SOIC-8 and SOIC-16 SPI Flash Programming Hat for Raspberry PI
This hat allows the Raspberry PI to program both SOIC-8 and SOIC-16 SPI NOR devices at 1.8 and 3.3 volts. All features of this programmer can be controlled via software.
While the current version of the board has switches and jumpers present, a future version of this board will no longer require them since everything can be controlled by GPIO pins.
SW1: This switch will enable and disable the programmer. When disabled, the power and signals to the sockets will be disabled and SPI NOR chips may be safely installed or removed. Software is able to read this switch and a future software version will be able to override the switch.
SW2: This sets the voltage to use for powering and programming the SPI NOR chips. Software can read the position of this switch and a future version of the software will be able to both read and override the switch setting.
JP1: This jumper should be installed if the board this hat is plugged into does not support SPI chip select 1. For example, the Rock64Pro board does not provide CS1. Software can read whether this jumper is installed or not and can override the jumper. A future version of the software will not need the jumper since it will detect what type of board it is running on.
The SOIC-16 socket will only run in single lane mode. Lanes 1, 2 and 3 are not supported by the Raspberry PI.
LEDs: This board has 6 LEDs.
Power: D6: The white LED in the upper left will be lit when 5V is present. Enabled: D1: This red LED will be lit when power is enabled to the sockets. 3.3V: D2: This LED will be lit when the board is configured for 3.3V 1.8V: D3: This LED will be lit when the board is configured for 1.8V CS0: D4: This LED will light when there is activity with SPI CS0. CS1: D5: This LED will light when there is activity with SPI CS1.
GPIOs used: BMC17: Pin 13: This pin can be input or output. If high, then 3.3 volts is selected, otherwise 1.8v is selected. If not driven, then switch SW2 will control the signal. BCM22: Pin 15: This pin is used to disable power and tri-state the outputs to the sockets. This pin can be read, in which case SW1 will control the signal, or it may be driven to override the switch. BCM5: Pin 29: This pin is used to control whether CS1 is driven by CS0 or not. This pin can be read in which case the state can be controlled by JP1, or it can be driven to override the jumper. This is needed if the board the hat is plugged in to does not support SPI CS1 such as the Rock64Pro board.
SPI pins: BCM10: Pin 19: SPI MOSI signal BCM9: Pin 21: SPI MISO signal BCM11: Pin 23: SPI SCLK BCM8: Pin 24: SPI CS0 BCM7: Pin 26: SPI CS1
I2C Pins: BMCM0: Pin 27: EEPROM I2C SDA BMC1: Pin 28: EEPROM I2C SCL
Power: This board draws power from 5V and 3.3V for internal logic. The sockets power and socket I/O is controlled by a built-in regulator that uses the 5V supply to generate either 1.8 or 3.3V.
All parts can be found at https://digikey.com
=========== Using ==============
Do not install SPI NOR flash devices in both sockets at the same time. A future version of this board may support devices in both sockets.
- Make sure that the board is in the disabled state
- Select the proper voltage for the devices
- Install a SOIC-8 and/or SOIC-16 SPI NOR device into the appropriate socket. Note: If not using a Raspberry PI do not install devices in both sockets.
- Run the software to program the device(s)
- Wait until programming is finished and make sure the enabled LED is not lit. Set the switch to the disabled position.
- Remove the SPI device
Software: TBD Todo: Get the board back and assemble and test it then work on software.