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Add logic tree for conditional voltage setting based on freq request #37

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f3410fb
Add logic tree for conditional voltage setting based on freq request
Json-To-String Aug 25, 2025
b1173ad
Remove stray remaining overclock firmware definitions
Json-To-String Aug 27, 2025
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101 changes: 52 additions & 49 deletions prawnblaster/CMakeLists.txt
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Original file line number Diff line number Diff line change
@@ -1,49 +1,52 @@
set(overclocks 0;1)

foreach (overclock IN LISTS overclocks)
# Compute firmware name
set(firmware_name prawnblaster)
if(PICO_PLATFORM MATCHES "^rp2350")
set(firmware_name "${firmware_name}_rp2350")
else()
set(firmware_name "${firmware_name}_${PICO_PLATFORM}")
endif()
if(overclock)
set(firmware_name "${firmware_name}_overclock")
endif()

add_executable(${firmware_name} prawnblaster.cpp fast_serial.c)

pico_generate_pio_header(${firmware_name} ${CMAKE_CURRENT_LIST_DIR}/pseudoclock.pio)

# Pass in number of instructions to firmware as a compiler definition
set(num_instructions 30000)
if(PICO_PLATFORM MATCHES "^rp2350")
set(num_instructions 60000)
endif()
target_compile_definitions(${firmware_name} PUBLIC "PRAWNBLASTER_NUM_INSTRUCTIONS=${num_instructions}")

# Pass in board type to firmware as a compiler definition. Note that PICO_BOARD is passed in by the SDK, but it's passed in a string which isn't valid and so I can't use it...
# This is also, to some extent, a duplicate of the above PRAWNBLASTER_NUM_INSTRUCTIONS but I think it makes sense to keep these seperate.
if (PICO_BOARD STREQUAL "pico")
target_compile_definitions(${firmware_name} PUBLIC "PRAWNBLASTER_PICO_BOARD=1")
elseif (PICO_BOARD STREQUAL "pico2")
target_compile_definitions(${firmware_name} PUBLIC "PRAWNBLASTER_PICO_BOARD=2")
else ()
message(FATAL_ERROR "Unsupported PICO_BOARD")
endif()


# Pass in overclock state to firmware as a compiler definition
if(overclock)
target_compile_definitions(${firmware_name} PUBLIC "PRAWNBLASTER_OVERCLOCK=1")
endif()

# Pull in our pico_stdlib which aggregates commonly used features
target_link_libraries(${firmware_name} pico_stdlib hardware_pio pico_multicore pico_unique_id hardware_clocks hardware_dma hardware_vreg tinyusb_device tinyusb_board)
target_include_directories(${firmware_name} PRIVATE .)

# create map/bin/hex/uf2 file etc.
pico_add_extra_outputs(${firmware_name})

endforeach()
# Compute firmware name
set(firmware_name prawnblaster)
if(PICO_PLATFORM MATCHES "^rp2350")
set(firmware_name "${firmware_name}_rp2350")
else()
set(firmware_name "${firmware_name}_${PICO_PLATFORM}")
endif()
# if(overclock)
# set(firmware_name "${firmware_name}_overclock")
# endif()

add_executable(${firmware_name} prawnblaster.cpp fast_serial.c)

pico_generate_pio_header(${firmware_name} ${CMAKE_CURRENT_LIST_DIR}/pseudoclock.pio)

# Pass in number of instructions to firmware as a compiler definition
set(num_instructions 30000)

# Pass in freq limits to firmware in MHz
set(normal_freq_limit 133)
set(overclock_freq_limit 200)

if(PICO_PLATFORM MATCHES "^rp2350")
set(num_instructions 60000)
set(normal_freq_limit 150)
endif()
target_compile_definitions(${firmware_name} PUBLIC "PRAWNBLASTER_NUM_INSTRUCTIONS=${num_instructions}")
target_compile_definitions(${firmware_name} PUBLIC "PRAWNBLASTER_NORMAL_FREQ_LIMIT=${normal_freq_limit}")
target_compile_definitions(${firmware_name} PUBLIC "PRAWNBLASTER_OVERCLOCK_FREQ_LIMIT=${overclock_freq_limit}")

# Pass in board type to firmware as a compiler definition. Note that PICO_BOARD is passed in by the SDK, but it's passed in a string which isn't valid and so I can't use it...
# This is also, to some extent, a duplicate of the above PRAWNBLASTER_NUM_INSTRUCTIONS but I think it makes sense to keep these seperate.
if (PICO_BOARD STREQUAL "pico")
target_compile_definitions(${firmware_name} PUBLIC "PRAWNBLASTER_PICO_BOARD=1")
elseif (PICO_BOARD STREQUAL "pico2")
target_compile_definitions(${firmware_name} PUBLIC "PRAWNBLASTER_PICO_BOARD=2")
else ()
message(FATAL_ERROR "Unsupported PICO_BOARD")
endif()


# Pass in overclock state to firmware as a compiler definition
if(overclock)
target_compile_definitions(${firmware_name} PUBLIC "PRAWNBLASTER_OVERCLOCK=1")
endif()

# Pull in our pico_stdlib which aggregates commonly used features
target_link_libraries(${firmware_name} pico_stdlib hardware_pio pico_multicore pico_unique_id hardware_clocks hardware_dma hardware_vreg tinyusb_device tinyusb_board)
target_include_directories(${firmware_name} PRIVATE .)

# create map/bin/hex/uf2 file etc.
pico_add_extra_outputs(${firmware_name})
35 changes: 14 additions & 21 deletions prawnblaster/prawnblaster.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,10 @@ const char VERSION[16] = "1.2.0-overclock";

int DEBUG;

// Freq limits in MHz
constexpr unsigned int normal_freq_limit = PRAWNBLASTER_NORMAL_FREQ_LIMIT;
constexpr unsigned int overclock_freq_limit = PRAWNBLASTER_OVERCLOCK_FREQ_LIMIT;

// Can't seem to have this be used to define array size even though it's a constant
constexpr unsigned int max_instructions = PRAWNBLASTER_NUM_INSTRUCTIONS;
constexpr unsigned int instruction_array_size = 2 * max_instructions + 8;
Expand Down Expand Up @@ -1038,13 +1042,17 @@ void loop()
}
else
{
if (freq >= 150 * MHZ)
if (freq > overclock_freq_limit * MHZ)
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@dihm dihm Aug 27, 2025

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I have a small concern about this logic tree. If we go from an overclock state to a normal state, the Vreg will be set down before the frequency change, potentially leading to instability.

We should test that hypothesis thoroughly to see if it is a problem before actually changing code though.

{
vreg_set_voltage(VREG_VOLTAGE_1_30);
}
if (freq < 150 * MHZ)
{
vreg_set_voltage(VREG_VOLTAGE_1_10);
fast_serial_printf("WARNING: Requested freq > normal bounds, setting voltage = 1.3 V\n");
vreg_set_voltage(VREG_VOLTAGE_1_30);
}
else if (freq > normal_freq_limit * MHZ && freq <= overclock_freq_limit * MHZ)
{
vreg_set_voltage(VREG_VOLTAGE_1_20);
}
else {
vreg_set_voltage(VREG_VOLTAGE_1_10);
}
if (DEBUG)
{
Expand All @@ -1057,21 +1065,6 @@ void loop()
else
{

#ifndef PRAWNBLASTER_OVERCLOCK
# if PRAWNBLASTER_PICO_BOARD == 1
if (freq > 200 * MHZ)
# elif PRAWNBLASTER_PICO_BOARD == 2
if (freq > 150 * MHZ)
# else
# error "Unsupported PICO_BOARD"
# endif // PICO_BOARD
// Do validation checking on values provided
{
fast_serial_printf("Invalid clock frequency specified\r\n");
return;
}
#endif //PRAWNBLASTER_OVERCLOCK

// Set new clock frequency
if (src == 0)
{
Expand Down