uart1_mode1_timer2_12T.h

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#ifndef STC15_UART1MODE1_T212H
#define STC15_UART1MODE1_T212H
 
#include <stdint.h>
 
#include <sys.h>
#include <bits.h>
#include <frequency.h>
#include <interrupt.h>
#include <uart1_shared.h>
#include <uart1_8bit_shared.h>
 
typedef enum
#if __SDCC_VERSION_MAJOR == 4 && __SDCC_VERSION_MINOR >= 5
    : uint16_t
#endif
{
    baudrate_1200 = 0xFF3F,
    baudrate_2400 = 0xFF9F,
    baudrate_4800 = 0xFFCF,
    baudrate_9600 = 0xFFE7,
} uart1_mode1_timer2_12t_baudrate_t;
 
#define uart1_mode1_timer2_12T_init(pins)   \
do {                                        \
                                            \
    enable_mcu_interrupts();                \
    disable_uart1_interrupt();              \
    disable_timer2_interrupt();             \
                                            \
    PCON &= 0x3F;                           \
    SCON = 0x50;                            \
                                            \
    /* The clock source of Timer 2 is SYSclk/12. AUXR.T2x12 = 0 */  \
    /* AUXR.UART_M0x6 = 0 */                                        \
    /* Timer2 is not started. AUXR.T2R = 0 */                       \
    /* Timer2 are used as timer. AUXR.T2_C/T = 0 */                 \
    AUXR &= 0xC2;                           \
                                            \
    /* Select Timer2 as UART1 baud rate generator. AUXR.S1ST2 = 1; */ \
    bit_set(AUXR, SBIT0);                   \
                                            \
    /* Point-to-point mode */               \
    bit_clr(CLK_DIV, CBIT4);                \
                                            \
    /* Set AUXR1 bits 6, 7 to select RxD/TxD pins */                 \
    AUXR1 &= 0x3F;                          \
    AUXR1 |= pins;                          \
} while(0)    
 
#define uart1_mode1_timer2_12T_start(baudrate)          \
do {                                                    \
    /* Set TH TL values */                              \
    T2L = baudrate & 0xFF;                              \
    T2H = baudrate >> 8;                                \
                                                        \
    /* Start Timer2 */                                  \
    bit_set(AUXR, SBIT4);                               \
} while(0)
 
#define uart1_mode1_timer2_12T_ticks(baudrate) (65536 - ((((MAIN_Fosc / 12) / baudrate) >> 2) >> get_frequency_divider_scale()))
 
#define uart1_mode1_timer2_12T_start_ext(baudrate)              \
do {                                                            \
    const uint16_t ticks = uart1_mode1_timer2_12T_ticks(baudrate);\
                                                                \
    /* Set TH TL values */                                      \
    T2L = ticks & 0xFF;                                         \
    T2H = ticks >> 8;                                           \
                                                                \
    /* Start Timer2 */                                          \
    bit_set(AUXR, SBIT4);                                       \
} while (0)
 
#define uart1_mode1_timer2_12T_stop (bit_clr(AUXR, CBIT4))
 
#define is_uart1_mode1_timer2_12T_started() (test_if_bit_set(AUXR, SBIT4))
 
#endif