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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/common.js"></script>
<script src="resources/manual.js"></script>
</head>
<body>
<p>
These tests require a device configured with the following Arduino sketch:
<pre>
uint32_t seed = 0;
uint32_t bytesToSend = 0;
uint8_t nextByte() {
seed = (1103515245 * seed + 12345) % 0x8000000;
return (seed >> 16) & 0xFF;
}
void setup() {
Serial.begin(115200);
}
void loop() {
if (!Serial) {
return;
}
if (bytesToSend == 0) {
// Read the seed and number of bytes to send from the host as 32-bit
// little-endian values.
if (Serial.available() < 8) {
return;
}
uint8_t buf[8];
Serial.readBytes((char*)buf, sizeof buf);
seed = (uint32_t)buf[0] |
((uint32_t)buf[1] << 8) |
((uint32_t)buf[2] << 16) |
((uint32_t)buf[3] << 24);
bytesToSend = (uint32_t)buf[4] |
((uint32_t)buf[5] << 8) |
((uint32_t)buf[6] << 16) |
((uint32_t)buf[7] << 24);
} else {
uint8_t buf[64];
uint32_t count = min(sizeof buf, bytesToSend);
for (uint32_t i = 0; i < count; ++i) {
buf[i] = nextByte();
}
bytesToSend -= count;
Serial.write((char*)buf, count);
}
}
</pre>
</p>
<p>
<progress id='progress'></progress>
</p>
<script>
let seed = 10;
const length = 1024 * 1024 * 10;
function next_byte() {
seed = (Math.imul(1103515245, seed) + 12345) % (1 << 31);
return (seed >> 16) & 0xFF;
}
manual_serial_test(async (t, port) => {
await port.open({baudRate: 115200, bufferSize: 1024});
const config = new DataView(new ArrayBuffer(8));
config.setUint32(0, seed, /*littleEndian=*/true);
config.setUint32(4, length, /*littleEndian=*/true);
const writer = port.writable.getWriter();
writer.write(config);
const progress = document.getElementById('progress');
progress.max = length;
progress.value = 0;
const reader = port.readable.getReader();
let bytesRead = 0;
while (bytesRead < length) {
const { value, done } = await reader.read();
assert_false(done);
for (let i = 0; i < value.byteLength; ++i) {
assert_equals(value[i], next_byte(),
`mismatch at byte ${bytesRead + i}`);
}
bytesRead += value.byteLength;
progress.value = bytesRead;
}
writer.releaseLock();
reader.releaseLock();
await port.close();
}, `Reading ${length} bytes from the device succeeds.`);
</script>
</body>
</html>
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