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author | px4dev <px4@purgatory.org> | 2014-07-06 11:40:28 -0700 |
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committer | px4dev <px4@purgatory.org> | 2014-07-06 11:40:28 -0700 |
commit | ef6c99c1ab4ebce2378bfeef1813b6e9d01367ed (patch) | |
tree | b39533783b489fddd68324adc153fff35534c564 /src | |
parent | bd88951f6ce609bc5ba364bfa3d19ae61e444964 (diff) | |
download | px4-firmware-ef6c99c1ab4ebce2378bfeef1813b6e9d01367ed.tar.gz px4-firmware-ef6c99c1ab4ebce2378bfeef1813b6e9d01367ed.tar.bz2 px4-firmware-ef6c99c1ab4ebce2378bfeef1813b6e9d01367ed.zip |
Restructure the locking around SPI transfers
Diffstat (limited to 'src')
-rw-r--r-- | src/drivers/device/spi.cpp | 62 | ||||
-rw-r--r-- | src/drivers/device/spi.h | 2 |
2 files changed, 32 insertions, 32 deletions
diff --git a/src/drivers/device/spi.cpp b/src/drivers/device/spi.cpp index fed6c312c..57cef34d2 100644 --- a/src/drivers/device/spi.cpp +++ b/src/drivers/device/spi.cpp @@ -133,26 +133,44 @@ SPI::probe() int SPI::transfer(uint8_t *send, uint8_t *recv, unsigned len) { - irqstate_t state; + int result; if ((send == nullptr) && (recv == nullptr)) return -EINVAL; + LockMode mode = up_interrupt_context() ? LOCK_NONE : locking_mode; + /* lock the bus as required */ - if (!up_interrupt_context()) { - switch (locking_mode) { - default: - case LOCK_PREEMPTION: - state = irqsave(); - break; - case LOCK_THREADS: - SPI_LOCK(_dev, true); - break; - case LOCK_NONE: - break; + switch (mode) { + default: + case LOCK_PREEMPTION: + { + irqstate_t state = irqsave(); + result = _transfer(send, recv, len); + irqrestore(state); } + break; + case LOCK_THREADS: + SPI_LOCK(_dev, true); + result = _transfer(send, recv, len); + SPI_LOCK(_dev, false); + break; + case LOCK_NONE: + result = _transfer(send, recv, len); + break; } + return result; +} +void +SPI::set_frequency(uint32_t frequency) +{ + _frequency = frequency; +} + +int +SPI::_transfer(uint8_t *send, uint8_t *recv, unsigned len) +{ SPI_SETFREQUENCY(_dev, _frequency); SPI_SETMODE(_dev, _mode); SPI_SETBITS(_dev, 8); @@ -164,27 +182,7 @@ SPI::transfer(uint8_t *send, uint8_t *recv, unsigned len) /* and clean up */ SPI_SELECT(_dev, _device, false); - if (!up_interrupt_context()) { - switch (locking_mode) { - default: - case LOCK_PREEMPTION: - irqrestore(state); - break; - case LOCK_THREADS: - SPI_LOCK(_dev, false); - break; - case LOCK_NONE: - break; - } - } - return OK; } -void -SPI::set_frequency(uint32_t frequency) -{ - _frequency = frequency; -} - } // namespace device diff --git a/src/drivers/device/spi.h b/src/drivers/device/spi.h index 299575dc5..8e943b3f2 100644 --- a/src/drivers/device/spi.h +++ b/src/drivers/device/spi.h @@ -129,6 +129,8 @@ private: enum spi_mode_e _mode; uint32_t _frequency; struct spi_dev_s *_dev; + + int _transfer(uint8_t *send, uint8_t *recv, unsigned len); }; } // namespace device |