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void send_byte (uint8_t b) {
uint32_t l = 8;
do {
pin_lcd_st7920_e_reset();
if (b & (1 << 7)) {
pin_lcd_st7920_rw_set();
} else {
pin_lcd_st7920_rw_reset();
}
pin_lcd_st7920_e_set();
l--;
b <<= 1;
} while (l);
pin_lcd_st7920_e_reset();
}
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