#ifndef _EPICARDIUM_H
#define _EPICARDIUM_H
#include <stdint.h>
#include <errno.h>
#ifndef __SPHINX_DOC
/* Some headers are not recognized by hawkmoth for some odd reason */
#include <stddef.h>
#include <stdbool.h>
#else
typedef unsigned int size_t;
typedef _Bool bool;
#endif /* __SPHINX_DOC */
/*
* These definitions are required for the code-generator. Please don't touch!
*/
#ifndef API
#define API(id, def) def
#endif
#ifndef API_ISR
#define API_ISR(id, isr) void isr(void);
#endif
/*
* IDs for all defined API calls. These IDs should not be needed in application
* code on any side.
*/
/* clang-format off */
#define API_SYSTEM_EXIT 0x1
#define API_SYSTEM_EXEC 0x2
#define API_INTERRUPT_ENABLE 0xA
#define API_INTERRUPT_DISABLE 0xB
#define API_UART_WRITE_STR 0x10
#define API_UART_READ_CHAR 0x11
#define API_UART_READ_STR 0x12
#define API_STREAM_READ 0x1F
#define API_DISP_OPEN 0x20
#define API_DISP_CLOSE 0x21
#define API_DISP_PRINT 0x22
#define API_DISP_CLEAR 0x23
#define API_DISP_UPDATE 0x24
#define API_DISP_LINE 0x25
#define API_DISP_RECT 0x26
#define API_DISP_CIRC 0x27
#define API_DISP_PIXEL 0x28
#define API_DISP_FRAMEBUFFER 0x29
#define API_FILE_OPEN 0x40
#define API_FILE_CLOSE 0x41
#define API_FILE_READ 0x42
#define API_FILE_WRITE 0x44
#define API_FILE_FLUSH 0x45
#define API_FILE_SEEK 0x46
#define API_FILE_TELL 0x47
#define API_FILE_STAT 0x48
#define API_RTC_GET_SECONDS 0x50
#define API_RTC_SCHEDULE_ALARM 0x51
#define API_LEDS_SET 0x60
#define API_LEDS_SET_HSV 0x61
#define API_LEDS_PREP 0x62
#define API_LEDS_PREP_HSV 0x63
#define API_LEDS_UPDATE 0x64
#define API_LEDS_SET_POWERSAVE 0x65
#define API_LEDS_SET_ROCKET 0x66
#define API_LEDS_SET_FLASHLIGHT 0x67
#define API_LEDS_DIM_TOP 0x68
#define API_LEDS_DIM_BOTTOM 0x69
#define API_LEDS_SET_ALL 0x6a
#define API_LEDS_SET_ALL_HSV 0x6b
#define API_LEDS_SET_GAMMA_TABLE 0x6c
#define API_VIBRA_SET 0x70
#define API_VIBRA_VIBRATE 0x71
#define API_LIGHT_SENSOR_RUN 0x80
#define API_LIGHT_SENSOR_GET 0x81
#define API_LIGHT_SENSOR_STOP 0x82
/* clang-format on */
typedef uint32_t api_int_id_t;
/**
* Interrupts
* ==========
* Next to API calls, Epicardium API also has an interrupt mechanism to serve
* the other direction. These interrupts can be enabled/disabled
* (masked/unmasked) using :c:func:`epic_interrupt_enable` and
* :c:func:`epic_interrupt_disable`.
*/
/**
* Enable/unmask an API interrupt.
*
* :param int_id: The interrupt to be enabled
*/
API(API_INTERRUPT_ENABLE, int epic_interrupt_enable(api_int_id_t int_id));
/**
* Disable/mask an API interrupt.
*
* :param int_id: The interrupt to be disabled
*/
API(API_INTERRUPT_DISABLE, int epic_interrupt_disable(api_int_id_t int_id));
/**
* The following interrupts are defined:
*/
/* clang-format off */
/** Reset Handler */
#define EPIC_INT_RESET 0
/** ``^C`` interrupt. See :c:func:`epic_isr_ctrl_c` for details. */
#define EPIC_INT_CTRL_C 1
/** UART Receive interrupt. See :c:func:`epic_isr_uart_rx`. */
#define EPIC_INT_UART_RX 2
/** RTC Alarm interrupt. See :c:func:`epic_isr_rtc_alarm` */
#define EPIC_INT_RTC_ALARM 3
/* Number of defined interrupts. */
#define EPIC_INT_NUM 4
/* clang-format on */
/*
* "Reset Handler*. This isr is implemented by the API caller and is used to
* reset the core for loading a new payload.
*
* Just listed here for completeness. You don't need to implement this yourself.
*/
API_ISR(EPIC_INT_RESET, __epic_isr_reset);
/**
* Core API
* ========
* The following functions control execution of code on core 1.
*/
/**
* Stop execution of the current payload and return to the menu.
*
* :param int ret: Return code.
* :return: :c:func:`epic_exit` will never return.
*/
void epic_exit(int ret) __attribute__((noreturn));
/*
* The actual epic_exit() function is not an API call because it needs special
* behavior. The underlying call is __epic_exit() which returns. After calling
* this API function, epic_exit() will enter the reset handler.
*/
API(API_SYSTEM_EXIT, void __epic_exit(int ret));
/**
* Stop execution of the current payload and immediately start another payload.
*
* :param char* name: Name (path) of the new payload to start. This can either
* be:
*
* - A path to an ``.elf`` file (l0dable).
* - A path to a ``.py`` file (will be loaded using Pycardium).
* - A path to a directory (assumed to be a Python module, execution starts
* with ``__init__.py`` in this folder).
*
* :return: :c:func:`epic_exec` will only return in case loading went wrong.
* The following error codes can be returned:
*
* - ``-ENOENT``: File not found.
* - ``-ENOEXEC``: File not a loadable format.
*/
int epic_exec(char *name);
/*
* Underlying API call for epic_exec(). The function is not an API call itself
* because it needs special behavior when loading a new payload.
*/
API(API_SYSTEM_EXEC, int __epic_exec(char *name));
/**
* UART/Serial Interface
* =====================
*/
/**
* Write a string to all connected serial devices. This includes:
*
* - Real UART, whose pins are mapped onto USB-C pins. Accessible via the HW-debugger.
* - A CDC-ACM device available via USB.
* - Maybe, in the future, bluetooth serial?
*
* :param str: String to write. Does not necessarily have to be NULL-terminated.
* :param length: Amount of bytes to print.
*/
API(API_UART_WRITE_STR, void epic_uart_write_str(
const char *str,
intptr_t length
));
/**
* Try reading a single character from any connected serial device.
*
* If nothing is available, :c:func:`epic_uart_read_char` returns ``(-1)``.
*
* :return: The byte or ``(-1)`` if no byte was available.
*/
API(API_UART_READ_CHAR, int epic_uart_read_char(void));
/**
* Read as many characters as possible from the UART queue.
*
* :c:func:`epic_uart_read_str` will not block if no new data is available. For
* an example, see :c:func:`epic_isr_uart_rx`.
*
* :param char* buf: Buffer to be filled with incoming data.
* :param size_t cnt: Size of ``buf``.
* :returns: Number of bytes read. Can be ``0`` if no data was available.
* Might be a negative value if an error occured.
*/
API(API_UART_READ_STR, int epic_uart_read_str(char *buf, size_t cnt));
/**
* **Interrupt Service Routine**
*
* UART receive interrupt. This interrupt is triggered whenever a new character
* becomes available on any connected UART device. This function is weakly
* aliased to :c:func:`epic_isr_default` by default.
*
* **Example**:
*
* .. code-block:: cpp
*
* void epic_isr_uart_rx(void)
* {
* char buffer[33];
* int n = epic_uart_read_str(&buffer, sizeof(buffer) - 1);
* buffer[n] = '\0';
* printf("Got: %s\n", buffer);
* }
*
* int main(void)
* {
* epic_interrupt_enable(EPIC_INT_UART_RX);
*
* while (1) {
* __WFI();
* }
* }
*/
API_ISR(EPIC_INT_UART_RX, epic_isr_uart_rx);
/**
* **Interrupt Service Routine**
*
* A user-defineable ISR which is triggered when a ``^C`` (``0x04``) is received
* on any serial input device. This function is weakly aliased to
* :c:func:`epic_isr_default` by default.
*
* To enable this interrupt, you need to enable :c:data:`EPIC_INT_CTRL_C`:
*
* .. code-block:: cpp
*
* epic_interrupt_enable(EPIC_INT_CTRL_C);
*/
API_ISR(EPIC_INT_CTRL_C, epic_isr_ctrl_c);
/**
* LEDs
* ====
*/
/**
* Set one of card10's RGB LEDs to a certain color in RGB format.
*
* This function is rather slow when setting multiple LEDs, use
* :c:func:`leds_set_all` or :c:func:`leds_prep` + :c:func:`leds_update`
* instead.
*
* :param int led: Which LED to set. 0-10 are the LEDs on the top and 11-14
* are the 4 "ambient" LEDs.
* :param uint8_t r: Red component of the color.
* :param uint8_t g: Green component of the color.
* :param uint8_t b: Blue component of the color.
*/
API(API_LEDS_SET, void epic_leds_set(int led, uint8_t r, uint8_t g, uint8_t b));
/**
* Set one of card10's RGB LEDs to a certain color in HSV format.
*
* This function is rather slow when setting multiple LEDs, use
* :c:func:`leds_set_all_hsv` or :c:func:`leds_prep_hsv` + :c:func:`leds_update`
* instead.
*
* :param int led: Which LED to set. 0-10 are the LEDs on the top and 11-14 are the 4 "ambient" LEDs.
* :param float h: Hue component of the color. (0 <= h < 360)
* :param float s: Saturation component of the color. (0 <= s <= 1)
* :param float v: Value/Brightness component of the color. (0 <= v <= 0)
*/
API(API_LEDS_SET_HSV, void epic_leds_set_hsv(int led, float h, float s, float v));
/**
* Set multiple of card10's RGB LEDs to a certain color in RGB format.
*
* The first ``len`` leds are set, the remaining ones are not modified.
*
* :param uint8_t[len][r,g,b] pattern: Array with RGB Values with 0 <= len <=
* 15. 0-10 are the LEDs on the top and 11-14 are the 4 "ambient" LEDs.
* :param uint8_t len: Length of 1st dimension of ``pattern``, see above.
*/
API(API_LEDS_SET_ALL, void epic_leds_set_all(uint8_t *pattern, uint8_t len));
/**
* Set multiple of card10's RGB LEDs to a certain color in HSV format.
*
* The first ``len`` led are set, the remaining ones are not modified.
*
* :param uint8_t[len][h,s,v] pattern: Array of format with HSV Values with 0
* <= len <= 15. 0-10 are the LEDs on the top and 11-14 are the 4 "ambient"
* LEDs. (0 <= h < 360, 0 <= s <= 1, 0 <= v <= 1)
* :param uint8_t len: Length of 1st dimension of ``pattern``, see above.
*/
API(API_LEDS_SET_ALL_HSV, void epic_leds_set_all_hsv(float *pattern, uint8_t len));
/**
* Prepare one of card10's RGB LEDs to be set to a certain color in RGB format.
*
* Use :c:func:`leds_update` to apply changes.
*
* :param int led: Which LED to set. 0-10 are the LEDs on the top and 11-14
* are the 4 "ambient" LEDs.
* :param uint8_t r: Red component of the color.
* :param uint8_t g: Green component of the color.
* :param uint8_t b: Blue component of the color.
*/
API(API_LEDS_PREP, void epic_leds_prep(int led, uint8_t r, uint8_t g, uint8_t b));
/**
* Prepare one of card10's RGB LEDs to be set to a certain color in HSV format.
*
* Use :c:func:`leds_update` to apply changes.
*
* :param int led: Which LED to set. 0-10 are the LEDs on the top and 11-14
* are the 4 "ambient" LEDs.
* :param uint8_t h: Hue component of the color. (float, 0 <= h < 360)
* :param uint8_t s: Saturation component of the color. (float, 0 <= s <= 1)
* :param uint8_t v: Value/Brightness component of the color. (float, 0 <= v <= 0)
*/
API(API_LEDS_PREP_HSV, void epic_leds_prep_hsv(int led, float h, float s, float v));
/**
* Set global brightness for top RGB LEDs.
*
* Aside from PWM, the RGB LEDs' overall brightness can be controlled with a
* current limiter independently to achieve a higher resolution at low
* brightness which can be set with this function.
*
* :param uint8_t value: Global brightness of top LEDs. (1 <= value <= 8, default = 1)
*/
API(API_LEDS_DIM_BOTTOM, void epic_leds_dim_bottom(uint8_t value));
/**
* Set global brightness for bottom RGB LEDs.
*
* Aside from PWM, the RGB LEDs' overall brightness can be controlled with a
* current limiter independently to achieve a higher resolution at low
* brightness which can be set with this function.
*
* :param uint8_t value: Global brightness of bottom LEDs. (1 <= value <= 8, default = 8)
*/
API(API_LEDS_DIM_TOP, void epic_leds_dim_top(uint8_t value));
/**
* Enables or disables powersave mode.
*
* Even when set to zero, the RGB LEDs still individually consume ~1mA.
* Powersave intelligently switches the supply power in groups. This introduces
* delays in the magnitude of ~10µs, so it can be disabled for high speed
* applications such as POV.
*
* :param bool eco: Activates powersave if true, disables it when false. (default = True)
*/
API(API_LEDS_SET_POWERSAVE, void epic_leds_set_powersave(bool eco));
/**
* Updates the RGB LEDs with changes that have been set with :c:func:`leds_prep`
* or :c:func:`leds_prep_hsv`.
*
* The LEDs can be only updated in bulk, so using this approach instead of
* :c:func:`leds_set` or :c:func:`leds_set_hsv` significantly reduces the load
* on the corresponding hardware bus.
*/
API(API_LEDS_UPDATE, void epic_leds_update(void));
/**
* Set the brightness of one of the rocket LEDs.
*
* :param int led: Which LED to set.
*
* +-------+--------+----------+
* | ID | Color | Location |
* +=======+========+==========+
* | ``0`` | Blue | Left |
* +-------+--------+----------+
* | ``1`` | Yellow | Top |
* +-------+--------+----------+
* | ``2`` | Green | Right |
* +-------+--------+----------+
* :param uint8_t value: Brightness of LED (only two brightness levels are
* supported right now).
*/
API(API_LEDS_SET_ROCKET, void epic_leds_set_rocket(int led, uint8_t value));
/**
* Turn on the bright side LED which can serve as a flashlight if worn on the left wrist or as a rad tattoo illuminator if worn on the right wrist.
*
*:param bool power: Side LED on if true.
*/
API(API_LEDS_SET_FLASHLIGHT, void epic_set_flashlight(bool power));
/**
* Set gamma lookup table for individual rgb channels.
*
* Since the RGB LEDs' subcolor LEDs have different peak brightness and the
* linear scaling introduced by PWM is not desireable for color accurate work,
* custom lookup tables for each individual color channel can be loaded into the
* Epicardium's memory with this function.
*
* :param uint8_t rgb_channel: Color whose gamma table is to be updated, 0->Red, 1->Green, 2->Blue.
* :param uint8_t[256] gamma_table: Gamma lookup table. (default = 4th order power function rounded up)
*/
API(API_LEDS_SET_GAMMA_TABLE, void epic_leds_set_gamma_table(
uint8_t rgb_channel,
uint8_t *gamma_table
));
/**
* Sensor Data Streams
* ===================
* A few of card10's sensors can do continuous measurements. To allow
* performant access to their data, the following function is made for generic
* access to streams.
*/
/**
* Read sensor data into a buffer. ``epic_stream_read()`` will read as many
* sensor samples into the provided buffer as possible and return the number of
* samples written. If no samples are available, ``epic_stream_read()`` will
* return ``0`` immediately.
*
* ``epic_stream_read()`` expects the provided buffer to have a size which is a
* multiple of the sample size for the given stream. For the sample-format and
* size, please consult the sensors documentation.
*
* Before reading the internal sensor sample queue, ``epic_stream_read()`` will
* call a sensor specific *poll* function to allow the sensor driver to fetch
* new samples from its hardware. This should, however, never take a long
* amount of time.
*
* :param int sd: Sensor Descriptor. You get sensor descriptors as return
* values when activating the respective sensors.
* :param void* buf: Buffer where sensor data should be read into.
* :param size_t count: How many bytes to read at max. Note that fewer bytes
* might be read. In most cases, this should be ``sizeof(buf)``.
* :return: Number of data packets read (**not** number of bytes) or a negative
* error value. Possible errors:
*
* - ``-ENODEV``: Sensor is not currently available.
* - ``-EBADF``: The given sensor descriptor is unknown.
* - ``-EINVAL``: ``count`` is not a multiple of the sensor's sample size.
* - ``-EBUSY``: The descriptor table lock could not be acquired.
*
* **Example**:
*
* .. code-block:: cpp
*
* #include "epicardium.h"
*
* struct foo_measurement sensor_data[16];
* int foo_sd, n;
*
* foo_sd = epic_foo_sensor_enable(9001);
*
* while (1) {
* n = epic_stream_read(
* foo_sd,
* &sensor_data,
* sizeof(sensor_data)
* );
*
* // Print out the measured sensor samples
* for (int i = 0; i < n; i++) {
* printf("Measured: %?\n", sensor_data[i]);
* }
* }
*/
API(API_STREAM_READ, int epic_stream_read(int sd, void *buf, size_t count));
/**
* Vibration Motor
* ===============
*/
/**
* Turn vibration motor on or off
*
* :param status: 1 to turn on, 0 to turn off.
*/
API(API_VIBRA_SET, void epic_vibra_set(int status));
/**
* Turn vibration motor on for a given time
*
* :param millis: number of milliseconds to run the vibration motor.
*/
API(API_VIBRA_VIBRATE, void epic_vibra_vibrate(int millis));
/**
* Display
* =======
* The card10 has an LCD screen that can be accessed from user code.
*
* There are two ways to access the display:
*
* - *immediate mode*, where you ask Epicardium to draw shapes and text for
* you. Most functions in this subsection are related to *immediate mode*.
* - *framebuffer mode*, where you provide Epicardium with a memory range where
* you already drew graphics whichever way you wanted and Epicardium will
* copy them to the display. To use *framebuffer mode*, use the
* :c:func:`epic_disp_framebuffer` function.
*/
/** Line-Style */
enum disp_linestyle {
/** */
LINESTYLE_FULL = 0,
/** */
LINESTYLE_DOTTED = 1
};
/** Fill-Style */
enum disp_fillstyle {
/** */
FILLSTYLE_EMPTY = 0,
/** */
FILLSTYLE_FILLED = 1
};
/** Width of display in pixels */
#define DISP_WIDTH 160
/** Height of display in pixels */
#define DISP_HEIGHT 80
/**
* Framebuffer
*
* The frambuffer stores pixels as RGB565, but byte swapped. That is, for every ``(x, y)`` coordinate, there are two ``uint8_t``\ s storing 16 bits of pixel data.
*
* .. todo::
*
* Document (x, y) in relation to chirality.
*
* **Example**: Fill framebuffer with red
*
* .. code-block:: cpp
*
* union disp_framebuffer fb;
* uint16_t red = 0b1111100000000000;
* for (int y = 0; y < DISP_HEIGHT; y++) {
* for (int x = 0; x < DISP_WIDTH; x++) {
* fb.fb[y][x][0] = red >> 8;
* fb.fb[y][x][1] = red & 0xFF;
* }
* }
* epic_disp_framebuffer(&fb);
*/
union disp_framebuffer {
/** Coordinate based access (as shown in the example above). */
uint8_t fb[DISP_HEIGHT][DISP_WIDTH][2];
/** Raw byte-indexed access. */
uint8_t raw[DISP_HEIGHT*DISP_WIDTH*2];
};
/**
* Locks the display.
*
* :return: ``0`` on success or a negative value in case of an error:
*
* - ``-EBUSY``: Display was already locked from another task.
*/
API(API_DISP_OPEN, int epic_disp_open());
/**
* Unlocks the display again.
*
* :return: ``0`` on success or a negative value in case of an error:
*
* - ``-EBUSY``: Display was already locked from another task.
*/
API(API_DISP_CLOSE, int epic_disp_close());
/**
* Causes the changes that have been written to the framebuffer
* to be shown on the display
* :return: ``0`` on success or a negative value in case of an error:
*
* - ``-EBUSY``: Display was already locked from another task.
*/
API(API_DISP_UPDATE, int epic_disp_update());
/**
* Prints a string into the display framebuffer
*
* :param posx: x position to print to. 0 <= x <= 160
* :param posy: y position to print to. 0 <= y <= 80
* :param pString: string to print
* :param fg: foreground color in rgb565
* :param bg: background color in rgb565
* :return: ``0`` on success or a negative value in case of an error:
*
* - ``-EBUSY``: Display was already locked from another task.
*/
API(API_DISP_PRINT,
int epic_disp_print(
uint16_t posx,
uint16_t posy,
const char *pString,
uint16_t fg,
uint16_t bg)
);
/**
* Fills the whole screen with one color
*
* :param color: fill color in rgb565
* :return: ``0`` on success or a negative value in case of an error:
*
* - ``-EBUSY``: Display was already locked from another task.
*/
API(API_DISP_CLEAR, int epic_disp_clear(uint16_t color));
/**
* Draws a pixel on the display
*
* :param x: x position; 0 <= x <= 160
* :param y: y position; 0 <= y <= 80
* :param color: pixel color in rgb565
* :return: ``0`` on success or a negative value in case of an error:
*
* - ``-EBUSY``: Display was already locked from another task.
*/
API(API_DISP_PIXEL,
int epic_disp_pixel(
uint16_t x,
uint16_t y,
uint16_t color)
);
/**
* Draws a line on the display
*
* :param xstart: x starting position; 0 <= x <= 160
* :param ystart: y starting position; 0 <= y <= 80
* :param xend: x ending position; 0 <= x <= 160
* :param yend: y ending position; 0 <= y <= 80
* :param color: line color in rgb565
* :param linestyle: 0 for solid, 1 for dottet (almost no visual difference)
* :param pixelsize: thickness of the line; 1 <= pixelsize <= 8
* :return: ``0`` on success or a negative value in case of an error:
*
* - ``-EBUSY``: Display was already locked from another task.
*/
API(API_DISP_LINE,
int epic_disp_line(
uint16_t xstart,
uint16_t ystart,
uint16_t xend,
uint16_t yend,
uint16_t color,
enum disp_linestyle linestyle,
uint16_t pixelsize)
);
/**
* Draws a rectangle on the display
*
* :param xstart: x coordinate of top left corner; 0 <= x <= 160
* :param ystart: y coordinate of top left corner; 0 <= y <= 80
* :param xend: x coordinate of bottom right corner; 0 <= x <= 160
* :param yend: y coordinate of bottom right corner; 0 <= y <= 80
* :param color: line color in rgb565
* :param fillstyle: 0 for empty, 1 for filled
* :param pixelsize: thickness of the rectangle outline; 1 <= pixelsize <= 8
* :return: ``0`` on success or a negative value in case of an error:
*
* - ``-EBUSY``: Display was already locked from another task.
*/
API(API_DISP_RECT,
int epic_disp_rect(
uint16_t xstart,
uint16_t ystart,
uint16_t xend,
uint16_t yend,
uint16_t color,
enum disp_fillstyle fillstyle,
uint16_t pixelsize)
);
/**
* Draws a circle on the display
*
* :param x: x coordinate of the center; 0 <= x <= 160
* :param y: y coordinate of the center; 0 <= y <= 80
* :param rad: radius of the circle
* :param color: fill and outline color of the circle (rgb565)
* :param fillstyle: 0 for empty, 1 for filled
* :param pixelsize: thickness of the circle outline; 1 <= pixelsize <= 8
* :return: ``0`` on success or a negative value in case of an error:
*
* - ``-EBUSY``: Display was already locked from another task.
*/
API(API_DISP_CIRC,
int epic_disp_circ(
uint16_t x,
uint16_t y,
uint16_t rad,
uint16_t color,
enum disp_fillstyle fillstyle,
uint16_t pixelsize)
);
/**
* Immediately send the contents of a framebuffer to the display. This overrides
* anything drawn by immediate mode graphics and displayed using ``epic_disp_update``.
*
* :param fb: framebuffer to display
* :return: ``0`` on success or negative value in case of an error:
*
* - ``-EBUSY``: Display was already locked from another task.
*/
API(API_DISP_FRAMEBUFFER, int epic_disp_framebuffer(union disp_framebuffer *fb));
/**
* Start continuous readout of the light sensor. Will read light level
* at preconfigured interval and make it available via `epic_light_sensor_get()`.
*
* If the continuous readout was already running, this function will silently pass.
*
*
* :return: `0` if the start was successful or a negative error value
* if an error occured. Possible errors:
*
* - ``-EBUSY``: The timer could not be scheduled.
*/
API(API_LIGHT_SENSOR_RUN, int epic_light_sensor_run());
/**
* Get the last light level measured by the continuous readout.
*
* :param uint16_t* value: where the last light level should be written.
* :return: `0` if the readout was successful or a negative error
* value. Possible errors:
*
* - ``-ENODATA``: Continuous readout not currently running.
*/
API(API_LIGHT_SENSOR_GET, int epic_light_sensor_get(uint16_t* value));
/**
* Stop continuous readout of the light sensor.
*
* If the continuous readout wasn't running, this function will silently pass.
*
* :return: `0` if the stop was sucessful or a negative error value
* if an error occured. Possible errors:
*
* - ``-EBUSY``: The timer stop could not be scheduled.
*/
API(API_LIGHT_SENSOR_STOP, int epic_light_sensor_stop());
/**
* File
* ====
* Except for :c:func:`epic_file_open`, which models C stdio's ``fopen``
* function, ``close``, ``read`` and ``write`` model `close(2)`_, `read(2)`_ and
* `write(2)`_. All file-related functions return >= ``0`` on success and
* ``-Exyz`` on failure, with error codes from errno.h (``EIO``, ``EINVAL``
* etc.)
*
* .. _close(2): http://man7.org/linux/man-pages/man2/close.2.html
* .. _read(2): http://man7.org/linux/man-pages/man2/read.2.html
* .. _write(2): http://man7.org/linux/man-pages/man2/write.2.html
*/
/** */
API(
API_FILE_OPEN,
int epic_file_open(const char* filename, const char* modeString)
);
/** */
API(API_FILE_CLOSE, int epic_file_close(int fd));
/** */
API(API_FILE_READ, int epic_file_read(int fd, void* buf, size_t nbytes));
/** */
API(
API_FILE_WRITE,
int epic_file_write(int fd, const void* buf, size_t nbytes)
);
/** */
API(API_FILE_FLUSH, int epic_file_flush(int fd));
/** */
API(API_FILE_SEEK, int epic_file_seek(int fd, long offset, int whence));
/** */
API(API_FILE_TELL, int epic_file_tell(int fd));
/** */
enum epic_stat_type {
/**
* Basically ``ENOENT``. Although :c:func:`epic_file_stat` returns an
* error for 'none', the type will still be set to none additionally.
*
* This is also used internally to track open FS objects, where we use
* ``EPICSTAT_NONE`` to mark free objects.
*/
EPICSTAT_NONE,
/** normal file */
EPICSTAT_FILE,
/** directory */
EPICSTAT_DIR,
};
/** */
struct epic_stat {
/** Entity Type: file, directory or none */
enum epic_stat_type type;
/*
* Note about padding & placement of uint32_t size:
*
* To accomodate for future expansion, we want padding at the end of
* this struct. Since sizeof(enum epic_stat_type) can not be assumed
* to be have a certain size, we're placing uint32_t size here so we
* can be sure it will be at offset 4, and therefore the layout of the
* other fields is predictable.
*/
/** Size in bytes. */
uint32_t size;
/**
* Which FAT volume this entity resides on.
*
* (will be needed later once we distinguish between system and user volume)
*/
uint8_t volume;
uint8_t _reserved[9];
};
#ifndef __cplusplus
#if defined(__GNUC__) && ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6))
_Static_assert(sizeof(struct epic_stat) == 20, "");
#endif
#endif
/**
* stat path
*
* :param char* filename: path to stat
* :param epic_stat* stat: pointer to result
*
* :return: ``0`` on success, negative on error
*/
API(API_FILE_STAT, int epic_file_stat(
const char* path, struct epic_stat* stat
));
/**
* RTC
* ===
*/
/**
* Read the current RTC value.
*
* :return: Unix time in seconds
*/
API(API_RTC_GET_SECONDS, uint32_t epic_rtc_get_seconds(void));
/**
* Schedule the RTC alarm for the given timestamp.
*
* :param uint32_t timestamp: When to schedule the IRQ
* :return: `0` on success or a negative value if an error occured. Possible
* errors:
*
* - ``-EINVAL``: RTC is in a bad state
*/
API(API_RTC_SCHEDULE_ALARM, int epic_rtc_schedule_alarm(uint32_t timestamp));
/**
* **Interrupt Service Routine**
*
* ``epic_isr_rtc_alarm()`` is called when the RTC alarm triggers. The RTC alarm
* can be scheduled using :c:func:`epic_rtc_schedule_alarm`.
*/
API_ISR(EPIC_INT_RTC_ALARM, epic_isr_rtc_alarm);
#endif /* _EPICARDIUM_H */