split c from asm code

Author: mkalkbrenner

src/dmd_interface_desega.h

@@ -0,0 +1,53 @@
+#ifndef DMD_INTERFACE_DESEGA_H
+#define DMD_INTERFACE_DESEGA_H
+
+#include "dmd_interface_desega.pio.h"
+#include "hardware/gpio.h"
+#include "hardware/pio.h"
+
+static inline void dmd_reader_desega_program_init(PIO pio, uint sm,
+                                                  uint offset) {
+  pio_sm_config c = dmd_reader_desega_program_get_default_config(offset);
+
+  // Set the IN pin, we don't use any other
+  sm_config_set_in_pins(&c, desega_SDATA);
+
+  // Set the pin direction at the PIO
+  pio_sm_set_consecutive_pindirs(pio, sm, desega_SDATA, 2,
+                                 false);  // SDATA, DOTCLK
+
+  // Connect these GPIOs to this PIO block
+  pio_gpio_init(pio, desega_DOTCLK);
+  pio_gpio_init(pio, desega_SDATA);
+
+  // Shifting to left matches the customary MSB-first ordering of SPI.
+  sm_config_set_in_shift(&c,
+                         false,  // Shift-to-right = false
+                         true,   // Autopull enabled
+                         32      // Autopull threshold
+  );
+
+  // We only send, so disable the TX FIFO to make the RX FIFO deeper.
+  sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_RX);
+
+  // Load our configuration, do not yet start the program
+  pio_sm_init(pio, sm, offset, &c);
+}
+
+static inline void dmd_framedetect_desega_program_init(PIO pio, uint sm,
+                                                       uint offset) {
+  pio_sm_config c = dmd_framedetect_desega_program_get_default_config(offset);
+  // DE is used for jump control
+  sm_config_set_jmp_pin(&c, desega_DE);
+
+  // Set the pin direction at the PIO
+  pio_sm_set_consecutive_pindirs(pio, sm, desega_DE, 1, false);
+
+  // Connect this GPIO to this PIO block
+  pio_gpio_init(pio, desega_DE);
+
+  // Load our configuration, do not yet start the program
+  pio_sm_init(pio, sm, offset, &c);
+}
+
+#endif  // DMD_INTERFACE_DESEGA_H

src/dmd_interface_spike.pio

@@ -41,13 +41,13 @@ dotloop:
 
 
 .program dmd_framedetect_spike
-; Frame detection in Spike:
-; white for RDATA to go H
-; check if it is still H 150-250ms later - in this case, this is the most significant bit
-; which is the last plane
-; now wait for RDATA to go L and H again, this is the beginning of a new frame
-; based on 125MHz clock frequency we have to wait 18750-31250 clock cycles
-; we use 24576 here, because it0s 0b11 << 13
+    ; Frame detection in Spike:
+    ; white for RDATA to go H
+    ; check if it is still H 150-250ms later - in this case, this is the most significant bit
+    ; which is the last plane
+    ; now wait for RDATA to go L and H again, this is the beginning of a new frame
+    ; based on 125MHz clock frequency we have to wait 18750-31250 clock cycles
+    ; we use 24576 here, because it0s 0b11 << 13
 
     ; initialize isr with 24576
     set x, 3