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Overclocking support #11

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Merged
mkalkbrenner merged 4 commits into from
Nov 9, 2025
Merged

Overclocking support #11

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1670569
lift pico to 200MHz clock, officially supported by rpi
PastorL69 Nov 8, 2025
3732a37
actually set the OC
PastorL69 Nov 8, 2025
3b2c6fa
adjust pio program clockdiv based on 200MHz OC
PastorL69 Nov 8, 2025
ff33430
Merge branch 'ppuc' into overclock
mkalkbrenner Nov 9, 2025
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1 change: 1 addition & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -46,6 +46,7 @@ target_link_libraries(${PROJECT_NAME} pico_stdlib)

# Add any user requested libraries
target_link_libraries(${PROJECT_NAME}
hardware_clocks
hardware_spi
hardware_dma
hardware_pio
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9 changes: 9 additions & 0 deletions src/dmd_reader.c
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Expand Up @@ -7,6 +7,7 @@
#include "dmd_counter.h"
#include "dmd_interface.h"
#include "dmd_reader_pins.h"
#include "hardware/clocks.h"
#include "hardware/dma.h"
#include "hardware/gpio.h"
#include "hardware/irq.h"
Expand All @@ -21,6 +22,9 @@
// supress duplicate frames (implies USE_CRC)
#define SUPRESS_DUPLICATES

// set to officially supported 200MHz clock
#define SYS_CLK_MHZ 200

/**
* Glossary
*
Expand Down Expand Up @@ -504,6 +508,11 @@ bool init() {

printf("DMD reader starting\n");

// overclock to achieve higher SPI transfer speed
set_sys_clock_khz(SYS_CLK_MHZ * 1000, true);
uint32_t freq = clock_get_hz(clk_sys);
printf("System clock: %.2f MHz\n", freq / 1e6);

// this is used to notify the Pi that data is available
gpio_init(SPI0_CS);
gpio_set_dir(SPI0_CS, GPIO_OUT);
Expand Down