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failing CRC7 implementation

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soypat
2024-01-14 14:17:04 -03:00
parent 2f85c8bd04
commit 46cd56951c
4 changed files with 198 additions and 76 deletions
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examples/sd/main.go
+11 -7
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@@ -32,7 +32,7 @@ func main() {
if err != nil {
panic(err.Error())
}
sdcard := sd.NewCard(spibus, SPI_CS_PIN.Set)
sdcard := sd.NewSPICard(spibus, SPI_CS_PIN.Set)
err = sdcard.Init()
if err != nil {
@@ -47,20 +47,24 @@ func main() {
data := csd.RawCopy()
crc := sd.CRC7(data[:15])
always1 := data[15]&(1<<7) != 0
println("CSD not valid got", crc, "want", data[15]&^(1<<7), "always1:", always1)
fmt.Printf("ourCRC7=%#b theirCRC7=%#b for data %d\n", crc, csd.CRC7(), data[:15])
println("CSD not valid got", crc, "want", csd.CRC7(), "always1:", always1)
return
} else {
println("CSD valid!")
}
fmt.Printf("name=%s\ncsd=\n%s\n", pname, csd.String())
return
var buf [512]byte
for i := 1; i < 11; i += 1 {
time.Sleep(time.Millisecond)
err = sdcard.ReadBlock(uint32(i), buf[:])
for i := 0; i < 11; i += 1 {
time.Sleep(100 * time.Millisecond)
err = sdcard.ReadBlock(int64(i), buf[:])
if err != nil {
println("err reading block", i, ":", err.Error())
continue
}
fmt.Printf("block %d crc=%#x:\n\t%#x\n", i, sdcard.LastReadCRC(), buf[:])
expectCRC := sd.CRC16(buf[:])
fmt.Printf("block %d theircrc=%#x ourcrc=%#x:\n\t%#x\n", i, sdcard.LastReadCRC(), expectCRC, buf[:])
}
}