JavaScript: SPI implementation

CHANGELOG.md

@@ -75,6 +75,7 @@
 - Updater: New Yappy themed icon while updating (#253 by @the1anonlypr3 & @Kuronons & @nescap)
 - JS:
   - New `i2c` module (#259 by @jamisonderek)
+  - New `spi` module (#272 by @jamisonderek)
 - BadKB:
   - OFW: Add linux/gnome badusb demo files (by @thomasnemer)
   - Add older qFlipper install demos for windows and macos (by @DXVVAY & @grugnoymeme)

applications/system/js_app/application.fam

@@ -216,3 +216,11 @@ App(
     requires=["js_app"],
     sources=["modules/js_i2c.c"],
 )
+
+App(
+    appid="js_spi",
+    apptype=FlipperAppType.PLUGIN,
+    entry_point="js_spi_ep",
+    requires=["js_app"],
+    sources=["modules/js_spi.c"],
+)

applications/system/js_app/examples/apps/Scripts/Examples/spi.js

@@ -0,0 +1,88 @@
+// Connect a w25q32 SPI device to the Flipper Zero.
+// D1=pin 2 (MOSI), SLK=pin 5 (SCK), GND=pin 8 (GND), D0=pin 3 (MISO), CS=pin 4 (CS), VCC=pin 9 (3V3)
+let spi = require("spi");
+
+// Display textbox so user can scroll to see all output.
+let eventLoop = require("event_loop");
+let gui = require("gui");
+let text = "SPI demo\n";
+let textBox = require("gui/text_box").makeWith({
+    focus: "end",
+    font: "text",
+    text: text,
+});
+
+function addText(add) {
+    text += add;
+    textBox.set("text", text);
+}
+
+gui.viewDispatcher.switchTo(textBox);
+
+// writeRead returns a buffer the same length as the input buffer.
+// We send 6 bytes of data, starting with 0x90, which is the command to read the manufacturer ID.
+// Can also use Uint8Array([0x90, 0x00, ...]) as write parameter
+// Optional timeout parameter in ms. We set to 100ms.
+let data_buf = spi.writeRead([0x90, 0x0, 0x0, 0x0, 0x0, 0x0], 100);
+let data = Uint8Array(data_buf);
+if (data.length === 6) {
+    if (data[4] === 0xEF) {
+        addText("Found Winbond device\n");
+        if (data[5] === 0x15) {
+            addText("Device ID: W25Q32\n");
+        } else {
+            addText("Unknown device ID: " + data[5].toString(16) + "\n");
+        }
+    } else if (data[4] === 0x0) {
+        addText("Be sure Winbond W25Q32 is connected to Flipper Zero SPI pins.\n");
+    } else {
+        addText("Unknown device. Manufacturer ID: " + data[4].toString(16) + "\n");
+    }
+}
+
+addText("\nReading JEDEC ID\n");
+
+// Acquire the SPI bus. Multiple calls will happen with Chip Select (CS) held low.
+spi.acquire();
+
+// Send command (0x9F) to read JEDEC ID.
+// Can also use Uint8Array([0x9F]) as write parameter
+// Note: you can pass an optional timeout parameter in milliseconds.
+spi.write([0x9F]);
+
+// Request 3 bytes of data.
+// Note: you can pass an optional timeout parameter in milliseconds.
+data_buf = spi.read(3);
+
+// Release the SPI bus as soon as we are done with the set of SPI commands.
+spi.release();
+
+data = Uint8Array(data_buf);
+addText("JEDEC MF ID: " + data[0].toString(16) + "\n");
+addText("JEDEC Memory Type: " + data[1].toString(16) + "\n");
+addText("JEDEC Capacity ID: " + data[2].toString(16) + "\n");
+
+if (data[0] === 0xEF) {
+    addText("Found Winbond device\n");
+}
+let capacity = data[1] << 8 | data[2];
+if (capacity === 0x4016) {
+    addText("Device: W25Q32\n");
+} else if (capacity === 0x4015) {
+    addText("Device: W25Q16\n");
+} else if (capacity === 0x4014) {
+    addText("Device: W25Q80\n");
+} else {
+    addText("Unknown device\n");
+}
+
+// Wait for user to close the app
+eventLoop.subscribe(gui.viewDispatcher.navigation, function (_sub, _, eventLoop) {
+    eventLoop.stop();
+}, eventLoop);
+
+// This script has no interaction, only textbox, so event loop doesn't need to be running all the time
+// We run it at the end to accept input for the back button press to quit
+// But before that, user sees a textbox and pressing back has no effect
+// This is fine because it allows simpler logic and the code above takes no time at all to run
+eventLoop.run();

applications/system/js_app/modules/js_spi.c

@@ -0,0 +1,283 @@
+#include "../js_modules.h"
+#include <furi_hal_spi.h>
+
+typedef struct {
+    bool acquired_bus;
+} JsSpiInst;
+
+static JsSpiInst* get_this_ctx(struct mjs* mjs) {
+    mjs_val_t obj_inst = mjs_get(mjs, mjs_get_this(mjs), INST_PROP_NAME, ~0);
+    JsSpiInst* spi = mjs_get_ptr(mjs, obj_inst);
+    furi_assert(spi);
+    return spi;
+}
+
+static void ret_bad_args(struct mjs* mjs, const char* error) {
+    mjs_prepend_errorf(mjs, MJS_BAD_ARGS_ERROR, "%s", error);
+    mjs_return(mjs, MJS_UNDEFINED);
+}
+
+static bool check_arg_count_range(struct mjs* mjs, size_t min_count, size_t max_count) {
+    size_t num_args = mjs_nargs(mjs);
+    if(num_args < min_count || num_args > max_count) {
+        ret_bad_args(mjs, "Wrong argument count");
+        return false;
+    }
+    return true;
+}
+
+static void js_spi_acquire(struct mjs* mjs) {
+    if(!check_arg_count_range(mjs, 0, 0)) return;
+    JsSpiInst* spi = get_this_ctx(mjs);
+    if(!spi->acquired_bus) {
+        furi_hal_spi_acquire(&furi_hal_spi_bus_handle_external);
+        spi->acquired_bus = true;
+    }
+    mjs_return(mjs, MJS_UNDEFINED);
+}
+
+static void js_spi_release(struct mjs* mjs) {
+    if(!check_arg_count_range(mjs, 0, 0)) return;
+    JsSpiInst* spi = get_this_ctx(mjs);
+    if(spi->acquired_bus) {
+        furi_hal_spi_release(&furi_hal_spi_bus_handle_external);
+        spi->acquired_bus = false;
+    }
+    mjs_return(mjs, MJS_UNDEFINED);
+}
+
+static bool js_spi_is_acquired(struct mjs* mjs) {
+    JsSpiInst* spi = get_this_ctx(mjs);
+    return spi->acquired_bus;
+}
+
+static void js_spi_write(struct mjs* mjs) {
+    if(!check_arg_count_range(mjs, 1, 2)) return;
+
+    mjs_val_t tx_buf_arg = mjs_arg(mjs, 0);
+    bool tx_buf_was_allocated = false;
+    uint8_t* tx_buf = NULL;
+    size_t tx_len = 0;
+    if(mjs_is_array(tx_buf_arg)) {
+        tx_len = mjs_array_length(mjs, tx_buf_arg);
+        if(tx_len == 0) {
+            ret_bad_args(mjs, "Data array must not be empty");
+            return;
+        }
+        tx_buf = malloc(tx_len);
+        tx_buf_was_allocated = true;
+        for(size_t i = 0; i < tx_len; i++) {
+            mjs_val_t val = mjs_array_get(mjs, tx_buf_arg, i);
+            if(!mjs_is_number(val)) {
+                ret_bad_args(mjs, "Data array must contain only numbers");
+                free(tx_buf);
+                return;
+            }
+            uint32_t byte_val = mjs_get_int32(mjs, val);
+            if(byte_val > 0xFF) {
+                ret_bad_args(mjs, "Data array values must be 0-255");
+                free(tx_buf);
+                return;
+            }
+            tx_buf[i] = byte_val;
+        }
+    } else if(mjs_is_typed_array(tx_buf_arg)) {
+        mjs_val_t array_buf = tx_buf_arg;
+        if(mjs_is_data_view(tx_buf_arg)) {
+            array_buf = mjs_dataview_get_buf(mjs, tx_buf_arg);
+        }
+        tx_buf = (uint8_t*)mjs_array_buf_get_ptr(mjs, array_buf, &tx_len);
+        if(tx_len == 0) {
+            ret_bad_args(mjs, "Data array must not be empty");
+            return;
+        }
+    } else {
+        ret_bad_args(mjs, "Data must be an array, arraybuf or dataview");
+        return;
+    }
+
+    uint32_t timeout = 1;
+    if(mjs_nargs(mjs) > 1) { // Timeout is optional argument
+        mjs_val_t timeout_arg = mjs_arg(mjs, 1);
+        if(!mjs_is_number(timeout_arg)) {
+            ret_bad_args(mjs, "Timeout must be a number");
+            if(tx_buf_was_allocated) free(tx_buf);
+            return;
+        }
+        timeout = mjs_get_int32(mjs, timeout_arg);
+    }
+
+    if(!js_spi_is_acquired(mjs)) {
+        furi_hal_spi_acquire(&furi_hal_spi_bus_handle_external);
+    }
+    bool result = furi_hal_spi_bus_tx(&furi_hal_spi_bus_handle_external, tx_buf, tx_len, timeout);
+    if(!js_spi_is_acquired(mjs)) {
+        furi_hal_spi_release(&furi_hal_spi_bus_handle_external);
+    }
+
+    if(tx_buf_was_allocated) free(tx_buf);
+    mjs_return(mjs, mjs_mk_boolean(mjs, result));
+}
+
+static void js_spi_read(struct mjs* mjs) {
+    if(!check_arg_count_range(mjs, 1, 2)) return;
+
+    mjs_val_t rx_len_arg = mjs_arg(mjs, 0);
+    if(!mjs_is_number(rx_len_arg)) {
+        ret_bad_args(mjs, "Length must be a number");
+        return;
+    }
+    size_t rx_len = mjs_get_int32(mjs, rx_len_arg);
+    if(rx_len == 0) {
+        ret_bad_args(mjs, "Length must not zero");
+        return;
+    }
+
+    uint8_t* rx_buf = malloc(rx_len);
+
+    uint32_t timeout = 1;
+    if(mjs_nargs(mjs) > 1) { // Timeout is optional argument
+        mjs_val_t timeout_arg = mjs_arg(mjs, 1);
+        if(!mjs_is_number(timeout_arg)) {
+            ret_bad_args(mjs, "Timeout must be a number");
+            free(rx_buf);
+            return;
+        }
+        timeout = mjs_get_int32(mjs, timeout_arg);
+    }
+
+    if(!js_spi_is_acquired(mjs)) {
+        furi_hal_spi_acquire(&furi_hal_spi_bus_handle_external);
+    }
+    bool result = furi_hal_spi_bus_rx(&furi_hal_spi_bus_handle_external, rx_buf, rx_len, timeout);
+    if(!js_spi_is_acquired(mjs)) {
+        furi_hal_spi_release(&furi_hal_spi_bus_handle_external);
+    }
+
+    mjs_val_t ret = MJS_UNDEFINED;
+    if(result) {
+        ret = mjs_mk_array_buf(mjs, (char*)rx_buf, rx_len);
+    }
+    free(rx_buf);
+    mjs_return(mjs, ret);
+}
+
+static void js_spi_write_read(struct mjs* mjs) {
+    if(!check_arg_count_range(mjs, 1, 2)) return;
+
+    mjs_val_t tx_buf_arg = mjs_arg(mjs, 0);
+    bool tx_buf_was_allocated = false;
+    uint8_t* tx_buf = NULL;
+    size_t data_len = 0;
+    if(mjs_is_array(tx_buf_arg)) {
+        data_len = mjs_array_length(mjs, tx_buf_arg);
+        if(data_len == 0) {
+            ret_bad_args(mjs, "Data array must not be empty");
+            return;
+        }
+        tx_buf = malloc(data_len);
+        tx_buf_was_allocated = true;
+        for(size_t i = 0; i < data_len; i++) {
+            mjs_val_t val = mjs_array_get(mjs, tx_buf_arg, i);
+            if(!mjs_is_number(val)) {
+                ret_bad_args(mjs, "Data array must contain only numbers");
+                free(tx_buf);
+                return;
+            }
+            uint32_t byte_val = mjs_get_int32(mjs, val);
+            if(byte_val > 0xFF) {
+                ret_bad_args(mjs, "Data array values must be 0-255");
+                free(tx_buf);
+                return;
+            }
+            tx_buf[i] = byte_val;
+        }
+    } else if(mjs_is_typed_array(tx_buf_arg)) {
+        mjs_val_t array_buf = tx_buf_arg;
+        if(mjs_is_data_view(tx_buf_arg)) {
+            array_buf = mjs_dataview_get_buf(mjs, tx_buf_arg);
+        }
+        tx_buf = (uint8_t*)mjs_array_buf_get_ptr(mjs, array_buf, &data_len);
+        if(data_len == 0) {
+            ret_bad_args(mjs, "Data array must not be empty");
+            return;
+        }
+    } else {
+        ret_bad_args(mjs, "Data must be an array, arraybuf or dataview");
+        return;
+    }
+
+    uint8_t* rx_buf = malloc(data_len); // RX and TX are same length for SPI writeRead.
+
+    uint32_t timeout = 1;
+    if(mjs_nargs(mjs) > 1) { // Timeout is optional argument
+        mjs_val_t timeout_arg = mjs_arg(mjs, 1);
+        if(!mjs_is_number(timeout_arg)) {
+            ret_bad_args(mjs, "Timeout must be a number");
+            if(tx_buf_was_allocated) free(tx_buf);
+            free(rx_buf);
+            return;
+        }
+        timeout = mjs_get_int32(mjs, timeout_arg);
+    }
+
+    if(!js_spi_is_acquired(mjs)) {
+        furi_hal_spi_acquire(&furi_hal_spi_bus_handle_external);
+    }
+    bool result =
+        furi_hal_spi_bus_trx(&furi_hal_spi_bus_handle_external, tx_buf, rx_buf, data_len, timeout);
+    if(!js_spi_is_acquired(mjs)) {
+        furi_hal_spi_release(&furi_hal_spi_bus_handle_external);
+    }
+
+    mjs_val_t ret = MJS_UNDEFINED;
+    if(result) {
+        ret = mjs_mk_array_buf(mjs, (char*)rx_buf, data_len);
+    }
+    if(tx_buf_was_allocated) free(tx_buf);
+    free(rx_buf);
+    mjs_return(mjs, ret);
+}
+
+static void* js_spi_create(struct mjs* mjs, mjs_val_t* object, JsModules* modules) {
+    UNUSED(modules);
+    JsSpiInst* spi = (JsSpiInst*)malloc(sizeof(JsSpiInst));
+    spi->acquired_bus = false;
+    mjs_val_t spi_obj = mjs_mk_object(mjs);
+    mjs_set(mjs, spi_obj, INST_PROP_NAME, ~0, mjs_mk_foreign(mjs, spi));
+    mjs_set(mjs, spi_obj, "acquire", ~0, MJS_MK_FN(js_spi_acquire));
+    mjs_set(mjs, spi_obj, "release", ~0, MJS_MK_FN(js_spi_release));
+    mjs_set(mjs, spi_obj, "write", ~0, MJS_MK_FN(js_spi_write));
+    mjs_set(mjs, spi_obj, "read", ~0, MJS_MK_FN(js_spi_read));
+    mjs_set(mjs, spi_obj, "writeRead", ~0, MJS_MK_FN(js_spi_write_read));
+    *object = spi_obj;
+
+    furi_hal_spi_bus_handle_init(&furi_hal_spi_bus_handle_external);
+    return (void*)spi;
+}
+
+static void js_spi_destroy(void* inst) {
+    JsSpiInst* spi = (JsSpiInst*)inst;
+    if(spi->acquired_bus) {
+        furi_hal_spi_release(&furi_hal_spi_bus_handle_external);
+    }
+    free(spi);
+    furi_hal_spi_bus_handle_deinit(&furi_hal_spi_bus_handle_external);
+}
+
+static const JsModuleDescriptor js_spi_desc = {
+    "spi",
+    js_spi_create,
+    js_spi_destroy,
+    NULL,
+};
+
+static const FlipperAppPluginDescriptor spi_plugin_descriptor = {
+    .appid = PLUGIN_APP_ID,
+    .ep_api_version = PLUGIN_API_VERSION,
+    .entry_point = &js_spi_desc,
+};
+
+const FlipperAppPluginDescriptor* js_spi_ep(void) {
+    return &spi_plugin_descriptor;
+}