f800a7e303
Bug fixes and new examples Co-authored-by: Paulo Marques <pm@quant-insight.com> Co-authored-by: martin <admin@crossleys.biz> Co-authored-by: matiasilva <matias.silva@raspberrypi.com> Co-authored-by: Uri Shaked <uri@urishaked.com> Co-authored-by: Diego Solano <diegosolano@gmail.com> Co-authored-by: Andrew Scheller <andrew.scheller@raspberrypi.com> Co-authored-by: Adrian Hesketh <a-h@users.noreply.github.com> Co-authored-by: Emircan Gündoğdu <58917386+emircangun@users.noreply.github.com> Co-authored-by: Josef Wegner <80200012+josefwegner@users.noreply.github.com> Co-authored-by: pmarques-dev <72901351+pmarques-dev@users.noreply.github.com> Co-authored-by: Paulo Marques <pm@quant-insight.com> Co-authored-by: mjcross <mjcross@users.noreply.github.com> Co-authored-by: martin <admin@crossleys.biz>
62 lines
1.8 KiB
Plaintext
62 lines
1.8 KiB
Plaintext
;
|
|
; Copyright (c) 2021 mjcross
|
|
;
|
|
; SPDX-License-Identifier: BSD-3-Clause
|
|
;
|
|
|
|
|
|
.program nec_carrier_burst
|
|
|
|
; Generate bursts of carrier.
|
|
;
|
|
; Repeatedly wait for an IRQ to be set then clear it and generate 21 cycles of
|
|
; carrier with 25% duty cycle
|
|
;
|
|
.define NUM_CYCLES 21 ; how many carrier cycles to generate
|
|
.define BURST_IRQ 7 ; which IRQ should trigger a carrier burst
|
|
.define public TICKS_PER_LOOP 4 ; the number of instructions in the loop (for timing)
|
|
|
|
.wrap_target
|
|
set X, (NUM_CYCLES - 1) ; initialise the loop counter
|
|
wait 1 irq BURST_IRQ ; wait for the IRQ then clear it
|
|
cycle_loop:
|
|
set pins, 1 ; set the pin high (1 cycle)
|
|
set pins, 0 [1] ; set the pin low (2 cycles)
|
|
jmp X--, cycle_loop ; (1 more cycle)
|
|
.wrap
|
|
|
|
|
|
% c-sdk {
|
|
static inline void nec_carrier_burst_program_init(PIO pio, uint sm, uint offset, uint pin, float freq) {
|
|
// Create a new state machine configuration
|
|
//
|
|
pio_sm_config c = nec_carrier_burst_program_get_default_config (offset);
|
|
|
|
// Map the SET pin group to one pin, namely the `pin`
|
|
// parameter to this function.
|
|
//
|
|
sm_config_set_set_pins (&c, pin, 1);
|
|
|
|
// Set the GPIO function of the pin (connect the PIO to the pad)
|
|
//
|
|
pio_gpio_init (pio, pin);
|
|
|
|
// Set the pin direction to output at the PIO
|
|
//
|
|
pio_sm_set_consecutive_pindirs (pio, sm, pin, 1, true);
|
|
|
|
// Set the clock divider to generate the required frequency
|
|
//
|
|
float div = clock_get_hz (clk_sys) / (freq * nec_carrier_burst_TICKS_PER_LOOP);
|
|
sm_config_set_clkdiv (&c, div);
|
|
|
|
// Apply the configuration to the state machine
|
|
//
|
|
pio_sm_init (pio, sm, offset, &c);
|
|
|
|
// Set the state machine running
|
|
//
|
|
pio_sm_set_enabled (pio, sm, true);
|
|
}
|
|
%}
|