Multiple displays using threads
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servadmin
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e0f5bc1af3
commit
289a9a1e34
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@ -1376,6 +1376,11 @@ void u8g2_SetBufferCurrTileRow(u8g2_t *u8g2, uint8_t row) U8G2_NOINLINE;
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void u8g2_FirstPage(u8g2_t *u8g2);
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uint8_t u8g2_NextPage(u8g2_t *u8g2);
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// Add ability to set buffer pointer
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#if defined(__ARM_LINUX__) || defined(unix) || defined(__unix__) || defined(__unix)
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#define U8G2_USE_DYNAMIC_ALLOC
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#endif
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#ifdef U8G2_USE_DYNAMIC_ALLOC
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#define u8g2_SetBufferPtr(u8g2, buf) ((u8g2)->tile_buf_ptr = (buf));
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#define u8g2_GetBufferSize(u8g2) ((u8g2)->u8x8.display_info->tile_width * 8 * (u8g2)->tile_buf_height)
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@ -0,0 +1,61 @@
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# Chosse proper compiler for your PI
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# NanoPi: arm-linux-gnueabi-gcc
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# Raspberry Pi Zero: arm-linux-gnueabi-gcc
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# Raspberry Pi 2: arm-linux-gnueabihf-gcc
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# OrangePi Zero: arm-linux-gnueabihf-gcc
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# NanoPi NEO: arm-linux-gnueabihf-gcc
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# NanoPi NEO Plus 2: arm-linux-gnueabihf-gcc
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# C-SKY Linux: csky-linux-gcc
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CC=arm-linux-gnueabi-gcc
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# IP Address of your PI
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PI=pi@raspberrypi.local
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TARGET=u8g2_sw_i2c_thread
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IDIR= -I ../../../drivers -I ../../../../../csrc -I ../../../port
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SRCDIR=../../../../../csrc
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OBJDIR=../../../obj
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OUTDIR=../../../bin
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LDIR= -L ../../../lib
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LIBS= -lm -lpthread
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CFLAGS= $(IDIR) -W -Wall -D __ARM_LINUX__
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OBJ+=u8g2_sw_i2c_thread.o\
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../../../port/u8g2port.o\
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../../../drivers/gpio.o\
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../../../drivers/spi.o\
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../../../drivers/i2c.o\
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OBJ+=$(patsubst $(SRCDIR)/%.c,$(OBJDIR)/%.o, $(wildcard $(SRCDIR)/*.c))
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all: directories $(TARGET)
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directories:
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@mkdir -p $(OBJDIR)
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@mkdir -p $(OUTDIR)
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$(TARGET):$(OBJ)
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@echo Generating $(TARGET) ...
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@$(CC) -o $(OUTDIR)/$@ $(OBJ) $(LDIR) $(LIBS)
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$(OBJDIR)/%.o: $(SRCDIR)/%.c
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$(CC) -c -o $@ $< $(CFLAGS) $(LDIR) $(LIBS)
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clean:
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@echo RM -rf $(OBJDIR)/
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@rm -rf $(OBJ)
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@rm -rf $(OBJDIR)
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@echo RM -rf $(OUTDIR)/
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@rm -rf $(OUTDIR)
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upload:
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scp $(OUTDIR)/$(TARGET) $(PI):~/
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run:
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ssh $(PI)
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@ -0,0 +1,86 @@
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/*
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* Run three displays drawing random lines. This proves you can use U8g2 to run
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* multiple displays in a thread safe way.
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*/
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#include "u8g2port.h"
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#include <pthread.h>
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#include <string.h>
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#include <errno.h>
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// Encapsulate each thread's info
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struct display {
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uint8_t gpio_chip;
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uint8_t scl;
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uint8_t sda;
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uint8_t res;
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unsigned long delay;
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};
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typedef struct display display_t;
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/*
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* Draw random lines with 50 ms delay.
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*/
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void* do_display(void *arg) {
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display_t disp = *((display_t*) arg);
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pthread_t id = pthread_self();
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uint8_t h, w, y1, y2;
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uint8_t *buf;
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printf("Thread %lu start\n", id);
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u8g2_t u8g2;
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// Initialization
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u8g2_Setup_ssd1306_i2c_128x32_univision_f(&u8g2, U8G2_R0, u8x8_byte_sw_i2c,
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u8x8_arm_linux_gpio_and_delay);
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// We need unique buffer for each display in order to be thread friendly
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buf = (uint8_t*)malloc(u8g2_GetBufferSize(&u8g2));
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u8g2_SetBufferPtr(&u8g2, buf);
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init_i2c_sw(&u8g2, disp.gpio_chip, disp.scl, disp.sda, disp.res,
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disp.delay);
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u8g2_InitDisplay(&u8g2);
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h = u8g2_GetDisplayHeight(&u8g2);
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w = u8g2_GetDisplayWidth(&u8g2);
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u8g2_SetPowerSave(&u8g2, 0);
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u8g2_SetFont(&u8g2, u8g2_font_ncenB08_tr);
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for (int i = 1; i < 200; ++i) {
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u8g2_ClearBuffer(&u8g2);
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y1 = rand() % h;
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y2 = rand() % h;
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u8g2_DrawLine(&u8g2, 0, y1, w - 1, y2);
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u8g2_SendBuffer(&u8g2);
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sleep_ms(50);
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}
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u8g2_SetPowerSave(&u8g2, 1);
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// Close and deallocate GPIO resources
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done_user_data(&u8g2);
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free(buf);
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printf("Thread %lu end\n", id);
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return NULL;
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}
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int main(void) {
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pthread_t id_1;
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pthread_t id_2;
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pthread_t id_3;
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void *retval_1;
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void *retval_2;
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void *retval_3;
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display_t display_1 = { 0, 14, 13, U8X8_PIN_NONE, 0 };
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display_t display_2 = { 0, 15, 16, U8X8_PIN_NONE, 0 };
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display_t display_3 = { 0, 198, 199, U8X8_PIN_NONE, 0 };
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pthread_create(&id_1, NULL, &do_display, &display_1);
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pthread_create(&id_2, NULL, &do_display, &display_2);
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pthread_create(&id_3, NULL, &do_display, &display_3);
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pthread_join(id_1, (void**) &retval_1);
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pthread_join(id_2, (void**) &retval_2);
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pthread_join(id_3, (void**) &retval_3);
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printf("Done\n");
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return 0;
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}
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@ -1,7 +1,9 @@
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/*
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* This code should support multiple displays since GPIO pin handles have been
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* This code supports multiple displays since GPIO pin handles have been
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* moved into user_data_struct. I2C and SPI handles are global since they can be
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* shared by multiple devices (think I2C with different address sharing bus).
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*
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* So far I have tested this with 3 software I2C displays. See examples.
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*/
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#include "u8g2port.h"
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