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Adding initial ARM UART structure for UART0 

- Transmit seems to be working
- Receive isn't working yet
- Inversion of the transmit signal doesn't seem to be working
simple
Jacob Alexander 11 년 전
부모
4c7a4d98d4
커밋
4da44b8ff7
2개의 변경된 파일과 67개의 추가작업 그리고 12개의 파일을 삭제
분할 보기 변경상태 보기
  1. 2
    0
      Lib/mk20dx128.h
  2. 65
    12
      Scan/MBC-55X/scan_loop.c

+ 2
- 0
Lib/mk20dx128.h 파일 보기

@@ -1084,7 +1084,9 @@ extern "C" {
#define UART_S1_FE (uint8_t)0x02 // Framing Error Flag
#define UART_S1_PF (uint8_t)0x01 // Parity Error Flag
#define UART0_S2 *(volatile uint8_t *)0x4006A005 // UART Status Register 2
#define UART_S2_RXINV (uint8_t)0x10 // RX Line Inversion Enable
#define UART0_C3 *(volatile uint8_t *)0x4006A006 // UART Control Register 3
#define UART_S2_TXINV (uint8_t)0x10 // TX Line Inversion Enable
#define UART0_D *(volatile uint8_t *)0x4006A007 // UART Data Register
#define UART0_MA1 *(volatile uint8_t *)0x4006A008 // UART Match Address Registers 1
#define UART0_MA2 *(volatile uint8_t *)0x4006A009 // UART Match Address Registers 2

+ 65
- 12
Scan/MBC-55X/scan_loop.c 파일 보기

@@ -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;