Launchpad SPI Explorer
Reusing most of the code from my RPN calculator and combining with my previous Bus Ninja project I now have a tiny subset of the Bus Pirate functionality on the Launchpad.
Serial SPI Explorer =================== A serial port SPI interface for the TI Launchpad. Following the Bus Pirate command syntax. [ assert chip select ] deassert chip selectwrite byte (0x/h prefix for hex 0b/b prefix for binary) r read a byte :n repeat command n times Eg. [ b111:4 0x20 10:2 r:64 ] Assert CS Write 7 7 7 7 Write 32 Write 10 10 Read 64 bytes Deassert CS Example ------- Controlling a Microchip MCP23S17 SPI 16-bit I/O expander:
MCP23S17 | Launchpad ----------|---------- VDD | VCC VSS | GND SO | MISO (P1.7) SI | MOSI (P1.6) CS | CS (P1.4) SCK | SCLK (P1.5) Reset | VCC Wire LEDs to the 8 GPIOA lines. Initialise the chip for non-sequential access: [0x40 0x0A 0x28] # WR_REG(0) IOCONA SEQ_OFF|HAEN Set all of PORTA as outputs: [0x40 0x00 0x00] # WR_REG(0) GPIOADIR ALL_OUTPUT Set a pattern on GPIOA LEDs [0x40 0x12 b10000001] # WR_REG(0) GPIOA GPIOA-0 Serial port ----------- TX on P1.1 RX on P1.2 9600bps 8-N-1 SPI --- Chip Select P1.4 MOSI P1.6 MISO P1.7 SCLK P1.5
And wired up it looks something like this: