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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,4 +1,4 @@ | ||
| // Quick hardware test. | ||
| // Quick hardware test for SPI card access. | ||
| // | ||
| #include <SPI.h> | ||
| #include "SdFat.h" | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| // Simple performance test for Teensy 3.5/3.6 SDHC. | ||
| // Demonstrates yield() efficiency. | ||
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| #include "SdFat.h" | ||
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| // 32 KiB buffer. | ||
| const size_t BUF_DIM = 32768; | ||
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| // 8 MiB file. | ||
| const uint32_t FILE_SIZE = 256UL*BUF_DIM; | ||
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| SdFatSdio sd; | ||
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| File file; | ||
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| uint8_t buf[BUF_DIM]; | ||
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| // buffer as uint32_t | ||
| uint32_t* buf32 = (uint32_t*)buf; | ||
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| // Total usec in read/write calls. | ||
| uint32_t totalMicros = 0; | ||
| // Time in yield() function. | ||
| uint32_t yieldMicros = 0; | ||
| // Number of yield calls. | ||
| uint32_t yieldCalls = 0; | ||
| // Max busy time for single yield call. | ||
| uint32_t yieldMaxUsec = 0; | ||
| //----------------------------------------------------------------------------- | ||
| // Replace "weak" system yield() function. | ||
| void yield() { | ||
| // Only count cardBusy time. | ||
| if (!sd.card()->dmaBusy()) { | ||
| return; | ||
| } | ||
| uint32_t m = micros(); | ||
| yieldCalls++; | ||
| while (sd.card()->dmaBusy()) { | ||
| // Do something here. | ||
| } | ||
| m = micros() - m; | ||
| if (m > yieldMaxUsec) { | ||
| yieldMaxUsec = m; | ||
| } | ||
| yieldMicros += m; | ||
| } | ||
| //----------------------------------------------------------------------------- | ||
| void setup() { | ||
| Serial.begin(9600); | ||
| while (!Serial) { | ||
| } | ||
| Serial.println("Type any character to begin"); | ||
| while (!Serial.available()) { | ||
| } | ||
| if (!sd.begin()) { | ||
| sd.initErrorHalt(); | ||
| } | ||
| if (!file.open("TeensyDemo.bin", O_RDWR | O_CREAT)) { | ||
| sd.errorHalt("open failed"); | ||
| } | ||
| Serial.println("\nsize,write,read"); | ||
| Serial.println("bytes,KB/sec,KB/sec"); | ||
| for (size_t nb = 512; nb <= BUF_DIM; nb *= 2) { | ||
| file.truncate(0); | ||
| uint32_t nRdWr = FILE_SIZE/nb; | ||
| Serial.print(nb); | ||
| Serial.print(','); | ||
| uint32_t t = micros(); | ||
| for (uint32_t n = 0; n < nRdWr; n++) { | ||
| // Set start and end of buffer. | ||
| buf32[0] = n; | ||
| buf32[nb/4 - 1] = n; | ||
| if (nb != file.write(buf, nb)) { | ||
| sd.errorHalt("write failed"); | ||
| } | ||
| } | ||
| t = micros() - t; | ||
| totalMicros += t; | ||
| Serial.print(1000.0*FILE_SIZE/t); | ||
| Serial.print(','); | ||
| file.rewind(); | ||
| t = micros(); | ||
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| for (uint32_t n = 0; n < nRdWr; n++) { | ||
| if ((int)nb != file.read(buf, nb)) { | ||
| sd.errorHalt("read failed"); | ||
| } | ||
| // crude check of data. | ||
| if (buf32[0] != n || buf32[nb/4 - 1] != n) { | ||
| sd.errorHalt("data check"); | ||
| } | ||
| } | ||
| t = micros() - t; | ||
| totalMicros += t; | ||
| Serial.println(1000.0*FILE_SIZE/t); | ||
| } | ||
| file.close(); | ||
| Serial.print("\ntotalMicros "); | ||
| Serial.println(totalMicros); | ||
| Serial.print("yieldMicros "); | ||
| Serial.println(yieldMicros); | ||
| Serial.print("yieldCalls "); | ||
| Serial.println(yieldCalls); | ||
| Serial.print("yieldMaxUsec "); | ||
| Serial.println(yieldMaxUsec); | ||
| Serial.println("Done"); | ||
| } | ||
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| void loop() { | ||
| } |
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