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stm32: f0 make i2c distinguish I2C NACKs

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Some devices can return a read NACK on host retries.
When the MCU receives the I2C CMD, reads out data,
but fails to deliver a response to the host.
The host retries, the device returns NACK,
and the MCU goes into the shutdown state.

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
This commit is contained in:
Timofey Titovets 2025-07-03 20:50:51 +02:00 committed by KevinOConnor
parent c01e6eee1d
commit 1931b11001
1 changed files with 11 additions and 1 deletions
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12
src/stm32/stm32f0_i2c.c
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@ -195,6 +195,7 @@ i2c_write(struct i2c_config config, uint8_t write_len, uint8_t *write)
I2C_TypeDef *i2c = config.i2c;
uint32_t timeout = timer_read_time() + timer_from_us(5000);
int ret = I2C_BUS_SUCCESS;
uint8_t *write_orig = write;
// Send start and address
i2c->CR2 = (I2C_CR2_START | config.addr | (write_len << I2C_CR2_NBYTES_Pos)
@ -207,6 +208,8 @@ i2c_write(struct i2c_config config, uint8_t write_len, uint8_t *write)
}
return i2c_wait(i2c, I2C_ISR_TXE, timeout);
abrt:
if (write == write_orig && ret == I2C_BUS_NACK)
ret = I2C_BUS_START_NACK;
i2c->CR2 |= I2C_CR2_STOP;
return ret;
}
@ -218,6 +221,8 @@ i2c_read(struct i2c_config config, uint8_t reg_len, uint8_t *reg
I2C_TypeDef *i2c = config.i2c;
uint32_t timeout = timer_read_time() + timer_from_us(5000);
int ret = I2C_BUS_SUCCESS;
uint8_t *write_orig = reg;
uint8_t *read_orig = read;
// Send start, address, reg
i2c->CR2 = (I2C_CR2_START | config.addr |
@ -236,11 +241,16 @@ i2c_read(struct i2c_config config, uint8_t reg_len, uint8_t *reg
while (read_len--) {
ret = i2c_wait(i2c, I2C_ISR_RXNE, timeout);
if (ret != I2C_BUS_SUCCESS)
goto abrt;
goto abrt_read;
*read++ = i2c->RXDR;
}
return i2c_wait(i2c, I2C_ISR_STOPF, timeout);
abrt_read:
if (read == read_orig && ret == I2C_BUS_NACK)
ret = I2C_BUS_START_READ_NACK;
abrt:
if (reg == write_orig && ret == I2C_BUS_NACK)
ret = I2C_BUS_START_NACK;
i2c->CR2 |= I2C_CR2_STOP;
return ret;
}