Add support for linux i2c userspace
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ken restivo
parent
8e13150067
commit
fa56080c44
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*.o
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*.~
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#include <linux-i2c.h>
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#include <u8g2.h>
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#include <stdio.h>
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#define SSD1306_ADDR 0x3c
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u8g2_t u8g2;
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int main (void)
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{
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// u8g2_Setup_ssd1305_i2c_128x32_noname_1(&u8g2, U8G2_R0, u8x8_byte_linux_i2c, u8x8_linux_i2c_delay);
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// u8g2_Setup_ssd1305_i2c_128x32_adafruit_1(&u8g2, U8G2_R0, u8x8_byte_linux_i2c, u8x8_linux_i2c_delay);
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u8g2_Setup_ssd1306_i2c_128x32_univision_1(&u8g2, U8G2_R0, u8x8_byte_linux_i2c, u8x8_linux_i2c_delay);
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// u8g2_Setup_ssd1305_i2c_128x32_noname_2(&u8g2, U8G2_R0, u8x8_byte_linux_i2c, u8x8_linux_i2c_delay);
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// u8g2_Setup_ssd1305_i2c_128x32_adafruit_2(&u8g2, U8G2_R0, u8x8_byte_linux_i2c, u8x8_linux_i2c_delay);
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// u8g2_Setup_ssd1306_i2c_128x32_univision_2(&u8g2, U8G2_R0, u8x8_byte_linux_i2c, u8x8_linux_i2c_delay);
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// u8g2_Setup_ssd1305_i2c_128x32_noname_f(&u8g2, U8G2_R0, u8x8_byte_linux_i2c, u8x8_linux_i2c_delay);
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// u8g2_Setup_ssd1305_i2c_128x32_adafruit_f(&u8g2, U8G2_R0, u8x8_byte_linux_i2c, u8x8_linux_i2c_delay);
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// u8g2_Setup_ssd1306_i2c_128x32_univision_f(&u8g2, U8G2_R0, u8x8_byte_linux_i2c, u8x8_linux_i2c_delay);
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u8g2_SetI2CAddress(&u8g2, SSD1306_ADDR);
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u8g2_InitDisplay(&u8g2);
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u8g2_SetPowerSave(&u8g2, 0);
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u8g2_ClearBuffer(&u8g2);
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u8g2_SetFont(&u8g2, u8g2_font_smart_patrol_nbp_tr);
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u8g2_SetFontRefHeightText(&u8g2);
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u8g2_SetFontPosTop(&u8g2);
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u8g2_DrawStr(&u8g2, 0, 15, "u8g2 Linux I2C");
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u8g2_SendBuffer(&u8g2);
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}
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/i2c-dev.h>
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#include <linux/i2c-dev.h>
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#include <i2c/smbus.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/ioctl.h>
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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 <u8x8.h>
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#include <unistd.h>
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#define BUFSIZ_I2C 32
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char filename[255];
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uint8_t data[BUFSIZ_I2C]; // just to be sure
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int idx = 0;
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// almost certainly the wrong place for this state!
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int file = 1;
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uint8_t addr = 0x3c;
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int adapter_nr = 0; /* probably dynamically determined */
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uint8_t
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u8x8_byte_linux_i2c(u8x8_t *u8x8,
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uint8_t msg,
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uint8_t arg_int,
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void *arg_ptr)
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{
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switch(msg){
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case U8X8_MSG_BYTE_SEND:
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//fprintf(stderr, "-- %d bytes:\n", arg_int);
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for(int i = 0; i < arg_int && idx < BUFSIZ_I2C; i++, idx++){
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data[idx] = *(uint8_t *)(arg_ptr+i);
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//fprintf(stderr, " %d %d: %0x\n", i, idx, data[idx]);
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}
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break;
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case U8X8_MSG_BYTE_INIT:
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// ths open/setup? it seems to be a one-time setup
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snprintf(filename, 19, "/dev/i2c-%d", adapter_nr);
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file = open(filename, O_RDWR);
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if (file < 0) {
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fprintf(stderr, "can't open i2c\n");
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return(errno);
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}
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fprintf(stderr, "opened i2c file %d\n", file);
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if (ioctl(file, I2C_SLAVE, addr) < 0) { // u8x8_GetI2CAddress(u8x8)
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fprintf(stderr, "can't set addr %0x\n", addr);
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return(errno);
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}
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fprintf(stderr, "set i2c addr %0x\n", addr);
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break;
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case U8X8_MSG_BYTE_SET_DC:
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/* ignored for i2c */
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//fprintf(stderr, "++ set dc?\n");
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break;
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case U8X8_MSG_BYTE_START_TRANSFER:
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//fprintf(stderr, "++ start transfer, resetting buffers\n");
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memset(data, 0, BUFSIZ_I2C);
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idx = 0;
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break;
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case U8X8_MSG_BYTE_END_TRANSFER:
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//fprintf(stderr, "++ end transfer, sending cmd %0x %0x count %d\n", data[0], data[1], idx);
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// NB! note the extre _i2c_ in there! leave that out and you are screwed
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if (i2c_smbus_write_i2c_block_data(file, data[0], idx - 1, &data[1]) < 0) {
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fprintf(stderr, "can't write cmd %0x: %s\n", data[0], strerror(errno));
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return(errno);
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}
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break;
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default:
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fprintf(stderr, "unknown msg type %d\n", msg);
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return 0;
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}
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return 1;
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}
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uint8_t
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u8x8_linux_i2c_delay(u8x8_t *u8x8,
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uint8_t msg,
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uint8_t arg_int,
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void *arg_ptr)
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{
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struct timespec req;
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struct timespec rem;
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int ret;
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req.tv_sec = 0;
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switch(msg) {
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case U8X8_MSG_DELAY_NANO: // delay arg_int * 1 nano second
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req.tv_nsec = 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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req.tv_nsec = arg_int * 100;
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break;
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case U8X8_MSG_DELAY_10MICRO: // delay arg_int * 10 micro seconds
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req.tv_nsec = arg_int * 10000;
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break;
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case U8X8_MSG_DELAY_MILLI: // delay arg_int * 1 milli second
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req.tv_nsec = arg_int * 1000000;
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break;
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default:
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return 0;
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}
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while((ret = nanosleep(&req, &rem)) && errno == EINTR){
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struct timespec tmp = req;
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req = rem;
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rem = tmp;
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}
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if (ret) {
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perror("nanosleep");
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fprintf(stderr, "can't sleep\n");
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return(errno);
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}
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return 1;
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}
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#ifndef _LINUX_I2C_H
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#define _LINUX_I2C_H 1
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/i2c-dev.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <sys/ioctl.h>
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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 <u8x8.h>
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#include <unistd.h>
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uint8_t u8x8_byte_linux_i2c(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr);
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uint8_t u8x8_linux_i2c_delay (u8x8_t * u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr) ;
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#endif // LINUXi2c
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