Bus Pirate Edu Kit Exercise no.9
From DP
Contents |
Overview
The Circuit
Breadboard legend
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- The (+) and (-) next to PIN1 and PIN2 are intended for devices such as LEDs, where PIN1 should be the anode and connected to a higher potential then PIN2.
Bus Pirate Terminal
HiZ>m<<<the mode command
1. HiZ
2. 1-WIRE
3. UART
4. I2C
5. SPI
6. 2WIRE
7. 3WIRE
8. LCD
x. exit(without change)
(1)>5<<<select the SPI mode<<<
Set speed:
1. 30KHz
2. 125KHz
3. 250KHz
4. 1MHz
(1)>4<<<set the SPI speed to 1 MHz<<<
Clock polarity:
1. Idle low *default
2. Idle high
(1)>1<<<set clock polarity to idle low
Output clock edge:
1. Idle to active
2. Active to idle *default
(2)>2<<<set output clock edge to active to idle
Input sample phase:
1. Middle *default
2. End
(1)>1<<<select the middle input sample phase
CS:
1. CS
2. /CS *default
(2)>2<<<select the inverted CS signal (active low)
Select output type:
1. Open drain (H=Hi-Z, L=GND)
2. Normal (H=3.3V, L=GND)
(1)>2<<<set the output type to normal
Ready
SPI>W<<<turn on the power supplies
POWER SUPPLIES ON
First we need to setup the SPI protocol as per 25LC040A's datasheet. Once the protocol is setup we turn on the power supplies via the 'W' command.
SPI>[0b110]
/CS ENABLED
WRITE: 0x06
/CS DISABLED
SPI>[0b10 0 1 2 3 4 5]
/CS ENABLED
WRITE: 0x02
WRITE: 0x00
WRITE: 0x01
WRITE: 0x02
WRITE: 0x03
WRITE: 0x04
WRITE: 0x05
/CS DISABLED
SPI>[0b11 0 r:5]
/CS ENABLED
WRITE: 0x03
WRITE: 0x00
READ: 0x01 0x02 0x03 0x04 0x05
/CS DISABLED
SPI>m
1. HiZ
2. 1-WIRE
3. UART
4. I2C
5. SPI
6. 2WIRE
7. 3WIRE
8. LCD
x. exit(without change)
(1)>1
Ready
HiZ>
