commit f61f9355daeb1ff28716f40087d7380c0b219713
parent 4644a4b0ae20267b9692885b2bacc6b467b382ac
Author: Vineet K <git@vineetk.net>
Date: Sun, 21 Apr 2024 22:30:53 -0400
read lcd values from usart instead of random
Diffstat:
| M | lcd.c | | | 38 | +++++++++++++++++++++++++++++++------- |
1 file changed, 31 insertions(+), 7 deletions(-)
diff --git a/lcd.c b/lcd.c
@@ -23,6 +23,35 @@ char notesBuffer[NOTES_BUFFER_SIZE];
int serialIndex = 0;
int notesIndex = 0;
volatile int buttonState = 0; // Holds the state of all buttons
+
+void
+usart_init(void)
+{
+ // 9600 bps, RX enabled
+ UBRR0 = 103;
+ UCSR0B = 1 << RXEN0;
+ UCSR0C = (1 << UCSZ01) | (1 << UCSZ00);
+}
+
+char
+getNote(void)
+{
+ while (!(UCSR0A & (1 << RXC0)));
+
+ unsigned char c = UDR0;
+
+ // convert 0-9 to ascii character
+ if (c <= 9)
+ c += '0';
+ // convert to capital hex
+ else if (c >= 0xa && c <= 0xf)
+ c = c - 0xa + 'A';
+ // shift to rest of alphabet
+ else if (c >= 0x10)
+ c = c - 0x10 + 'G';
+
+ return c;
+}
//
void lcd_putValue(unsigned char val)
{
@@ -111,11 +140,6 @@ char getSerialData() {
return ' ';
}
-char getNote() {
- // Read notes data and return it
- return ' ';
-}
-
void setup() {
// Initialize Serial communication
// Initialize LCD
@@ -154,7 +178,7 @@ void displayNotes() {
lcd_clear();
_delay_ms(1000);
while (buttonState == 4) {
- char randomValue = '0' + (rand() % 10);
+ char randomValue = getNote();
if (bufferIndex == 16) {
// Remove the first value and shift other values down
@@ -196,7 +220,7 @@ void displaySerialData() {
lcd_clear();
_delay_ms(1000);
while (buttonState == 5) {
- char randomValue = '0' + (rand() % 10);
+ char randomValue = getNote();
if (bufferIndex == 16) {
// Remove the first value and shift other values down
