66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
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/** \file
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\brief Display broker.
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Here we map generic display calls to calls to the actually used display and
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also define functions common to all displays.
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*/
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#include "display.h"
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#ifdef DISPLAY
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// Ringbuffer logic for buffer 'display'.
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#define BUFSIZE DISPLAY_BUFFER_SIZE
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volatile uint8_t displayhead = 0;
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volatile uint8_t displaytail = 0;
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volatile uint8_t displaybuf[BUFSIZE];
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#include "ringbuffer.h"
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#define TEACUP_C_INCLUDE
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#include "display_ssd1306.c"
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#undef TEACUP_C_INCLUDE
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#include "delay.h"
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/**
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Prints a character at the current cursor position.
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\param data The character to be displayed.
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This code is identical for all display buses and display types, because it
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just queues up the character.
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In case the buffer is full already it waits for a millisecond to allow
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data to be sent to the display, then it tries again. If it still fails then,
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it drops the character. This way we're fairly protected against data loss,
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still we guarantee to not hang forever.
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*/
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void display_writechar(uint8_t data) {
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if ( ! buf_canwrite(display)) {
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delay_ms(1);
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}
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if (buf_canwrite(display)) {
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buf_push(display, data);
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}
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}
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void display_writestr_P(PGM_P data_P) {
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uint8_t r, i = 0;
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// Yes, this is *supposed* to be assignment rather than comparison, so we
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// break when r is assigned zero.
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while ((r = pgm_read_byte(&data_P[i]))) {
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display_writechar(r);
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i++;
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}
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}
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#endif /* DISPLAY */
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