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STM32: Fix I2C stop condition 

Need to ensure the transmission has been started before sending a STOP condition.

Issue found on the NUCLEO_H743ZI due certainly to the high-speed clock used.

But this is normally needed also on all STM32 devices using the I2C peripheral version 2.
pull/8280/head
bcostm 2018-09-27 17:43:32 +02:00
parent f1587b50d7
commit 9cade872db
1 changed files with 11 additions and 0 deletions
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11
targets/TARGET_STM/i2c_api.c
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@ -590,6 +590,17 @@ int i2c_stop(i2c_t *obj)
#endif
// Disable reload mode
handle->Instance->CR2 &= (uint32_t)~I2C_CR2_RELOAD;
// Ensure the transmission is started before sending a stop
if ((handle->Instance->CR2 & (uint32_t)I2C_CR2_RD_WRN) == 0) {
timeout = FLAG_TIMEOUT;
while (!__HAL_I2C_GET_FLAG(handle, I2C_FLAG_TXIS)) {
if ((timeout--) == 0) {
return I2C_ERROR_BUS_BUSY;
}
}
}
// Generate the STOP condition
handle->Instance->CR2 |= I2C_CR2_STOP;