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esp8266/modpybuart: allow setting baudrate and other params

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This commit is contained in:
Radomir Dopieralski 2016-06-29 14:18:48 +02:00
parent d1b7ba5dc1
commit 35962eaab0
3 changed files with 98 additions and 10 deletions
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101
esp8266/modpybuart.c
View File

@ -36,32 +36,39 @@
#include "py/mperrno.h"
#include "modpyb.h"
// baudrate is currently fixed to this value
#define UART_BAUDRATE (115200)
// UartDev is defined and initialized in rom code.
extern UartDevice UartDev;
typedef struct _pyb_uart_obj_t {
mp_obj_base_t base;
uint8_t uart_id;
uint8_t bits;
uint8_t parity;
uint8_t stop;
uint32_t baudrate;
uint16_t timeout; // timeout waiting for first char (in ms)
uint16_t timeout_char; // timeout waiting between chars (in ms)
} pyb_uart_obj_t;
STATIC const char *_parity_name[] = {"None", "1", "0"};
/******************************************************************************/
// MicroPython bindings for UART
STATIC void pyb_uart_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
pyb_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_printf(print, "UART(%u, baudrate=%u, timeout=%u, timeout_char=%u)",
self->uart_id, UART_BAUDRATE, self->timeout, self->timeout_char);
mp_printf(print, "UART(%u, baudrate=%u, bits=%u, parity=%s, stop=%u, timeout=%u, timeout_char=%u)",
self->uart_id, self->baudrate, self->bits, _parity_name[self->parity],
self->stop, self->timeout, self->timeout_char);
}
STATIC void pyb_uart_init_helper(pyb_uart_obj_t *self, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
enum { ARG_timeout, ARG_timeout_char };
enum { ARG_baudrate, ARG_bits, ARG_parity, ARG_stop, ARG_timeout, ARG_timeout_char };
static const mp_arg_t allowed_args[] = {
//{ MP_QSTR_baudrate, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 9600} },
//{ MP_QSTR_bits, MP_ARG_INT, {.u_int = 8} },
//{ MP_QSTR_parity, MP_ARG_OBJ, {.u_obj = mp_const_none} },
//{ MP_QSTR_stop, MP_ARG_INT, {.u_int = 1} },
{ MP_QSTR_baudrate, MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_bits, MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_parity, MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
{ MP_QSTR_stop, MP_ARG_INT, {.u_int = 0} },
//{ MP_QSTR_tx, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
//{ MP_QSTR_rx, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
@ -70,16 +77,84 @@ STATIC void pyb_uart_init_helper(pyb_uart_obj_t *self, size_t n_args, const mp_o
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);
// set baudrate
if (args[ARG_baudrate].u_int > 0) {
self->baudrate = args[ARG_baudrate].u_int;
UartDev.baut_rate = self->baudrate; // Sic!
}
// set data bits
switch (args[ARG_bits].u_int) {
case 0:
break;
case 5:
UartDev.data_bits = UART_FIVE_BITS;
self->bits = 5;
break;
case 6:
UartDev.data_bits = UART_SIX_BITS;
self->bits = 6;
break;
case 7:
UartDev.data_bits = UART_SEVEN_BITS;
self->bits = 7;
break;
case 8:
UartDev.data_bits = UART_EIGHT_BITS;
self->bits = 8;
break;
default:
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "invalid data bits"));
break;
}
// set parity
if (args[ARG_parity].u_obj != MP_OBJ_NULL) {
if (args[ARG_parity].u_obj == mp_const_none) {
UartDev.parity = UART_NONE_BITS;
self->parity = 0;
} else {
mp_int_t parity = mp_obj_get_int(args[ARG_parity].u_obj);
if (parity & 1) {
UartDev.parity = UART_ODD_BITS;
self->parity = 1;
} else {
UartDev.parity = UART_EVEN_BITS;
self->parity = 2;
}
}
}
// set stop bits
switch (args[ARG_stop].u_int) {
case 0:
break;
case 1:
UartDev.stop_bits = UART_ONE_STOP_BIT;
self->stop = 1;
break;
case 2:
UartDev.stop_bits = UART_TWO_STOP_BIT;
self->stop = 2;
break;
default:
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "invalid stop bits"));
break;
}
// set timeout
self->timeout = args[ARG_timeout].u_int;
// set timeout_char
// make sure it is at least as long as a whole character (13 bits to be safe)
self->timeout_char = args[ARG_timeout_char].u_int;
uint32_t min_timeout_char = 13000 / UART_BAUDRATE + 1;
uint32_t min_timeout_char = 13000 / self->baudrate + 1;
if (self->timeout_char < min_timeout_char) {
self->timeout_char = min_timeout_char;
}
// setup
uart_setup(self->uart_id);
}
STATIC mp_obj_t pyb_uart_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
@ -95,6 +170,12 @@ STATIC mp_obj_t pyb_uart_make_new(const mp_obj_type_t *type, size_t n_args, size
pyb_uart_obj_t *self = m_new_obj(pyb_uart_obj_t);
self->base.type = &pyb_uart_type;
self->uart_id = uart_id;
self->baudrate = 115200;
self->bits = 8;
self->parity = 0;
self->stop = 1;
self->timeout = 0;
self->timeout_char = 0;
// init the peripheral
mp_map_t kw_args;

6
esp8266/uart.c
View File

@ -237,6 +237,12 @@ void ICACHE_FLASH_ATTR uart_reattach() {
uart_init(UART_BIT_RATE_74880, UART_BIT_RATE_74880);
}
void ICACHE_FLASH_ATTR uart_setup(uint8 uart) {
ETS_UART_INTR_DISABLE();
uart_config(uart);
ETS_UART_INTR_ENABLE();
}
// Task-based UART interface
#include "py/obj.h"

1
esp8266/uart.h
View File

@ -96,5 +96,6 @@ int uart_rx_char(void);
void uart_tx_one_char(uint8 uart, uint8 TxChar);
void uart_flush(uint8 uart);
void uart_os_config(int uart);
void uart_setup(uint8 uart);
#endif // _INCLUDED_UART_H_