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STM32F0 SPI
- [..]
- Using the HAL it is not possible to reach all supported SPI frequency with the differents SPI Modes,
- the following table resume the max SPI frequency reached with data size 8bits/16bits:
- +-----------------------------------------------------------------------------------------+
- | | | 2Lines Fullduplex | 2Lines RxOnly | 1Line |
- | Process | Tranfert mode |--------------------|--------------------|--------------------|
- | | | Master | Slave | Master | Slave | Master | Slave |
- |=========================================================================================|
- | T | Polling | Fcpu/32 | Fcpu/32 | NA | NA | NA | NA |
- | X |----------------|----------|---------|----------|---------|----------|---------|
- | / | Interrupt | Fcpu/32 | Fcpu/32 | NA | NA | NA | NA |
- | R |----------------|----------|---------|----------|---------|----------|---------|
- | X | DMA | Fcpu/32 | Fcpu/16 | NA | NA | NA | NA |
- |=========|================|==========|=========|==========|=========|==========|=========|
- | | Polling | Fcpu/32 | Fcpu/16 | Fcpu/16 | Fcpu/16 | Fcpu/16 | Fcpu/16 |
- | |----------------|----------|---------|----------|---------|----------|---------|
- | R | Interrupt | Fcpu/16 | Fcpu/16 | Fcpu/16 | Fcpu/16 | Fcpu/16 | Fcpu/16 |
- | X |----------------|----------|---------|----------|---------|----------|---------|
- | | DMA | Fcpu/4 | Fcpu/8 | Fcpu/4 | Fcpu/4 | Fcpu/8 | Fcpu/16 |
- |=========|================|==========|=========|==========|=========|==========|=========|
- | | Polling | Fcpu/16 | Fcpu/16 | NA | NA | Fcpu/16 | Fcpu/16 |
- | |----------------|----------|---------|----------|---------|----------|---------|
- | T | Interrupt | Fcpu/32 | Fcpu/16 | NA | NA | Fcpu/16 | Fcpu/16 |
- | X |----------------|----------|---------|----------|---------|----------|---------|
- | | DMA | Fcpu/2 | Fcpu/16 | NA | NA | Fcpu/8 | Fcpu/16 |
- +-----------------------------------------------------------------------------------------+
为什么速率限制到这么低？[/td]
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