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Add mgos_i2c_bitfields.c

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Pim van Pelt
2019-01-09 14:13:08 +01:00
parent 60bf5b82a5
commit b631bc7326
2 changed files with 114 additions and 0 deletions
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27
include/mgos_i2c.h
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@ -115,6 +115,33 @@ bool mgos_i2c_write_reg_w(struct mgos_i2c *conn, uint16_t addr, uint8_t reg,
bool mgos_i2c_write_reg_n(struct mgos_i2c *conn, uint16_t addr, uint8_t reg,
size_t n, const uint8_t *buf);
/*
* Helper to set/get a number of bits in a register `reg` on a device at
* address `addr`.
* - bitoffset: 0..7 is the position at which to write `value`
* - bitlen : number of bits to write
* - value : the value to write there
*
* Invariants:
* - value must fit in `bitlen` (ie value < 2^bitlen)
* - bitlen+bitoffset <= register size (8 for reg_b, 16 for reg_w)
* - bitlen cannot be 0.
*
* The `setbits` call will write the bits to the register, the `getbits` call
* will return the value of those bits in *value.
*
* Returns `true` in case of success, `false` otherwise.
*/
bool mgos_i2c_setbits_reg_b(struct mgos_i2c *conn, uint16_t addr, uint8_t reg,
uint8_t bitoffset, uint8_t bitlen, uint8_t value);
bool mgos_i2c_getbits_reg_b(struct mgos_i2c *conn, uint16_t addr, uint8_t reg,
uint8_t bitoffset, uint8_t bitlen, uint8_t *value);
bool mgos_i2c_setbits_reg_w(struct mgos_i2c *conn, uint16_t addr, uint8_t reg,
uint8_t bitoffset, uint8_t bitlen, uint16_t value);
bool mgos_i2c_getbits_reg_w(struct mgos_i2c *conn, uint16_t addr, uint8_t reg,
uint8_t bitoffset, uint8_t bitlen, uint16_t *value);
/* Close i2c connection and free resources. */
void mgos_i2c_close(struct mgos_i2c *conn);