329 lines
11 KiB
C
329 lines
11 KiB
C
/*
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@CodeAllNight
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https://github.com/jamisonderek/flipper-zero-tutorials
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This is a basic demonstration of reading/writing I2C protocol.
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For this demo, we connect a I2C device to pins:
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- 3V3 (3V3, pin 9) = VCC
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- GND (GND, pin 18) = GND
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- SCL (C0, pin 16) = SCL
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- SDA (C1, pin 15) = SDA
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*/
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#include <furi.h>
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#include <furi_hal.h>
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#include <furi_hal_gpio.h>
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#include <furi_hal_resources.h>
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#include <gui/gui.h>
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#include <locale/locale.h>
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typedef enum {
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I2cDemoStateNotFound,
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I2cDemoStateFound,
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I2cDemoStateWriteSuccess,
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I2cDemoStateReadSuccess,
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I2cDemoStateWriteReadSuccess,
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} I2cDemoState;
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typedef enum {
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DemoEventTypeTick,
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DemoEventTypeKey,
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// You can add additional events here.
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} DemoEventType;
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typedef struct {
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DemoEventType type; // The reason for this event.
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InputEvent input; // This data is specific to keypress data.
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// You can add additional data that is helpful for your events.
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} DemoEvent;
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typedef struct {
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FuriString* buffer;
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// You can add additional state here.
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int address;
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I2cDemoState state;
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uint16_t value;
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} DemoData;
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typedef struct {
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FuriMessageQueue* queue; // Message queue (DemoEvent items to process).
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FuriMutex* mutex; // Used to provide thread safe access to data.
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DemoData* data; // Data accessed by multiple threads (acquire the mutex before accessing!)
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} DemoContext;
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// Invoked when input (button press) is detected. We queue a message and then return to the caller.
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static void input_callback(InputEvent* input_event, FuriMessageQueue* queue) {
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furi_assert(queue);
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DemoEvent event = {.type = DemoEventTypeKey, .input = *input_event};
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furi_message_queue_put(queue, &event, FuriWaitForever);
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}
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// Invoked by the timer on every tick. We queue a message and then return to the caller.
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static void tick_callback(void* ctx) {
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furi_assert(ctx);
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FuriMessageQueue* queue = ctx;
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DemoEvent event = {.type = DemoEventTypeTick};
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// It's OK to loose this event if system overloaded (so we don't pass a wait value for 3rd parameter.)
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furi_message_queue_put(queue, &event, 0);
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}
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// Invoked by the draw callback to render the screen. We render our UI on the callback thread.
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static void render_callback(Canvas* canvas, void* ctx) {
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// Attempt to aquire context, so we can read the data.
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DemoContext* demo_context = ctx;
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if(furi_mutex_acquire(demo_context->mutex, 200) != FuriStatusOk) {
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return;
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}
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DemoData* data = demo_context->data;
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canvas_set_font(canvas, FontPrimary);
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if(data->address) {
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canvas_draw_str_aligned(canvas, 64, 20, AlignCenter, AlignCenter, "FOUND I2C DEVICE");
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furi_string_printf(data->buffer, "Address 0x%02x", (data->address));
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canvas_draw_str_aligned(
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canvas, 64, 30, AlignCenter, AlignCenter, furi_string_get_cstr(data->buffer));
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if(data->state == I2cDemoStateWriteSuccess) {
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canvas_draw_str_aligned(canvas, 64, 40, AlignCenter, AlignCenter, "WRITE SUCCESS");
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} else if(data->state == I2cDemoStateReadSuccess) {
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canvas_draw_str_aligned(canvas, 64, 40, AlignCenter, AlignCenter, "READ SUCCESS");
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} else if(data->state == I2cDemoStateFound) {
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canvas_draw_str_aligned(canvas, 64, 40, AlignCenter, AlignCenter, "FOUND DEVICE");
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} else if(data->state == I2cDemoStateWriteReadSuccess) {
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canvas_draw_str_aligned(
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canvas, 64, 40, AlignCenter, AlignCenter, "WRITE/READ SUCCESS");
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}
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furi_string_printf(data->buffer, "value %d", (data->value));
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canvas_draw_str_aligned(
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canvas, 64, 50, AlignCenter, AlignCenter, furi_string_get_cstr(data->buffer));
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} else {
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canvas_draw_str_aligned(canvas, 64, 20, AlignCenter, AlignCenter, "I2C NOT FOUND");
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canvas_draw_str_aligned(canvas, 64, 30, AlignCenter, AlignCenter, "pin15=SDA. pin16=SCL");
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canvas_draw_str_aligned(canvas, 64, 40, AlignCenter, AlignCenter, "pin9=VCC. pin18=GND");
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}
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// Release the context, so other threads can update the data.
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furi_mutex_release(demo_context->mutex);
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}
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void demo_i2c_call() {
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uint8_t addr = 0x46;
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uint8_t reg = 0x20;
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uint8_t value8 = 0;
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uint16_t value16 = 0;
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uint8_t buffer[3] = {0x20, 0, 0};
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uint32_t timeout = 100;
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furi_hal_i2c_acquire(&furi_hal_i2c_handle_external);
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// Typically you use one of the following methods...
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furi_hal_i2c_is_device_ready(&furi_hal_i2c_handle_external, addr, timeout);
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furi_hal_i2c_tx(&furi_hal_i2c_handle_external, addr, buffer, 1, timeout);
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furi_hal_i2c_rx(&furi_hal_i2c_handle_external, addr, buffer, 1, timeout);
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furi_hal_i2c_trx(&furi_hal_i2c_handle_external, addr, buffer, 1, buffer, 2, timeout);
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// or one of these helper methods...
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furi_hal_i2c_write_reg_8(&furi_hal_i2c_handle_external, addr, reg, value8, timeout);
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furi_hal_i2c_write_reg_16(&furi_hal_i2c_handle_external, addr, reg, value16, timeout);
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furi_hal_i2c_read_reg_8(&furi_hal_i2c_handle_external, addr, reg, &value8, timeout);
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furi_hal_i2c_read_reg_16(&furi_hal_i2c_handle_external, addr, reg, &value16, timeout);
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furi_hal_i2c_release(&furi_hal_i2c_handle_external);
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}
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uint8_t demo_i2c_find_device() {
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uint8_t addr = 0;
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furi_hal_i2c_acquire(&furi_hal_i2c_handle_external);
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for(uint8_t try_addr = 0; try_addr != 0xff; try_addr++) {
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if(furi_hal_i2c_is_device_ready(&furi_hal_i2c_handle_external, try_addr, 5)) {
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addr = try_addr;
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break;
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}
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}
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furi_hal_i2c_release(&furi_hal_i2c_handle_external);
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return addr;
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}
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bool demo_i2c_init_bh1750(uint8_t addr) {
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bool result = false;
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uint8_t buffer[1];
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buffer[0] = 0x1; // write a 0x1 to init a BH1750 device.
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furi_hal_i2c_acquire(&furi_hal_i2c_handle_external);
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result = furi_hal_i2c_tx(&furi_hal_i2c_handle_external, addr, buffer, 1, 100);
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furi_hal_i2c_release(&furi_hal_i2c_handle_external);
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return result;
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}
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bool demo_i2c_write_one_time_h_res_mode_bh1750(uint8_t addr) {
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bool result = false;
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uint8_t buffer[1] = {
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0x20}; // write a 0x20 for "One Time H-Resolution Mode" from BH1750 device.
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furi_hal_i2c_acquire(&furi_hal_i2c_handle_external);
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if(furi_hal_i2c_tx(&furi_hal_i2c_handle_external, addr, buffer, 1, 100)) {
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result = true;
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}
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furi_hal_i2c_release(&furi_hal_i2c_handle_external);
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return result;
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}
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bool demo_i2c_read_one_time_h_res_mode_bh1750(uint8_t addr, uint16_t* value) {
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bool result = false;
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uint8_t buffer[2];
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furi_hal_i2c_acquire(&furi_hal_i2c_handle_external);
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// Read 2 bytes from BH1750 device.
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if(furi_hal_i2c_rx(&furi_hal_i2c_handle_external, addr, buffer, 2, 100)) {
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*value = (buffer[0] << 8) | buffer[1];
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result = true;
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}
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furi_hal_i2c_release(&furi_hal_i2c_handle_external);
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return result;
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}
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bool demo_i2c_write_read_bh1750(uint8_t addr, uint16_t* value) {
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bool result = false;
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uint8_t buffer[2] = {
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0x20, 0}; // write a 0x20 for "One Time H-Resolution Mode" from BH1750 device.
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furi_hal_i2c_acquire(&furi_hal_i2c_handle_external);
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if(furi_hal_i2c_trx(&furi_hal_i2c_handle_external, addr, buffer, 1, buffer, 2, 100)) {
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*value = (buffer[0] << 8) | buffer[1];
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result = true;
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}
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furi_hal_i2c_release(&furi_hal_i2c_handle_external);
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return result;
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}
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bool demo_i2c_read_reg_bh1750(uint8_t addr, uint16_t* value) {
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bool result = false;
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furi_hal_i2c_acquire(&furi_hal_i2c_handle_external);
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if(furi_hal_i2c_read_reg_16(&furi_hal_i2c_handle_external, addr, 0x20, value, 100)) {
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result = true;
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}
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furi_hal_i2c_release(&furi_hal_i2c_handle_external);
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return result;
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}
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// Our main loop invokes this method after acquiring the mutex, so we can safely access the protected data.
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static void update_i2c_status(void* ctx) {
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DemoContext* demo_context = ctx;
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DemoData* data = demo_context->data;
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uint8_t addr = 0;
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addr = demo_i2c_find_device();
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if(addr) {
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data->state = I2cDemoStateFound;
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if(demo_i2c_init_bh1750(addr)) {
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data->state = I2cDemoStateWriteSuccess;
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if(demo_i2c_write_one_time_h_res_mode_bh1750(addr)) {
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data->state = I2cDemoStateWriteSuccess;
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if(demo_i2c_read_one_time_h_res_mode_bh1750(addr, &data->value)) {
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data->state = I2cDemoStateReadSuccess;
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if(demo_i2c_write_read_bh1750(addr, &data->value)) {
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data->state = I2cDemoStateWriteReadSuccess;
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}
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}
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}
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}
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}
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data->address = addr;
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}
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int32_t i2c_demo_app(void* p) {
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UNUSED(p);
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// Configure our initial data.
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DemoContext* demo_context = malloc(sizeof(DemoContext));
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demo_context->mutex = furi_mutex_alloc(FuriMutexTypeNormal);
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demo_context->data = malloc(sizeof(DemoData));
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demo_context->data->buffer = furi_string_alloc();
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demo_context->data->address = 0;
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demo_context->data->state = I2cDemoStateNotFound;
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demo_context->data->value = 0;
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// Queue for events (tick or input)
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demo_context->queue = furi_message_queue_alloc(8, sizeof(DemoEvent));
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// Set ViewPort callbacks
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ViewPort* view_port = view_port_alloc();
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view_port_draw_callback_set(view_port, render_callback, demo_context);
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view_port_input_callback_set(view_port, input_callback, demo_context->queue);
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// Open GUI and register view_port
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Gui* gui = furi_record_open(RECORD_GUI);
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gui_add_view_port(gui, view_port, GuiLayerFullscreen);
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// Update the screen fairly frequently (every 1000 milliseconds = 1 second.)
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FuriTimer* timer = furi_timer_alloc(tick_callback, FuriTimerTypePeriodic, demo_context->queue);
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furi_timer_start(timer, 1000);
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demo_i2c_call();
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// Main loop
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DemoEvent event;
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bool processing = true;
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do {
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if(furi_message_queue_get(demo_context->queue, &event, FuriWaitForever) == FuriStatusOk) {
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switch(event.type) {
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case DemoEventTypeKey:
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// Short press of back button exits the program.
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if(event.input.type == InputTypeShort && event.input.key == InputKeyBack) {
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processing = false;
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}
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break;
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case DemoEventTypeTick:
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// Every timer tick we update the i2c status.
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furi_mutex_acquire(demo_context->mutex, FuriWaitForever);
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update_i2c_status(demo_context);
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furi_mutex_release(demo_context->mutex);
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break;
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default:
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break;
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}
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// Send signal to update the screen (callback will get invoked at some point later.)
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view_port_update(view_port);
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} else {
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// We had an issue getting message from the queue, so exit application.
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processing = false;
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}
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} while(processing);
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// Free resources
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furi_timer_free(timer);
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view_port_enabled_set(view_port, false);
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gui_remove_view_port(gui, view_port);
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view_port_free(view_port);
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furi_record_close(RECORD_GUI);
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furi_message_queue_free(demo_context->queue);
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furi_mutex_free(demo_context->mutex);
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furi_string_free(demo_context->data->buffer);
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free(demo_context->data);
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free(demo_context);
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return 0;
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} |