| 40,6 → 40,7 |
|---|
| } |
| |
| // Sends length number of bytes in msg to specified address (no R/W bit) |
| // Will return status I2C1_SEND_OK or I2C1_SEND_FAIL |
| void I2C1_Master_Send(uint8_t address, uint8_t *msg, uint32_t length) { |
| uint32_t i; |
| if (length == 0) |
| 63,6 → 64,7 |
|---|
| } |
| |
| // Reads length number of bytes from address (no R/W bit) |
| // Will return status I2C1_RECV_OK or I2C1_RECV_FAIL |
| void I2C1_Master_Recv(uint8_t address, uint32_t length) { |
| if (length == 0) |
| return; |
| 82,6 → 84,7 |
|---|
| } |
| |
| // Writes msg to address then reads length number of bytes from address |
| // Will return status I2C1_SEND_FAIL or I2C1_RECV_FAIL or I2C1_RECV_OK |
| void I2C1_Master_Restart(uint8_t address, uint8_t msg, uint32_t length) { |
| uint8_t c; |
| if (length == 0) { |
| 137,6 → 140,11 |
|---|
| * 7. During a slave-detected stop |
| */ |
| |
| if (I2C1STATbits.IWCOL == 1) { |
| // TODO: Handle write collisions |
| I2C1STATbits.IWCOL = 0; |
| } |
| |
| // If we are in the middle of sending data |
| if (i2c_data_p->master_status == I2C1_MASTER_SEND) { |
| switch (i2c_data_p->operating_state) { |
| 156,19 → 164,21 |
|---|
| i2c_data_p->buffer_in_read_ind++; |
| } else { |
| // If no more data is to be sent, send stop bit |
| i2c_data_p->operating_state = I2C1_IDLE; |
| i2c_data_p->operating_state = I2C1_STOPPED; |
| I2C1CONbits.PEN = 1; |
| i2c_data_p->master_status = I2C1_MASTER_IDLE; |
| i2c_data_p->return_status = I2C1_SEND_OK; |
| } |
| } else { |
| // If a NACK is received, stop transmission and send error |
| i2c_data_p->operating_state = I2C1_IDLE; |
| i2c_data_p->operating_state = I2C1_STOPPED; |
| I2C1CONbits.PEN = 1; |
| i2c_data_p->master_status = I2C1_MASTER_IDLE; |
| i2c_data_p->return_status = I2C1_SEND_FAIL; |
| } |
| break; |
| case I2C1_STOPPED: |
| i2c_data_p->operating_state = I2C1_IDLE; |
| i2c_data_p->master_status = I2C1_MASTER_IDLE; |
| break; |
| } |
| // If we are in the middle of receiving data |
| } else if (i2c_data_p->master_status == I2C1_MASTER_RECV) { |
| 188,15 → 198,14 |
|---|
| I2C1CONbits.RCEN = 1; |
| } else { |
| // If a NACK is received, stop transmission and send error |
| i2c_data_p->operating_state = I2C1_IDLE; |
| i2c_data_p->operating_state = I2C1_STOPPED; |
| I2C1CONbits.PEN = 1; |
| i2c_data_p->master_status = I2C1_MASTER_IDLE; |
| i2c_data_p->return_status = I2C1_RECV_FAIL; |
| } |
| break; |
| case I2C1_RCV_DATA: |
| // On receive, save byte into buffer |
| // TODO: Handle I2C buffer overflow |
| // TODO: Handle possible I2C buffer overflow |
| i2c_data_p->buffer_in[i2c_data_p->buffer_in_write_ind] = I2C1RCV; |
| i2c_data_p->buffer_in_write_ind++; |
| if (i2c_data_p->buffer_in_write_ind < i2c_data_p->buffer_in_len) { |
| 217,12 → 226,15 |
|---|
| I2C1CONbits.RCEN = 1; |
| break; |
| case I2C1_SEND_STOP: |
| // Send the stop bit and copy message to send to Main() |
| i2c_data_p->operating_state = I2C1_IDLE; |
| // Send the stop bit |
| i2c_data_p->operating_state = I2C1_STOPPED; |
| I2C1CONbits.PEN = 1; |
| i2c_data_p->master_status = I2C1_MASTER_IDLE; |
| i2c_data_p->return_status = I2C1_RECV_OK; |
| break; |
| case I2C1_STOPPED: |
| i2c_data_p->operating_state = I2C1_IDLE; |
| i2c_data_p->master_status = I2C1_MASTER_IDLE; |
| break; |
| } |
| } else if (i2c_data_p->master_status == I2C1_MASTER_RESTART) { |
| switch (i2c_data_p->operating_state) { |
| 241,9 → 253,8 |
|---|
| i2c_data_p->operating_state = I2C1_CHECK_ACK_RESTART; |
| } else { |
| // If a NACK is received, stop transmission and send error |
| i2c_data_p->operating_state = I2C1_IDLE; |
| i2c_data_p->operating_state = I2C1_STOPPED; |
| I2C1CONbits.PEN = 1; |
| i2c_data_p->master_status = I2C1_MASTER_IDLE; |
| i2c_data_p->return_status = I2C1_SEND_FAIL; |
| } |
| break; |
| 253,9 → 264,8 |
|---|
| i2c_data_p->operating_state = I2C1_SEND_ADDR_2; |
| } else { |
| // If a NACK is received, stop transmission and send error |
| i2c_data_p->operating_state = I2C1_IDLE; |
| i2c_data_p->operating_state = I2C1_STOPPED; |
| I2C1CONbits.PEN = 1; |
| i2c_data_p->master_status = I2C1_MASTER_IDLE; |
| i2c_data_p->return_status = I2C1_SEND_FAIL; |
| } |
| break; |
| 272,15 → 282,14 |
|---|
| I2C1CONbits.RCEN = 1; |
| } else { |
| // If a NACK is received, stop transmission and send error |
| i2c_data_p->operating_state = I2C1_IDLE; |
| i2c_data_p->operating_state = I2C1_STOPPED; |
| I2C1CONbits.PEN = 1; |
| i2c_data_p->master_status = I2C1_MASTER_IDLE; |
| i2c_data_p->return_status = I2C1_RECV_FAIL; |
| } |
| break; |
| case I2C1_RCV_DATA: |
| // On receive, save byte into buffer |
| // TODO: Handle I2C buffer overflow |
| // TODO: Handle possible I2C buffer overflow |
| i2c_data_p->buffer_in[i2c_data_p->buffer_in_write_ind] = I2C1RCV; |
| i2c_data_p->buffer_in_write_ind++; |
| if (i2c_data_p->buffer_in_write_ind < i2c_data_p->buffer_in_len) { |
| 301,12 → 310,15 |
|---|
| I2C1CONbits.RCEN = 1; |
| break; |
| case I2C1_SEND_STOP: |
| // Send the stop bit and copy message to send to Main() |
| i2c_data_p->operating_state = I2C1_IDLE; |
| // Send the stop bit |
| i2c_data_p->operating_state = I2C1_STOPPED; |
| I2C1CONbits.PEN = 1; |
| i2c_data_p->master_status = I2C1_MASTER_IDLE; |
| i2c_data_p->return_status = I2C1_RECV_OK; |
| break; |
| case I2C1_STOPPED: |
| i2c_data_p->operating_state = I2C1_IDLE; |
| i2c_data_p->master_status = I2C1_MASTER_IDLE; |
| break; |
| } |
| } |
| } |
| 399,11 → 411,12 |
|---|
| |
| /* Returns 0 if I2C module is currently busy, otherwise returns status code */ |
| uint8_t I2C1_Get_Status() { |
| if (i2c_data_p->master_status != I2C1_MASTER_IDLE || |
| i2c_data_p->buffer_in_len == 0) { |
| if (i2c_data_p->master_status == I2C1_MASTER_IDLE && |
| i2c_data_p->operating_state == I2C1_IDLE && |
| I2C1STATbits.TBF == 0) { |
| return i2c_data_p->return_status; |
| } else { |
| return 0; |
| } else { |
| return i2c_data_p->return_status; |
| } |
| } |
| |