Initial Release

dma/channel_irq/pio_serialiser.pio

@@ -0,0 +1,27 @@
+;
+; Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+;
+; SPDX-License-Identifier: BSD-3-Clause
+;
+
+.program pio_serialiser
+
+; Just serialise a stream of bits. Take 32 bits from each FIFO record. LSB-first.
+
+.wrap_target
+    out pins, 1
+.wrap
+
+% c-sdk {
+static inline void pio_serialiser_program_init(PIO pio, uint sm, uint offset, uint data_pin, float clk_div) {
+    pio_gpio_init(pio, data_pin);
+    pio_sm_set_consecutive_pindirs(pio, sm, data_pin, 1, true);
+    pio_sm_config c = pio_serialiser_program_get_default_config(offset);
+    sm_config_set_out_pins(&c, data_pin, 1);
+    sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
+    sm_config_set_clkdiv(&c, clk_div);
+    sm_config_set_out_shift(&c, true, true, 32);
+    pio_sm_init(pio, sm, offset, &c);
+    pio_sm_set_enabled(pio, sm, true);
+}
+%}