F32xSPI0EEPROMPolledMode.docx

1、F32xSPI0EEPROMPolledMode/-/ F32x_SPI0_EEPROM_Polled_Mode.c/-/ Copyright 2006 Silicon Laboratories, Inc./ / Program Description:/ This program accesses a SPI EEPROM using polled mode access. The F32x MCU / is configured in 4-wire Single Master Mode, and the EEPROM is the only / slave device connected

2、 to the SPI bus. The read/write operations are / tailored to access a Microchip 4 kB EEPROM 25LC320. The relevant hardware / connections of the F32x MCU are shown here:/ / P0.0 - SPI SCK (digital output, push-pull)/ P0.1 - SPI MISO (digital input, open-drain)/ P0.2 - SPI MOSI (digital output, push-p

3、ull)/ P0.3 - SPI NSS (digital output, push-pull)/ P0.4 - UART TXD (digital output, push-pull)/ P0.5 - UART RXD (digital input, open-drain)/ P2.2 - LED (digital output, push-pull)/ How To Test:/ Method1:/ 1) Download the code to a F32x device that is connected as above./ 2) Run the code. The LED will

4、 blink fast during the write/read/verify / operations./ 3) If the verification passes, the LED will blink slowly. If it fails,/ the LED will be OFF./ Method2 (optional):/ 1) Download code to a F32x device that is connected as above, and / also connected to a RS232 transceiver./ 2) Connect a straight

5、 serial cable from the RS232 transceiver to a PC./ 3) On the PC, open HyperTerminal (or any other terminal program) and connect/ to the COM port at and 8-N-1/ 4) HyperTerminal will print the progress of the write/read operation, and in / the end will print the test result as pass or fail. Additional

6、ly, if the / verification passes, the LED will blink slowly. If it fails, the LED will / be OFF./ Target: C8051F320/1/ Tool chain: Keil C51 7.50 / Keil EVAL C51/ Command Line: None/ Release 1.0/ -Initial Revision (PKC)/ -18 MAY 2006/-/ Includes/-#include / SFR declarations#include / printf is declar

7、ed here/-/ 16-bit SFR Definitions for the F32x/-sfr16 TMR2 = 0xCC; / Timer2 low and high bytes together/-/ User-defined types, structures, unions etc/-#ifndef BYTE#define BYTE unsigned char#endif#ifndef UINT#define UINT unsigned int#endif/-/ Global Constants/-#define BAUDRATE 115200 / Baud rate of U

8、ART in bps#define SYSCLK 24000000 / Internal oscillator frequency in Hz/ Microchip 25AA320 Slave EEPROM Parameters#define F_SCK_MAX 2000000 / Max SCK freq (Hz)#define T_NSS_DISABLE_MIN 500 / Min NSS disable time (ns)#define EEPROM_CAPACITY 4096 / EEPROM capacity (bytes)/ EEPROM Instruction Set#defin

9、e EEPROM_CMD_READ 0x03 / Read Command#define EEPROM_CMD_WRITE 0x02 / Write Command#define EEPROM_CMD_WRDI 0x04 / Reset Write Enable Latch Command#define EEPROM_CMD_WREN 0x06 / Set Write Enable Latch Command#define EEPROM_CMD_RDSR 0x05 / Read Status Register Command#define EEPROM_CMD_WRSR 0x01 / Writ

10、e Status Register Commandsbit LED = P22; / LED=1 means ON/-/ Function Prototypes/-void PCA0_Init (void);void OSCILLATOR_Init (void);void PORT_Init (void);void TIMER2_Init (void);void UART0_Init (void);void SPI0_Init (void);void Init_Device (void);void Delay_us (BYTE time_us);void Delay_ms (BYTE time

11、_ms);void EEPROM_Write (UINT address, BYTE value);BYTE EEPROM_Read (UINT address);/-/ main() Routine/-void main (void) UINT address; / EEPROM address BYTE test_byte; / Used as a temporary variable Init_Device (); / Initializes hardware peripherals / The following code will test the EEPROM by perform

12、ing write/read/verify / operations. The first test will write 0xFFs to the EEPROM, and the / second test will write the LSBs of the EEPROM addresses. / Fill EEPROM with 0xFFs LED = 1; printf(Filling with 0xFFs.n); for (address = 0; address EEPROM_CAPACITY; address+) test_byte = 0xFF; EEPROM_Write (a

13、ddress, test_byte); / Print status to UART0 if (address % 16) = 0) printf (nWriting 0x%04x: %02x , address, (UINT)test_byte); LED = LED; else printf (%02x , (UINT)test_byte); / Verify EEPROM with 0xFFs printf(nnVerifying 0xFFs.n); for (address = 0; address EEPROM_CAPACITY; address+) test_byte = EEPR

14、OM_Read (address); / Print status to UART0 if (address % 16) = 0) printf (nVerifying 0x%04x: %02x , address, (UINT)test_byte); LED = LED; else printf (%02x , (UINT)test_byte); if (test_byte != 0xFF) LED = 0; printf (Error at %un, address); while (1); / Stop here on error (for debugging) / Fill EEPRO

15、M with LSB of EEPROM addresses printf(nnFilling with LSB of EEPROM addresses.n); for (address = 0; address EEPROM_CAPACITY; address+) test_byte = address & 0xFF; EEPROM_Write (address, test_byte); / Print status to UART0 if (address % 16) = 0) printf (nWriting 0x%04x: %02x , address, (UINT)test_byte

16、); LED = LED; else printf (%02x , (UINT)test_byte); / Verify EEPROM with LSB of EEPROM addresses printf(nnVerifying LSB of EEPROM addresses.n); for (address = 0; address clkmul/2)./-void OSCILLATOR_Init (void) int i = 0; CLKMUL = 0x80; for (i = 0; i 20; i+); / Wait 5us for initialization CLKMUL |= 0

17、xC0; while (CLKMUL & 0x20) = 0); CLKSEL = 0x02; OSCICN = 0x83;/-/ PORT_Init/-/ Return Value : None/ Parameters : None/ This function configures the crossbar and GPIO ports./ P0.0 - SCK (SPI0), Push-Pull, Digital/ P0.1 - MISO (SPI0), Open-Drain, Digital/ P0.2 - MOSI (SPI0), Push-Pull, Digital/ P0.3 -

18、 NSS (SPI0), Push-Pull, Digital/ P0.4 - TX0 (UART0), Push-Pull, Digital/ P0.5 - RX0 (UART0), Open-Drain, Digital/ P0.6 - Unassigned, Open-Drain, Digital/ P0.7 - Unassigned, Open-Drain, Digital/ P1.0 - Unassigned, Open-Drain, Digital/ P1.1 - Unassigned, Open-Drain, Digital/ P1.2 - Unassigned, Open-Dr

19、ain, Digital/ P1.3 - Unassigned, Open-Drain, Digital/ P1.4 - Unassigned, Open-Drain, Digital/ P1.5 - Unassigned, Open-Drain, Digital/ P1.6 - Unassigned, Open-Drain, Digital/ P1.7 - Unassigned, Open-Drain, Digital/ P2.0 - Skipped, Open-Drain, Digital (Switch S2 on Target Board)/ P2.1 - Skipped, Open-

20、Drain, Digital (Switch S3 on Target Board)/ P2.2 - Skipped, Push-Pull, Digital (LED D4 on Target Board)/ P2.3 - Skipped, Push-Pull, Digital (LED D2 on Target Board)/-void PORT_Init (void) P0MDOUT = 0x1D; P2MDOUT = 0x0C; P2SKIP = 0x0F; XBR0 = 0x03; XBR1 = 0x40;/-/ TIMER2_Init/-/ Return Value : None/ Parameters : None/ Initializes Timer2 to be clocked by SYSCLK for use as a delay timer./-void TIMER2_Init (void) CKCO