ARM9教程DSP教程FPGA教程CPLD教程12A软硬件设计0229(15)

ARM9教程DSP教程FPGA教程CPLD教程12A软硬件设计0229

#define SET_UART_RI(x, b) (UART_SCON(x)=(UART_SCON(x) & 0xFE) | b )

void srl0_init( unsigned int base, unsigned int baudrate ) {

unsigned short baud_calc;

UART_TCON(base) = 0x00; // 0b00000000 // |

// `-------- Timer Run Control = 0: stop UART_SCON(base) = 0x50; // 0b01010000 // || | ||

// || | |`-- RI = 0: clear receiver interrupt // || | `--- TI = 0: clear transmitter interrupt // || `------ REN = 1: enable receiver

// ``-------- SMOD = 01: mode 1 (8 bit UART with variable baudrate) UART_ADCON(base) = 0x80; // 0b10000000 // |

// `--------- BD = 1: use internal baudrate generator UART_PCON(base) = 0x00; // 0b00000000 // |

// `--------- SMOD = 0: Do not double baudrate baud_calc = (timing_get_clock_freq_hz() / (baudrate * 64 + baudrate / 2)); UART_SRELL(base) = (1024 - baud_calc) & 0xFF;

UART_SRELH(base) = ((1024 - baud_calc) >> 8) & 0xFF; UART_TCON(base) = 0x40; // Start timer run control }

void srl0_put_byte( unsigned int base, unsigned char val ) {

SET_UART_TI(base, 0); UART_SBUF(base) = val; }

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