diff options
| -rw-r--r-- | ports/stm32/i2cslave.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/ports/stm32/i2cslave.c b/ports/stm32/i2cslave.c index f3bb232f7..0e4fbf489 100644 --- a/ports/stm32/i2cslave.c +++ b/ports/stm32/i2cslave.c @@ -94,6 +94,9 @@ void i2c_slave_irq_handler(i2c_slave_t *i2c) { i2c->ISR = I2C_ISR_TXE; i2c->ICR = I2C_ICR_ADDRCF; i2c_slave_process_addr_match(i2c, (i2c->ISR >> I2C_ISR_DIR_Pos) & 1); + // Re-read ISR in case i2c_slave_process_addr_match() took some time + // to process and TXIS/RXNE was set in the meantime. + isr = i2c->ISR; } if (isr & I2C_ISR_TXIS) { // This callback must call i2c_slave_write_byte. |