1'''
2SPI - SPI_read_and_write.py with synchronous mode.
3
4This example demonstrates how to communicate with USBDAQF1CD (master) and 25LC640 (slave) with SPI interface.
5
6First, it shows how to open SPI port & DIO pins and configure SPI parameters.
7Second, write some bytes with address into EEPROM (25LC640). We have to make sure that bytes written in address is correct however read address from EEPROM (25LC640).
8Last, close SPI port & DIO pins.
9
10-------------------------------------------------------------------------------------
11Please change correct serial number or IP and port number BEFORE you run example code.
12
13For other examples please check:
14 https://github.com/WPC-Systems-Ltd/WPC_Python_driver_release/tree/main/examples
15See README.md file to get detailed usage of this example.
16
17Copyright (c) 2022-2024 WPC Systems Ltd. All rights reserved.
18'''
19
20## Python
21import time
22
23## WPC
24
25from wpcsys import pywpc
26
27def main():
28 ## Get Python driver version
29 print(f'{pywpc.PKG_FULL_NAME} - Version {pywpc.__version__}')
30
31 ## Create device handle
32 dev = pywpc.USBDAQF1CD()
33
34 ## Connect to device
35 try:
36 dev.connect("default") ## Depend on your device
37 except Exception as err:
38 pywpc.printGenericError(err)
39 ## Release device handle
40 dev.close()
41 return
42
43 try:
44 ## Parameters setting
45 port = 2 ## Depend on your device
46 datasize = 0 ## Mode: 0 = 8-bit data, 1 = 16-bit data.
47 first_bit = 0 ## Mode: 0 = MSB first, 1 = LSB first.
48 prescaler = 64
49 mode = 0 ## 0 : CPOL = 0 CPHA = 0 ## 1 : CPOL = 0 CPHA = 1
50 ## 2 : CPOL = 1 CPHA = 0 ## 3 : CPOL = 1 CPHA = 1
51
52 if port == 1:
53 DO_port = 2
54 DO_index = [0] ## CS pin
55
56 elif port == 2:
57 DO_port = 3
58 DO_index = [2] ## CS pin
59
60 timeout = 3 ## second
61
62 ## Generate random data
63 import numpy as np
64 addr = np.random.randint(8) ## Generate a random address
65 value = np.random.randint(256) ## Generate a random value
66
67 WRITE = 0x02
68 DUMMY = 0x01
69 READ = 0x03
70 WREN = 0x06
71
72 '''
73 Take 25LC640 for example
74 '''
75
76 ## Get firmware model & version
77 driver_info = dev.Sys_getDriverInfo(timeout)
78 print("Model name: " + driver_info[0])
79 print("Firmware version: " + driver_info[-1])
80
81 '''
82 Open DO pins & SPI port & set CS(pin0) to high
83 '''
84
85 ## Open pin0 with digital output
86 err = dev.DO_openPins(DO_port, DO_index, timeout)
87 print(f"DO_openPins in port {DO_port}, status: {err}")
88
89 ## Open SPI
90 err = dev.SPI_open(port)
91 print(f"SPI_open in port {port}, status: {err}")
92
93 ## Set CS(pin0) to high
94 err = dev.DO_writePins(DO_port, DO_index, [1], timeout)
95 print(f"DO_writePins in port {DO_port}, status: {err}")
96
97 '''
98 Set SPI parameter
99 '''
100
101 ## Set SPI port and set datasize to 8-bits data
102 err = dev.SPI_setDataSize(port, datasize, timeout)
103 print(f"SPI_setDataSize in port {port}, status: {err}")
104
105 ## Set SPI port and set first_bit to MSB first
106 err = dev.SPI_setFirstBit(port, first_bit, timeout)
107 print(f"SPI_setFirstBit in port {port}, status: {err}")
108
109 ## Set SPI port and set prescaler to 64
110 err = dev.SPI_setPrescaler(port, prescaler, timeout)
111 print(f"SPI_setPrescaler in port {port}, status: {err}")
112
113 ## Set SPI port and set CPOL and CPHA to 0 (mode 0)
114 err = dev.SPI_setMode(port, mode, timeout)
115 print(f"SPI_setMode in port {port}, status: {err}")
116
117 '''
118 Write data via SPI
119 '''
120
121 ## Set CS(pin0) to low
122 err = dev.DO_writePins(DO_port, DO_index, [0], timeout)
123 print(f"DO_writePins in port {DO_port}, status: {err}")
124 time.sleep(0.01) ## delay [s]
125
126 ## Write WREN byte
127 err = dev.SPI_write(port, [WREN], timeout)
128 print(f"SPI_write in port {port}, status: {err}")
129 time.sleep(0.01) ## delay [s]
130
131 ## Set CS(pin0) to high
132 err = dev.DO_writePins(DO_port, DO_index, [1], timeout)
133 print(f"DO_writePins in port {DO_port}, status: {err}")
134 time.sleep(0.05) ## delay [s]
135
136 '''
137 Write data via SPI
138 '''
139
140 ## Set CS(pin0) to low
141 err = dev.DO_writePins(DO_port, DO_index, [0], timeout)
142 print(f"DO_writePins in port {DO_port}, status: {err}")
143 time.sleep(0.01) ## delay [s]
144
145 ## Write the generated byte into the generated address
146 err = dev.SPI_write(port, [WRITE, 0x00, addr, value], timeout)
147 print(f"SPI_write in port {port}, status: {err}")
148 print(f"Write data: 0x{value:02X}")
149 time.sleep(0.01) ## delay [s]
150
151 ## Set CS(pin0) to high
152 err = dev.DO_writePins(DO_port, DO_index, [1], timeout)
153 print(f"DO_writePins in port {DO_port}, status: {err}")
154 time.sleep(0.05) ## delay [s]
155
156 '''
157 Read data via SPI
158 '''
159
160 ## Set CS(pin0) to low
161 err = dev.DO_writePins(DO_port, DO_index, [0], timeout)
162 print(f"DO_writePins in port {DO_port}, status: {err}")
163 time.sleep(0.01) ## delay [s]
164
165 ## Read the written byte from the generated address
166 data = dev.SPI_readAndWrite(port, [READ, 0x00, addr, DUMMY], timeout)
167 data = ['{:02x}'.format(value) for value in data]
168 print("read data :", data)
169 time.sleep(0.01) ## delay [s]
170
171 ## Set CS(pin0) to high
172 err = dev.DO_writePins(DO_port, DO_index, [1], timeout)
173 print(f"DO_writePins in port {DO_port}, status: {err}")
174
175 '''
176 Close DO pins and SPI port
177 '''
178
179 ## Close SPI
180 err = dev.SPI_close(port, timeout)
181 print(f"SPI_close in port {port}, status: {err}")
182
183 ## Close pin0 with digital output
184 err = dev.DO_closePins(DO_port, DO_index, timeout)
185 print(f"DO_closePins in port {DO_port}, status: {err}")
186 except Exception as err:
187 pywpc.printGenericError(err)
188
189 ## Disconnect device
190 dev.disconnect()
191
192 ## Release device handle
193 dev.close()
194
195 return
196
197if __name__ == '__main__':
198 main()