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esp8266: Implement UART.read functionality.

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This commit is contained in:
Damien George 2016-04-21 15:19:19 +01:00
parent 7652ab77ef
commit d46bea9ffa
1 changed files with 57 additions and 18 deletions
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75
esp8266/modpybuart.c
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@ -36,9 +36,14 @@
#include "py/stream.h"
#include "modpyb.h"
// baudrate is currently fixed to this value
#define UART_BAUDRATE (115200)
typedef struct _pyb_uart_obj_t {
mp_obj_base_t base;
uint8_t uart_id;
uint16_t timeout; // timeout waiting for first char (in ms)
uint16_t timeout_char; // timeout waiting between chars (in ms)
} pyb_uart_obj_t;
/******************************************************************************/
@ -46,24 +51,35 @@ typedef struct _pyb_uart_obj_t {
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)", self->uart_id);
mp_printf(print, "UART(%u, baudrate=%u, timeout=%u, timeout_char=%u)",
self->uart_id, UART_BAUDRATE, 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_baudrate, ARG_bits, ARG_parity, ARG_stop };
enum { 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_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_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_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} },
{ MP_QSTR_timeout_char, 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);
*/
// not implemented
// 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;
if (self->timeout_char < min_timeout_char) {
self->timeout_char = min_timeout_char;
}
}
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) {
@ -80,12 +96,10 @@ STATIC mp_obj_t pyb_uart_make_new(const mp_obj_type_t *type, size_t n_args, size
self->base.type = &pyb_uart_type;
self->uart_id = uart_id;
if (n_args > 1 || n_kw > 0) {
// init the peripheral
mp_map_t kw_args;
mp_map_init_fixed_table(&kw_args, n_kw, args + n_args);
pyb_uart_init_helper(self, n_args - 1, args + 1, &kw_args);
}
// init the peripheral
mp_map_t kw_args;
mp_map_init_fixed_table(&kw_args, n_kw, args + n_args);
pyb_uart_init_helper(self, n_args - 1, args + 1, &kw_args);
return MP_OBJ_FROM_PTR(self);
}
@ -109,7 +123,32 @@ STATIC const mp_rom_map_elem_t pyb_uart_locals_dict_table[] = {
STATIC MP_DEFINE_CONST_DICT(pyb_uart_locals_dict, pyb_uart_locals_dict_table);
STATIC mp_uint_t pyb_uart_read(mp_obj_t self_in, void *buf_in, mp_uint_t size, int *errcode) {
mp_not_implemented("reading from UART");
pyb_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
if (self->uart_id == 1) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError, "UART(1) can't read"));
}
// make sure we want at least 1 char
if (size == 0) {
return 0;
}
// wait for first char to become available
if (!uart_rx_wait(self->timeout * 1000)) {
*errcode = EAGAIN;
return MP_STREAM_ERROR;
}
// read the data
uint8_t *buf = buf_in;
for (;;) {
*buf++ = uart_rx_char();
if (--size == 0 || !uart_rx_wait(self->timeout_char * 1000)) {
// return number of bytes read
return buf - (uint8_t*)buf_in;
}
}
}
STATIC mp_uint_t pyb_uart_write(mp_obj_t self_in, const void *buf_in, mp_uint_t size, int *errcode) {