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tests/serial: update running hints in usage for raspberry pi 3

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This commit is contained in:
Vanya A. Sergeev
2019-08-18 18:05:59 -05:00
parent c635c0ab94
commit ab196c2bb8
1 changed files with 9 additions and 6 deletions
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tests/test_serial.c
+9 -6
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@@ -194,12 +194,15 @@ int main(int argc, char *argv[]) {
fprintf(stderr, "[1/4] Arguments test: No requirements.\n");
fprintf(stderr, "[2/4] Open/close test: Serial port device should be real.\n");
fprintf(stderr, "[3/4] Loopback test: Serial TX and RX should be connected with a wire.\n");
fprintf(stderr, "[4/4] Interactive test: Serial TX should be observed with a logic analyzer.\n\n");
fprintf(stderr, "Hint: for BeagleBone Black, export UART4 to /dev/ttyO4 with:\n");
fprintf(stderr, " echo BB-UART4 > /sys/devices/bone_capemgr.9/slots\n");
fprintf(stderr, "to enable UART4 (TX=P9.13 RX=P9.11).\n");
fprintf(stderr, "Connect a wire between TX and RX, then run this test:\n");
fprintf(stderr, " %s /dev/ttyO4\n\n", argv[0]);
fprintf(stderr, "[4/4] Interactive test: Serial TX should be observed with an oscilloscope or logic analyzer.\n\n");
fprintf(stderr, "Hint: for Raspberry Pi 3, enable UART0 with:\n");
fprintf(stderr, " $ echo \"dtoverlay=pi3-disable-bt\" | sudo tee -a /boot/config.txt\n");
fprintf(stderr, " $ sudo systemctl disable hciuart\n");
fprintf(stderr, " $ sudo reboot\n");
fprintf(stderr, " (Note that this will disable Bluetooth)\n");
fprintf(stderr, "Use pins UART0 TXD (header pin 8) and UART0 RXD (header pin 10),\n");
fprintf(stderr, "connect a loopback between TXD and RXD, and run this test with:\n");
fprintf(stderr, " %s /dev/ttyAMA0\n\n", argv[0]);
exit(1);
}