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some documentation

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This commit is contained in:
Wolfgang Hottgenroth 2020-08-14 19:45:30 +02:00
parent 237edaa371
commit c642b64f06
Signed by: wn
GPG Key ID: B586EAFCDF2F65F4
1 changed files with 28 additions and 0 deletions
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28
main.c
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@ -4,6 +4,26 @@
#include <stdbool.h>
/*
* DEBUG_IDLE_BIT is toggled each cycle through the idle loop.
* DEBUG_ADC_BIT is toggled each time the ADC interrupt is fired.
*
* When the COMM_SAMPLE_HOLD_BIT is pulled to high, the next
* conversion result from the ADC is saved and held until the
* COMM_SAMPLE_HOLD_BIT goes to low again.
*
* When the COMM_ENABLE_BIT is pulled to high and an earlier ADC value
* is currently held, it is checked whether the current ADC value is
* by SPACE_MARK_THRESHOLD greater then the held value.
* If it is greater, the COMM_RESULT_BIT is set to high, otherwise
* it is set to low.
*
* If either the COMM_ENABLE_BIT or the COMM_SAMPLE_HOLD_BIT goes to
* low the COMM_RESULT_BIT is set to low.
*/
#define DEBUG
#define DEBUG_PORT P1OUT
#define DEBUG_PORT_DIR P1DIR
#define DEBUG_IDLE_BIT BIT7
@ -43,9 +63,13 @@ void adcIsr(void)
} else {
COMM_PORT_OUT &= ~COMM_RESULT_BIT;
}
} else {
COMM_PORT_OUT &= ~COMM_RESULT_BIT;
}
#ifdef DEBUG
DEBUG_PORT ^= DEBUG_ADC_BIT;
#endif // DEBUG
}
@ -61,8 +85,10 @@ void setup() {
BCSCTL3 = 0;
// debug port configuration, obviously
#ifdef DEBUG
DEBUG_PORT_DIR |= DEBUG_IDLE_BIT | DEBUG_ADC_BIT;
DEBUG_PORT &= ~(DEBUG_IDLE_BIT | DEBUG_ADC_BIT);
#endif // DEBUG
// communication
COMM_PORT_DIR |= COMM_RESULT_BIT;
@ -82,7 +108,9 @@ void setup() {
void loop() {
#ifdef DEBUG
DEBUG_PORT ^= DEBUG_IDLE_BIT;
#endif // DEBUG
}