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UART3 returns a stream of garbage
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1 changed files with 49 additions and 67 deletions
106
README.md
106
README.md
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@ -1097,21 +1097,25 @@ FYI: How `printf` works...
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To support multiple UART Ports, we copied the following functions from the [Allwinner A1X UART Driver](https://github.com/apache/nuttx/blob/master/arch/arm/src/a1x/a1x_serial.c#L695-L987)...
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- [`up_setup`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/d863c319dd449b6e0c66b3ea4e04d60aa7264105/arch/arm64/src/a64/a64_serial.c#L408-L516)
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- [`up_setup`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/83566af2e58f92ae42fd434ce97f919404245986/arch/arm64/src/a64/a64_serial.c#L406-L537)
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- [`a64_uart_irq_handler`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/d863c319dd449b6e0c66b3ea4e04d60aa7264105/arch/arm64/src/a64/a64_serial.c#L296-L406)
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- [`a64_uart_irq_handler`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/83566af2e58f92ae42fd434ce97f919404245986/arch/arm64/src/a64/a64_serial.c#L294-L404)
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We modified [`a64_uart_setup`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/d863c319dd449b6e0c66b3ea4e04d60aa7264105/arch/arm64/src/a64/a64_serial.c#L518-L539) to call [`up_setup`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/d863c319dd449b6e0c66b3ea4e04d60aa7264105/arch/arm64/src/a64/a64_serial.c#L408-L516).
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We modified [`a64_uart_setup`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/83566af2e58f92ae42fd434ce97f919404245986/arch/arm64/src/a64/a64_serial.c#L539-L560) to call [`up_setup`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/83566af2e58f92ae42fd434ce97f919404245986/arch/arm64/src/a64/a64_serial.c#L406-L537).
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We register UART3 as `/dev/ttyS1` in [`arm64_serialinit`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/d863c319dd449b6e0c66b3ea4e04d60aa7264105/arch/arm64/src/a64/a64_serial.c#L1129-L1196).
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We register UART3 as `/dev/ttyS1` in [`arm64_serialinit`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/83566af2e58f92ae42fd434ce97f919404245986/arch/arm64/src/a64/a64_serial.c#L1150-L1217).
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[(Here's the log)](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/d863c319dd449b6e0c66b3ea4e04d60aa7264105/arch/arm64/src/a64/a64_serial.c#L1239-L1450)
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[(Here's the log)](https://github.com/lupyuen2/wip-pinephone-nuttx-apps/blob/7e9706c3dccc26dd33ddf71fd0ea64f9a17de4a1/examples/hello/hello_main.c#L76-L340)
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This will be used for testing the PinePhone LTE Modem on UART3...
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Be careful when logging to the UART Port! If the UART Port is busy, we won't be able to set the Baud Rate...
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> "This register may only be accessed when the DLAB bit (UART_LCR[7]) is set and the UART is not busy (UART_USR[0] is zero)"
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Let's test the PinePhone LTE Modem on UART3...
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## Test UART3 Port
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This is how we read and write the UART3 port via `/dev/ttyS1`: [hello_main.c](https://github.com/lupyuen2/wip-pinephone-nuttx-apps/blob/9b88915d00a1e8f712d9a09269a8fb593a9a518b/examples/hello/hello_main.c#L42-L68)
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This is how we read and write the UART3 port via `/dev/ttyS1`: [hello_main.c](https://github.com/lupyuen2/wip-pinephone-nuttx-apps/blob/7e9706c3dccc26dd33ddf71fd0ea64f9a17de4a1/examples/hello/hello_main.c#L42-L69)
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```c
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// Open /dev/ttyS1 (UART3)
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@ -1119,6 +1123,9 @@ This is how we read and write the UART3 port via `/dev/ttyS1`: [hello_main.c](ht
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printf("Open /dev/ttyS1: fd=%d\n", fd);
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assert(fd > 0);
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// Forever write and read
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for (;;)
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{
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// Write command
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const char cmd[] = "AT\nAT\nAT\r\nAT\r\n";
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ssize_t nbytes = write(fd, cmd, sizeof(cmd));
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@ -1126,13 +1133,10 @@ This is how we read and write the UART3 port via `/dev/ttyS1`: [hello_main.c](ht
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assert(nbytes == sizeof(cmd));
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// Read response
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for (;;)
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{
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static char buf[1024];
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nbytes = read(fd, buf, sizeof(buf) - 1);
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if (nbytes >= 0) { buf[nbytes] = 0; }
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printf("Response: nbytes=%ld, buf=%s\n", nbytes, buf);
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for (int i = 0; i < nbytes; i++)
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{
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char c = buf[i];
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@ -1147,71 +1151,49 @@ This is how we read and write the UART3 port via `/dev/ttyS1`: [hello_main.c](ht
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But the output from UART3 doesn't look meaningful...
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```text
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NuttShell (NSH) NuttX-12.0.3
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nsh> hello
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up_setup: baud_rate=115200
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up_setup: Clear fifos
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up_serialout: addr=0x1c28c08, before=0x1, after=0x6
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up_setup: Set trigger
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up_serialout: addr=0x1c28c08, before=0x1, after=0x81
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up_setup: Set up the IER
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up_setup: Enter DLAB=1
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up_serialout: addr=0x1c28c0c, before=0x0, after=0x83
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up_setup: Set the BAUD divisor
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up_serialout: addr=0x1c28c04, before=0x0, after=0x0
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up_serialout: addr=0x1c28c00, before=0x0, after=0xd
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up_setup: Clear DLAB
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up_serialout: addr=0x1c28c0c, before=0x83, after=0x3
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up_setup: addr=0x1c28c04, before=0x0, after=0x0
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up_setup: addr=0x1c28c00, before=0x0, after=0xd
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up_setup: Configure the FIFOs
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up_serialout: addr=0x1c28c08, before=0xc1, after=0x87
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Hello, World!!
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Open /dev/ttyS1: fd=3
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Write command: nbytes=15
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Response: nbytes=4, buf=”.
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[d3] ”
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[10] .
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[00] .
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[00] .
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Response: nbytes=4, buf=:.
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[3a] :
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[02] .
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[00] .
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[00] .
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Response: nbytes=5, buf=fl´.
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[df] fl
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[ab] ´
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[04] .
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[00] .
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[00] .
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Response: nbytes=7, buf=<3D>~I
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[db] <20>
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[7e] ~
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[49] I
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[08]
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[00]
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[00]
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[00]
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Write command: nbytes=15
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Response: nbytes=8, buf=<3D>W
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[eb] <20>
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[57] W
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[05]
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[05]
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[00]
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[00]
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[00]
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[00]
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Write command: nbytes=15
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Response: nbytes=6, buf=[<5B>
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[5b] [
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[ae] <20>
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[20]
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[00]
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[00]
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[00]
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```
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[(Output Log)](https://github.com/lupyuen2/wip-pinephone-nuttx-apps/blob/9b88915d00a1e8f712d9a09269a8fb593a9a518b/examples/hello/hello_main.c#L217-L664)
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[(Output Log)](https://github.com/lupyuen2/wip-pinephone-nuttx-apps/blob/7e9706c3dccc26dd33ddf71fd0ea64f9a17de4a1/examples/hello/hello_main.c#L205-L338)
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TODO: Check the Allwinner A64 UART Register Addresses
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TODO: Why the spurious UART interrupts?
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TODO: Why is DLAB Before Value different for UART0 vs UART3?
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```text
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// UART0:
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up_serialout: addr=0x1c2800c, before=0x3, after=0x3
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// UART3:
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up_serialout: addr=0x1c28c0c, before=0x83, after=0x3
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```
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TODO: Why is BAUD Divisor originally 0 for UART0?
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```text
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up_setup: Set the BAUD divisor
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up_serialout: addr=0x1c28004, before=0x0, after=0x0
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up_serialout: addr=0x1c28000, before=0x0, after=0xd
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```
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Maybe because UART is busy?
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> "This register may only be accessed when the DLAB bit (UART_LCR[7]) is set and the UART is not busy (UART_USR[0] is zero)"
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# Boot NuttX on PinePhone
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Read the article...
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