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i2c.h
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22 
30 #ifndef MCU_PERIPH_I2C_H
31 #define MCU_PERIPH_I2C_H
32 
33 #include "std.h"
34 
35 #include "mcu_periph/i2c_arch.h"
36 
50 };
51 
60 };
61 
65 enum I2CStatus {
71  /* I2CSendingLastByte, */
78 };
79 
83 #ifndef I2C_BUF_LEN
84 #define I2C_BUF_LEN 32
85 #endif
86 
99 
105 
111 
117 
123 
127 };
128 
132 #ifndef I2C_TRANSACTION_QUEUE_LEN
133 #define I2C_TRANSACTION_QUEUE_LEN 8
134 #endif
135 
138 struct i2c_periph;
139 typedef bool i2c_idle_fn_t(struct i2c_periph *p);
140 typedef bool i2c_submit_fn_t(struct i2c_periph *p, struct i2c_transaction *t);
141 typedef void i2c_setbitrate_fn_t(struct i2c_periph *p, int bitrate);
142 typedef void i2c_spin_fn_t(struct i2c_periph *p); // To update peripherals within tight loops, e.g. the blocking functions. Leave NULL if not required.
143 
144 struct i2c_periph {
145  /* architecture-specific functions */
150  /* circular buffer holding transactions */
154  /* internal state of the peripheral */
155  volatile enum I2CStatus status;
156  volatile uint8_t idx_buf;
157  void *reg_addr;
158  void *init_struct;
160  volatile int16_t watchdog;
161 };
162 
165 struct i2c_errors {
178 };
179 
180 
181 #define ZEROS_ERR_COUNTER(_i2c_err) { \
182  _i2c_err.wd_reset_cnt = 0; \
183  _i2c_err.queue_full_cnt = 0; \
184  _i2c_err.ack_fail_cnt = 0; \
185  _i2c_err.miss_start_stop_cnt = 0; \
186  _i2c_err.arb_lost_cnt = 0; \
187  _i2c_err.over_under_cnt = 0; \
188  _i2c_err.pec_recep_cnt = 0; \
189  _i2c_err.timeout_tlow_cnt = 0; \
190  _i2c_err.smbus_alert_cnt = 0; \
191  _i2c_err.unexpected_event_cnt = 0; \
192  _i2c_err.last_unexpected_event = 0; \
193  _i2c_err.er_irq_cnt = 0; \
194  }
195 
196 
197 #if USE_I2C0
198 
199 extern struct i2c_periph i2c0;
200 extern void i2c0_init(void);
201 
202 #endif /* USE_I2C0 */
203 
204 
205 #if USE_I2C1
206 
207 extern struct i2c_periph i2c1;
208 extern void i2c1_init(void);
209 
210 #endif /* USE_I2C1 */
211 
212 
213 #if USE_I2C2
214 
215 extern struct i2c_periph i2c2;
216 extern void i2c2_init(void);
217 
218 #endif /* USE_I2C2 */
219 
220 
221 #if USE_I2C3
222 
223 extern struct i2c_periph i2c3;
224 extern void i2c3_init(void);
225 
226 #endif /* USE_I2C3 */
227 
228 
229 #if USE_I2C4
230 
231 extern struct i2c_periph i2c4;
232 extern void i2c4_init(void);
233 
234 #endif /* USE_I2C4 */
235 
236 
237 #if USE_SOFTI2C0
238 extern struct i2c_periph softi2c0;
239 extern void softi2c0_init(void);
240 #endif /* USE_SOFTI2C0 */
241 
242 
243 #if USE_SOFTI2C1
244 extern struct i2c_periph softi2c1;
245 extern void softi2c1_init(void);
246 #endif /* USE_SOFTI2C1 */
247 
248 
250 extern void i2c_init(struct i2c_periph *p);
251 
256 static inline bool i2c_idle(struct i2c_periph *p) {
257  return p->idle(p);
258 }
259 
266 static inline bool i2c_submit(struct i2c_periph *p, struct i2c_transaction *t) {
267  return p->submit(p, t);
268 }
269 
274 static inline void i2c_setbitrate(struct i2c_periph *p, int bitrate) {
275  p->setbitrate(p, bitrate);
276 }
277 
278 extern void i2c_event(void);
279 
280 /*
281  * Convenience functions.
282  * Usually these are preferred over i2c_submit,
283  * as they explicitly set the transaction type again.
284  *
285  * Return FALSE if submitting the transaction failed.
286  */
296 extern bool i2c_transmit(struct i2c_periph *p, struct i2c_transaction *t,
297  uint8_t s_addr, uint8_t len);
298 
308 extern bool i2c_receive(struct i2c_periph *p, struct i2c_transaction *t,
309  uint8_t s_addr, uint16_t len);
310 
321 extern bool i2c_transceive(struct i2c_periph *p, struct i2c_transaction *t,
322  uint8_t s_addr, uint8_t len_w, uint16_t len_r);
323 
333 bool i2c_blocking_transmit(struct i2c_periph *p, struct i2c_transaction *t,
334  uint8_t s_addr, uint8_t len);
335 
345 bool i2c_blocking_receive(struct i2c_periph *p, struct i2c_transaction *t,
346  uint8_t s_addr, uint16_t len);
347 
358 bool i2c_blocking_transceive(struct i2c_periph *p, struct i2c_transaction *t,
359  uint8_t s_addr, uint8_t len_w, uint16_t len_r);
363 #endif /* I2C_H */
unsigned short uint16_t
Definition: types.h:16
volatile uint16_t arb_lost_cnt
Definition: i2c.h:170
volatile uint8_t idx_buf
Definition: i2c.h:156
I2CTransactionStatus
I2C transaction status.
Definition: i2c.h:54
#define I2C_TRANSACTION_QUEUE_LEN
I2C transaction queue length.
Definition: i2c.h:133
I2C errors counter.
Definition: i2c.h:165
I2CTransactionType
I2C transaction type.
Definition: i2c.h:46
volatile uint16_t miss_start_stop_cnt
Definition: i2c.h:169
volatile uint8_t buf[I2C_BUF_LEN]
Transaction buffer With I2C_BUF_LEN number of bytes.
Definition: i2c.h:122
uint16_t len_r
Number of bytes to read/receive.
Definition: i2c.h:110
transaction successfully finished by I2C driver
Definition: i2c.h:57
i2c_spin_fn_t * spin
Definition: i2c.h:149
static bool i2c_idle(struct i2c_periph *p)
Check if I2C bus is idle.
Definition: i2c.h:256
transmit and receive transaction
Definition: i2c.h:49
uint8_t trans_extract_idx
Definition: i2c.h:153
void i2c_init(struct i2c_periph *p)
Initialize I2C peripheral.
Definition: i2c.c:310
Definition: i2c.h:66
volatile uint16_t queue_full_cnt
Definition: i2c.h:167
struct i2c_errors * errors
Definition: i2c.h:159
enum I2CStatus status
Definition: i2c.h:155
volatile uint32_t er_irq_cnt
Definition: i2c.h:177
void * reg_addr
Definition: i2c.h:157
bool i2c_blocking_receive(struct i2c_periph *p, struct i2c_transaction *t, uint8_t s_addr, uint16_t len)
Submit a read only transaction and wait for it to complete.
Definition: i2c.c:381
void i2c_setbitrate_fn_t(struct i2c_periph *p, int bitrate)
Definition: i2c.h:141
bool i2c_blocking_transceive(struct i2c_periph *p, struct i2c_transaction *t, uint8_t s_addr, uint8_t len_w, uint16_t len_r)
Submit a write/read transaction and wait for it to complete.
Definition: i2c.c:403
uint8_t len_w
Number of bytes to write/transmit.
Definition: i2c.h:116
bool i2c_idle_fn_t(struct i2c_periph *p)
Definition: i2c.h:139
transaction set to done by user level
Definition: i2c.h:59
i2c_setbitrate_fn_t * setbitrate
Definition: i2c.h:148
unsigned long uint32_t
Definition: types.h:18
signed short int16_t
Definition: types.h:17
struct i2c_transaction * trans[I2C_TRANSACTION_QUEUE_LEN]
Definition: i2c.h:151
bool i2c_submit_fn_t(struct i2c_periph *p, struct i2c_transaction *t)
Definition: i2c.h:140
volatile uint16_t over_under_cnt
Definition: i2c.h:171
transaction failed
Definition: i2c.h:58
void i2c_spin_fn_t(struct i2c_periph *p)
Definition: i2c.h:142
Definition: i2c.h:77
bool i2c_transceive(struct i2c_periph *p, struct i2c_transaction *t, uint8_t s_addr, uint8_t len_w, uint16_t len_r)
Submit a write/read transaction.
Definition: i2c.c:344
I2C transaction structure.
Definition: i2c.h:93
enum I2CTransactionStatus status
Transaction status.
Definition: i2c.h:126
void * init_struct
Definition: i2c.h:158
i2c_submit_fn_t * submit
Definition: i2c.h:147
bool i2c_transmit(struct i2c_periph *p, struct i2c_transaction *t, uint8_t s_addr, uint8_t len)
Submit a write only transaction.
Definition: i2c.c:324
volatile uint16_t unexpected_event_cnt
Definition: i2c.h:175
uint8_t slave_addr
Slave address.
Definition: i2c.h:104
unsigned char uint8_t
Definition: types.h:14
static bool i2c_submit(struct i2c_periph *p, struct i2c_transaction *t)
Submit a I2C transaction.
Definition: i2c.h:266
#define I2C_BUF_LEN
I2C buffer length.
Definition: i2c.h:84
i2c_idle_fn_t * idle
Definition: i2c.h:146
bool i2c_receive(struct i2c_periph *p, struct i2c_transaction *t, uint8_t s_addr, uint16_t len)
Submit a read only transaction.
Definition: i2c.c:334
transaction is currently ongoing
Definition: i2c.h:56
transmit only transaction
Definition: i2c.h:47
volatile int16_t watchdog
Definition: i2c.h:160
volatile uint32_t last_unexpected_event
Definition: i2c.h:176
static void i2c_setbitrate(struct i2c_periph *p, int bitrate)
Set I2C bitrate.
Definition: i2c.h:274
static float p[2][2]
volatile uint16_t wd_reset_cnt
Definition: i2c.h:166
volatile uint16_t smbus_alert_cnt
Definition: i2c.h:174
void i2c_event(void)
i2c_event() function
Definition: i2c_arch.c:428
enum I2CTransactionType type
Transaction type.
Definition: i2c.h:98
uint8_t trans_insert_idx
Definition: i2c.h:152
volatile uint16_t pec_recep_cnt
Definition: i2c.h:172
receive only transaction
Definition: i2c.h:48
transaction is pending in queue
Definition: i2c.h:55
I2CStatus
I2C peripheral status.
Definition: i2c.h:65
bool i2c_blocking_transmit(struct i2c_periph *p, struct i2c_transaction *t, uint8_t s_addr, uint8_t len)
Submit a write only transaction and wait for it to complete.
Definition: i2c.c:359
volatile uint16_t ack_fail_cnt
Definition: i2c.h:168
volatile uint16_t timeout_tlow_cnt
Definition: i2c.h:173