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cc3200: Make I2C and SPI API the same as in stmhal.

pull/1401/merge
Daniel Campora 9 years ago
parent
3a2fb201a5
commit
c6926c374d
5 changed files with 126 additions and 211 deletions
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  1. 3
      cc3200/mods/pybi2c.c
  2. 83
      cc3200/mods/pybspi.c
  3. 2
      cc3200/qstrdefsport.h
  4. 162
      docs/library/pyb.I2C.rst
  5. 87
      docs/library/pyb.SPI.rst

3
cc3200/mods/pybi2c.c
View File

@ -380,6 +380,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_i2c_scan_obj, pyb_i2c_scan);
STATIC const mp_arg_t pyb_i2c_send_args[] = {
{ MP_QSTR_send, MP_ARG_REQUIRED | MP_ARG_OBJ, },
{ MP_QSTR_addr, MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
};
#define PYB_I2C_SEND_NUM_ARGS MP_ARRAY_SIZE(pyb_i2c_send_args)
@ -415,6 +416,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_i2c_send_obj, 1, pyb_i2c_send);
STATIC const mp_arg_t pyb_i2c_recv_args[] = {
{ MP_QSTR_recv, MP_ARG_REQUIRED | MP_ARG_OBJ, },
{ MP_QSTR_addr, MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
};
#define PYB_I2C_RECV_NUM_ARGS MP_ARRAY_SIZE(pyb_i2c_recv_args)
@ -457,6 +459,7 @@ STATIC const mp_arg_t pyb_i2c_mem_read_args[] = {
{ MP_QSTR_data, MP_ARG_REQUIRED | MP_ARG_OBJ, },
{ MP_QSTR_addr, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_memaddr, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
{ MP_QSTR_addr_size, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 8} },
};
#define PYB_I2C_MEM_READ_NUM_ARGS MP_ARRAY_SIZE(pyb_i2c_mem_read_args)

83
cc3200/mods/pybspi.c
View File

@ -171,13 +171,12 @@ STATIC void pyb_spi_print(const mp_print_t *print, mp_obj_t self_in, mp_print_ki
mp_printf(print, "<SPI1, SPI.MASTER, baudrate=%u, bits=%u, polarity=%u, phase=%u, nss=%q>",
self->baudrate, (self->wlen * 8), self->polarity, self->phase,
(self->config & SPI_CS_ACTIVELOW) ? MP_QSTR_ACTIVE_LOW : MP_QSTR_ACTIVE_HIGH);
}
else {
} else {
mp_print_str(print, "<SPI1>");
}
}
/// \method init(mode, *, baudrate=1000000, bits=8, polarity=0, phase=0, nss=SPI.ACTIVELOW)
/// \method init(mode, *, baudrate=1000000, bits=8, polarity=0, phase=0, nss=SPI.ACTIVE_LOW)
///
/// Initialise the SPI bus with the given parameters:
///
@ -260,7 +259,6 @@ invalid_args:
/// initialised (it has the settings from the last initialisation of
/// the bus, if any). If extra arguments are given, the bus is initialised.
/// See `init` for parameters of initialisation.
///
STATIC mp_obj_t pyb_spi_make_new(mp_obj_t type_in, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
// check arguments
mp_arg_check_num(n_args, n_kw, 1, MP_OBJ_FUN_ARGS_MAX, true);
@ -297,39 +295,59 @@ STATIC mp_obj_t pyb_spi_deinit(mp_obj_t self_in) {
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_spi_deinit_obj, pyb_spi_deinit);
/// \method send(send)
/// \method send(send, *, timeout=5000)
/// Send data on the bus:
///
/// - `send` is the data to send (a byte to send, or a buffer object).
/// - `timeout` is the timeout in milliseconds to wait for the send.
///
STATIC mp_obj_t pyb_spi_send (mp_obj_t self_in, mp_obj_t send_o) {
pyb_spi_obj_t *self = self_in;
STATIC mp_obj_t pyb_spi_send (mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_send, MP_ARG_REQUIRED | MP_ARG_OBJ, },
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
};
// parse args
pyb_spi_obj_t *self = pos_args[0];
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
// get the buffer to send from
mp_buffer_info_t bufinfo;
uint8_t data[1];
pyb_buf_get_for_send(send_o, &bufinfo, data);
pyb_buf_get_for_send(args[0].u_obj, &bufinfo, data);
// just send
pybspi_transfer(self, (const char *)bufinfo.buf, NULL, bufinfo.len);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(pyb_spi_send_obj, pyb_spi_send);
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_spi_send_obj, 1, pyb_spi_send);
/// \method recv(recv)
/// \method recv(recv, *, timeout=5000)
///
/// Receive data on the bus:
///
/// - `recv` 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: if `recv` is an integer then a new buffer of the bytes received,
/// otherwise the same buffer that was passed in to `recv`.
STATIC mp_obj_t pyb_spi_recv(mp_obj_t self_in, mp_obj_t recv_o) {
pyb_spi_obj_t *self = self_in;
STATIC mp_obj_t pyb_spi_recv(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_recv, MP_ARG_REQUIRED | MP_ARG_OBJ, },
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
};
// parse args
pyb_spi_obj_t *self = pos_args[0];
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
// get the buffer to receive into
vstr_t vstr;
mp_obj_t o_ret = pyb_buf_get_for_recv(recv_o, &vstr);
mp_obj_t o_ret = pyb_buf_get_for_recv(args[0].u_obj, &vstr);
// just receive
pybspi_transfer(self, NULL, vstr.buf, vstr.len);
@ -341,9 +359,9 @@ STATIC mp_obj_t pyb_spi_recv(mp_obj_t self_in, mp_obj_t recv_o) {
return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
}
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(pyb_spi_recv_obj, pyb_spi_recv);
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_spi_recv_obj, 1, pyb_spi_recv);
/// \method send_recv(send, recv)
/// \method send_recv(send, recv=None, *, timeout=5000)
///
/// Send and receive data on the bus at the same time:
///
@ -351,10 +369,20 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_2(pyb_spi_recv_obj, pyb_spi_recv);
/// - `recv` is a mutable buffer which will be filled with received bytes.
/// It can be the same as `send`, or omitted. If omitted, a new buffer will
/// be created.
/// - `timeout` is the timeout in milliseconds to wait for the transaction to complete.
///
/// Return: the buffer with the received bytes.
STATIC mp_obj_t pyb_spi_send_recv (mp_uint_t n_args, const mp_obj_t *args) {
pyb_spi_obj_t *self = args[0];
STATIC mp_obj_t pyb_spi_send_recv (mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_send, MP_ARG_REQUIRED | MP_ARG_OBJ, },
{ MP_QSTR_recv, MP_ARG_OBJ, {.u_obj = mp_const_none} },
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
};
// parse args
pyb_spi_obj_t *self = pos_args[0];
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
// get buffers to send from/receive to
mp_buffer_info_t bufinfo_send;
@ -363,35 +391,34 @@ STATIC mp_obj_t pyb_spi_send_recv (mp_uint_t n_args, const mp_obj_t *args) {
vstr_t vstr_recv;
mp_obj_t o_ret;
if (args[1] == args[2]) {
if (args[0].u_obj == args[1].u_obj) {
// same object for sending and receiving, it must be a r/w buffer
mp_get_buffer_raise(args[1], &bufinfo_send, MP_BUFFER_RW);
mp_get_buffer_raise(args[0].u_obj, &bufinfo_send, MP_BUFFER_RW);
bufinfo_recv = bufinfo_send;
o_ret = args[1];
o_ret = args[0].u_obj;
} else {
// get the buffer to send from
pyb_buf_get_for_send(args[1], &bufinfo_send, data_send);
pyb_buf_get_for_send(args[0].u_obj, &bufinfo_send, data_send);
// get the buffer to receive into
if (n_args == 2) {
if (args[1].u_obj == mp_const_none) {
// only the send was argument given, so create a fresh buffer of the send length
vstr_init_len(&vstr_recv, bufinfo_send.len);
bufinfo_recv.len = vstr_recv.len;
bufinfo_recv.buf = vstr_recv.buf;
o_ret = MP_OBJ_NULL;
}
else {
} else {
// recv argument given
mp_get_buffer_raise(args[2], &bufinfo_recv, MP_BUFFER_WRITE);
mp_get_buffer_raise(args[1].u_obj, &bufinfo_recv, MP_BUFFER_WRITE);
if (bufinfo_recv.len != bufinfo_send.len) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, mpexception_value_invalid_arguments));
}
o_ret = args[2];
o_ret = args[1].u_obj;
}
}
// send and receive
pybspi_transfer(self, (const char *)bufinfo_send.buf, vstr_recv.buf, bufinfo_send.len);
pybspi_transfer(self, (const char *)bufinfo_send.buf, bufinfo_recv.buf, bufinfo_send.len);
// return the received data
if (o_ret != MP_OBJ_NULL) {
@ -400,7 +427,7 @@ STATIC mp_obj_t pyb_spi_send_recv (mp_uint_t n_args, const mp_obj_t *args) {
return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr_recv);
}
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_spi_send_recv_obj, 2, 3, pyb_spi_send_recv);
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_spi_send_recv_obj, 1, pyb_spi_send_recv);
STATIC const mp_map_elem_t pyb_spi_locals_dict_table[] = {
// instance methods

2
cc3200/qstrdefsport.h
View File

@ -166,6 +166,7 @@ Q(mode)
Q(baudrate)
Q(addr)
Q(data)
Q(timeout)
Q(memaddr)
Q(addr_size)
Q(init)
@ -348,6 +349,7 @@ Q(deinit)
Q(send)
Q(recv)
Q(send_recv)
Q(timeout)
Q(MASTER)
Q(ACTIVE_LOW)
Q(ACTIVE_HIGH)

162
docs/library/pyb.I2C.rst
View File

@ -45,11 +45,9 @@ To receive inplace, first create a bytearray::
data = bytearray(3) # create a buffer
i2c.recv(data) # receive 3 bytes, writing them into data
.. only:: port_pyboard
You can specify a timeout (in ms)::
You can specify a timeout (in ms)::
i2c.send(b'123', timeout=2000) # timout after 2 seconds
i2c.send(b'123', timeout=2000) # timout after 2 seconds
A master must specify the recipient's address::
@ -57,29 +55,15 @@ A master must specify the recipient's address::
i2c.send('123', 0x42) # send 3 bytes to slave with address 0x42
i2c.send(b'456', addr=0x42) # keyword for address
.. only:: port_pyboard
Master also has other methods::
i2c.is_ready(0x42) # check if slave 0x42 is ready
i2c.scan() # scan for slaves on the bus, returning
# a list of valid addresses
i2c.mem_read(3, 0x42, 2) # read 3 bytes from memory of slave 0x42,
# starting at address 2 in the slave
i2c.mem_write('abc', 0x42, 2, timeout=1000)
.. only:: port_wipy
There are also other methods::
i2c.is_ready(0x42) # check if slave 0x42 is ready
i2c.scan() # scan for slaves on the bus, returning
# a list of valid addresses
i2c.mem_read(3, 0x42, 2) # read 3 bytes from memory of slave 0x42,
# starting at address 2 in the slave
i2c.mem_write('abc', 0x42, 2) # write 'abc' (3 bytes) to memory of slave 0x42
# starting at address 2 in the slave
Master also has other methods::
i2c.is_ready(0x42) # check if slave 0x42 is ready
i2c.scan() # scan for slaves on the bus, returning
# a list of valid addresses
i2c.mem_read(3, 0x42, 2) # read 3 bytes from memory of slave 0x42,
# starting at address 2 in the slave
i2c.mem_write('abc', 0x42, 2, timeout=1000) # write 'abc' (3 bytes) to memory of slave 0x42
# starting at address 2 in the slave, timeout after 1 second
Constructors
------------
@ -102,7 +86,7 @@ Constructors
.. only:: port_wipy
.. class:: pyb.I2C(bus, ...)
Construct an I2C object on the given bus. `bus` can only be 1.
With no additional parameters, the I2C object is created but not
initialised (it has the settings from the last initialisation of
@ -141,118 +125,58 @@ Methods
Check if an I2C device responds to the given address. Only valid when in master mode.
.. only:: port_pyboard
.. method:: i2c.mem_read(data, addr, memaddr, timeout=5000, addr_size=8)
.. method:: i2c.mem_read(data, addr, memaddr, timeout=5000, addr_size=8)
Read from the memory of an I2C device:
- ``data`` can be an integer (number of bytes to read) or a buffer to read into
- ``addr`` is the I2C device address
- ``memaddr`` is the memory location within the I2C device
- ``timeout`` is the timeout in milliseconds to wait for the read
- ``addr_size`` selects width of memaddr: 8 or 16 bits
Read from the memory of an I2C device:
Returns the read data.
This is only valid in master mode.
- ``data`` can be an integer (number of bytes to read) or a buffer to read into
- ``addr`` is the I2C device address
- ``memaddr`` is the memory location within the I2C device
- ``timeout`` is the timeout in milliseconds to wait for the read
- ``addr_size`` selects width of memaddr: 8 or 16 bits
.. only:: port_wipy
Returns the read data.
This is only valid in master mode.
.. method:: i2c.mem_read(data, addr, memaddr, addr_size=8)
Read from the memory of an I2C device:
- ``data`` can be an integer (number of bytes to read) or a buffer to read into
- ``addr`` is the I2C device address
- ``memaddr`` is the memory location within the I2C device
- ``addr_size`` selects width of memaddr: 8 or 16 bits
.. method:: i2c.mem_write(data, addr, memaddr, timeout=5000, addr_size=8)
Returns the read data.
This is only valid in master mode.
Write to the memory of an I2C device:
.. only:: port_pyboard
- ``data`` can be an integer or a buffer to write from
- ``addr`` is the I2C device address
- ``memaddr`` is the memory location within the I2C device
- ``timeout`` is the timeout in milliseconds to wait for the write
- ``addr_size`` selects width of memaddr: 8 or 16 bits
.. method:: i2c.mem_write(data, addr, memaddr, timeout=5000, addr_size=8)
Write to the memory of an I2C device:
- ``data`` can be an integer or a buffer to write from
- ``addr`` is the I2C device address
- ``memaddr`` is the memory location within the I2C device
- ``timeout`` is the timeout in milliseconds to wait for the write
- ``addr_size`` selects width of memaddr: 8 or 16 bits
Returns ``None``.
This is only valid in master mode.
Returns ``None``.
This is only valid in master mode.
.. method:: i2c.recv(recv, addr=0x00, timeout=5000)
.. only:: port_wipy
Receive data on the bus:
.. method:: i2c.mem_write(data, addr, memaddr, timeout=5000, addr_size=8)
Write to the memory of an I2C device:
- ``data`` can be an integer or a buffer to write from
- ``addr`` is the I2C device address
- ``memaddr`` is the memory location within the I2C device
- ``addr_size`` selects width of memaddr: 8 or 16 bits
Returns ``None``.
This is only valid in master mode.
.. only:: port_pyboard
- ``recv`` can be an integer, which is the number of bytes to receive,
or a mutable buffer, which will be filled with received bytes
- ``addr`` is the address to receive from (only required in master mode)
- ``timeout`` is the timeout in milliseconds to wait for the receive
.. method:: i2c.recv(recv, addr=0x00, timeout=5000)
Receive data on the bus:
- ``recv`` can be an integer, which is the number of bytes to receive,
or a mutable buffer, which will be filled with received bytes
- ``addr`` is the address to receive from (only required in master mode)
- ``timeout`` is the timeout in milliseconds to wait for the receive
Return value: if ``recv`` is an integer then a new buffer of the bytes received,
otherwise the same buffer that was passed in to ``recv``.
.. only:: port_wipy
.. method:: i2c.recv(recv, addr=0x00)
Receive data on the bus:
- ``recv`` can be an integer, which is the number of bytes to receive,
or a mutable buffer, which will be filled with received bytes
- ``addr`` is the address to receive from (only required in master mode)
Return value: if ``recv`` is an integer then a new buffer of the bytes received,
otherwise the same buffer that was passed in to ``recv``.
Return value: if ``recv`` is an integer then a new buffer of the bytes received,
otherwise the same buffer that was passed in to ``recv``.
.. method:: i2c.scan()
Scan all I2C addresses from 0x01 to 0x7f and return a list of those that respond.
Only valid when in master mode.
.. only:: port_pyboard
.. method:: i2c.send(send, addr=0x00, timeout=5000)
Send data on the bus:
- ``send`` is the data to send (an integer to send, or a buffer object)
- ``addr`` is the address to send to (only required in master mode)
- ``timeout`` is the timeout in milliseconds to wait for the send
Return value: ``None``.
.. method:: i2c.send(send, addr=0x00, timeout=5000)
.. only:: port_wipy
Send data on the bus:
.. method:: i2c.send(send, addr=0x00)
Send data on the bus:
- ``send`` is the data to send (an integer to send, or a buffer object)
- ``addr`` is the address to send to (only required in master mode)
- ``send`` is the data to send (an integer to send, or a buffer object)
- ``addr`` is the address to send to (only required in master mode)
- ``timeout`` is the timeout in milliseconds to wait for the send
Return value: ``None``.
Return value: ``None``.
Constants
---------

87
docs/library/pyb.SPI.rst
View File

@ -25,7 +25,7 @@ there are 3 lines: SCK, MOSI, MISO.
parameters to init the SPI bus::
from pyb import SPI
spi = SPI(1, SPI.MASTER, baudrate=600000, polarity=1, phase=0)
spi = SPI(1, SPI.MASTER, baudrate=1000000, polarity=0, phase=0, nss=SPI.ACTIVE_LOW)
Only required parameter is mode, must be SPI.MASTER. Polarity can be 0 or
1, and is the level the idle clock line sits at. Phase can be 0 or 1 to
@ -105,7 +105,7 @@ Methods
.. only:: port_wipy
.. method:: spi.init(mode, baudrate=328125, \*, polarity=1, phase=0, bits=8, nss=SPI.ACTIVE_LOW)
.. method:: spi.init(mode, baudrate=1000000, \*, polarity=0, phase=0, bits=8, nss=SPI.ACTIVE_LOW)
Initialise the SPI bus with the given parameters:
@ -122,78 +122,37 @@ Methods
Printing the SPI object will show you the computed baudrate and the chosen
prescaler.
.. only:: port_pyboard
.. method:: spi.recv(recv, \*, timeout=5000)
Receive data on the bus:
- ``recv`` 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 ``recv`` is an integer then a new buffer of the bytes received,
otherwise the same buffer that was passed in to ``recv``.
.. method:: spi.recv(recv, \*, timeout=5000)
.. only:: port_wipy
Receive data on the bus:
.. method:: spi.recv(recv)
Receive data on the bus:
- ``recv`` can be an integer, which is the number of bytes to receive,
or a mutable buffer, which will be filled with received bytes.
Return value: if ``recv`` is an integer then a new buffer of the bytes received,
otherwise the same buffer that was passed in to ``recv``.
- ``recv`` 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.
.. only:: port_pyboard
Return value: if ``recv`` is an integer then a new buffer of the bytes received,
otherwise the same buffer that was passed in to ``recv``.
.. method:: spi.send(send, \*, timeout=5000)
Send data on the bus:
- ``send`` 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: ``None``.
.. method:: spi.send(send, \*, timeout=5000)
.. only:: port_wipy
Send data on the bus:
.. method:: spi.send(send)
Send data on the bus:
- ``send`` is the data to send (an integer to send, or a buffer object).
Return value: ``None``.
- ``send`` is the data to send (an integer to send, or a buffer object).
- ``timeout`` is the timeout in milliseconds to wait for the send.
.. only:: port_pyboard
Return value: ``None``.
.. method:: spi.send_recv(send, recv=None, \*, timeout=5000)
Send and receive data on the bus at the same time:
- ``send`` is the data to send (an integer to send, or a buffer object).
- ``recv`` is a mutable buffer which will be filled with received bytes.
It can be the same as ``send``, or omitted. If omitted, a new buffer will
be created.
- ``timeout`` is the timeout in milliseconds to wait for the receive.
Return value: the buffer with the received bytes.
.. method:: spi.send_recv(send, recv=None, \*, timeout=5000)
.. only:: port_wipy
Send and receive data on the bus at the same time:
.. method:: spi.send_recv(send, recv=None)
Send and receive data on the bus at the same time:
- ``send`` is the data to send (an integer to send, or a buffer object).
- ``recv`` is a mutable buffer which will be filled with received bytes.
It can be the same as ``send``, or omitted. If omitted, a new buffer will
be created.
- ``send`` is the data to send (an integer to send, or a buffer object).
- ``recv`` is a mutable buffer which will be filled with received bytes.
It can be the same as ``send``, or omitted. If omitted, a new buffer will
be created.
- ``timeout`` is the timeout in milliseconds to wait for the receive.
Return value: the buffer with the received bytes.
Return value: the buffer with the received bytes.
Constants
---------
@ -219,4 +178,4 @@ Constants
.. data:: SPI.ACTIVE_LOW
.. data:: SPI.ACTIVE_HIGH
decides the polarity of the NSS pin
selects the polarity of the NSS pin

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