Adding initial ARM UART structure for UART0

[kiibohd-controller.git] / Scan / MBC-55X / scan_loop.c

diff --git a/Scan/MBC-55X/scan_loop.c b/Scan/MBC-55X/scan_loop.c
index be23572f70e2dfa5e528c3461e49f90aba099095..d476bce983f8afb8fe9c05ed1661b8c478a5d71b 100644 (file)
--- a/Scan/MBC-55X/scan_loop.c
+++ b/Scan/MBC-55X/scan_loop.c
@@ -75,14 +75,24 @@ void uart0_status_isr(void)
 #if defined(_at90usb162_) || defined(_atmega32u4_) || defined(_at90usb646_) || defined(_at90usb1286_) // AVR
        uint8_t tmp = UDR1;
 #elif defined(_mk20dx128_) // ARM
-       // TODO
-       uint8_t tmp = 0;
+       // Exit out if nothing to do
+       /*
+       if ( !(UART0_S1 & UART_S1_RDRF ) )
+       {
+               sei();
+               return;
+       }
+       */
+
+       // Only doing single byte FIFO here
+       uint8_t tmp = UART0_D;
+       print("YAYA");
 #endif
 
        // Debug
        char tmpStr[6];
        hexToStr( tmp, tmpStr );
-       dPrintStrs( tmpStr, " " ); // Debug
+       dPrintStrsNL( tmpStr, " " ); // Debug
 
        // TODO
 
@@ -99,20 +109,21 @@ inline void scan_setup()
 {
        // Setup the the USART interface for keyboard data input
 
-       // TODO
-       // Setup baud rate
+       // Setup baud rate - 1205 Baud
        // 16 MHz / ( 16 * Baud ) = UBRR
-       // Baud: 4817 -> 16 MHz / ( 16 * 4817 ) = 207.5981
-       // Thus baud setting = 208
-       uint16_t baud = 208; // Max setting of 4095
+       // Baud: 1205 -> 16 MHz / ( 16 * 1205 ) = 829.8755
+       // Thus baud setting = 830
+       uint16_t baud = 830; // Max setting of 4095
        UBRR1H = (uint8_t)(baud >> 8);
        UBRR1L = (uint8_t)baud;
 
        // Enable the receiver, transmitter, and RX Complete Interrupt
+       // TODO - Only receiver, and rx interrupt
        UCSR1B = 0x98;
 
        // Set frame format: 8 data, 1 stop bit, odd parity
        // Asynchrounous USART mode
+       // TODO - Even parity
        UCSR1C = 0x36;
 
        // Reset the keyboard before scanning, we might be in a wierd state
@@ -121,9 +132,48 @@ inline void scan_setup()
 #elif defined(_mk20dx128_) // ARM
 {
        // Setup the the UART interface for keyboard data input
+       SIM_SCGC4 |= SIM_SCGC4_UART0; // Disable clock gating
 
-       // Setup baud rate
-       // TODO
+       // Pin Setup for UART0
+       PORTB_PCR16 = PORT_PCR_PE | PORT_PCR_PS | PORT_PCR_PFE | PORT_PCR_MUX(3); // RX Pin
+       PORTB_PCR17 = PORT_PCR_DSE | PORT_PCR_SRE | PORT_PCR_MUX(3); // TX Pin
+
+       // Setup baud rate - 1205 Baud
+       // 48 MHz / ( 16 * Baud ) = BDH/L
+       // Baud: 1205 -> 48 MHz / ( 16 * 1205 ) = 2489.6266
+       // Thus baud setting = 2490
+       // NOTE: If finer baud adjustment is needed see UARTx_C4 -> BRFA in the datasheet
+       uint16_t baud = 2490; // Max setting of 8191
+       UART0_BDH = (uint8_t)(baud >> 8);
+       UART0_BDL = (uint8_t)baud;
+
+       // 8 bit, Even Parity, Idle Character bit after stop
+       UART0_C1 = ~UART_C1_M | UART_C1_PE | ~UART_C1_PT | UART_C1_ILT;
+
+       // Number of bytes in FIFO before TX Interrupt
+       UART0_TWFIFO = 1;
+
+       // Number of bytes in FIFO before RX Interrupt
+       UART0_RWFIFO = 1;
+
+       // TX FIFO Disabled, TX FIFO Size 1 (Max 8 datawords), RX FIFO Enabled, RX FIFO Size 1 (Max 8 datawords)
+       // TX/RX FIFO Size:
+       //  0x0 - 1 dataword
+       //  0x1 - 4 dataword
+       //  0x2 - 8 dataword
+       UART0_PFIFO = ~UART_PFIFO_TXFE | /*TXFIFOSIZE*/ (0x0 << 4) | ~UART_PFIFO_RXFE | /*RXFIFOSIZE*/ (0x0);
+
+       // TX Disabled, RX Enabled, RX Interrupt Enabled
+       UART0_C2 = UART_C2_TE | UART_C2_RE | UART_C2_RIE;
+
+       // Reciever Inversion Disabled
+       UART0_S2 = ~UART_S2_RXINV;
+
+       // Transmit Inversion Disabled
+       UART0_C3 = ~UART_S2_TXINV;
+
+       // Add interrupt to the vector table
+       NVIC_ENABLE_IRQ( IRQ_UART0_STATUS );
 
        // Reset the keyboard before scanning, we might be in a wierd state
        scan_resetKeyboard();
@@ -134,6 +184,8 @@ inline void scan_setup()
 // Main Detection Loop
 inline uint8_t scan_loop()
 {
+       UART0_D = 0x56;
+       _delay_ms( 100 );
        return 0;
 }
 
@@ -187,7 +239,8 @@ void removeKeyValue( uint8_t keyValue )
        }
 }
 
-// Send data 
+// Send data
+// NOTE: Example only, MBC-55X cannot receive user data
 uint8_t scan_sendData( uint8_t dataPayload )
 {
        // Debug
@@ -198,7 +251,7 @@ uint8_t scan_sendData( uint8_t dataPayload )
 #if defined(_at90usb162_) || defined(_atmega32u4_) || defined(_at90usb646_) || defined(_at90usb1286_) // AVR
        UDR1 = dataPayload;
 #elif defined(_mk20dx128_) // ARM
-       // TODO
+       UART0_D = dataPayload;
 #endif
 
        return 0;