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Commit 7b56a163 authored by Erik Strand's avatar Erik Strand
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Make the midi test work

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with 63 additions and 79 deletions
midi_test.c
+ 63
− 79
View file @ 7b56a163
......@@ -29,6 +29,7 @@
#define pin_test(pins,pin) (pins & pin) // test for port pin
#define bit_test(byte,bit) (byte & (1 << bit)) // test for bit set
#define bit_delay_time 8.5 // bit delay for 115200 with overhead
//#define bit_delay_time 31.82 // bit delay for 31250 with overhead
#define bit_delay() _delay_us(bit_delay_time) // RS232 bit delay
#define half_bit_delay() _delay_us(bit_delay_time/2) // RS232 half bit delay
#define char_delay() _delay_ms(10) // char delay
......@@ -40,84 +41,65 @@
#define serial_pin_out (1 << PA1)
#define led_pin (1 << PB2)
#define input_pin (1 << PA5)
void put_char(volatile unsigned char *port, unsigned char pin, char txchar) {
//
// send character in txchar on port pin
// assumes line driver (inverts bits)
//
// start bit
//
clear(*port,pin);
bit_delay();
//
// unrolled loop to write data bits
//
if bit_test(txchar,0)
set(*port,pin);
else
clear(*port,pin);
bit_delay();
if bit_test(txchar,1)
set(*port,pin);
else
clear(*port,pin);
bit_delay();
if bit_test(txchar,2)
set(*port,pin);
else
clear(*port,pin);
bit_delay();
if bit_test(txchar,3)
set(*port,pin);
else
clear(*port,pin);
bit_delay();
if bit_test(txchar,4)
set(*port,pin);
else
clear(*port,pin);
bit_delay();
if bit_test(txchar,5)
set(*port,pin);
else
clear(*port,pin);
bit_delay();
if bit_test(txchar,6)
set(*port,pin);
else
clear(*port,pin);
bit_delay();
if bit_test(txchar,7)
set(*port,pin);
else
clear(*port,pin);
bit_delay();
//
// stop bit
//
set(*port,pin);
bit_delay();
//
// char delay
//
bit_delay();
}
void put_string(volatile unsigned char *port, unsigned char pin, char *str) {
//
// print a null-terminated string
//
static int index;
index = 0;
do {
put_char(port, pin, str[index]);
++index;
} while (str[index] != 0);
}
#define input_pin (1 << PA5)
// send character in txchar on port pin
// assumes line driver (inverts bits)
//
// start bit
clear(*port,pin);
bit_delay();
// unrolled loop to write data bits
if bit_test(txchar,0)
set(*port,pin);
else
clear(*port,pin);
bit_delay();
if bit_test(txchar,1)
set(*port,pin);
else
clear(*port,pin);
bit_delay();
if bit_test(txchar,2)
set(*port,pin);
else
clear(*port,pin);
bit_delay();
if bit_test(txchar,3)
set(*port,pin);
else
clear(*port,pin);
bit_delay();
if bit_test(txchar,4)
set(*port,pin);
else
clear(*port,pin);
bit_delay();
if bit_test(txchar,5)
set(*port,pin);
else
clear(*port,pin);
bit_delay();
if bit_test(txchar,6)
set(*port,pin);
else
clear(*port,pin);
bit_delay();
if bit_test(txchar,7)
set(*port,pin);
else
clear(*port,pin);
bit_delay();
// stop bit
set(*port,pin);
bit_delay();
// char delay
bit_delay();
}
int main(void) {
// Set the clock prescaler to 1.
......@@ -141,7 +123,7 @@ int main(void) {
// If it's been 10ms, reset the timer and increment count.
if (TCNT0 >= 200) {
TCNT0 = 0;
++count
++count;
// When count reaches 100, turn the LED on and send a note on command.
if (count == 100) {
......@@ -152,9 +134,11 @@ int main(void) {
}
// When count reaches 200, turn the LED off and send a note off command.
else if (++count == 200) {
else if (count == 200) {
PORTB &= ~led_pin;
put_char(&serial_port, serial_pin_out, 144); // note off
put_char(&serial_port, serial_pin_out, 128); // note off
put_char(&serial_port, serial_pin_out, 70); // note (A4)
put_char(&serial_port, serial_pin_out, 100); // velocity
count = 0;
}
}
......
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