16c550.h

/************************************************************************/
#ifndef _16C550_H_
#define _16C550_H_

#include "types.h"

#if (MODULE_MEGAWIFI != 0)

#define UART_BASE               0xA130C1

#define UART_CLK                24000000LU

#define UART_BR                 1500000LU
//#define UART_BR                       500000LU
//#define UART_BR                       750000LU
//#define UART_BR                       115200

#define UART_TX_FIFO_LEN                16

#define DivWithRounding(dividend, divisor)      ((((dividend)*2/(divisor))+1)/2)

#define UART_DLM_VAL    (DivWithRounding(UART_CLK, 16 * UART_BR)>>8)
//#define UART_DLM_VAL  ((UART_CLK/16/UART_BR)>>8)
#define UART_DLL_VAL    (DivWithRounding(UART_CLK, 16 * UART_BR) & 0xFF)
//#define UART_DLL_VAL  ((UART_CLK/16/UART_BR)&0xFF)


#define UART_RHR        (*((volatile uint8_t*)(UART_BASE +  0)))

#define UART_THR        (*((volatile uint8_t*)(UART_BASE +  0)))

#define UART_IER        (*((volatile uint8_t*)(UART_BASE +  2)))

#define UART_FCR        (*((volatile uint8_t*)(UART_BASE +  4)))

#define UART_ISR        (*((volatile uint8_t*)(UART_BASE +  4)))

#define UART_LCR        (*((volatile uint8_t*)(UART_BASE +  6)))

#define UART_MCR        (*((volatile uint8_t*)(UART_BASE +  8)))

#define UART_LSR        (*((volatile uint8_t*)(UART_BASE + 10)))

#define UART_MSR        (*((volatile uint8_t*)(UART_BASE + 12)))

#define UART_SPR        (*((volatile uint8_t*)(UART_BASE + 14)))

#define UART_DLL        (*((volatile uint8_t*)(UART_BASE +  0)))

#define UART_DLM        (*((volatile uint8_t*)(UART_BASE +  2)))


typedef struct {
        uint8_t IER;    
        uint8_t FCR;    
        uint8_t LCR;    
        uint8_t MCR;    
} UartShadow;

extern UartShadow sh;

#define UART_MCR__DTR           0x01    ///< Data Terminal Ready.
#define UART_MCR__RTS           0x02    ///< Request To Send.
#define UART_MCR__OUT1          0x04    ///< GPIO pin 1.
#define UART_MCR__OUT2          0x08    ///< GPIO pin 2.

#define UART_MSR__DSR           0x20    ///< Data Set Ready

/************************************************************************/
void uart_init(void);

/************************************************************************/
#define uart_tx_ready() (UART_LSR & 0x20)

/************************************************************************/
#define uart_rx_ready() (UART_LSR & 0x01)

/************************************************************************/
#define uart_putc(c)            do{UART_RHR = (c);}while(0);

/************************************************************************/
#define uart_getc()             (UART_RHR)

/************************************************************************/
#define uart_set(reg, val)      do{sh.reg = (val);UART_##reg = (val);}while(0)

/************************************************************************/
#define uart_get(reg)           (sh.reg)

/************************************************************************/
#define uart_set_bits(reg, val) do{sh.reg |= (val);                     \
        UART_##reg = sh.reg;}while(0)

/************************************************************************/
#define uart_clr_bits(reg, val) do{sh.reg &= ~(val);                    \
        UART_##reg = sh.reg;}while(0)

/************************************************************************/
#define uart_reset_fifos()      uart_set_bits(FCR, 0x07)

#endif // MODULE_MEGAWIFI

#endif /*_16C550_H_*/