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| author | Timofey Titovets <nefelim4ag@gmail.com> | 2025-07-08 21:23:27 +0200 |
|---|---|---|
| committer | KevinOConnor <kevin@koconnor.net> | 2025-07-09 15:45:52 -0400 |
| commit | 119d00705836eda8c150437af66c39f58732b492 (patch) | |
| tree | bccc737a9bcf83ccd4b5fb33bbd106766ec3aff1 | |
| parent | 1931b11001cc7b53c00e82ac992c70d7bd50a310 (diff) | |
| download | kutter-119d00705836eda8c150437af66c39f58732b492.tar.gz kutter-119d00705836eda8c150437af66c39f58732b492.tar.xz kutter-119d00705836eda8c150437af66c39f58732b492.zip | |
stm32: f0 do not send empty write on read
Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
| -rw-r--r-- | src/stm32/stm32f0_i2c.c | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/src/stm32/stm32f0_i2c.c b/src/stm32/stm32f0_i2c.c index da632c35..381fe8b4 100644 --- a/src/stm32/stm32f0_i2c.c +++ b/src/stm32/stm32f0_i2c.c @@ -224,16 +224,18 @@ i2c_read(struct i2c_config config, uint8_t reg_len, uint8_t *reg uint8_t *write_orig = reg; uint8_t *read_orig = read; - // Send start, address, reg - i2c->CR2 = (I2C_CR2_START | config.addr | - (reg_len << I2C_CR2_NBYTES_Pos)); - while (reg_len--) { - ret = i2c_wait(i2c, I2C_ISR_TXIS, timeout); - if (ret != I2C_BUS_SUCCESS) - goto abrt; - i2c->TXDR = *reg++; + if (reg_len) { + // Send start, address, reg + i2c->CR2 = (I2C_CR2_START | config.addr | + (reg_len << I2C_CR2_NBYTES_Pos)); + while (reg_len--) { + ret = i2c_wait(i2c, I2C_ISR_TXIS, timeout); + if (ret != I2C_BUS_SUCCESS) + goto abrt; + i2c->TXDR = *reg++; + } + i2c_wait(i2c, I2C_ISR_TC, timeout); } - i2c_wait(i2c, I2C_ISR_TC, timeout); // send restart, read data i2c->CR2 = (I2C_CR2_START | I2C_CR2_RD_WRN | config.addr | |