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136 lines
2.6 KiB
136 lines
2.6 KiB
/** @file ir_grab1.c
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@author M. P. Hayes, UCECE
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@date 24 August 2009
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@brief Test program for IR serial communnications.
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@defgroup ir_grab1 Test program for IR serial communications.
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*/
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#include "system.h"
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#include "navswitch.h"
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#include "tinygl.h"
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#include "pacer.h"
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#include "ir.h"
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#include "delay.h"
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#include "../fonts/font5x7_1.h"
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/* Define polling rate in Hz. */
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#define LOOP_RATE 300
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/* Define text update rate (characters per 10 s). */
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#define MESSAGE_RATE 10
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/* At 2400 baud and 36 kHz modulation, there are 15 cycles per bit. */
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#define CODE_LEN_MAX 2000
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#define CODESEQ_LEN_MAX 200
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#define IR_MODULATION_PERIOD_US (1e6 / IR_MODULATION_FREQ)
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#define TWEAK_US 0.5
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typedef struct code
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{
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uint16_t on;
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uint16_t off;
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} code_t;
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static void transmit (code_t *codeseq, uint8_t size)
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{
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uint8_t i;
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for (i = 0; i < size; i++)
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{
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ir_tx_set (1, codeseq[i].on);
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ir_tx_set (0, codeseq[i].off);
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}
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}
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static uint8_t capture (code_t *codeseq, uint8_t size)
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{
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uint8_t i;
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for (i = 0; i < size; i++)
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{
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uint16_t count;
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for (count = 0; count < CODE_LEN_MAX && ir_rx_get (); count++)
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{
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DELAY_US (IR_MODULATION_PERIOD_US - TWEAK_US);
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}
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codeseq[i].on = count;
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/* Something funny here. */
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if (count >= CODE_LEN_MAX)
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return 0;
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for (count = 0; count < CODE_LEN_MAX && !ir_rx_get (); count++)
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{
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DELAY_US (IR_MODULATION_PERIOD_US - TWEAK_US);
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}
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codeseq[i].off = count;
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if (count >= CODE_LEN_MAX)
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return i + 1;
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}
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return i;
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}
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static void show_char (char ch)
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{
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char buffer[2];
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buffer[0] = ch;
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buffer[1] = 0;
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tinygl_text (buffer);
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}
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int main (void)
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{
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uint8_t size = 0;
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code_t codeseq[CODESEQ_LEN_MAX];
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system_init ();
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tinygl_init (LOOP_RATE);
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tinygl_font_set (&font5x7_1);
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tinygl_text_speed_set (MESSAGE_RATE);
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navswitch_init ();
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ir_init ();
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pacer_init (LOOP_RATE);
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show_char ('W');
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/* Paced loop. */
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while (1)
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{
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/* Wait for next tick. */
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pacer_wait ();
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tinygl_update ();
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navswitch_update ();
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if (navswitch_push_event_p (NAVSWITCH_PUSH))
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{
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transmit (codeseq, size);
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show_char ('T');
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}
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if (ir_rx_get ())
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{
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size = capture (codeseq, CODESEQ_LEN_MAX);
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show_char (size == 0 ? 'E' : 'R');
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// size = capture (codeseq, 9);
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// show_char ('0' + size);
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}
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}
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return 0;
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}
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