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Hang in Enter Critical Section, UART Transmit

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Lee Lup Yuen 2023-07-04 18:39:40 +08:00
parent d276adb21c
commit 93197bc013
1 changed files with 50 additions and 2 deletions
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52
README.md
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@ -1466,7 +1466,7 @@ Hart ID is now 0, which is correct...
Starting kernel ...
clk u5_dw_i2c_clk_core already disabled
clk u5_dw_i2c_clk_apb already disabled
123067DEFGac
123067DEFAGHBCI
```
But `qemu_rv_start` hangs. Why?
@ -1483,7 +1483,55 @@ But `qemu_rv_start` hangs. Why?
TODO: Trace `qemu_rv_start`
TODO: Hangs in `u16550_setup`
# Hang in Enter Critical Section
TODO
From [uart_16550.c](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64/drivers/serial/uart_16550.c#L1713-L1737):
```c
int up_putc(int ch)
{
FAR struct u16550_s *priv = (FAR struct u16550_s *)CONSOLE_DEV.priv;
//// irqstate_t flags;
/* All interrupts must be disabled to prevent re-entrancy and to prevent
* interrupts from firing in the serial driver code.
*/
//// This will hang!
//// flags = enter_critical_section();
/* Check for LF */
if (ch == '\n')
{
/* Add CR */
u16550_putc(priv, '\r');
}
u16550_putc(priv, ch);
//// leave_critical_section(flags);
return ch;
}
```
# Hang in UART Transmit
TODO
From [uart_16550.c](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64/drivers/serial/uart_16550.c#L1638-L1642)
```c
static void u16550_putc(FAR struct u16550_s *priv, int ch)
{
//// This will hang!
//// while ((u16550_serialin(priv, UART_LSR_OFFSET) & UART_LSR_THRE) == 0);
u16550_serialout(priv, UART_THR_OFFSET, (uart_datawidth_t)ch);
}
```
# TODO