| 29,7 → 29,7 |
|---|
| } |
| |
| // Setup the PIC to operate as a master. |
| void I2C_Configure_Master() { |
| void I2C_Configure_Master(unsigned char speed) { |
| i2c_data.operating_mode = I2C_MODE_MASTER; |
| |
| TRISCbits.TRISC3 = 1; |
| 39,7 → 39,11 |
|---|
| SSPCON1 = 0x0; |
| SSPCON2 = 0x0; |
| SSPCON1bits.SSPM = 0x8; // I2C Master Mode |
| SSPADD = 0x77; // Operate at 100KHz (48MHz) |
| if (speed) { |
| SSPADD = 0x74; // Operate at 100KHz (48MHz) |
| } else { |
| SSPADD = 0x1A; // Operate at 400KHz (48MHz) |
| } |
| SSPSTATbits.SMP = 1; // Disable Slew Rate Control |
| SSPCON1bits.SSPEN = 1; // Enable MSSP Module |
| } |
| 57,6 → 61,7 |
|---|
| i2c_data.buffer_in_len = length; |
| i2c_data.master_dest_addr = address; |
| i2c_data.buffer_in_read_ind = 0; |
| i2c_data.buffer_in_write_ind = 0; |
| |
| // Change status to 'next' operation |
| i2c_data.operating_state = I2C_SEND_ADDR; |
| 75,6 → 80,7 |
|---|
| i2c_data.buffer_in_len = length; |
| i2c_data.master_dest_addr = address; |
| i2c_data.buffer_in_read_ind = 0; |
| i2c_data.buffer_in_write_ind = 0; |
| |
| // Change status to 'next' operation |
| i2c_data.operating_state = I2C_SEND_ADDR; |
| 98,6 → 104,7 |
|---|
| i2c_data.buffer_in_len = length; |
| i2c_data.master_dest_addr = address; |
| i2c_data.buffer_in_read_ind = 0; |
| i2c_data.buffer_in_write_ind = 0; |
| |
| // Change status to 'next' operation |
| i2c_data.operating_state = I2C_SEND_ADDR; |
| 196,9 → 203,10 |
|---|
| break; |
| case I2C_RCV_DATA: |
| // On receive, save byte into buffer |
| i2c_data.buffer_in[i2c_data.buffer_in_read_ind] = SSPBUF; |
| i2c_data.buffer_in_read_ind++; |
| if (i2c_data.buffer_in_read_ind < i2c_data.buffer_in_len) { |
| // TODO: handle i2c buffer overflow |
| i2c_data.buffer_in[i2c_data.buffer_in_write_ind] = SSPBUF; |
| i2c_data.buffer_in_write_ind++; |
| if (i2c_data.buffer_in_write_ind < i2c_data.buffer_in_len) { |
| // If we still need to read, send an ACK to the slave |
| i2c_data.operating_state = I2C_REQ_DATA; |
| SSPCON2bits.ACKDT = 0; // ACK |
| 279,9 → 287,10 |
|---|
| break; |
| case I2C_RCV_DATA: |
| // On receive, save byte into buffer |
| i2c_data.buffer_in[i2c_data.buffer_in_read_ind] = SSPBUF; |
| i2c_data.buffer_in_read_ind++; |
| if (i2c_data.buffer_in_read_ind < i2c_data.buffer_in_len) { |
| // TODO: handle i2c buffer overflow |
| i2c_data.buffer_in[i2c_data.buffer_in_write_ind] = SSPBUF; |
| i2c_data.buffer_in_write_ind++; |
| if (i2c_data.buffer_in_write_ind < i2c_data.buffer_in_len) { |
| // If we still need to read, send an ACK to the slave |
| i2c_data.operating_state = I2C_REQ_DATA; |
| SSPCON2bits.ACKDT = 0; // ACK |
| 317,7 → 326,7 |
|---|
| |
| // Clear SSPOV (overflow bit) |
| if (SSPCON1bits.SSPOV == 1) { |
| // DBG_PRINT_I2C("I2C: overflow detected\r\n"); |
| DBG_PRINT_I2C("I2C: overflow detected\r\n"); |
| SSPCON1bits.SSPOV = 0; |
| // We failed to read the buffer in time, so we know we |
| // can't properly receive this message, just put us in the |
| 330,7 → 339,7 |
|---|
| // Read SPPxBUF if it is full |
| if (SSPSTATbits.BF == 1) { |
| received_data = SSPBUF; |
| // DBG_PRINT_I2C("I2C: data read from buffer: %x\r\n", SSPBUF); |
| DBG_PRINT_I2C("I2C: data read from buffer: %x\r\n", SSPBUF); |
| data_read_from_buffer = 1; |
| } |
| |
| 344,7 → 353,7 |
|---|
| i2c_data.operating_state = I2C_STARTED; |
| // if (data_read_from_buffer) { |
| // if (SSPSTATbits.D_A == 1) { |
| //// DBG_PRINT_I2C("I2C Start: (ERROR) no address recieved\r\n"); |
| // DBG_PRINT_I2C("I2C Start: (ERROR) no address recieved\r\n"); |
| // // This is bad because we got data and we wanted an address |
| // i2c_data.operating_state = I2C_IDLE; |
| // i2c_data.return_status = I2C_ERR_NOADDR; |
| 381,7 → 390,7 |
|---|
| goto send; |
| } |
| } else { |
| // DBG_PRINT_I2C("I2C: (ERROR) no data recieved\r\n"); |
| DBG_PRINT_I2C("I2C: (ERROR) no data recieved\r\n"); |
| i2c_data.operating_state = I2C_IDLE; |
| i2c_data.return_status = I2C_ERR_NODATA; |
| } |
| 426,6 → 435,7 |
|---|
| if (data_read_from_buffer) { |
| if (SSPSTATbits.D_A == 1) { |
| // Data received with stop bit |
| // TODO: handle i2c buffer overflow |
| i2c_data.buffer_in[i2c_data.buffer_in_write_ind] = received_data; |
| if (i2c_data.buffer_in_write_ind == MAXI2CBUF-1) { |
| i2c_data.buffer_in_write_ind = 0; |
| 437,7 → 447,7 |
|---|
| i2c_data.slave_in_last_byte = received_data; |
| i2c_data.return_status = I2C_DATA_AVAL; |
| } else { |
| // DBG_PRINT_I2C("I2C: (ERROR) no data recieved\r\n"); |
| DBG_PRINT_I2C("I2C: (ERROR) no data recieved\r\n"); |
| i2c_data.operating_state = I2C_IDLE; |
| i2c_data.return_status = I2C_ERR_NODATA; |
| } |
| 466,7 → 476,7 |
|---|
| goto send; |
| } else { |
| // Bad to recv an address again, we aren't ready |
| // DBG_PRINT_I2C("I2C: (ERROR) no data recieved\r\n"); |
| DBG_PRINT_I2C("I2C: (ERROR) no data recieved\r\n"); |
| i2c_data.operating_state = I2C_IDLE; |
| i2c_data.return_status = I2C_ERR_NODATA; |
| } |
| 503,6 → 513,10 |
|---|
| } |
| } |
| |
| unsigned char I2C_Buffer_Len() { |
| return i2c_data.buffer_in_len; |
| } |
| |
| /* Returns 0 if I2C module is currently busy, otherwise returns buffer length */ |
| unsigned char I2C_Read_Buffer(char *buffer) { |
| unsigned char i = 0; |