waiting for first char (in ms)
uint16_t timeout_char; // timeout waiting between chars (in ms)
uint32_t invert; // lines to invert
} machine_uart_obj_t;
STATIC const char *_parity_name[] = {"None", "1", "0"};
@ -61,13 +62,42 @@ STATIC void machine_uart_print(const mp_print_t *print, mp_obj_t self_in, mp_pri
machine_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
uint32_t baudrate;
uart_get_baudrate(self->uart_num, &baudrate);
mp_printf(print, "UART(%u, baudrate=%u, bits=%u, parity=%s, stop=%u, tx=%d, rx=%d, rts=%d, cts=%d, txbuf=%u, rxbuf=%u, timeout=%u, timeout_char=%u)",
mp_printf(print, "UART(%u, baudrate=%u, bits=%u, parity=%s, stop=%u, tx=%d, rx=%d, rts=%d, cts=%d, txbuf=%u, rxbuf=%u, timeout=%u, timeout_char=%u",
self->uart_num, baudrate, self->bits, _parity_name[self->parity],
self->stop, self->tx, self->rx, self->rts, self->cts, self->txbuf, self->rxbuf, self->timeout, self->timeout_char);
if (self->invert) {
mp_printf(print, ", invert=");
uint32_t invert_mask = self->invert;
if (invert_mask & UART_INVERSE_TXD) {
mp_printf(print, "INV_TX");
invert_mask &= ~UART_INVERSE_TXD;
if (invert_mask) {
mp_printf(print, "|");
}
}
if (invert_mask & UART_INVERSE_RXD) {
mp_printf(print, "INV_RX");
invert_mask &= ~UART_INVERSE_RXD;
if (invert_mask) {
mp_printf(print, "|");
}
}
if (invert_mask & UART_INVERSE_RTS) {
mp_printf(print, "INV_RTS");
invert_mask &= ~UART_INVERSE_RTS;
if (invert_mask) {
mp_printf(print, "|");
}
}
if (invert_mask & UART_INVERSE_CTS) {
mp_printf(print, "INV_CTS");
}
}
mp_printf(print, ")");
}
STATIC void machine_uart_init_helper(machine_uart_obj_t *self, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
enum { ARG_baudrate, ARG_bits, ARG_parity, ARG_stop, ARG_tx, ARG_rx, ARG_rts, ARG_cts, ARG_txbuf, ARG_rxbuf, ARG_timeout, ARG_timeout_char };
enum { ARG_baudrate, ARG_bits, ARG_parity, ARG_stop, ARG_tx, ARG_rx, ARG_rts, ARG_cts, ARG_txbuf, ARG_rxbuf, ARG_timeout, ARG_timeout_char, ARG_invert };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_baudrate, MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_bits, MP_ARG_INT, {.u_int = 0} },
@ -81,6 +111,7 @@ STATIC void machine_uart_init_helper(machine_uart_obj_t *self, size_t n_args, co
{ MP_QSTR_rxbuf, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
{ 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_invert, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
};
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
@ -205,6 +236,13 @@ STATIC void machine_uart_init_helper(machine_uart_obj_t *self, size_t n_args, co
if (self->timeout_char < min_timeout_char) {
self->timeout_char = min_timeout_char;
}
// set line inversion
if (args[ARG_invert].u_int & ~UART_LINE_INV_MASK) {
mp_raise_ValueError("invalid inversion mask");
}
self->invert = args[ARG_invert].u_int;
uart_set_line_inverse(self->uart_num, self->invert);
}
STATIC mp_obj_t machine_uart_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
@ -341,6 +379,11 @@ STATIC const mp_rom_map_elem_t machine_uart_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_stream_readinto_obj) },
{ MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&mp_stream_write_obj) },
{ MP_ROM_QSTR(MP_QSTR_sendbreak), MP_ROM_PTR(&machine_uart_sendbreak_obj) },
{ MP_ROM_QSTR(MP_QSTR_INV_TX), MP_ROM_INT(UART_INVERSE_TXD) },
{ MP_ROM_QSTR(MP_QSTR_INV_RX), MP_ROM_INT(UART_INVERSE_RXD) },
{ MP_ROM_QSTR(MP_QSTR_INV_RTS), MP_ROM_INT(UART_INVERSE_RTS) },
{ MP_ROM_QSTR(MP_QSTR_INV_CTS), MP_ROM_INT(UART_INVERSE_CTS) },
};
STATIC MP_DEFINE_CONST_DICT(machine_uart_locals_dict, machine_uart_locals_dict_table);