uart.zip_TMS320 uart_dm642 uart_dm642 串口试验

#include <stdio.h> #include <string.h> #include <std.h> #include <sys.h> #include "uart.h" #include "emif.h" unsigned char HW_uart_putchar(HW_uart_handle hUart, unsigned char data); unsigned char HW_uart_getchar(HW_uart_handle hUart, unsigned char *data); void HW_UartInit(HW_uart_handle *hUart, unsigned int baudrate, int port); static unsigned char HW_rget(HW_uart_handle hUart, unsigned int regnum); static void HW_rset(HW_uart_handle hUart, unsigned int regnum, unsigned char regval); static void HW_uart_rset(HW_uart_handle hUart, unsigned int regnum, unsigned char regval); static unsigned char HW_uart_rget(HW_uart_handle hUart, unsigned int regnum); static void HW_uart_config(HW_UART_CONFIG *uartcfg); static HW_UART_CONFIG uartcfg; /* * Set a UART register */ /* Read an 8-bit value from a EMIF interface */ static unsigned char HW_rget(HW_uart_handle hUart, unsigned int regnum) { Uint8 *pdata; /* Return lower 8 bits of register */ if(hUart == HW_UARTA) pdata = (Uint8 *)(HW_UARTA_BASEADDR + regnum); else pdata = (Uint8 *)(HW_UARTB_BASEADDR + regnum); return (*pdata & 0xff); } /* Write an 8-bit value to a EMIF interface */ static void HW_rset(HW_uart_handle hUart, unsigned int regnum, unsigned char regval) { Uint8 *pdata; /* Write lower 8 bits of register */ if(hUart == HW_UARTA) pdata = (Uint8 *)(HW_UARTA_BASEADDR + regnum); else pdata = (Uint8 *)(HW_UARTB_BASEADDR + regnum); *pdata= (regval & 0xff); } /* * Get the value of a UART register */ static void HW_uart_rset(HW_uart_handle hUart, unsigned int regnum, unsigned char regval) { Int16 regindex, lcr; /* Register index is determined by lower 3 bits and the target UART */ regindex = regnum & 0x7; /* If regnum between 0x08 and 0x0F, set bit 7 of LCR to access register */ //if ((regnum & 0x18) == 0x8) if((regnum == 0x8)||(regnum == 0x9)) { lcr = HW_uart_rget(hUart, HW_UART_LCR); HW_uart_rset(hUart, HW_UART_LCR, lcr | 0x80); HW_waitusec(1); HW_rset(hUart, regindex, regval); HW_waitusec(1); HW_uart_rset(hUart, HW_UART_LCR, lcr); HW_waitusec(1); } else { HW_rset(hUart, regindex, regval); HW_waitusec(10); } } static unsigned char HW_uart_rget(HW_uart_handle hUart, unsigned int regnum) { Int16 regindex, lcr; Uint8 returnval; /* Register index is determined by lower 3 bits and the target UART */ regindex = regnum & 0x7; /* If regnum between 0x08 and 0x0F, set bit 7 of LCR to access register */ //if ((regnum & 0x08) == 0x8)//原来这么写 //if ((regnum & 0x08) == 0x8) if((regnum == 0x8)||(regnum == 0x9)) { lcr = HW_uart_rget(hUart, HW_UART_LCR); HW_uart_rset(hUart, HW_UART_LCR, lcr | 0x80); HW_waitusec(1); returnval = HW_rget(hUart, regindex); HW_uart_rset(hUart, HW_UART_LCR, lcr); HW_waitusec(1); } else { returnval = HW_rget(hUart, regindex); } return returnval; } unsigned char HW_uart_getchar(HW_uart_handle hUart, unsigned char *data) { Uint8 status; Bool ret; status = HW_uart_rget(hUart, HW_UART_LSR); if ((status & 1) != 0) // DR ret = TRUE; else ret = FALSE; if(ret) { *data = HW_uart_rget(hUart, HW_UART_RBR); } return ret; } unsigned char HW_uart_putchar(HW_uart_handle hUart, unsigned char data) { Uint8 status; Bool ret; status = HW_uart_rget(hUart, HW_UART_LSR); if ((status & 0x20) != 0) // THRE ret = TRUE; else ret = FALSE; if(ret) { HW_uart_rset(hUart, HW_UART_THR, data); } return ret; } static void HW_uart_config(HW_UART_CONFIG *uartcfg) { uartcfg->regs[0] = 0x00; // IER //uartcfg->regs[1] = 0x07; // FCR - FIFO Mode, 16 character trigger level //uartcfg->regs[1] = 0x37; // FCR - FIFO Mode, 8 character fifo for receive, //56 character for transfer trigger level uartcfg->regs[1] = 0x57; // FCR - FIFO Mode, 16 character fifo for receive, //16 character for transfer trigger level uartcfg->regs[2] = 0x03; // LCR - 8 bits, no parity, 1 stop uartcfg->regs[3] = 0x00; // MCR } /* UART initialize */ void HW_UartInit(HW_uart_handle *hUart, unsigned int baudrate, int port) { *hUart = port; HW_uart_config(&uartcfg); HW_uart_rset(*hUart, HW_UART_IER, uartcfg.regs[0]); HW_uart_rset(*hUart, HW_UART_FCR, uartcfg.regs[1]); HW_uart_rset(*hUart, HW_UART_LCR, uartcfg.regs[2]); HW_uart_rset(*hUart, HW_UART_MCR, uartcfg.regs[3]); /* Set up baud divisor clock */ HW_uart_rset(*hUart, HW_UART_DLL, baudrate & 0xff); HW_uart_rset(*hUart, HW_UART_DLH, (baudrate >> 8) & 0xff); /* Clear any outstanding receive characters */ HW_uart_rget(*hUart, HW_UART_RBR); }