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stm32: f0 do not send empty write on read
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Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
This commit is contained in:
Timofey Titovets 2025-07-08 21:23:27 +02:00 • committed by KevinOConnor
parent 1931b11001
commit 119d007058
1 changed files with 11 additions and 9 deletions
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20
src/stm32/stm32f0_i2c.c
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@ -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 |