diff options
Diffstat (limited to 'ports/stm32/i2c.c')
| -rw-r--r-- | ports/stm32/i2c.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/ports/stm32/i2c.c b/ports/stm32/i2c.c index 06e26d912..5981df11c 100644 --- a/ports/stm32/i2c.c +++ b/ports/stm32/i2c.c @@ -340,8 +340,7 @@ STATIC int i2c_wait_isr_set(i2c_t *i2c, uint32_t mask) { int i2c_start_addr(i2c_t *i2c, int rd_wrn, uint16_t addr, size_t len, bool stop) { // Enable the peripheral and send the START condition with slave address i2c->CR1 |= I2C_CR1_PE; - i2c->CR2 = stop << I2C_CR2_AUTOEND_Pos - | (len > 1) << I2C_CR2_RELOAD_Pos + i2c->CR2 = (len > 1) << I2C_CR2_RELOAD_Pos | (len > 0) << I2C_CR2_NBYTES_Pos | rd_wrn << I2C_CR2_RD_WRN_Pos | (addr & 0x7f) << 1; @@ -361,6 +360,11 @@ int i2c_start_addr(i2c_t *i2c, int rd_wrn, uint16_t addr, size_t len, bool stop) return -MP_ENODEV; } + // Configure automatic STOP if needed + if (stop) { + i2c->CR2 |= I2C_CR2_AUTOEND; + } + // Repurpose OAR1 to indicate that we loaded CR2 i2c->OAR1 = 1; |