ADS1282驱动程序

#include "..\h\ads1282.h" /* array to save ADC configuration data */ unsigned char adc_regdata[11]; /**************************************************************************** * Function Name : write_CMD * * Description : write a byte to SPI then read a byte from SPI * * Parameters : unsigned char CMD: command suppose to write * * * * Return Value : unsigned char Data received * ****************************************************************************/ unsigned char write_CMD(unsigned char CMD) { /* Send command */ WriteSPI1(CMD); while(!DataRdySPI1()) { continue; } return(ReadSPI1()); /* read SPI RX registe and clear DataRdyADC bit */ } /**************************************************************************** * Function Name : read_ADC_REG * * Description : read ADC internal register value * * Parameters : unsigned int start_addr: address in ADC register * * unsigned int length: length to be readed (byte) * * unsigned char *rdptr: the received data to be * * recorded to this array * * Return Value : unsigned int number of data bytes yet to be received * ****************************************************************************/ void read_ADC_REG(unsigned int start_addr, unsigned int length, unsigned char *rdptr) { unsigned char command1; unsigned char command2; /* Send Read Register command */ command1 = 0x20 + (0x1F & start_addr); command2 = 0x00 + (0x1F & (length - 1)); /* send command1 */ write_CMD(command1); DELAY_FCLK(24); /* 24 f_CLK cycles required between each byte transaction */ /* send command2 */ write_CMD(command2); /* read byte number = length */ while(length) /* stay in loop until length = 0 */ { DELAY_FCLK(24); *rdptr++ = write_CMD(0x00); /* read a single byte */ length--; /* reduce string length count by 1*/ } } /**************************************************************************** * Function Name : write_ADC_REG * * Description : write ADC internal register value * * Parameters : unsigned int start_addr: address in ADC register * * unsigned int length: the length of data * * unsigned char *rdptr: the data to be transfered * * recorded in this array * * Return Value : * ****************************************************************************/ void write_ADC_REG(unsigned int start_addr, unsigned int length, unsigned char *wtptr) { unsigned char command1; unsigned char command2; /* Send Read Register command */ command1 = 0x40 + (0x1F & start_addr); command2 = 0x00 + (0x1F & (length - 1)); /* send command1 */ write_CMD(command1); DELAY_FCLK(24); /* 24 f_CLK cycles required between each byte transaction */ /* send command2 */ write_CMD(command2); /* write byte number = length */ while(length) /* stay in loop until length = 0 */ { DELAY_FCLK(24); write_CMD(*wtptr++); length--; /* reduce string length count by 1*/ } } /**************************************************************************** * Function Name : read_ADC_DATA * * Description : read ADC value in Read Data By Command mode * * Parameters : unsigned int ADC_data_wait: time out cycle * * Return Value : unsigned long int Data received * ****************************************************************************/ unsigned long int read_ADC_DATA(unsigned int ADC_data_wait) { unsigned int wait = 0; unsigned long int temp_read = 0; /* temporary variable for saving read data */ unsigned char i; /* Send Read Data command */ write_CMD(ADC_RDATA); while(!DRDY_ADC) { if(!ADC_data_wait || wait < ADC_data_wait) /* ADC_data_wait = 0: disable timeout */ wait++ ; /* wait for time out operation */ else return(-1); /* Time out, return 0xffffffff */ } /* Read Data */ for(i = 0;i < 4;i++) /* save 4 bytes to one long int */ { temp_read <<= 8; temp_read += write_CMD(0x00); } return(temp_read); } /**************************************************************************** * Function Name : calibration_ADC * * Description : ADC offset or gain calibration command * * Parameters : unsigned int CAL_CMD: ADC_OFSCAL or ADC_GANCAL * * 0 = offset calibration, 1 = gain calibration * * unsigned in ADC_data_wait: time out cycle, 0 diable * * Return Value : unsigned long int Data received * ****************************************************************************/ signed int calibration_ADC(unsigned int CAL_CMD,unsigned int ADC_data_wait) { unsigned int wait = 0; write_CMD(ADC_SDATAC); /* send Stop Read Data Continuous command */ DELAY_FCLK(24); write_CMD(ADC_SYNC); /* send Synchronize command */ DELAY_FCLK(24); write_CMD(ADC_RDATAC); /* send Read Data Continuous command */ while(!DRDY_ADC) { if(!ADC_data_wait || wait < ADC_data_wait) wait++ ; /* wait for time out operation */ else return(-1); /* Time out, return 0xff */ } write_CMD(ADC_SDATAC); DELAY_FCLK(24); if(!CAL_CMD) write_CMD(ADC_OFSCAL); else write_CMD(ADC_GANCAL); DELAY_FCLK(24); write_CMD(ADC_RDATAC); return(0); } /**************************************************************************** * Function Name : read_ADC_ALLREG * * Description : read all ADC value and save it to array * * Parameters : * * Return Value : * ****************************************************************************/ void read_ADC_ALLREG(void) { /* send stop read data continuous mode command */ write_CMD(ADC_SDATAC); DELAY_FCLK(24); read_ADC_REG(ADC_ADDR_ID,11,adc_regdata); DELAY_FCLK(24); write_CMD(ADC_RDATAC); } /**************************************************************************** * Function Name : ADC_configuration * * Description : configuration the ADC internal register * * Parameters : * * Return Value : * ****************************************************************************/ void ADC_configuration(void) { unsigned char ADC_CFG[10]; ADC_CFG[0] = ADC_SYNC_P & ADC_MODE_H & ADC_RATE_1000 & ADC_FIR_LIN & ADC_FILTER_SINC_LPF; ADC_CFG[1] = ADC_MUX_2 & ADC_CHOP_EN & ADC_GAIN_1; /* send stop read data continuous mode command */ write_CMD(ADC_SDATAC); DELAY_FCLK(24); write_ADC_REG(ADC_ADDR_CFG0,2,ADC_CFG); DELAY_FCLK(24); write_CMD(ADC_RDATAC); DELAY_FCLK(24); } /* EOF */