flipperzero-firmware/applications/display-u8g2/display-u8g2.c

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#include "u8g2/u8g2.h"
#include "flipper.h"
extern SPI_HandleTypeDef hspi1;
// TODO: fix log
#ifdef DEBUG
#undef DEBUG
#endif
// TODO rewrite u8g2 to pass thread-local context in this handlers
static uint8_t
u8g2_gpio_and_delay_stm32(u8x8_t* u8x8, uint8_t msg, uint8_t arg_int, void* arg_ptr) {
switch(msg) {
//Initialize SPI peripheral
case U8X8_MSG_GPIO_AND_DELAY_INIT:
/* HAL initialization contains all what we need so we can skip this part. */
break;
//Function which implements a delay, arg_int contains the amount of ms
case U8X8_MSG_DELAY_MILLI:
osDelay(arg_int);
break;
//Function which delays 10us
case U8X8_MSG_DELAY_10MICRO:
delay_us(10);
break;
//Function which delays 100ns
case U8X8_MSG_DELAY_100NANO:
asm("nop");
break;
// Function to define the logic level of the RESET line
case U8X8_MSG_GPIO_RESET:
#ifdef DEBUG
fuprintf(log, "[u8g2] rst %d\n", arg_int);
#endif
// TODO change it to FuriRecord pin
HAL_GPIO_WritePin(
DISPLAY_RST_GPIO_Port, DISPLAY_RST_Pin, arg_int ? GPIO_PIN_SET : GPIO_PIN_RESET);
break;
default:
#ifdef DEBUG
fufuprintf(log, "[u8g2] unknown io %d\n", msg);
#endif
return 0; //A message was received which is not implemented, return 0 to indicate an error
}
return 1; // command processed successfully.
}
static uint8_t u8x8_hw_spi_stm32(u8x8_t* u8x8, uint8_t msg, uint8_t arg_int, void* arg_ptr) {
switch(msg) {
case U8X8_MSG_BYTE_SEND:
#ifdef DEBUG
fuprintf(log, "[u8g2] send %d bytes %02X\n", arg_int, ((uint8_t*)arg_ptr)[0]);
#endif
// TODO change it to FuriRecord SPI
HAL_SPI_Transmit(&hspi1, (uint8_t*)arg_ptr, arg_int, 10000);
break;
case U8X8_MSG_BYTE_SET_DC:
#ifdef DEBUG
fuprintf(log, "[u8g2] dc %d\n", arg_int);
#endif
// TODO change it to FuriRecord pin
HAL_GPIO_WritePin(
DISPLAY_DI_GPIO_Port, DISPLAY_DI_Pin, arg_int ? GPIO_PIN_SET : GPIO_PIN_RESET);
break;
case U8X8_MSG_BYTE_INIT:
#ifdef DEBUG
fuprintf(log, "[u8g2] init\n");
#endif
// TODO change it to FuriRecord pin
HAL_GPIO_WritePin(DISPLAY_CS_GPIO_Port, DISPLAY_CS_Pin, GPIO_PIN_RESET);
break;
case U8X8_MSG_BYTE_START_TRANSFER:
#ifdef DEBUG
fuprintf(log, "[u8g2] start\n");
#endif
// TODO change it to FuriRecord pin
HAL_GPIO_WritePin(DISPLAY_CS_GPIO_Port, DISPLAY_CS_Pin, GPIO_PIN_RESET);
asm("nop");
break;
case U8X8_MSG_BYTE_END_TRANSFER:
#ifdef DEBUG
fuprintf(log, "[u8g2] end\n");
#endif
asm("nop");
// TODO change it to FuriRecord pin
HAL_GPIO_WritePin(DISPLAY_CS_GPIO_Port, DISPLAY_CS_Pin, GPIO_PIN_SET);
break;
default:
#ifdef DEBUG
fuprintf(log, "[u8g2] unknown xfer %d\n", msg);
#endif
return 0;
}
return 1;
}
typedef struct {
SemaphoreHandle_t update; // queue to pass events from callback to app thread
FuriRecordSubscriber* log; // app logger
} DisplayCtx;
static void handle_fb_change(const void* fb, size_t fb_size, void* raw_ctx) {
DisplayCtx* ctx = (DisplayCtx*)raw_ctx; // make right type
fuprintf(ctx->log, "[display_u8g2] change fb\n");
// send update to app thread
xSemaphoreGive(ctx->update);
}
void display_u8g2(void* p) {
FuriRecordSubscriber* log = get_default_log();
// TODO we need different app to contol backlight
HAL_GPIO_WritePin(DISPLAY_BACKLIGHT_GPIO_Port, DISPLAY_BACKLIGHT_Pin, GPIO_PIN_SET);
u8g2_t _u8g2;
u8g2_Setup_st7565_erc12864_alt_f(
&_u8g2, U8G2_R0, u8x8_hw_spi_stm32, u8g2_gpio_and_delay_stm32);
u8g2_InitDisplay(
&_u8g2); // send init sequence to the display, display is in sleep mode after this
u8g2_SetContrast(&_u8g2, 36);
if(!furi_create("u8g2_fb", (void*)&_u8g2, sizeof(_u8g2))) {
fuprintf(log, "[display_u8g2] cannot create fb record\n");
furiac_exit(NULL);
}
StaticSemaphore_t event_descriptor;
// create stack-based counting semaphore
SemaphoreHandle_t update = xSemaphoreCreateCountingStatic(255, 0, &event_descriptor);
if(update == NULL) {
fuprintf(log, "[display_u8g2] cannot create update semaphore\n");
furiac_exit(NULL);
}
// save log and event queue in context structure
DisplayCtx ctx = {.update = update, .log = log};
// subscribe to record. ctx will be passed to handle_fb_change
FuriRecordSubscriber* fb_record =
furi_open("u8g2_fb", false, false, handle_fb_change, NULL, &ctx);
if(fb_record == NULL) {
fuprintf(log, "[display] cannot open fb record\n");
furiac_exit(NULL);
}
u8g2_t* u8g2 = (u8g2_t*)furi_take(fb_record);
u8g2_SetPowerSave(u8g2, 0); // wake up display
u8g2_SendBuffer(u8g2);
furi_give(fb_record);
// we ready to work
furiac_ready();
while(1) {
// wait for event
if(xSemaphoreTake(update, 10000) == pdTRUE) {
HAL_GPIO_WritePin(DISPLAY_BACKLIGHT_GPIO_Port, DISPLAY_BACKLIGHT_Pin, GPIO_PIN_SET);
u8g2_t* u8g2 = (u8g2_t*)furi_take(fb_record);
u8g2_SetPowerSave(u8g2, 0); // wake up display
u8g2_SendBuffer(u8g2);
furi_give(fb_record);
} else {
// TODO we need different app to contol backlight
HAL_GPIO_WritePin(DISPLAY_BACKLIGHT_GPIO_Port, DISPLAY_BACKLIGHT_Pin, GPIO_PIN_RESET);
}
}
}