UART.rar_C8051F040_C8051F040 uart1_C8051f040 Uart0 _c8051f040 UA

//----------------------------------------------------------------------------- // F04x_UARTs_STDIO_Polled_2UARTs.c //----------------------------------------------------------------------------- // Copyright 2005 Silicon Laboratories, Inc. // http://www.silabs.com // // Program Description: // // This program demonstrates configuration of UART0 and UART1 and includes // an example of how to overload the STDIO library functions to enable // selection of either UART0 or UART1 in code, via the "Uart" global variable. // // // How To Test: // // 1) Download code to a 'F04x device that is connected to a UART transceiver // 2) Verify jumpers J6 and J9 are populated on the 'F04x TB. // 3) Connect serial cable from the transceiver to a PC // 4) On the PC, open HyperTerminal (or any other terminal program) and connect // to the COM port at <BAUDRATE> and 8-N-1 // 5) HyperTerminal will print a message if everything is working properly // // // FID: 04X000032 // Target: C8051F04x // Tool chain: KEIL C51 7.50 / KEIL EVAL C51 // Command Line: None // // Release 1.0 // -Initial Revision (BW / TP) // -07 DEC 2006 // //----------------------------------------------------------------------------- // Includes //----------------------------------------------------------------------------- #include <C8051F040.h> // SFR declarations #include <stdio.h> //----------------------------------------------------------------------------- // 16-bit SFR Definitions for 'F04x //----------------------------------------------------------------------------- sfr16 RCAP2 = 0xCA; // Timer2 capture/reload sfr16 TMR2 = 0xCC; // Timer2 //----------------------------------------------------------------------------- // Global Constants //----------------------------------------------------------------------------- #define BAUDRATE 115200 // Baud rate of UART in bps // SYSCLK = System clock frequency in Hz #define SYSCLK 22118400L //----------------------------------------------------------------------------- // Function Prototypes //----------------------------------------------------------------------------- void OSCILLATOR_Init (void); void PORT_Init_UART0 (void); void PORT_Init_UART1 (void); void UART0_Init (void); void UART1_Init (void); //----------------------------------------------------------------------------- // Global Variables //----------------------------------------------------------------------------- unsigned char Uart; // Global variable -- when '0', UART0 // is used for stdio; when '1', UART1 // is used for stdio //----------------------------------------------------------------------------- // main() Routine //----------------------------------------------------------------------------- void main (void) { SFRPAGE = CONFIG_PAGE; WDTCN = 0xDE; // Disable watchdog timer WDTCN = 0xAD; OSCILLATOR_Init (); // Initialize oscillator PORT_Init_UART0 (); // Initialize crossbar and GPIO UART0_Init (); // Initialize UART0 UART1_Init (); // Initialize UART1 while (1) { // print something to UART0 PORT_Init_UART0 (); // Configure Crossbar to pinout // UART0 TX and RX to P0.0 and P0.1 Uart = 0; printf ("UART 0\n\n"); // now print something to UART1 PORT_Init_UART1 (); // Configure Crossbar to pinout // UART1 TX and RX to P0.0 and P0.1 Uart = 1; printf ("UART 1\n\n"); } } //----------------------------------------------------------------------------- // Initialization Subroutines //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- // OSCILLATOR_Init //----------------------------------------------------------------------------- // // Return Value : None // Parameters : None // // This function initializes the system clock to use an external 22.1184MHz // crystal. // //----------------------------------------------------------------------------- void OSCILLATOR_Init (void) { int i; // Software timer char SFRPAGE_SAVE = SFRPAGE; // Save Current SFR page SFRPAGE = CONFIG_PAGE; // Set SFR page OSCICN = 0x80; // Set internal oscillator to run // at its slowest frequency CLKSEL = 0x00; // Select the internal osc. as // the SYSCLK source // Initialize external crystal oscillator to use 22.1184 MHz crystal OSCXCN = 0x67; // Enable external crystal osc. for (i=0; i < 256; i++); // Wait at least 1ms while (!(OSCXCN & 0x80)); // Wait for crystal osc to settle CLKSEL = 0x01; // Select external crystal as SYSCLK // source SFRPAGE = SFRPAGE_SAVE; // Restore SFRPAGE } //----------------------------------------------------------------------------- // PORT_Init_UART0 //----------------------------------------------------------------------------- // // Return Value : None // Parameters : None // // This function configures the crossbar and GPIO ports. // // Pinout: // // P0.0 digital push-pull UART TX // P0.1 digital open-drain UART RX // P1.6 digital push-pull LED //----------------------------------------------------------------------------- void PORT_Init_UART0 (void) { char SFRPAGE_SAVE = SFRPAGE; // Save Current SFR page SFRPAGE = CONFIG_PAGE; // Set SFR page XBR0 = 0x04; // Enable UART0 XBR1 = 0x00; XBR2 = 0x40; // Enable crossbar and weak pull-up P0MDOUT |= 0x01; // Set TX pin to push-pull P1MDOUT |= 0x40; // Set P1.6(LED) to push-pull SFRPAGE = SFRPAGE_SAVE; // Restore SFR page } //----------------------------------------------------------------------------- // PORT_Init_UART1 //----------------------------------------------------------------------------- // // Return Value : None // Parameters : None // // This function configures the crossbar and GPIO ports. // // Pinout: // // P0.0 digital push-pull UART TX // P0.1 digital open-drain UART RX // P1.6 digital push-pull LED //----------------------------------------------------------------------------- void PORT_Init_UART1 (void) { char SFRPAGE_SAVE = SFRPAGE; // Save Current SFR page SFRPAGE = CONFIG_PAGE; // Set SFR page XBR0 = 0x00; XBR1 = 0x00; XBR2 = 0x44; // Enable crossbar and weak pull-up // Enable UART1 P0MDOUT |= 0x01; // Set TX pin to push-pull P1MDOUT |= 0x40; // Set P1.6(LED) to push-pull SFRPAGE = SFRPAGE_SAVE; // Restore SFR page } //----------------------------------------------------------------------------- // UART0_Init Variable baud rate, Timer 2, 8-N-1 //----------------------------------------------------------------------------- // // Return Value : None // Parameters : None // // Configure UART0 for operation at <BAUDRATE> 8-N-1 using Timer2 as // baud rate source. // //-------------------------------------------