diff options
Diffstat (limited to 'src/drivers/device/spi.cpp')
| -rw-r--r-- | src/drivers/device/spi.cpp | 62 |
1 files changed, 30 insertions, 32 deletions
diff --git a/src/drivers/device/spi.cpp b/src/drivers/device/spi.cpp index 0b232e158..1ab1dc699 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 |