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LED Driver

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Lee Lup Yuen 2023-12-26 13:28:53 +08:00
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README.md
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@ -4007,11 +4007,21 @@ And here's the [__RTL Code for C906 MMU__](https://github.com/T-head-Semi/openc9
_The "sleep" command always hangs in NuttX Shell. How to fix it?_
That's because we haven't implemented the RISC-V Timer for Ox64! We should call OpenSBI to handle the Timer, here's the fix: https://github.com/lupyuen2/wip-pinephone-nuttx/commit/57ea5f000636f739ac3cb8ea1e60936798f6c3a9#diff-535879ffd6d9fc8e7d84b37a88bdeb1609c4a90e3777150939a96bed18696aee
That's because we haven't implemented the RISC-V Timer for Ox64! We should call OpenSBI to handle the Timer, [here's the fix](https://github.com/lupyuen2/wip-pinephone-nuttx/commit/57ea5f000636f739ac3cb8ea1e60936798f6c3a9#diff-535879ffd6d9fc8e7d84b37a88bdeb1609c4a90e3777150939a96bed18696aee). (Ignore riscv_mtimer.c, we were verifying that mtime and mtimecmp are unused in Kernel Mode)
We only need to change arch/risc-v/src/bl808/bl808_timerisr.c.
We only need to change [arch/risc-v/src/bl808/bl808_timerisr.c](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/nim/arch/risc-v/src/bl808/bl808_timerisr.c#L44-L116)
(Ignore arch/risc-v/src/common/riscv_mtimer.c, we were verifying that mtime and mtimecmp are unused in Kernel Mode)
```c
#define MTIMER_FREQ 1000000
// This function is called during start-up to initialize the timer interrupt.
void up_timer_initialize(void) {
struct oneshot_lowerhalf_s *lower = riscv_mtimer_initialize(
0, 0, RISCV_IRQ_STIMER, MTIMER_FREQ);
DEBUGASSERT(lower);
up_alarm_set_lowerhalf(lower);
}
```
How it works...
@ -4037,6 +4047,8 @@ But this causes the command `sleep 1` to pause for 10 seconds. So we divide the
#define MTIMER_FREQ 1000000
```
Now the `sleep` command works correctly in NuttX Shell!
[Here's the log (ignore the errors)](https://gist.github.com/lupyuen/8aa66e7f88d1e31a5f198958c15e4393)
# LED Driver for Ox64 BL808
@ -4068,28 +4080,35 @@ and then set the level of I/O pin through reg_gpio_xx_o
Thus...
- Set reg_gpio_xx_oe (Bit 6) to 1 to enable the GPIO output mode
- Set reg_gpio_xx_oe (Bit 6) to 1 to enable the GPIO output mode <br>
= (1 << 6)
- Set reg_gpio_xx_func_sel (Bits 8 to 12) to 11 to enter the SWGPIO mode
- Set reg_gpio_xx_func_sel (Bits 8 to 12) to 11 to enter the SWGPIO mode <br>
= (11 << 8)
- Set reg_gpio_xx_mode (Bits 30 to 31) to 0 to enable the normal output function of I/O
- Set reg_gpio_xx_mode (Bits 30 to 31) to 0 to enable the normal output function of I/O <br>
= (0 << 30)
- Set reg_gpio_xx_pu (Bit 4) and reg_gpio_xx_pd (Bit 5) to 0 to disable the internal pull-up and pull-down functions
- Set reg_gpio_xx_pu (Bit 4) and reg_gpio_xx_pd (Bit 5) to 0 to disable the internal pull-up and pull-down functions <br>
= (0 << 4)
- Set the level of I/O pin through reg_gpio_xx_o (Bit 24)
- Set the level of I/O pin through reg_gpio_xx_o (Bit 24) <br>
= Either (0 << 24) Or (1 << 24)
(GPIO Bit Definitions are below)
Which means...
- Set GPIO Output to 0 <br>
= (1 << 6) | (11 << 8) | (0 << 30) | (0 << 4) | (0 << 24) <br>
= 0xb40
- Set GPIO Output to 1 <br>
= (1 << 6) | (11 << 8) | (0 << 30) | (0 << 4) | (1 << 24) <br>
= 0x1000b40
_How to test this?_
GPIO 29 Base Address `gpio_cfg29` is 0x20000938.
For testing, we use U-Boot Bootloader to set GPIO 29 to High and Low...
@ -4114,11 +4133,11 @@ $ md 020000938 1
And U-Boot switches the LED On and Off correctly yay!
_How do we set GPIO 29 in our NuttX LED Driver?_
_How to flip the GPIO in our NuttX LED Driver?_
TODO
_How did we get the GPIO 29 Bit Definitions?_
_How did we get the GPIO Bit Definitions?_
From BL808 Reference Manual Page 119...