I2C_MODULE.rar_i2c_i2c master_i2c master vhdl_i2c vhdl

/* * "Hello World" example. * * This example prints 'Hello from Nios II' to the STDOUT stream. It runs on * the Nios II 'standard', 'full_featured', 'fast', and 'low_cost' example * designs. It runs with or without the MicroC/OS-II RTOS and requires a STDOUT * device in your system's hardware. * The memory footprint of this hosted application is ~69 kbytes by default * using the standard reference design. * * For a reduced footprint version of this template, and an explanation of how * to reduce the memory footprint for a given application, see the * "small_hello_world" template. * */ #include <stdio.h> #include "io.h" #include "system.h" #include "alt_types.h" alt_16 abc[100]; alt_u8 i; typedef struct { alt_u32 GO; alt_u32 OK; alt_u32 MODE; alt_u32 CNTDELTA; alt_u32 WRDAT; alt_u32 RDDAT; }I2C_STR; #define SLAVE_BASE I2C_ADS1115_BASE //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// #define SET_GO (IOWR(SLAVE_BASE,0,1)) #define CLR_GO (IOWR(SLAVE_BASE,0,0)) #define RESPOND_ST 0 #define RESPOND_TRANSMIT 1 #define RESPOND_OK 2 #define OK_RESPOND (IORD(SLAVE_BASE,1)) #define ST_MODE 1 #define TRANSMIT_MODE 2 #define END_MODE 3 #define SET_MODE(mode) (IOWR(SLAVE_BASE,2,mode)) #define CNT_100K 17179869 #define SET_CNTDELTA(cntdelta) (IOWR(SLAVE_BASE,3,cntdelta)) #define SET_WRDAT(wrdat) (IOWR(SLAVE_BASE,4,(wrdat<<1)+1)) #define SET_RDDAT (IOWR(SLAVE_BASE,4,0x1fe)) #define RD_DAT (IORD(SLAVE_BASE,5)) //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// #define slave_addr 0x48 /*********************************************************** * 产生一个开始信号 ***********************************************************/ void ST_I2C() { SET_MODE(ST_MODE); SET_GO; while(OK_RESPOND!=RESPOND_OK); CLR_GO; /* IOWR(I2C_ADS1115_BASE,2,1); IOWR(I2C_ADS1115_BASE,0,1); while(IORD(I2C_ADS1115_BASE,1)!=2); IOWR(I2C_ADS1115_BASE,0,0); */ } /*********************************************************** * 产生一个结束信号 ***********************************************************/ void END_I2C() { SET_MODE(END_MODE); SET_GO; while(OK_RESPOND!=RESPOND_OK); CLR_GO; SET_MODE(ST_MODE); while(OK_RESPOND!=RESPOND_ST); /* IOWR(I2C_ADS1115_BASE,2,3); IOWR(I2C_ADS1115_BASE,0,1); while(IORD(I2C_ADS1115_BASE,1)!=2); IOWR(I2C_ADS1115_BASE,0,0); IOWR(I2C_ADS1115_BASE,2,1); while(IORD(I2C_ADS1115_BASE,1)!=0); */ } /*********************************************************** * 发送八位数据，返回ACK ***********************************************************/ alt_u8 WR_I2C(alt_u16 wrdat) { alt_u8 ACK; SET_WRDAT(wrdat); SET_MODE(TRANSMIT_MODE); SET_GO; while(OK_RESPOND!=RESPOND_OK); ACK=RD_DAT&0X01; CLR_GO; while(OK_RESPOND!=RESPOND_ST); return ACK; /* alt_u8 ACK; IOWR(I2C_ADS1115_BASE,4,(wrdat<<1)+1); IOWR(I2C_ADS1115_BASE,2,2); IOWR(I2C_ADS1115_BASE,0,1); while(IORD(I2C_ADS1115_BASE,1)!=2); ACK=IORD(I2C_ADS1115_BASE,5)&0X01; IOWR(I2C_ADS1115_BASE,0,0); while(IORD(I2C_ADS1115_BASE,1)!=0); return ACK; */ } /*********************************************************** * 接收八位数据，响应ACK ***********************************************************/ alt_u8 RD_I2C() { alt_u8 dat; SET_RDDAT; SET_MODE(TRANSMIT_MODE); SET_GO; while(OK_RESPOND!=RESPOND_OK); dat=RD_DAT>>1; CLR_GO; while(OK_RESPOND!=RESPOND_ST); return dat; /* alt_u8 dat; IOWR(I2C_ADS1115_BASE,4,0x1fe); IOWR(I2C_ADS1115_BASE,2,2); IOWR(I2C_ADS1115_BASE,0,1); while(IORD(I2C_ADS1115_BASE,1)!=2); dat=IORD(I2C_ADS1115_BASE,5)>>1; IOWR(I2C_ADS1115_BASE,0,0); while(IORD(I2C_ADS1115_BASE,1)!=0); return dat; */ } //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// void WR_ADS1115(alt_u8 addr,alt_u16 dat) { alt_u8 ACK=0; do { ACK=0; ST_I2C(); ACK|=(WR_I2C(slave_addr<<1)); ACK|=WR_I2C(addr); ACK|=WR_I2C((dat>>8)); ACK|=WR_I2C(dat); END_I2C(); }while(ACK); } alt_16 RD_ADS1115(alt_u8 addr) { alt_u8 ACK=0; alt_16 dat; do { ACK=0; ST_I2C(); ACK|=(WR_I2C(slave_addr<<1)); ACK|=WR_I2C(addr); END_I2C(); ST_I2C(); ACK|=(WR_I2C((slave_addr<<1)+1)); dat=RD_I2C(); dat=(dat<<8)+RD_I2C(); END_I2C(); // delay(10); }while(ACK); return dat; } void ads1115_init() { CLR_GO; SET_MODE(ST_MODE); SET_CNTDELTA(CNT_100K*10); //1MHz WR_ADS1115(0x01,0xc083); WR_ADS1115(0x02,0x4444); WR_ADS1115(0x03,0x5555); /* IOWR(I2C_ADS1115_BASE,0,0); IOWR(I2C_ADS1115_BASE,2,1); IOWR(I2C_ADS1115_BASE,3,17179869.184*10); WR_ADS1115(0x01,0xc083); WR_ADS1115(0x02,0x4444); WR_ADS1115(0x03,0x5555); */ } int main() { i=0; printf("Hello from Nios II!\n"); IOWR(CNTMAX_BASE,0,4); IOWR(LED_BASE,0,0XAA); ads1115_init(); IOWR(LED_BASE,0,0X01); while(1) { printf("%d\t ",RD_ADS1115(0)); printf("%x\t ",RD_ADS1115(1)); printf("%x\t ",RD_ADS1115(2)); printf("%x\t ",RD_ADS1115(3)); printf("\n"); delay(1000000); } return 0; }