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spi.py
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from distutils.command.build import build
from distutils.util import subst_vars
import nhcusb
import sys
import struct
class spi:
GET_VER = 0x01
WRITE_TO_S_BUFF = 0x10
READ_FROM_S_BUFF = 0x11
SPI_INIT = 0x20
SPI_EXIT = 0x21
SPI_WRITE = 0x22
SPI_READ = 0x23
SPI_EXCH = 0x24
SPI_WRITE_N = 0x25
SPI_READ_N = 0x26
SPI_EXCH_N = 0x27
AT89S5X_WRITE = 0x28
AT89S5X_READ = 0x29
usb = nhcusb.nhcusb()
def open(self):
return self.usb.open(0x0416, 0x0002)
def close(self):
self.usb.close()
def get_ver(self):
ver = ""
tmp = bytearray(64)
tmp[0] = self.GET_VER
tmp[1] = 0x00
if self.usb.write(tmp):
(res, tmp) = self.usb.read()
if res:
for i in range(64):
if tmp[i] == 0x00:
break
ver += chr(tmp[i])
return ver
else:
return ver
return ver
def write_to_buff(self, data, pos):
tmp = bytearray(64)
tmp[0] = self.WRITE_TO_S_BUFF
n = len(data)
tmp[1] = n // 64
tmp[2] = pos // 64
if self.usb.write(tmp) == 0:
return 0
return self.usb.write(data, n)
def read_from_buff(self, pos, length):
tmp = bytearray(64)
tmp[0] = self.READ_FROM_S_BUFF
tmp[1] = length // 64
tmp[2] = pos // 64
if self.usb.write(tmp) == 0:
return (0, tmp)
return self.usb.read(length)
def spi_init(self, clock = 1000000, reset = 0):
tmp = bytearray(64)
tmp[0] = self.SPI_INIT
tmp[1:5] = struct.pack('<L', clock)
tmp[5] = reset
if self.usb.write(tmp) == 0:
return 0
(res, tmp) = self.usb.read()
return res
def spi_exit(self, reset = 0):
tmp = bytearray(64)
tmp[0] = self.SPI_EXIT
tmp[1] = reset
if self.usb.write(tmp) == 0:
return 0
(res, tmp) = self.usb.read()
return res
def spi_write(self, data):
tmp = bytearray(64)
tmp[0] = self.SPI_WRITE
n = len(data)
tmp[1] = n
for i in range(n):
tmp[i + 2] = data[i]
if self.usb.write(tmp) == 0:
return 0
(res, tmp) = self.usb.read()
return res
def spi_read(self, length, seed = 0x00):
tmp = bytearray(64)
tmp[0] = self.SPI_READ
tmp[1] = length
tmp[2] = seed
if self.usb.write(tmp) == 0:
return (0, tmp)
return self.usb.read()
def spi_exch(self, data):
tmp = bytearray(64)
tmp[0] = self.SPI_EXCH
n = len(data)
tmp[1] = n
for i in range(n):
tmp[2 + i] = data[i]
if self.usb.write(tmp) == 0:
return (0, tmp)
return self.usb.read()
def spi_write_n(self, data):
if self.write_to_buff(data, 0) == 0:
return 0
n = len(data)
tmp = bytearray(64)
tmp[0] = self.SPI_WRITE_N
tmp[1] = 0
tmp[2] = n // 64
if self.usb.write(tmp) == 0:
return 0
(res, tmp) = self.usb.read()
return res
def spi_read_n(self, length, seed = 0x00):
tmp = bytearray(64)
tmp[0] = self.SPI_READ_N
tmp[1] = 0
tmp[2] = length // 64
tmp[3] = seed
if self.usb.write(tmp) == 0:
return (0, tmp)
return self.read_from_buff(0, length)
def spi_exch_n(self, dataTx):
# first: write data to tx buffer
if self.write_to_buff(dataTx, 0) == 0:
return (0, tmp)
#send cmd write spi_n
tmp = bytearray(64)
tmp[0] = self.SPI_EXCH_N
tmp[1] = 32 # buffer is 64 * 64, rxBuff = 32 * 64
tmp[2] = 0 # buffer is 64 * 64, txBuff = 32 * 64
n = len(dataTx)
tmp[3] = n // 64
if self.usb.write(tmp) == 0:
return (0, tmp)
(res, tmp) = self.usb.read()
if res == 0:
return (0, tmp)
return self.read_from_buff(32 * 64, n)
def at89s5x_write(self, data, address):
if self.write_to_buff(data, 0) == 0:
return 0
tmp = bytearray(64)
tmp[0] = self.AT89S5X_WRITE
tmp[1:5] = struct.pack('<L', address)
tmp[5:9] = struct.pack('<L', len(data))
if self.usb.write(tmp) == 0:
return 0
(res, tmp) = self.usb.read()
if res == 0:
return 0
return tmp[0]
def at89s5x_read(self, address, length):
tmp = bytearray(64)
tmp[0] = self.AT89S5X_READ
tmp[1:5] = struct.pack('<L', address)
tmp[5:9] = struct.pack('<L', length)
if self.usb.write(tmp) == 0:
return (0, tmp)
(res, tmp) = self.usb.read()
if res == 0:
return (0, tmp)
return self.read_from_buff(0, length)