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Allow custom SPI pins through defines #59

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Merged
mkalkbrenner merged 3 commits into from
Oct 5, 2026
Merged

Allow custom SPI pins through defines #59

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0df1187
Allow a different SPI base to be assigned
PastorL69 Oct 5, 2026
27e238e
try 12 real quick
PastorL69 Oct 5, 2026
0d75f9d
working, set back to 16.
PastorL69 Oct 5, 2026
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20 changes: 10 additions & 10 deletions src/dmdreader.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -222,20 +222,20 @@ void spi_abort() {
}

/**
* @brief Notify on pin SPI0_CS that data are ready on SPI
* @brief Notify on pin SPI_CS that data is ready
*
* The SPI master (the Pico is slave) should start a data transfer when this
* signal is received It toggles pin SPI0_CS to H
* signal is received It toggles pin SPI_CS to H
*
*/
void start_spi() { digitalWrite(SPI0_CS, HIGH); }
void start_spi() { digitalWrite(DMDREADER_SPI_CS, HIGH); }

/**
* @brief Set pin SPI0_CS to L to signal that there is no active SPI data
* @brief Set pin _CS to L to signal that there is no active SPI data
* transfer
*
*/
void finish_spi() { digitalWrite(SPI0_CS, LOW); }
void finish_spi() { digitalWrite(DMDREADER_SPI_CS, LOW); }

/**
* @brief Cleanly exit SPI by stopping the DMD pio and sending a blank dummy
Expand Down Expand Up @@ -1555,8 +1555,8 @@ bool dmdreader_init(bool return_on_no_detection) {

void dmdreader_spi_init() {
// this is used to notify the Pi that data is available
pinMode(SPI0_CS, OUTPUT);
digitalWrite(SPI0_CS, LOW);
pinMode(DMDREADER_SPI_CS, OUTPUT);
digitalWrite(DMDREADER_SPI_CS, LOW);

// Set up SPI header
h.len = (((target_bytes + 3) / 4) * 4) + sizeof(h) + sizeof(ph);
Expand All @@ -1567,9 +1567,9 @@ void dmdreader_spi_init() {

// initialize SPI slave PIO
dmdreader_error_blink(pio_claim_free_sm_and_add_program_for_gpio_range(
&clocked_output_program, &spi_pio, &spi_sm, &spi_offset, SPI_BASE, 4,
true));
clocked_output_program_init(spi_pio, spi_sm, spi_offset, SPI_BASE);
&clocked_output_program, &spi_pio, &spi_sm, &spi_offset,
DMDREADER_SPI_BASE, 4, true));
clocked_output_program_init(spi_pio, spi_sm, spi_offset, DMDREADER_SPI_BASE);

// DMA for SPI
spi_dma_channel = dma_claim_unused_channel(true);
Expand Down
15 changes: 8 additions & 7 deletions src/dmdreader_pins.h
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Original file line number Diff line number Diff line change
Expand Up @@ -27,11 +27,12 @@
#endif

// SPI Defines
#define SPI0 spi0
#define SPI_BASE 16
#define SPI0_MISO SPI_BASE // 16
#define SPI0_CS (SPI_BASE + 1) // 17
#define SPI0_SCK (SPI_BASE + 2) // 18
#define SPI0_MOSI (SPI_BASE + 3) // 19
#ifndef DMDREADER_SPI_BASE
#define DMDREADER_SPI_BASE 16 // 16 is the default for backwards compatibility
#endif
#define DMDREADER_SPI_MISO SPI_BASE
#define DMDREADER_SPI_CS 17 // Is locked to 17 for all PPUC/DMD revisions
#define DMDREADER_SPI_SCK (DMDREADER_SPI_BASE + 2)
#define DMDREADER_SPI_MOSI (DMDREADER_SPI_BASE + 3)

#endif // DMD_READER_PINS_H
#endif // DMD_READER_PINS_H
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