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ch34xSerialDriver: support more baudrates.

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allow to use 57600bps with ch34x based adapter by using dynamic computation of baudrate configuration, based on linux kernel's driver.
This commit is contained in:
Guillaume Revaillot 2016-11-16 13:58:01 +01:00
parent b96f9ca7a2
commit 73b8b73133
1 changed files with 20 additions and 16 deletions
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36
usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/Ch34xSerialDriver.java
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@ -271,30 +271,34 @@ public class Ch34xSerialDriver implements UsbSerialDriver {
private void setBaudRate(int baudRate) throws IOException { private void setBaudRate(int baudRate) throws IOException {
int[] baud = new int[]{2400, 0xd901, 0x0038, 4800, 0x6402, final long CH341_BAUDBASE_FACTOR = 1532620800;
0x001f, 9600, 0xb202, 0x0013, 19200, 0xd902, 0x000d, 38400, final int CH341_BAUDBASE_DIVMAX = 3;
0x6403, 0x000a, 115200, 0xcc03, 0x0008};
for (int i = 0; i < baud.length / 3; i++) { long factor = CH341_BAUDBASE_FACTOR / baudRate;
if (baud[i * 3] == baudRate) { int divisor = CH341_BAUDBASE_DIVMAX;
int ret = controlOut(0x9a, 0x1312, baud[i * 3 + 1]);
if (ret < 0) { while ((factor > 0xfff0) && divisor > 0) {
throw new IOException("Error setting baud rate. #1"); factor >>= 3;
} divisor--;
ret = controlOut(0x9a, 0x0f2c, baud[i * 3 + 2]);
if (ret < 0) {
throw new IOException("Error setting baud rate. #1");
} }
return; if (factor > 0xfff0) {
} throw new IOException("Baudrate " + baudRate + " not supported");
} }
factor = 0x10000 - factor;
throw new IOException("Baud rate " + baudRate + " currently not supported"); int ret = controlOut(0x9a, 0x1312, (int) ((factor & 0xff00) | divisor));
if (ret < 0) {
throw new IOException("Error setting baud rate. #1)");
}
ret = controlOut(0x9a, 0x0f2c, (int) (factor & 0xff));
if (ret < 0) {
throw new IOException("Error setting baud rate. #2");
}
} }
@Override @Override
public void setParameters(int baudRate, int dataBits, int stopBits, int parity) public void setParameters(int baudRate, int dataBits, int stopBits, int parity)
throws IOException { throws IOException {