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    
#define UART_MCR__RTS           0x02    
#define UART_MCR__OUT1          0x04    
#define UART_MCR__OUT2          0x08    
#define UART_MSR__DSR           0x20    
/************************************************************************/
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_*/