I2C: Move F1-only errata workarounds out of libmaple/i2c.c.

The IRQ priority hack is unnecessary on targets with properly
functioning I2C IRQ handlers, so we shouldn't use it unless we have
to. Add a mechanism so a series header can provide such a hack if
necessary.  Have the F1 series header use this mechanism.

Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>

1 files changed, 0 insertions, 30 deletions

diff --git a/libmaple/i2c.c b/libmaple/i2c.c
index 2e11f54..291bf16 100644
--- a/libmaple/i2c.c
+++ b/libmaple/i2c.c
@@ -223,36 +223,6 @@ void i2c_master_enable(i2c_dev *dev, uint32 flags) {
     nvic_irq_enable(dev->er_nvic_line);
     i2c_enable_irq(dev, I2C_IRQ_EVENT | I2C_IRQ_BUFFER | I2C_IRQ_ERROR);
 
-    /*
-     * Important STM32 Errata:
-     *
-     * See STM32F10xx8 and STM32F10xxB Errata sheet (Doc ID 14574 Rev 8),
-     * Section 2.11.1, 2.11.2.
-     *
-     * 2.11.1:
-     * When the EV7, EV7_1, EV6_1, EV6_3, EV2, EV8, and EV3 events are not
-     * managed before the current byte is being transferred, problems may be
-     * encountered such as receiving an extra byte, reading the same data twice
-     * or missing data.
-     *
-     * 2.11.2:
-     * In Master Receiver mode, when closing the communication using
-     * method 2, the content of the last read data can be corrupted.
-     *
-     * If the user software is not able to read the data N-1 before the STOP
-     * condition is generated on the bus, the content of the shift register
-     * (data N) will be corrupted. (data N is shifted 1-bit to the left).
-     *
-     * ----------------------------------------------------------------------
-     *
-     * In order to ensure that events are not missed, the i2c interrupt must
-     * not be preempted. We set the i2c interrupt priority to be the highest
-     * interrupt in the system (priority level 0). All other interrupts have
-     * been initialized to priority level 16. See nvic_init().
-     */
-    nvic_irq_set_priority(dev->ev_nvic_line, 0);
-    nvic_irq_set_priority(dev->er_nvic_line, 0);
-
     /* Make it go! */
     i2c_peripheral_enable(dev);