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106 lines
3.0 KiB
106 lines
3.0 KiB
15 years ago
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// read and write eeprom of PIC18F2550 (and 18F2455, 18F4455, 18F4550)
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// EEPROM size is 256 bytes
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// (c) Raphael Wimmer. Licensed under GNU GPL v2 or higher
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#include <pic18f452.h>
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//#include <pic18fregs.h>
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#include <stdio.h>
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#include <usart.h>
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#include <adc.h>
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code char at __CONFIG1H config1h = 0xFF & _OSC_XT_1H & _OSCS_OFF_1H;
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code char at __CONFIG2L config2l = 0xFF & _PUT_ON_2L & _BODEN_OFF_2L & _BODENV_2_7V_2L;
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code char at __CONFIG2H config2h = 0xFF & _WDT_OFF_2H;
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code char at __CONFIG3H config3h = 0xFF & _CCP2MUX_RC1_3H;
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code char at __CONFIG4L config4l = 0xFF & _LVP_OFF_4L & _BACKBUG_ON_4L & _STVR_OFF_4L;
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code char at __CONFIG5L config5l = 0xFF & _CP_0_OFF_5L & _CP_1_OFF_5L;
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code char at __CONFIG5H config5h = 0xFF & _CPD_OFF_5H & _CPB_OFF_5H;
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code char at __CONFIG6L config6l = 0xFF & _WRT_0_OFF_6L & _WRT_1_OFF_6L;
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code char at __CONFIG6H config6h = 0xFF & _WRTD_OFF_6H & _WRTB_OFF_6H & _WRTC_OFF_6H;
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code char at __CONFIG7L config7l = 0xFF & _EBTR_0_OFF_7L & _EBTR_1_OFF_7L;
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code char at __CONFIG7H config7h = 0xFF & _EBTRB_OFF_7H;
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#pragma stack 0x300 0xff // set 64 byte stack at 0x300, needed by sdcc
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static void isr(void) interrupt 1 {
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/*
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n Interrupt Vector Interrupt Vector Address
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0 RESET vector 0x000000
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1 HIGH priority interrupts 0x000008
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2 LOW priority interrupts 0x000018
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*/
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}
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void ee_write_byte(unsigned char address, unsigned char *_data){
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EEDATA = *_data;
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EEADR = address;
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// start write sequence as described in datasheet, page 91
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EECON1bits.EEPGD = 0;
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EECON1bits.CFGS = 0;
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EECON1bits.WREN = 1; // enable writes to data EEPROM
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INTCONbits.GIE = 0; // disable interrupts
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EECON2 = 0x55;
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EECON2 = 0x0AA;
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EECON1bits.WR = 1; // start writing
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while(EECON1bits.WR){
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_asm nop _endasm;}
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if(EECON1bits.WRERR){
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// printf("ERROR: writing to EEPROM failed!\n");
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}
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EECON1bits.WREN = 0;
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INTCONbits.GIE = 1; // enable interrupts
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}
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void adc_start() {
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adc_open(ADC_CHN_1, ADC_FOSC_4, ADC_CFG_5A_0R, ADC_FRM_RJUST);
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while (adc_busy()) ;
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adc_read();
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//unsigned char channel, unsigned char fosc, unsigned char pcfg, unsigned char config
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}
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void ee_read_byte(unsigned char address, unsigned char *_data){
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EEADR = address;
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EECON1bits.CFGS = 0;
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EECON1bits.EEPGD = 0;
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EECON1bits.RD = 1;
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*_data = EEDATA;
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}
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void initUsart()
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{
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usart_open( // Use USART library to initialise the hardware
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USART_TX_INT_OFF
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& USART_RX_INT_OFF
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& USART_BRGH_HIGH
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& USART_ASYNCH_MODE
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& USART_EIGHT_BIT,
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10 // '10' = 115200 Baud with 20 MHz oscillator and BRGH=1
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);
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stdout = STREAM_USART;
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}
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// very simple example. use on an erased eeprom
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void main(){
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char save_me = 'c';
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char from_eeprom;
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adc_start();
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initUsart();
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printf("E");
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ee_read_byte(0x00, &from_eeprom);
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printf("%c", from_eeprom);
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ee_write_byte(0x00, &save_me);
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printf("%c", save_me);
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ee_read_byte(0x00, &from_eeprom);
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printf("%c", from_eeprom);
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while (1){}
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}
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