diff options
Diffstat (limited to 'libmaple/include/libmaple/i2c.h')
| -rw-r--r-- | libmaple/include/libmaple/i2c.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/libmaple/include/libmaple/i2c.h b/libmaple/include/libmaple/i2c.h index 8ce6674..c66ebcb 100644 --- a/libmaple/include/libmaple/i2c.h +++ b/libmaple/include/libmaple/i2c.h @@ -50,6 +50,17 @@ extern "C" { * - uint32 _i2c_bus_clk(i2c_dev*): Clock frequency of dev's bus, in * MHz. (This is for internal use only). * + * - (optional) _I2C_HAVE_IRQ_FIXUP: Leave undefined, or define to 1. + * This is for internal use only. It's a hack to work around a + * silicon bug related to I2C IRQ pre-emption on some targets. If 1, + * the series header must also declare and implement a routine with + * this signature (it may also be provided as a macro): + * + * void _i2c_irq_priority_fixup(i2c_dev*) + * + * This will be called by i2c_enable_irq() before actually enabling + * I2C interrupts. + * * - Reg. map base pointers, device pointer declarations. */ @@ -243,6 +254,12 @@ static inline void i2c_stop_condition(i2c_dev *dev) { /* IRQ enable/disable */ +#ifndef _I2C_HAVE_IRQ_FIXUP +/* The series header provides this if _I2C_HAVE_IRQ_FIXUP is defined, + * but we need it either way. */ +#define _i2c_irq_priority_fixup(dev) ((void)0) +#endif + #define I2C_IRQ_ERROR I2C_CR2_ITERREN #define I2C_IRQ_EVENT I2C_CR2_ITEVTEN #define I2C_IRQ_BUFFER I2C_CR2_ITBUFEN @@ -255,6 +272,7 @@ static inline void i2c_stop_condition(i2c_dev *dev) { * I2C_IRQ_BUFFER (buffer interrupt). */ static inline void i2c_enable_irq(i2c_dev *dev, uint32 irqs) { + _i2c_irq_priority_fixup(dev); dev->regs->CR2 |= irqs; } |