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itsybitsy-m4: add spi test #6

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Merged
merged 1 commit into from
Apr 9, 2022
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itsybitsy-m4: add spi test #6

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37 changes: 37 additions & 0 deletions itsybitsy-m4/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,8 @@ package main
// ItsyBitsy-M4 G <--> MPU-6050 GND
// ItsyBitsy-M4 D7 <--> MPU-6050 VCC
//
// SPI tests:
// ItsyBitsy-M4 MOSI <--> ItsyBitsy-M4 MISO
import (
"machine"
"strconv"
Expand Down Expand Up @@ -64,6 +66,7 @@ func main() {
analogReadGround()
analogReadHalfVoltage()
i2cConnection()
spiTxRx()

endTests()
}
Expand Down Expand Up @@ -277,6 +280,40 @@ func i2cConnection() {
printtestresult("pass")
}

// checks if it is possible to send/receive by spi
func spiTxRx() {
spi0 := machine.SPI0
spi0.Configure(machine.SPIConfig{
SCK: machine.SPI0_SCK_PIN,
SDO: machine.SPI0_SDO_PIN,
SDI: machine.SPI0_SDI_PIN,
Frequency: 4000000,
})

from := make([]byte, 8)
for i := range from {
from[i] = byte(i)
}
to := make([]byte, len(from))

printtest("spiTx")
err := spi0.Tx(from, to)
if err != nil {
printtestresult("fail")
} else {
printtestresult("pass")
}

printtest("spiRx")
for i := range from {
if from[i] != to[i] {
printtestresult("fail")
return
}
}
printtestresult("pass")
}

func printtest(testname string) {
print("- " + testname + " = ")
}
Expand Down