raspi gpio example
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kraus
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915ac72b8a
commit
09b816d591
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/*
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raspi_gpio_hal.c
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This could needs to be compiled with -DU8X8_USE_PINS
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Code partly taken over from
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http://www.netzmafia.de/skripten/hardware/RasPi/RasPi_GPIO_C.html
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https://github.com/olikraus/u8g2/wiki/Porting-to-new-MCU-platform#template-for-the-gpio-and-delay-callback
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*/
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <time.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "u8x8.h"
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void delaynanoseconds(unsigned long ns)
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{
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struct timespec ts;
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ts.tv_sec = 0;
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ts.tv_nsec = ns;
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nanosleep(&ts, (struct timespec *)NULL);
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}
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int gpio_export(int pin)
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{
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char buffer[6];
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ssize_t bytes;
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int fd;
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fd = open("/sys/class/gpio/export", O_WRONLY);
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if (fd < 0)
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return perror("/sys/class/gpio/export"), 0;
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bytes = sprintf(buffer, "%d", pin);
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if (write(fd, buffer, bytes) < 0)
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return perror("write"), close(fd), 0;
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close(fd);
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return 1;
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}
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/* dir: 0=in, 1=out */
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int gpio_direction(int pin, int dir)
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{
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char path[256];
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int fd;
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int res;
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snprintf(path, 256, "/sys/class/gpio/gpio%d/direction", pin);
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fd = open(path, O_WRONLY);
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if (fd < 0)
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return perror(path), 0;
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switch (dir)
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{
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case 0 : res = write(fd,"in",2); break;
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case 1: res = write(fd,"out",3); break;
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default: return close(fd), 0;
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}
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if (res < 0)
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return perror("write"), close(fd), 0;
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close(fd);
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return 1;
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}
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int gpio_write(int pin, int value)
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{
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char path[256];
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int fd;
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int res;
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snprintf(path, 256, "/sys/class/gpio/gpio%d/value", pin);
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fd = open(path, O_WRONLY);
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if (fd < 0)
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return perror(path), 0;
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switch (value)
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{
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case 0 : res = write(fd,"0",1); break;
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default: res = write(fd,"1",1); break;
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}
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if (res < 0)
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return perror("write"), close(fd), 0;
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close(fd);
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return 1;
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}
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uint8_t u8x8_gpio_and_delay_raspi_gpio_hal(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
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{
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int i;
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switch(msg)
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{
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case U8X8_MSG_GPIO_I2C_CLOCK: // arg_int=0: Output low at I2C clock pin
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case U8X8_MSG_GPIO_I2C_DATA: // arg_int=0: Output low at I2C data pin
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case U8X8_MSG_GPIO_D0: // D0 or SPI clock pin: Output level in arg_int
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case U8X8_MSG_GPIO_D1: // D1 or SPI data pin: Output level in arg_int
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case U8X8_MSG_GPIO_D2: // D2 pin: Output level in arg_int
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case U8X8_MSG_GPIO_D3: // D3 pin: Output level in arg_int
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case U8X8_MSG_GPIO_D4: // D4 pin: Output level in arg_int
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case U8X8_MSG_GPIO_D5: // D5 pin: Output level in arg_int
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case U8X8_MSG_GPIO_D6: // D6 pin: Output level in arg_int
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case U8X8_MSG_GPIO_D7: // D7 pin: Output level in arg_int
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case U8X8_MSG_GPIO_E: // E/WR pin: Output level in arg_int
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case U8X8_MSG_GPIO_CS: // CS (chip select) pin: Output level in arg_int
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case U8X8_MSG_GPIO_DC: // DC (data/cmd, A0, register select) pin: Output level in arg_int
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case U8X8_MSG_GPIO_RESET: // Reset pin: Output level in arg_int
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case U8X8_MSG_GPIO_CS1: // CS1 (chip select) pin: Output level in arg_int
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case U8X8_MSG_GPIO_CS2: // CS2 (chip select) pin: Output level in arg_int
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gpio_write(u8x8_GetPinValue(u8x8, msg), arg_int);
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break;
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case U8X8_MSG_GPIO_AND_DELAY_INIT: // called once during init phase of u8g2/u8x8
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for( i = 0; i < U8X8_PIN_CNT; i++ )
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if ( u8x8->pins[i] != U8X8_PIN_NONE )
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{
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if ( i < U8X8_PIN_OUTPUT_CNT )
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{
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gpio_direction(u8x8->pins[i], 1);
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}
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else
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{
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// not supported at the moment
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//gpio_direction(u8x8->pins[i], 0);
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}
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}
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delaynanoseconds(100000);
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break; // can be used to setup pins
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case U8X8_MSG_DELAY_NANO: // delay arg_int * 1 nano second
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delaynanoseconds(arg_int);
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break;
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case U8X8_MSG_DELAY_100NANO: // delay arg_int * 100 nano seconds
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delaynanoseconds((unsigned long)arg_int*100UL);
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break;
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case U8X8_MSG_DELAY_10MICRO: // delay arg_int * 10 micro seconds
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delaynanoseconds((unsigned long)arg_int*10000UL);
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break;
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case U8X8_MSG_DELAY_MILLI: // delay arg_int * 1 milli second
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delaynanoseconds((unsigned long)arg_int*1000000UL);
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break;
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case U8X8_MSG_DELAY_I2C: // arg_int is the I2C speed in 100KHz, e.g. 4 = 400 KHz
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//delaynanoseconds(1250UL*arg_int);
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delaynanoseconds(1000UL*arg_int);
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break; // arg_int=1: delay by 5us, arg_int = 4: delay by 1.25us
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case U8X8_MSG_GPIO_MENU_SELECT:
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u8x8_SetGPIOResult(u8x8, /* get menu select pin state */ 0);
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break;
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case U8X8_MSG_GPIO_MENU_NEXT:
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u8x8_SetGPIOResult(u8x8, /* get menu next pin state */ 0);
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break;
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case U8X8_MSG_GPIO_MENU_PREV:
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u8x8_SetGPIOResult(u8x8, /* get menu prev pin state */ 0);
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break;
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case U8X8_MSG_GPIO_MENU_HOME:
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u8x8_SetGPIOResult(u8x8, /* get menu home pin state */ 0);
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break;
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default:
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u8x8_SetGPIOResult(u8x8, 1); // default return value
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break;
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}
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return 1;
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}
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@ -0,0 +1,21 @@
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/*
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raspi_gpio_hal.h
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This could needs to be compiled with -DU8X8_USE_PINS
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*/
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#ifndef raspi_gpio_hal_h
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#define raspi_gpio_hal_h
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#include "u8x8.h"
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void delaynanoseconds(unsigned long ns);
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int gpio_export(int pin);
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int gpio_direction(int pin, int dir);
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int gpio_write(int pin, int value);
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uint8_t u8x8_gpio_and_delay_raspi_gpio_hal(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr);
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#endif /* raspi_gpio_hal_h */
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GPIO only HAL functions for Raspberry Pi
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Manly based of the following (german) web sites:
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https://www.elektronik-kompendium.de/sites/raspberry-pi/2202101.htm
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http://www.netzmafia.de/skripten/hardware/RasPi/RasPi_GPIO_C.html
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CFLAGS = -O -I../hal -I../../../csrc -DU8X8_USE_PINS -ffunction-sections -fdata-sections
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LDFLAGS = -Wl,--gc-sections
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SRC = $(wildcard *.c) $(wildcard ../hal/*.c) $(wildcard ../../../csrc/*.c)
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OBJ = $(SRC:.c=.o)
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main: $(OBJ)
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$(CC) $(CFLAGS) $(LDFLAGS) $(OBJ) -o main
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clean:
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-rm $(OBJ)
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#include "raspi_gpio_hal.h"
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#include "u8g2.h"
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int main(void)
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{
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u8g2_t u8g2; // a structure which will contain all the data for one display
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u8g2_Setup_ssd1306_i2c_128x64_noname_f(&u8g2, U8G2_R0, u8x8_byte_sw_i2c, u8x8_gpio_and_delay_raspi_gpio_hal); // init u8g2 structure
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u8g2_InitDisplay(&u8g2); // send init sequence to the display, display is in sleep mode after this,
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u8g2_SetPowerSave(&u8g2, 0); // wake up display
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u8g2_SetFont(&u8g2, u8g2_font_6x12_tr);
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u8g2_DrawStr(&u8g2, 0, 20, "Hello World!");
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u8g2_SendBuffer(&u8g2);
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}
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