C언어,ARM
i2c - AT24C16
안녕1999
2020. 2. 15. 23:33
#include "..\src\sI2C.h" #include "..\src\cpu.h" #ifndef I2C_MSB_first #define I2C_MSB_first #endif #ifdef I2C_MSB_first #define for_loop8(i) for(i=7;i>=0;i--) #else #define for_loop8(i) for(i=0;i<=7;i++) #endif #ifndef SCL_H #define SCL_H() I2C_CLK_H() #define SCL_L() I2C_CLK_L() #endif #ifndef SDA_H #define SDA_H() I2C_DATA_H() #define SDA_L() I2C_DATA_L() #endif void SCL_set_IN(void) { GPIO_InitTypeDef GPIO_InitStruct; //GPIO-IN GPIO_InitStruct.Mode = GPIO_MODE_INPUT; GPIO_InitStruct.Pull = GPIO_PULLUP; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH; GPIO_InitStruct.Pin = GPIO_PIN_9;//I2C_CLK HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); } void SCL_set_OUT(void) { GPIO_InitTypeDef GPIO_InitStruct; //GPIO-OUT GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_PULLUP; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH; GPIO_InitStruct.Pin = GPIO_PIN_9;//I2C_CLK HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); } void SDA_set_IN(void) { GPIO_InitTypeDef GPIO_InitStruct; //GPIO-IN GPIO_InitStruct.Mode = GPIO_MODE_INPUT; GPIO_InitStruct.Pull = GPIO_PULLUP; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH; GPIO_InitStruct.Pin = GPIO_PIN_2;//I2C_DATA HAL_GPIO_Init(GPIOB, &GPIO_InitStruct); } void SDA_set_OUT(void) { GPIO_InitTypeDef GPIO_InitStruct; //GPIO-OUT GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_PULLUP; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH; GPIO_InitStruct.Pin = GPIO_PIN_2;//I2C_DATA HAL_GPIO_Init(GPIOB, &GPIO_InitStruct); } extern void delay_us(int n); extern void delay_nsec(byte1 n); void I2C_delay(void) { delay_nsec(1); } void sI2C_init(void) { //DEBUG_UART_puts_rn("sI2C_init()"); SCL_set_OUT(); SDA_set_OUT(); SCL_H(); SDA_H(); I2C_delay(); } void sI2C_START(void) { //DEBUG_puts("sI2C_START()"); sI2C_init(); SDA_L(); I2C_delay(); SCL_L(); I2C_delay(); } void sI2C_STOP(void) { SDA_L(); I2C_delay(); SCL_H(); I2C_delay(); SDA_H(); I2C_delay(); //DEBUG_puts("sI2C_STOP()"); } int sI2C_read_ACK(void) { int bok; //DEBUG_puts("sI2C_read_ACK()"); SDA_H(); I2C_delay(); SDA_set_IN(); SCL_H(); I2C_delay(); bok=SDA_get(); SCL_L(); I2C_delay(); SDA_set_OUT(); SDA_H(); //DEBUG_puts_int("ACK(0)/NACK(1)",bok); return bok; } void sI2C_SCL_H_L(void) { //DEBUG_UART_puts_rn("sI2C_SCL_H_L()"); SCL_H(); I2C_delay(); SCL_L(); I2C_delay(); } int sI2C_wait_ACK(void) { //DEBUG_UART_puts_rn("DEBUG : sI2C_wait_ACK()=ACK"); //return 0;//DEBUG 무조건 ACK int bok=0,n=0x0fff; //DEBUG_UART_puts_rn("sI2C_wait_ACK()"); //DEBUG_printf(("sI2C_wait_ACK()")); SDA_H(); //I2C_delay(); SDA_set_IN(); while(n--) { I2C_delay(); bok=SDA_get(); //bok=0;//DEBUG 무조건 ACK if(bok==0) { //ACK(OK) break; } } //_UART_HEX_puts(&n,sizeof(n),"sI2C_wait_ACK(n)"); sI2C_SCL_H_L(); SDA_set_OUT(); SDA_H(); //DEBUG_UART_puts_rn("sI2C_wait_ACK() END"); //return 0;//DEBUG 무조건 ACK return bok; } void sI2C_write_1bit(int a) { //DEBUG_UART_puts_rn("sI2C_write_1bit()"); if(a) { SDA_H(); //DEBUG_UART_puts_rn("SDA_H()"); } else { SDA_L(); //DEBUG_UART_puts_rn("SDA_L()"); } I2C_delay(); sI2C_SCL_H_L(); //SDA 기본상태는 L I2C_delay(); SDA_L(); } #define write_ACK(psI2C) sI2C_write_1bit(0) #define write_NACK(psI2C) sI2C_write_1bit(1) byte1 sI2C_read_byte(int ack) { int i; byte1 a=0; //DEBUG_UART_puts_rn("sI2C_read_byte()"); //DEBUG_printf(("sI2C_read_byte()")); SDA_H(); SDA_set_IN(); for_loop8(i) { I2C_delay(); SCL_H(); I2C_delay(); a|=(SDA_get()<<i); SCL_L(); I2C_delay(); } SDA_set_OUT(); sI2C_write_1bit(ack); //DEBUG_printf(("sI2C_read_byte()=%d(0x%X) ACK=%d\r\n",a,a,ack)); //_UART_HEX_puts(&a,sizeof(a),"sI2C_read_byte()"); //DEBUG_puts_int("sI2C_read_byte() END a",a); return a; } void sI2C_read(byte1 *pbuf,int len) { int rlen=len; byte1 *p=pbuf; //DEBUG_UART_puts_rn("sI2C_read() START"); while(len--) { *p=sI2C_read_byte(len==0); p++; } //UART3_send_value_HEX("sI2C_read",pbuf,rlen);//DEBUG //DEBUG_UART_puts_rn("sI2C_read() END"); //DEBUG_HEX_puts("sI2C_read",pbuf,rlen);//DEBUG } void sI2C_write_byte(byte1 a) { int i; //DEBUG_UART_puts_rn("sI2C_write_byte()"); //_UART_HEX_puts(&a,sizeof(a),"sI2C_write_byte"); //DEBUG_printf(("sI2C_write_byte=%d(0x%X)",a,a)); for_loop8(i) { if(gbi(a,i)) { SDA_H(); } else { SDA_L(); } I2C_delay(); sI2C_SCL_H_L(); } } int sI2C_write(byte1 *pbuf,int len) { byte1 *p=pbuf; int wlen=0; //DEBUG_UART_puts_rn("sI2C_write()"); //DEBUG_puts_int("len",len); //WDT_reset();//DEBUG while(len--) { sI2C_write_byte(*p); //ACK if(sI2C_wait_ACK()) { //DEBUG_puts("ERR : sI2C_wait_ACK");//DEBUG break;//err } else { //ok } wlen++; p++; } //SDA_H(); //UART3_send_value_HEX("sI2C_write()1",pbuf,wlen);//DEBUG //DEBUG_HEX_puts("sI2C_write",pbuf,wlen);//DEBUG return wlen; } int sI2C_write_START_device_addr1(byte1 device,byte1 addr1) { //DEBUG_UART_puts_rn("sI2C_write_START_device_addr1()"); sI2C_START(); sI2C_write(&device,1); sI2C_write(&addr1,1); return 1; } int sI2C_write_START_device_addr1_STOP(byte1 device,byte1 addr1) { int bok; //DEBUG_UART_puts_rn("sI2C_write_START_device_addr1_STOP()"); bok=sI2C_write_START_device_addr1(device,addr1); sI2C_STOP(); return bok; }