diff options
Diffstat (limited to 'extmod/machine_i2c.c')
| -rw-r--r-- | extmod/machine_i2c.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/extmod/machine_i2c.c b/extmod/machine_i2c.c index f2c959b95..7d0628a2d 100644 --- a/extmod/machine_i2c.c +++ b/extmod/machine_i2c.c @@ -514,6 +514,21 @@ STATIC int read_mem(mp_obj_t self_in, uint16_t addr, uint32_t memaddr, uint8_t a uint8_t memaddr_buf[4]; size_t memaddr_len = fill_memaddr_buf(&memaddr_buf[0], memaddr, addrsize); + #if MICROPY_PY_MACHINE_I2C_TRANSFER_WRITE1 + + // Create partial write and read buffers + mp_machine_i2c_buf_t bufs[2] = { + {.len = memaddr_len, .buf = memaddr_buf}, + {.len = len, .buf = buf}, + }; + + // Do write+read I2C transfer + mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t *)self->type->protocol; + return i2c_p->transfer(self, addr, 2, bufs, + MP_MACHINE_I2C_FLAG_WRITE1 | MP_MACHINE_I2C_FLAG_READ | MP_MACHINE_I2C_FLAG_STOP); + + #else + int ret = mp_machine_i2c_writeto(self, addr, memaddr_buf, memaddr_len, false); if (ret != memaddr_len) { // must generate STOP @@ -521,6 +536,8 @@ STATIC int read_mem(mp_obj_t self_in, uint16_t addr, uint32_t memaddr, uint8_t a return ret; } return mp_machine_i2c_readfrom(self, addr, buf, len, true); + + #endif } STATIC int write_mem(mp_obj_t self_in, uint16_t addr, uint32_t memaddr, uint8_t addrsize, const uint8_t *buf, size_t len) { |