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STM32 SPI specific mode for higher performance
This commit implements a SPI mode which will offer better performance thanks to usage of Lower Layer API which use fewer registers access, at the cost of lower robustness (no error management).
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‎targets/TARGET_STM/TARGET_STM32F0/spi_device.h

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/* mbed Microcontroller Library
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*******************************************************************************
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* Copyright (c) 2017, STMicroelectronics
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
13+
* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*******************************************************************************
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*/
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#ifndef MBED_SPI_DEVICE_H
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#define MBED_SPI_DEVICE_H
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#include "stm32f0xx_ll_spi.h"
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#endif

‎targets/TARGET_STM/TARGET_STM32F1/spi_device.h

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/* mbed Microcontroller Library
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*******************************************************************************
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* Copyright (c) 2017, STMicroelectronics
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* All rights reserved.
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*
6+
* Redistribution and use in source and binary forms, with or without
7+
* modification, are permitted provided that the following conditions are met:
8+
*
9+
* 1. Redistributions of source code must retain the above copyright notice,
10+
* this list of conditions and the following disclaimer.
11+
* 2. Redistributions in binary form must reproduce the above copyright notice,
12+
* this list of conditions and the following disclaimer in the documentation
13+
* and/or other materials provided with the distribution.
14+
* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21+
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*******************************************************************************
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*/
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#ifndef MBED_SPI_DEVICE_H
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#define MBED_SPI_DEVICE_H
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#include "stm32f1xx_ll_spi.h"
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#endif

‎targets/TARGET_STM/TARGET_STM32F2/spi_device.h

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/* mbed Microcontroller Library
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*******************************************************************************
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* Copyright (c) 2017, STMicroelectronics
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
13+
* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*******************************************************************************
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*/
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#ifndef MBED_SPI_DEVICE_H
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#define MBED_SPI_DEVICE_H
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#include "stm32f2xx_ll_spi.h"
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#endif

‎targets/TARGET_STM/TARGET_STM32F3/spi_device.h

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/* mbed Microcontroller Library
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*******************************************************************************
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* Copyright (c) 2017, STMicroelectronics
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
7+
* modification, are permitted provided that the following conditions are met:
8+
*
9+
* 1. Redistributions of source code must retain the above copyright notice,
10+
* this list of conditions and the following disclaimer.
11+
* 2. Redistributions in binary form must reproduce the above copyright notice,
12+
* this list of conditions and the following disclaimer in the documentation
13+
* and/or other materials provided with the distribution.
14+
* 3. Neither the name of STMicroelectronics nor the names of its contributors
15+
* may be used to endorse or promote products derived from this software
16+
* without specific prior written permission.
17+
*
18+
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19+
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20+
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21+
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
22+
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23+
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27+
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*******************************************************************************
29+
*/
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#ifndef MBED_SPI_DEVICE_H
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#define MBED_SPI_DEVICE_H
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#include "stm32f3xx_ll_spi.h"
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#endif

‎targets/TARGET_STM/TARGET_STM32F4/spi_device.h

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/* mbed Microcontroller Library
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*******************************************************************************
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* Copyright (c) 2017, STMicroelectronics
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
7+
* modification, are permitted provided that the following conditions are met:
8+
*
9+
* 1. Redistributions of source code must retain the above copyright notice,
10+
* this list of conditions and the following disclaimer.
11+
* 2. Redistributions in binary form must reproduce the above copyright notice,
12+
* this list of conditions and the following disclaimer in the documentation
13+
* and/or other materials provided with the distribution.
14+
* 3. Neither the name of STMicroelectronics nor the names of its contributors
15+
* may be used to endorse or promote products derived from this software
16+
* without specific prior written permission.
17+
*
18+
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19+
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20+
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21+
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
22+
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23+
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24+
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
26+
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*******************************************************************************
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*/
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#ifndef MBED_SPI_DEVICE_H
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#define MBED_SPI_DEVICE_H
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#include "stm32f4xx_ll_spi.h"
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#endif

‎targets/TARGET_STM/TARGET_STM32F7/spi_device.h

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/* mbed Microcontroller Library
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*******************************************************************************
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* Copyright (c) 2017, STMicroelectronics
4+
* All rights reserved.
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*
6+
* Redistribution and use in source and binary forms, with or without
7+
* modification, are permitted provided that the following conditions are met:
8+
*
9+
* 1. Redistributions of source code must retain the above copyright notice,
10+
* this list of conditions and the following disclaimer.
11+
* 2. Redistributions in binary form must reproduce the above copyright notice,
12+
* this list of conditions and the following disclaimer in the documentation
13+
* and/or other materials provided with the distribution.
14+
* 3. Neither the name of STMicroelectronics nor the names of its contributors
15+
* may be used to endorse or promote products derived from this software
16+
* without specific prior written permission.
17+
*
18+
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19+
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20+
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21+
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
22+
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23+
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24+
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
26+
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27+
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28+
*******************************************************************************
29+
*/
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#ifndef MBED_SPI_DEVICE_H
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#define MBED_SPI_DEVICE_H
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#include "stm32f7xx_ll_spi.h"
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#endif

‎targets/TARGET_STM/TARGET_STM32L0/spi_device.h

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/* mbed Microcontroller Library
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*******************************************************************************
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* Copyright (c) 2017, STMicroelectronics
4+
* All rights reserved.
5+
*
6+
* Redistribution and use in source and binary forms, with or without
7+
* modification, are permitted provided that the following conditions are met:
8+
*
9+
* 1. Redistributions of source code must retain the above copyright notice,
10+
* this list of conditions and the following disclaimer.
11+
* 2. Redistributions in binary form must reproduce the above copyright notice,
12+
* this list of conditions and the following disclaimer in the documentation
13+
* and/or other materials provided with the distribution.
14+
* 3. Neither the name of STMicroelectronics nor the names of its contributors
15+
* may be used to endorse or promote products derived from this software
16+
* without specific prior written permission.
17+
*
18+
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19+
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20+
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21+
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
22+
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23+
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24+
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
25+
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
26+
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27+
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28+
*******************************************************************************
29+
*/
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#ifndef MBED_SPI_DEVICE_H
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#define MBED_SPI_DEVICE_H
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#include "stm32l0xx_ll_spi.h"
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#endif

‎targets/TARGET_STM/TARGET_STM32L1/spi_device.h

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@@ -0,0 +1,35 @@
1+
/* mbed Microcontroller Library
2+
*******************************************************************************
3+
* Copyright (c) 2017, STMicroelectronics
4+
* All rights reserved.
5+
*
6+
* Redistribution and use in source and binary forms, with or without
7+
* modification, are permitted provided that the following conditions are met:
8+
*
9+
* 1. Redistributions of source code must retain the above copyright notice,
10+
* this list of conditions and the following disclaimer.
11+
* 2. Redistributions in binary form must reproduce the above copyright notice,
12+
* this list of conditions and the following disclaimer in the documentation
13+
* and/or other materials provided with the distribution.
14+
* 3. Neither the name of STMicroelectronics nor the names of its contributors
15+
* may be used to endorse or promote products derived from this software
16+
* without specific prior written permission.
17+
*
18+
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19+
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20+
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21+
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
22+
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23+
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24+
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
25+
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
26+
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27+
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28+
*******************************************************************************
29+
*/
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#ifndef MBED_SPI_DEVICE_H
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#define MBED_SPI_DEVICE_H
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#include "stm32l1xx_ll_spi.h"
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#endif

‎targets/TARGET_STM/TARGET_STM32L4/spi_device.h

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1+
/* mbed Microcontroller Library
2+
*******************************************************************************
3+
* Copyright (c) 2017, STMicroelectronics
4+
* All rights reserved.
5+
*
6+
* Redistribution and use in source and binary forms, with or without
7+
* modification, are permitted provided that the following conditions are met:
8+
*
9+
* 1. Redistributions of source code must retain the above copyright notice,
10+
* this list of conditions and the following disclaimer.
11+
* 2. Redistributions in binary form must reproduce the above copyright notice,
12+
* this list of conditions and the following disclaimer in the documentation
13+
* and/or other materials provided with the distribution.
14+
* 3. Neither the name of STMicroelectronics nor the names of its contributors
15+
* may be used to endorse or promote products derived from this software
16+
* without specific prior written permission.
17+
*
18+
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19+
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20+
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21+
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
22+
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23+
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24+
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
25+
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
26+
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27+
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28+
*******************************************************************************
29+
*/
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#ifndef MBED_SPI_DEVICE_H
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#define MBED_SPI_DEVICE_H
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#include "stm32l4xx_ll_spi.h"
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#endif

‎targets/TARGET_STM/stm_spi_api.c

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@@ -38,6 +38,7 @@
3838
#include "cmsis.h"
3939
#include "pinmap.h"
4040
#include "PeripheralPins.h"
41+
#include "spi_device.h"
4142

4243
#if DEVICE_SPI_ASYNCH
4344
#define SPI_INST(obj) ((SPI_TypeDef *)(obj->spi.spi))
@@ -349,21 +350,40 @@ static inline int ssp_busy(spi_t *obj)
349350

350351
int spi_master_write(spi_t *obj, int value)
351352
{
352-
uint16_t size, ret;
353-
int Rx = 0;
354353
struct spi_s *spiobj = SPI_S(obj);
355354
SPI_HandleTypeDef *handle = &(spiobj->handle);
356355

357-
size = (handle->Init.DataSize == SPI_DATASIZE_16BIT) ? 2 : 1;
356+
#if defined(LL_SPI_RX_FIFO_TH_HALF)
357+
/* Configure the default data size */
358+
if (handle->Init.DataSize == SPI_DATASIZE_16BIT) {
359+
LL_SPI_SetRxFIFOThreshold(SPI_INST(obj), LL_SPI_RX_FIFO_TH_HALF);
360+
} else {
361+
LL_SPI_SetRxFIFOThreshold(SPI_INST(obj), LL_SPI_RX_FIFO_TH_QUARTER);
362+
}
363+
#endif
364+
365+
/* Here we're using LL which means direct registers access
366+
* There is no error management, so we may end up looping
367+
* infinitely here in case of faulty device for insatnce,
368+
* but this will increase performances significantly
369+
*/
370+
371+
/* Wait TXE flag to transmit data */
372+
while (!LL_SPI_IsActiveFlag_TXE(SPI_INST(obj)));
373+
374+
if (handle->Init.DataSize == SPI_DATASIZE_16BIT) {
375+
LL_SPI_TransmitData16(SPI_INST(obj), value);
376+
} else {
377+
LL_SPI_TransmitData8(SPI_INST(obj), (uint8_t) value);
378+
}
358379

359-
/* Use 10ms timeout */
360-
ret = HAL_SPI_TransmitReceive(handle,(uint8_t*)&value,(uint8_t*)&Rx,size,HAL_MAX_DELAY);
380+
/* Then wait RXE flag before reading */
381+
while (!LL_SPI_IsActiveFlag_RXNE(SPI_INST(obj)));
361382

362-
if(ret == HAL_OK) {
363-
return Rx;
383+
if (handle->Init.DataSize == SPI_DATASIZE_16BIT) {
384+
return LL_SPI_ReceiveData16(SPI_INST(obj));
364385
} else {
365-
DEBUG_PRINTF("SPI inst=0x%8X ERROR in write\r\n", (int)handle->Instance);
366-
return -1;
386+
return LL_SPI_ReceiveData8(SPI_INST(obj));
367387
}
368388
}
369389

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