Updates along with SDK1.3.0 release (#181)

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>
2021-11-01 14:41:54 -05:00
parent 146680d625
commit f800a7e303
150 changed files with 4832 additions and 98 deletions
--- a/pio/ir_nec/nec_receive_library/nec_receive.c
+++ b/pio/ir_nec/nec_receive_library/nec_receive.c
@@ -0,0 +1,79 @@
+/**
+ * Copyright (c) 2021 mjcross
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+// SDK types and declarations
+#include "pico/stdlib.h"
+#include "hardware/pio.h"
+#include "hardware/clocks.h"    // for clock_get_hz()
+
+#include "nec_receive.h"
+
+// import the assembled PIO state machine program
+#include "nec_receive.pio.h"
+
+// Claim an unused state machine on the specified PIO and configure it
+// to receive NEC IR frames on the given GPIO pin.
+//
+// Returns: the state machine number on success, otherwise -1
+int nec_rx_init(PIO pio, uint pin_num) {
+
+    // disable pull-up and pull-down on gpio pin
+    gpio_disable_pulls(pin_num);
+
+    // install the program in the PIO shared instruction space
+    uint offset;
+    if (pio_can_add_program(pio, &nec_receive_program)) {
+        offset = pio_add_program(pio, &nec_receive_program);
+    } else {
+        return -1;      // the program could not be added
+    }
+
+    // claim an unused state machine on this PIO
+    int sm = pio_claim_unused_sm(pio, true);
+    if (sm == -1) {
+        return -1;      // we were unable to claim a state machine
+    }
+
+    // configure and enable the state machine
+    nec_receive_program_init(pio, sm, offset, pin_num);
+
+    return sm;
+}
+
+
+// Validate a 32-bit frame and store the address and data at the locations
+// provided.
+//
+// Returns: `true` if the frame was valid, otherwise `false`
+bool nec_decode_frame(uint32_t frame, uint8_t *p_address, uint8_t *p_data) {
+
+    // access the frame data as four 8-bit fields
+    //
+    union {
+        uint32_t raw;
+        struct {
+            uint8_t address;
+            uint8_t inverted_address;
+            uint8_t data;
+            uint8_t inverted_data;
+        };
+    } f;
+
+    f.raw = frame;
+
+    // a valid (non-extended) 'NEC' frame should contain 8 bit
+    // address, inverted address, data and inverted data
+    if (f.address != (f.inverted_address ^ 0xff) ||
+        f.data != (f.inverted_data ^ 0xff)) {
+        return false;
+    }
+
+    // store the validated address and data
+    *p_address = f.address;
+    *p_data = f.data;
+
+    return true;
+}