SPI demo w/W25Q32 chip

gpio/spi_demo/README.md

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+# SPI_DEMO
+
+This is Not intended to be a full demo, but a simple example of how to use the SPI interface on the Flipper Zero.
+
+Please see [https://youtu.be/W6bGYZ5PgIc](https://youtu.be/W6bGYZ5PgIc) for a video demo.  
+
+My video this Saturday, Nov 18th 2023,  will cover how to wire the device between the Flipper Zero and the chip that supports SPI, such as the W25Q32.
+
+The connections are:
+- Flipper Pin 2 - MOSI (D0 on the W25Q32)
+- Flipper Pin 3 - MISO (D1 on the W25Q32)
+- Flipper Pin 4 - CS (CS on the W25Q32)
+- Flipper Pin 5 - SCK (SLK on the W25Q32)
+- Flipper Pin 8 - GND (GND on the W25Q32)
+- Flipper Pin 9 - 3V3 (VCC on the W25Q32)
+
+
+The `Hellow-World.sal` file can be viewed using [https://www.saleae.com/downloads/](https://www.saleae.com/downloads/) software.  This is a capture of my W25Q32 chip being read by the Flipper Zero.  The commands were sent using the `SPI Mem Manager` application.  
+
+You can find the `SPI Mem Manager` application at [https://github.com/flipperdevices/flipperzero-good-faps/tree/dev/spi_mem_manager](https://github.com/flipperdevices/flipperzero-good-faps)

gpio/spi_demo/app.c

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+#include <furi.h>
+#include <furi_hal.h>
+
+void spi_demo();
+void spi_demo_v2();
+
+int32_t main_learn_spi(void* _p) {
+    UNUSED(_p);
+    spi_demo();
+    spi_demo_v2();
+    return 0;
+}

gpio/spi_demo/application.fam

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+App(
+    appid="learn_spi_app",
+    name="[WIP] Learn SPI",
+    apptype=FlipperAppType.EXTERNAL,
+    entry_point="main_learn_spi",
+    stack_size=4 * 1024,
+    requires=[
+        "gui",
+    ],
+    order=10,
+    fap_icon="app.png",
+    fap_category="GPIO",
+    fap_description="Demo of communicating with W25Q32 IC.",
+)

gpio/spi_demo/spi.c

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+/*
+Demo reading from a w25q32 chip using SPI.
+*/
+
+#include <furi.h>
+#include <furi_hal.h>
+
+#define TAG "LearnSPI-SPI"
+
+static uint32_t timeout = 1000;
+static FuriHalSpiBusHandle* spi = &furi_hal_spi_bus_handle_external;
+
+void read_w25q32_spi() {
+    uint8_t command_read_memory[10] = {0x03, 0x0, 0x01, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0};
+    uint8_t data_response[10] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; // Extra space for NULL termination
+
+    furi_hal_spi_acquire(spi);
+
+    if(furi_hal_spi_bus_trx(spi, command_read_memory, data_response, 9, timeout)) {
+        char* data_response_str = (char*)data_response + 4;
+        FURI_LOG_E(
+            TAG,
+            "MESSAGE STORED IN CHIP AT ADDRESS 0x%02X%02X%02X IS: %s",
+            command_read_memory[1],
+            command_read_memory[2],
+            command_read_memory[3],
+            data_response_str);
+    } else {
+        FURI_LOG_E(TAG, "FAILED - read_id_spi failed.");
+    }
+
+    furi_hal_spi_release(spi);
+}
+
+void spi_demo() {
+    furi_hal_spi_bus_handle_init(spi);
+    read_w25q32_spi();
+    furi_hal_spi_bus_handle_deinit(spi);
+}

gpio/spi_demo/spi_v2.c

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+/*
+Improved demo reading from a w25q32 chip using SPI.
+*/
+
+#include <furi.h>
+#include <furi_hal.h>
+
+#define TAG "LearnSPI-SPI-V2"
+
+static uint32_t timeout = 1000;
+static FuriHalSpiBusHandle* spi = &furi_hal_spi_bus_handle_external;
+
+void read_w25q32_spi_v2() {
+    uint8_t command_read_memory[1] = {0x03}; // Read command
+    uint8_t read_memory_address[3] = {0x00, 0x01, 0x00}; // Memory address is 0x000100
+    uint8_t data_response[6] = {0, 0, 0, 0, 0, 0}; // Read 5 bytes + NULL terminator.
+
+    furi_hal_spi_acquire(spi);
+
+    if(furi_hal_spi_bus_tx(spi, command_read_memory, 1, timeout) &&
+       furi_hal_spi_bus_tx(spi, read_memory_address, 3, timeout) &&
+       (furi_hal_spi_bus_rx(spi, data_response, 5, timeout))) {
+        char* data_response_str = (char*)data_response;
+        FURI_LOG_E(
+            TAG,
+            "MESSAGE STORED IN CHIP AT ADDRESS 0x%02X%02X%02X IS: %s",
+            read_memory_address[0],
+            read_memory_address[1],
+            read_memory_address[2],
+            data_response_str);
+    } else {
+        FURI_LOG_E(TAG, "FAILED - read_id_spi failed.");
+    }
+
+    furi_hal_spi_release(spi);
+}
+
+void spi_demo_v2() {
+    furi_hal_spi_bus_handle_init(spi);
+    read_w25q32_spi_v2();
+    furi_hal_spi_bus_handle_deinit(spi);
+}