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Merged
ckormanyos merged 2 commits into from
Mar 15, 2025
Merged

LED dimming show RISC-V-ULP processor #628

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7440b51
LED dimming show RISC-V-ULP processor
ckormanyos Mar 15, 2025
3cd8182
Trivial syntax cleanup
ckormanyos Mar 15, 2025
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10 changes: 6 additions & 4 deletions readme.md
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Expand Up @@ -403,15 +403,17 @@ features a bare-metal startup _without_ using any of the SDK.
The bare-metal startup was taken from the work of
[Chalandi/Baremetal_esp32s3_nosdk](https://github.com/Chalandi/Baremetal_esp32s3_nosdk).
The multicore system first boots core0 which subsequently
starts up core1 and also starts up the RISCV coprocessor core.
starts up core1 and also starts up the RISC-V-ULP coprocessor core.
Blinky runs in the standard `ref_app`
on core0 toggling `port7` while an endless timer loop on core1
toggles `port6`. These LED ports togle in near unison
at the normal blinky feequency of $\frac{1}{2}~\text{Hz}$.
The RISCV coprocessor toggles `port17` at a randomly chosen
frequency slightly higher than that of the regular blinky show.
The RISC-V-ULP coprocessor performs an LED dimming
show on `port17` at a randomly chosen frequency
that is asynchronous to the regular blinky show.
Self-procured LEDs and resistors need to be fitted externally
on the port pins in order to observe blinking on this particular board.
on the port pins in order to observe blinking and dimming
on this particular board.

The NXP(R) OM13093 LPC11C24 board ARM(R) Cortex(R)-M0+ configuration
called `target lpc11c24` toggles the LED on `port0.8`.
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1 change: 0 additions & 1 deletion ref_app/src/mcal/xtensa_esp32_s3_riscv_cop/mcal_port.h
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Expand Up @@ -30,7 +30,6 @@
static auto set_direction_output() -> void
{
mcal::reg::reg_access_static<std::uint32_t, std::uint32_t, io_rtc_padxx_reg, UINT32_C(19)>::bit_set();
mcal::reg::reg_access_static<std::uint32_t, std::uint32_t, gpio_pinxx_reg, UINT32_C(0)>::reg_set();

// Set the pin to output low.
mcal::reg::reg_access_static<std::uint32_t, std::uint32_t, mcal::reg::gpio::rtc_gpio_out_reg, std::uint32_t { UINT32_C(10) + bpos }>::bit_clr();
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174 changes: 89 additions & 85 deletions ref_app/target/micros/xtensa_esp32_s3/startup/coprocessor_binary.S
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3 changes: 0 additions & 3 deletions ref_app/target/micros/xtensa_esp32_s3_riscv_cop/make/xtensa_esp32_s3_riscv_cop.ld
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Expand Up @@ -60,9 +60,6 @@ SECTIONS
. = ALIGN(4);
*(.rodata*)
. = ALIGN(4);
PROVIDE(__INTVECT_BASE_ADDRESS = .);
*(.intvect_core*)
. = ALIGN(4);
} > D_SRAM

/* Section for constructors */
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38 changes: 30 additions & 8 deletions ref_app/target/micros/xtensa_esp32_s3_riscv_cop/startup/from_no_sdk/Code/Appli/main.cpp
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Expand Up @@ -27,7 +27,7 @@
#include <mcal_led.h>
#include <mcal_port.h>

extern "C" void main();
extern "C" auto main() -> int;

namespace mcal
{
Expand All @@ -44,25 +44,47 @@ namespace
{
volatile std::uint32_t main_counter { };

auto delay() -> void
auto delay(const std::uint32_t loop_count) -> void
{
constexpr std::uint32_t loop_count{ UINT32_C(0x00060000) };

for (std::uint32_t loop{ UINT32_C(0) }; loop < loop_count; ++loop)
for (std::uint32_t loop { UINT32_C(0) }; loop < loop_count; ++loop)
{
main_counter = std::uint32_t { main_counter + UINT8_C(1) };
}
}
}

extern "C" void main()
extern "C" auto main() -> int
{
mcal::init();

unsigned prescaler { UINT8_C(0) };
unsigned cycle { UINT8_C(0) };

for(;;)
{
mcal::led::led0().toggle();
switch(unsigned { cycle % unsigned { UINT8_C(16) } })
{
case unsigned { UINT8_C( 0) }: mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C(60) }); mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C( 4) }); break;
case unsigned { UINT8_C( 1) }: mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C(32) }); mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C(32) }); break;
case unsigned { UINT8_C( 2) }: mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C( 8) }); mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C(56) }); break;
case unsigned { UINT8_C( 3) }: mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C( 6) }); mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C(58) }); break;
case unsigned { UINT8_C( 4) }: mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C( 4) }); mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C(60) }); break;
case unsigned { UINT8_C( 5) }: mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C( 3) }); mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C(61) }); break;
case unsigned { UINT8_C( 6) }: mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C( 2) }); mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C(62) }); break;
case unsigned { UINT8_C( 7) }: mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C( 1) }); mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C(63) }); break;
case unsigned { UINT8_C( 8) }: mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C( 1) }); mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C(60) }); break;
case unsigned { UINT8_C( 9) }: mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C( 2) }); mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C(32) }); break;
case unsigned { UINT8_C(10) }: mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C( 3) }); mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C( 8) }); break;
case unsigned { UINT8_C(11) }: mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C( 4) }); mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C( 6) }); break;
case unsigned { UINT8_C(12) }: mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C( 6) }); mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C( 4) }); break;
case unsigned { UINT8_C(13) }: mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C( 8) }); mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C( 3) }); break;
case unsigned { UINT8_C(14) }: mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C(32) }); mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C( 2) }); break;
case unsigned { UINT8_C(15) }: mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C(60) }); mcal::led::led0().toggle(); delay(std::uint32_t { UINT8_C( 1) }); break;
}

delay();
if(unsigned { ++prescaler % unsigned { UINT8_C(1024) } } == unsigned { UINT8_C(0) })
{
++cycle;
}
}
}
36 changes: 20 additions & 16 deletions ...p/target/micros/xtensa_esp32_s3_riscv_cop/startup/from_no_sdk/Code/Startup/IntVectTable.S
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Expand Up @@ -8,35 +8,39 @@
// Originally from:
/******************************************************************************************
Filename : IntVectTable.S

Core : RISC-V

MCU : ESP32-S3

Author : Chalandi Amine

Owner : Chalandi Amine

Date : 22.02.2025

Description : interrupt vector table implementation for ULP-RISC-V Co-processor

******************************************************************************************/

/*******************************************************************************************
\brief
\param
\return
\brief

\param

\return
********************************************************************************************/
.section .vector
.type _InterruptVectorTable, @function
.align 4
.extern _IRQ_VECTORS
.globl _InterruptVectorTable

_InterruptVectorTable:
/* reset vector */
j _start

/* reset vector */
.org _InterruptVectorTable + 0x00
j _start

.org _InterruptVectorTable + 0x0C
AlignmentDummy:
nop // 2-byte op
nop // 2-byte op
14 changes: 7 additions & 7 deletions ref_app/target/micros/xtensa_esp32_s3_riscv_cop/startup/from_no_sdk/Code/Startup/boot.S
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Expand Up @@ -24,24 +24,24 @@
******************************************************************************************/

/*******************************************************************************************
\brief
\param
\return
\brief

\param

\return
********************************************************************************************/
.section .boot
.type _start, @function
.align 4
.extern __STACK_TOP
.extern Startup_Init
.extern __my_startup
.globl _start

_start:
/* setup the stack pointer */
la sp, __STACK_TOP

/* setup C/C++ runtime environment */
j Startup_Init
j __my_startup

.size _start, .-_start
4 changes: 2 additions & 2 deletions ref_app/target/micros/xtensa_esp32_s3_riscv_cop/startup/from_no_sdk/Code/Startup/crt0.cpp
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Expand Up @@ -19,10 +19,10 @@ extern "C"
{
extern auto main() -> int;

void Startup_Init() __attribute__((used, noinline));
void __my_startup() __attribute__((used, noinline));
}

void Startup_Init()
void __my_startup()
{
// Initialize statics from ROM to RAM.
// Zero-clear default-initialized static RAM.
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