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stmhal: Add USB_VCP class/object, for direct USB VCP control.

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Before, pyb.stdin/pyb.stdout allowed some kind of access to the USB VCP
device, but it was basic access.

This patch adds a proper USB_VCP class and object with much more control
over the USB VCP device.  Create an object with pyb.USB_VCP(), then use
this object as if it were a UART object.  It has send, recv, read,
write, and other methods.  send and recv allow a timeout to be specified.

Addresses issue 774.
This commit is contained in:
Damien George 2014-07-31 10:30:42 +01:00
parent 5f27a7e811
commit 3c4db9f91c
7 changed files with 227 additions and 29 deletions
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1
stmhal/modpyb.c
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@ -367,6 +367,7 @@ STATIC const mp_map_elem_t pyb_module_globals_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR_have_cdc), (mp_obj_t)&pyb_have_cdc_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_repl_uart), (mp_obj_t)&pyb_repl_uart_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_hid), (mp_obj_t)&pyb_hid_send_report_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_USB_VCP), (mp_obj_t)&pyb_usb_vcp_type },
{ MP_OBJ_NEW_QSTR(MP_QSTR_millis), (mp_obj_t)&pyb_millis_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_delay), (mp_obj_t)&pyb_delay_obj },

6
stmhal/pybstdio.c
View File

@ -84,8 +84,10 @@ int stdin_rx_chr(void) {
}
#endif
#endif
if (usb_vcp_rx_num() != 0) {
return usb_vcp_rx_get();
byte c;
if (usb_vcp_recv_byte(&c) != 0) {
return c;
} else if (pyb_stdio_uart != PYB_UART_NONE && uart_rx_any(pyb_stdio_uart)) {
return uart_rx_char(pyb_stdio_uart);
}

6
stmhal/qstrdefsport.h
View File

@ -71,6 +71,12 @@ Q(millis)
Q(seek)
Q(tell)
// for USB VCP class
Q(USB_VCP)
Q(send)
Q(recv)
Q(timeout)
// for RTC class
Q(RTC)
Q(info)

158
stmhal/usb.c
View File

@ -32,10 +32,13 @@
#include "usbd_cdc_interface.h"
#include "usbd_msc_storage.h"
#include "misc.h"
#include "mpconfig.h"
#include "misc.h"
#include "qstr.h"
#include "obj.h"
#include "runtime.h"
#include "stream.h"
#include "bufhelper.h"
#include "usb.h"
#ifdef USE_DEVICE_MODE
@ -99,18 +102,14 @@ void usb_vcp_set_interrupt_char(int c) {
}
}
int usb_vcp_rx_num(void) {
return USBD_CDC_RxNum();
}
char usb_vcp_rx_get(void) {
return USBD_CDC_RxGet();
int usb_vcp_recv_byte(uint8_t *c) {
return USBD_CDC_Rx(c, 1, 0);
}
void usb_vcp_send_strn(const char *str, int len) {
#ifdef USE_DEVICE_MODE
if (dev_is_enabled) {
USBD_CDC_Tx(str, len);
USBD_CDC_TxAlways((const uint8_t*)str, len);
}
#endif
}
@ -120,9 +119,9 @@ void usb_vcp_send_strn_cooked(const char *str, int len) {
if (dev_is_enabled) {
for (const char *top = str + len; str < top; str++) {
if (*str == '\n') {
USBD_CDC_Tx("\r\n", 2);
USBD_CDC_TxAlways((const uint8_t*)"\r\n", 2);
} else {
USBD_CDC_Tx(str, 1);
USBD_CDC_TxAlways((const uint8_t*)str, 1);
}
}
}
@ -135,6 +134,145 @@ void usb_hid_send_report(uint8_t *buf) {
#endif
}
/******************************************************************************/
// Micro Python bindings for USB VCP
typedef struct _pyb_usb_vcp_obj_t {
mp_obj_base_t base;
} pyb_usb_vcp_obj_t;
STATIC const pyb_usb_vcp_obj_t pyb_usb_vcp_obj = {{&pyb_usb_vcp_type}};
STATIC void pyb_usb_vcp_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
print(env, "USB_VCP()");
}
STATIC mp_obj_t pyb_usb_vcp_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
// check arguments
mp_arg_check_num(n_args, n_kw, 0, 0, false);
// return the USB VCP object
return (mp_obj_t)&pyb_usb_vcp_obj;
}
/// \method any()
/// Return `True` if any characters waiting, else `False`.
STATIC mp_obj_t pyb_usb_vcp_any(mp_obj_t self_in) {
if (USBD_CDC_RxNum() > 0) {
return mp_const_true;
} else {
return mp_const_false;
}
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_usb_vcp_any_obj, pyb_usb_vcp_any);
/// \method send(data, *, timeout=5000)
/// Send data over the USB VCP:
///
/// - `data` is the data to send (an integer to send, or a buffer object).
/// - `timeout` is the timeout in milliseconds to wait for the send.
///
/// Return value: number of bytes sent.
STATIC const mp_arg_t pyb_usb_vcp_send_args[] = {
{ MP_QSTR_data, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
};
#define PYB_USB_VCP_SEND_NUM_ARGS MP_ARRAY_SIZE(pyb_usb_vcp_send_args)
STATIC mp_obj_t pyb_usb_vcp_send(uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
// parse args
mp_arg_val_t vals[PYB_USB_VCP_SEND_NUM_ARGS];
mp_arg_parse_all(n_args - 1, args + 1, kw_args, PYB_USB_VCP_SEND_NUM_ARGS, pyb_usb_vcp_send_args, vals);
// get the buffer to send from
mp_buffer_info_t bufinfo;
uint8_t data[1];
pyb_buf_get_for_send(vals[0].u_obj, &bufinfo, data);
// send the data
int ret = USBD_CDC_Tx(bufinfo.buf, bufinfo.len, vals[1].u_int);
return mp_obj_new_int(ret);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_usb_vcp_send_obj, 1, pyb_usb_vcp_send);
/// \method recv(data, *, timeout=5000)
///
/// Receive data on the bus:
///
/// - `data` can be an integer, which is the number of bytes to receive,
/// or a mutable buffer, which will be filled with received bytes.
/// - `timeout` is the timeout in milliseconds to wait for the receive.
///
/// Return value: if `data` is an integer then a new buffer of the bytes received,
/// otherwise the number of bytes read into `data` is returned.
STATIC mp_obj_t pyb_usb_vcp_recv(uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
// parse args
mp_arg_val_t vals[PYB_USB_VCP_SEND_NUM_ARGS];
mp_arg_parse_all(n_args - 1, args + 1, kw_args, PYB_USB_VCP_SEND_NUM_ARGS, pyb_usb_vcp_send_args, vals);
// get the buffer to receive into
mp_buffer_info_t bufinfo;
mp_obj_t o_ret = pyb_buf_get_for_recv(vals[0].u_obj, &bufinfo);
// receive the data
int ret = USBD_CDC_Rx(bufinfo.buf, bufinfo.len, vals[1].u_int);
// return the received data
if (o_ret == MP_OBJ_NULL) {
return mp_obj_new_int(ret); // number of bytes read into given buffer
} else {
return mp_obj_str_builder_end_with_len(o_ret, ret); // create a new buffer
}
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_usb_vcp_recv_obj, 1, pyb_usb_vcp_recv);
STATIC mp_uint_t pyb_usb_vcp_read(mp_obj_t self_in, void *buf, mp_uint_t size, int *errcode) {
int ret = USBD_CDC_Rx((byte*)buf, size, -1);
return ret;
}
STATIC mp_uint_t pyb_usb_vcp_write(mp_obj_t self_in, const void *buf, mp_uint_t size, int *errcode) {
int ret = USBD_CDC_Tx((const byte*)buf, size, -1);
return ret;
}
mp_obj_t pyb_usb_vcp___exit__(uint n_args, const mp_obj_t *args) {
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_usb_vcp___exit___obj, 4, 4, pyb_usb_vcp___exit__);
STATIC const mp_map_elem_t pyb_usb_vcp_locals_dict_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR_send), (mp_obj_t)&pyb_usb_vcp_send_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_recv), (mp_obj_t)&pyb_usb_vcp_recv_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_read), (mp_obj_t)&mp_stream_read_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_readall), (mp_obj_t)&mp_stream_readall_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_readline), (mp_obj_t)&mp_stream_unbuffered_readline_obj},
{ MP_OBJ_NEW_QSTR(MP_QSTR_write), (mp_obj_t)&mp_stream_write_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_close), (mp_obj_t)&mp_identity_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR___del__), (mp_obj_t)&mp_identity_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR___enter__), (mp_obj_t)&mp_identity_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR___exit__), (mp_obj_t)&pyb_usb_vcp___exit___obj },
};
STATIC MP_DEFINE_CONST_DICT(pyb_usb_vcp_locals_dict, pyb_usb_vcp_locals_dict_table);
STATIC const mp_stream_p_t pyb_usb_vcp_stream_p = {
.read = pyb_usb_vcp_read,
.write = pyb_usb_vcp_write,
};
const mp_obj_type_t pyb_usb_vcp_type = {
{ &mp_type_type },
.name = MP_QSTR_USB_VCP,
.print = pyb_usb_vcp_print,
.make_new = pyb_usb_vcp_make_new,
.getiter = mp_identity,
.iternext = mp_stream_unbuffered_iter,
.stream_p = &pyb_usb_vcp_stream_p,
.locals_dict = (mp_obj_t)&pyb_usb_vcp_locals_dict,
};
/******************************************************************************/
// code for experimental USB OTG support

5
stmhal/usb.h
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@ -41,13 +41,14 @@ typedef enum {
USB_STORAGE_MEDIUM_SDCARD,
} usb_storage_medium_t;
const mp_obj_type_t pyb_usb_vcp_type;
void pyb_usb_dev_init(usb_device_mode_t mode, usb_storage_medium_t medium);
void pyb_usb_dev_stop(void);
bool usb_vcp_is_enabled(void);
bool usb_vcp_is_connected(void);
void usb_vcp_set_interrupt_char(int c);
int usb_vcp_rx_num(void);
char usb_vcp_rx_get(void);
int usb_vcp_recv_byte(uint8_t *c);
void usb_vcp_send_strn(const char* str, int len);
void usb_vcp_send_strn_cooked(const char *str, int len);
void usb_hid_send_report(uint8_t *buf); // 4 bytes for mouse: ?, x, y, ?

69
stmhal/usbd_cdc_interface.c
View File

@ -33,11 +33,18 @@
*/
/* Includes ------------------------------------------------------------------*/
#include <stdbool.h>
#include "stm32f4xx_hal.h"
#include "usbd_cdc_msc_hid.h"
#include "usbd_cdc_interface.h"
#include "pendsv.h"
#include "mpconfig.h"
#include "misc.h"
#include "qstr.h"
#include "obj.h"
#include "usb.h"
// CDC control commands
@ -59,7 +66,7 @@
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
static uint8_t dev_is_connected = 0; // indicates if we are connected
static __IO uint8_t dev_is_connected = 0; // indicates if we are connected
static uint8_t UserRxBuffer[APP_RX_DATA_SIZE]; // received data from USB OUT endpoint is stored in this buffer
static uint16_t UserRxBufCur = 0; // points to next available character in UserRxBuffer
@ -399,7 +406,34 @@ void USBD_CDC_SetInterrupt(int chr, void *data) {
user_interrupt_data = data;
}
void USBD_CDC_Tx(const char *str, uint32_t len) {
// timout in milliseconds.
// Returns number of bytes written to the device.
int USBD_CDC_Tx(const uint8_t *buf, uint32_t len, uint32_t timeout) {
for (uint32_t i = 0; i < len; i++) {
// Wait until the device is connected and the buffer has space, with a given timeout
uint32_t start = HAL_GetTick();
while (!dev_is_connected || ((UserTxBufPtrIn + 1) & (APP_TX_DATA_SIZE - 1)) == UserTxBufPtrOut) {
// Wraparound of tick is taken care of by 2's complement arithmetic.
if (HAL_GetTick() - start >= timeout) {
// timeout
return i;
}
__WFI(); // enter sleep mode, waiting for interrupt
}
// Write data to device buffer
UserTxBuffer[UserTxBufPtrIn] = buf[i];
UserTxBufPtrIn = (UserTxBufPtrIn + 1) & (APP_TX_DATA_SIZE - 1);
}
// Success, return number of bytes read
return len;
}
// Always write all of the data to the device tx buffer, even if the
// device is not connected, or if the buffer is full. Has a small timeout
// to wait for the buffer to be drained, in the case the device is connected.
void USBD_CDC_TxAlways(const uint8_t *buf, uint32_t len) {
for (int i = 0; i < len; i++) {
// If the CDC device is not connected to the host then we don't have anyone to receive our data.
// The device may become connected in the future, so we should at least try to fill the buffer
@ -433,23 +467,36 @@ void USBD_CDC_Tx(const char *str, uint32_t len) {
*/
}
UserTxBuffer[UserTxBufPtrIn] = str[i];
UserTxBuffer[UserTxBufPtrIn] = buf[i];
UserTxBufPtrIn = (UserTxBufPtrIn + 1) & (APP_TX_DATA_SIZE - 1);
}
}
// Returns number of bytes in the rx buffer.
int USBD_CDC_RxNum(void) {
return UserRxBufLen - UserRxBufCur;
}
int USBD_CDC_RxGet(void) {
// wait for buffer to have at least 1 character in it
while (USBD_CDC_RxNum() == 0) {
__WFI();
// timout in milliseconds.
// Returns number of bytes read from the device.
int USBD_CDC_Rx(uint8_t *buf, uint32_t len, uint32_t timeout) {
// loop to read bytes
for (uint32_t i = 0; i < len; i++) {
// Wait until we have at least 1 byte to read
uint32_t start = HAL_GetTick();
while (!dev_is_connected || UserRxBufLen == UserRxBufCur) {
// Wraparound of tick is taken care of by 2's complement arithmetic.
if (HAL_GetTick() - start >= timeout) {
// timeout
return i;
}
__WFI(); // enter sleep mode, waiting for interrupt
}
// Copy byte from device to user buffer
buf[i] = UserRxBuffer[UserRxBufCur++];
}
// get next character
int c = UserRxBuffer[UserRxBufCur++];
return c;
// Success, return number of bytes read
return len;
}

11
stmhal/usbd_cdc_interface.h
View File

@ -20,8 +20,8 @@
*
* http://www.st.com/software_license_agreement_liberty_v2
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
@ -36,6 +36,9 @@ void USBD_CDC_HAL_TIM_PeriodElapsedCallback(void);
int USBD_CDC_IsConnected(void);
void USBD_CDC_SetInterrupt(int chr, void *data);
void USBD_CDC_Tx(const char *str, uint32_t len);
int USBD_CDC_Tx(const uint8_t *buf, uint32_t len, uint32_t timeout);
void USBD_CDC_TxAlways(const uint8_t *buf, uint32_t len);
int USBD_CDC_RxNum(void);
int USBD_CDC_RxGet(void);
int USBD_CDC_Rx(uint8_t *buf, uint32_t len, uint32_t timeout);