668 lines
25 KiB
C
668 lines
25 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "py/nlr.h"
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#include "py/runtime.h"
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#include "irq.h"
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#include "pin.h"
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#include "genhdr/pins.h"
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#include "bufhelper.h"
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#include "dma.h"
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#include "spi.h"
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#include MICROPY_HAL_H
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/// \moduleref pyb
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/// \class SPI - a master-driven serial protocol
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///
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/// SPI is a serial protocol that is driven by a master. At the physical level
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/// there are 3 lines: SCK, MOSI, MISO.
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///
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/// See usage model of I2C; SPI is very similar. Main difference is
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/// parameters to init the SPI bus:
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///
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/// from pyb import SPI
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/// spi = SPI(1, SPI.MASTER, baudrate=600000, polarity=1, phase=0, crc=0x7)
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///
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/// Only required parameter is mode, SPI.MASTER or SPI.SLAVE. Polarity can be
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/// 0 or 1, and is the level the idle clock line sits at. Phase can be 0 or 1
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/// to sample data on the first or second clock edge respectively. Crc can be
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/// None for no CRC, or a polynomial specifier.
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///
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/// Additional method for SPI:
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///
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/// data = spi.send_recv(b'1234') # send 4 bytes and receive 4 bytes
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/// buf = bytearray(4)
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/// spi.send_recv(b'1234', buf) # send 4 bytes and receive 4 into buf
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/// spi.send_recv(buf, buf) # send/recv 4 bytes from/to buf
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// Possible DMA configurations for SPI busses:
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// SPI1_TX: DMA2_Stream3.CHANNEL_3 or DMA2_Stream5.CHANNEL_3
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// SPI1_RX: DMA2_Stream0.CHANNEL_3 or DMA2_Stream2.CHANNEL_3
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// SPI2_TX: DMA1_Stream4.CHANNEL_0
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// SPI2_RX: DMA1_Stream3.CHANNEL_0
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// SPI3_TX: DMA1_Stream5.CHANNEL_0 or DMA1_Stream7.CHANNEL_0
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// SPI3_RX: DMA1_Stream0.CHANNEL_0 or DMA1_Stream2.CHANNEL_0
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typedef struct _pyb_spi_obj_t {
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mp_obj_base_t base;
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SPI_HandleTypeDef *spi;
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DMA_Stream_TypeDef *tx_dma_stream;
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uint32_t tx_dma_channel;
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DMA_Stream_TypeDef *rx_dma_stream;
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uint32_t rx_dma_channel;
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} pyb_spi_obj_t;
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#if MICROPY_HW_ENABLE_SPI1
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SPI_HandleTypeDef SPIHandle1 = {.Instance = NULL};
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#endif
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#if MICROPY_HW_ENABLE_SPI2
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SPI_HandleTypeDef SPIHandle2 = {.Instance = NULL};
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#endif
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#if MICROPY_HW_ENABLE_SPI3
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SPI_HandleTypeDef SPIHandle3 = {.Instance = NULL};
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#endif
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STATIC const pyb_spi_obj_t pyb_spi_obj[] = {
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#if MICROPY_HW_ENABLE_SPI1
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{{&pyb_spi_type}, &SPIHandle1, DMA2_Stream5, DMA_CHANNEL_3, DMA2_Stream2, DMA_CHANNEL_3},
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#else
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{{&pyb_spi_type}, NULL, NULL, 0, NULL, 0},
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#endif
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#if MICROPY_HW_ENABLE_SPI2
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{{&pyb_spi_type}, &SPIHandle2, DMA1_Stream4, DMA_CHANNEL_0, DMA1_Stream3, DMA_CHANNEL_0},
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#else
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{{&pyb_spi_type}, NULL, NULL, 0, NULL, 0},
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#endif
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#if MICROPY_HW_ENABLE_SPI3
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{{&pyb_spi_type}, &SPIHandle3, DMA1_Stream7, DMA_CHANNEL_0, DMA1_Stream2, DMA_CHANNEL_0},
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#else
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{{&pyb_spi_type}, NULL, NULL, 0, NULL, 0},
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#endif
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};
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void spi_init0(void) {
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// reset the SPI handles
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#if MICROPY_HW_ENABLE_SPI1
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memset(&SPIHandle1, 0, sizeof(SPI_HandleTypeDef));
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SPIHandle1.Instance = SPI1;
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#endif
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#if MICROPY_HW_ENABLE_SPI2
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memset(&SPIHandle2, 0, sizeof(SPI_HandleTypeDef));
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SPIHandle2.Instance = SPI2;
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#endif
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#if MICROPY_HW_ENABLE_SPI3
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memset(&SPIHandle3, 0, sizeof(SPI_HandleTypeDef));
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SPIHandle3.Instance = SPI3;
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#endif
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}
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// TODO allow to take a list of pins to use
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void spi_init(SPI_HandleTypeDef *spi, bool enable_nss_pin) {
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// init the GPIO lines
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.Mode = GPIO_MODE_AF_PP;
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GPIO_InitStructure.Speed = GPIO_SPEED_FAST;
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GPIO_InitStructure.Pull = spi->Init.CLKPolarity == SPI_POLARITY_LOW ? GPIO_PULLDOWN : GPIO_PULLUP;
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const pyb_spi_obj_t *self;
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const pin_obj_t *pins[4];
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if (0) {
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#if MICROPY_HW_ENABLE_SPI1
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} else if (spi->Instance == SPI1) {
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// X-skin: X5=PA4=SPI1_NSS, X6=PA5=SPI1_SCK, X7=PA6=SPI1_MISO, X8=PA7=SPI1_MOSI
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self = &pyb_spi_obj[0];
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pins[0] = &pin_A4;
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pins[1] = &pin_A5;
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pins[2] = &pin_A6;
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pins[3] = &pin_A7;
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GPIO_InitStructure.Alternate = GPIO_AF5_SPI1;
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// enable the SPI clock
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__SPI1_CLK_ENABLE();
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#endif
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#if MICROPY_HW_ENABLE_SPI2
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} else if (spi->Instance == SPI2) {
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// Y-skin: Y5=PB12=SPI2_NSS, Y6=PB13=SPI2_SCK, Y7=PB14=SPI2_MISO, Y8=PB15=SPI2_MOSI
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self = &pyb_spi_obj[1];
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pins[0] = &pin_B12;
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pins[1] = &pin_B13;
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pins[2] = &pin_B14;
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pins[3] = &pin_B15;
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GPIO_InitStructure.Alternate = GPIO_AF5_SPI2;
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// enable the SPI clock
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__SPI2_CLK_ENABLE();
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#endif
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#if MICROPY_HW_ENABLE_SPI3
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} else if (spi->Instance == SPI3) {
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self = &pyb_spi_obj[2];
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pins[0] = &pin_A4;
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pins[1] = &pin_B3;
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pins[2] = &pin_B4;
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pins[3] = &pin_B5;
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GPIO_InitStructure.Alternate = GPIO_AF6_SPI3;
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// enable the SPI clock
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__SPI3_CLK_ENABLE();
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#endif
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} else {
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// SPI does not exist for this board (shouldn't get here, should be checked by caller)
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return;
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}
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for (uint i = (enable_nss_pin ? 0 : 1); i < 4; i++) {
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GPIO_InitStructure.Pin = pins[i]->pin_mask;
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HAL_GPIO_Init(pins[i]->gpio, &GPIO_InitStructure);
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}
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// init the SPI device
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if (HAL_SPI_Init(spi) != HAL_OK) {
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// init error
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// TODO should raise an exception, but this function is not necessarily going to be
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// called via Python, so may not be properly wrapped in an NLR handler
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printf("OSError: HAL_SPI_Init failed\n");
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return;
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}
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// After calling HAL_SPI_Init() it seems that the DMA gets disconnected if
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// it was previously configured. So we invalidate the DMA channel to force
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// an initialisation the next time we use it.
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dma_invalidate_channel(self->tx_dma_stream, self->tx_dma_channel);
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dma_invalidate_channel(self->rx_dma_stream, self->rx_dma_channel);
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}
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void spi_deinit(SPI_HandleTypeDef *spi) {
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HAL_SPI_DeInit(spi);
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if (0) {
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#if MICROPY_HW_ENABLE_SPI1
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} else if (spi->Instance == SPI1) {
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__SPI1_FORCE_RESET();
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__SPI1_RELEASE_RESET();
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__SPI1_CLK_DISABLE();
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#endif
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#if MICROPY_HW_ENABLE_SPI2
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} else if (spi->Instance == SPI2) {
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__SPI2_FORCE_RESET();
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__SPI2_RELEASE_RESET();
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__SPI2_CLK_DISABLE();
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#endif
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#if MICROPY_HW_ENABLE_SPI3
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} else if (spi->Instance == SPI3) {
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__SPI3_FORCE_RESET();
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__SPI3_RELEASE_RESET();
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__SPI3_CLK_DISABLE();
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#endif
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}
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}
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STATIC HAL_StatusTypeDef spi_wait_dma_finished(SPI_HandleTypeDef *spi, uint32_t timeout) {
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// Note: we can't use WFI to idle in this loop because the DMA completion
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// interrupt may occur before the WFI. Hence we miss it and have to wait
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// until the next sys-tick (up to 1ms).
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uint32_t start = HAL_GetTick();
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while (HAL_SPI_GetState(spi) != HAL_SPI_STATE_READY) {
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if (HAL_GetTick() - start >= timeout) {
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return HAL_TIMEOUT;
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}
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}
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return HAL_OK;
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}
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/******************************************************************************/
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/* Micro Python bindings */
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SPI_HandleTypeDef *spi_get_handle(mp_obj_t o) {
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if (!MP_OBJ_IS_TYPE(o, &pyb_spi_type)) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "expecting an SPI object"));
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}
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pyb_spi_obj_t *self = o;
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return self->spi;
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}
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STATIC void pyb_spi_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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pyb_spi_obj_t *self = self_in;
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uint spi_num;
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if (self->spi->Instance == SPI1) { spi_num = 1; }
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else if (self->spi->Instance == SPI2) { spi_num = 2; }
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else { spi_num = 3; }
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if (self->spi->State == HAL_SPI_STATE_RESET) {
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mp_printf(print, "SPI(%u)", spi_num);
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} else {
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if (self->spi->Init.Mode == SPI_MODE_MASTER) {
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// compute baudrate
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uint spi_clock;
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if (self->spi->Instance == SPI1) {
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// SPI1 is on APB2
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spi_clock = HAL_RCC_GetPCLK2Freq();
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} else {
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// SPI2 and SPI3 are on APB1
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spi_clock = HAL_RCC_GetPCLK1Freq();
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}
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uint log_prescaler = (self->spi->Init.BaudRatePrescaler >> 3) + 1;
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uint baudrate = spi_clock >> log_prescaler;
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mp_printf(print, "SPI(%u, SPI.MASTER, baudrate=%u, prescaler=%u", spi_num, baudrate, 1 << log_prescaler);
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} else {
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mp_printf(print, "SPI(%u, SPI.SLAVE", spi_num);
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}
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mp_printf(print, ", polarity=%u, phase=%u, bits=%u", self->spi->Init.CLKPolarity == SPI_POLARITY_LOW ? 0 : 1, self->spi->Init.CLKPhase == SPI_PHASE_1EDGE ? 0 : 1, self->spi->Init.DataSize == SPI_DATASIZE_8BIT ? 8 : 16);
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if (self->spi->Init.CRCCalculation == SPI_CRCCALCULATION_ENABLED) {
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mp_printf(print, ", crc=0x%x", self->spi->Init.CRCPolynomial);
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}
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mp_print_str(print, ")");
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}
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}
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/// \method init(mode, baudrate=328125, *, polarity=1, phase=0, bits=8, firstbit=SPI.MSB, ti=False, crc=None)
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///
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/// Initialise the SPI bus with the given parameters:
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///
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/// - `mode` must be either `SPI.MASTER` or `SPI.SLAVE`.
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/// - `baudrate` is the SCK clock rate (only sensible for a master).
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STATIC mp_obj_t pyb_spi_init_helper(const pyb_spi_obj_t *self, mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_mode, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 0} },
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{ MP_QSTR_baudrate, MP_ARG_INT, {.u_int = 328125} },
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{ MP_QSTR_prescaler, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0xffffffff} },
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{ MP_QSTR_polarity, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1} },
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{ MP_QSTR_phase, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
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{ MP_QSTR_dir, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = SPI_DIRECTION_2LINES} },
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{ MP_QSTR_bits, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 8} },
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{ MP_QSTR_nss, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = SPI_NSS_SOFT} },
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{ MP_QSTR_firstbit, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = SPI_FIRSTBIT_MSB} },
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{ MP_QSTR_ti, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
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{ MP_QSTR_crc, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
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};
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// parse args
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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// set the SPI configuration values
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SPI_InitTypeDef *init = &self->spi->Init;
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init->Mode = args[0].u_int;
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// configure the prescaler
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mp_uint_t br_prescale = args[2].u_int;
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if (br_prescale == 0xffffffff) {
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// prescaler not given, so select one that yields at most the requested baudrate
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mp_uint_t spi_clock;
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if (self->spi->Instance == SPI1) {
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// SPI1 is on APB2
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spi_clock = HAL_RCC_GetPCLK2Freq();
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} else {
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// SPI2 and SPI3 are on APB1
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spi_clock = HAL_RCC_GetPCLK1Freq();
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}
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br_prescale = spi_clock / args[1].u_int;
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}
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if (br_prescale <= 2) { init->BaudRatePrescaler = SPI_BAUDRATEPRESCALER_2; }
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else if (br_prescale <= 4) { init->BaudRatePrescaler = SPI_BAUDRATEPRESCALER_4; }
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else if (br_prescale <= 8) { init->BaudRatePrescaler = SPI_BAUDRATEPRESCALER_8; }
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else if (br_prescale <= 16) { init->BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16; }
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else if (br_prescale <= 32) { init->BaudRatePrescaler = SPI_BAUDRATEPRESCALER_32; }
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else if (br_prescale <= 64) { init->BaudRatePrescaler = SPI_BAUDRATEPRESCALER_64; }
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else if (br_prescale <= 128) { init->BaudRatePrescaler = SPI_BAUDRATEPRESCALER_128; }
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else { init->BaudRatePrescaler = SPI_BAUDRATEPRESCALER_256; }
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init->CLKPolarity = args[3].u_int == 0 ? SPI_POLARITY_LOW : SPI_POLARITY_HIGH;
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init->CLKPhase = args[4].u_int == 0 ? SPI_PHASE_1EDGE : SPI_PHASE_2EDGE;
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init->Direction = args[5].u_int;
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init->DataSize = (args[6].u_int == 16) ? SPI_DATASIZE_16BIT : SPI_DATASIZE_8BIT;
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init->NSS = args[7].u_int;
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init->FirstBit = args[8].u_int;
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init->TIMode = args[9].u_bool ? SPI_TIMODE_ENABLED : SPI_TIMODE_DISABLED;
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if (args[10].u_obj == mp_const_none) {
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init->CRCCalculation = SPI_CRCCALCULATION_DISABLED;
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init->CRCPolynomial = 0;
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} else {
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init->CRCCalculation = SPI_CRCCALCULATION_ENABLED;
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init->CRCPolynomial = mp_obj_get_int(args[10].u_obj);
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}
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// init the SPI bus
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spi_init(self->spi, init->NSS != SPI_NSS_SOFT);
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return mp_const_none;
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}
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/// \classmethod \constructor(bus, ...)
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///
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/// Construct an SPI object on the given bus. `bus` can be 1 or 2.
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/// With no additional parameters, the SPI object is created but not
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/// initialised (it has the settings from the last initialisation of
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/// the bus, if any). If extra arguments are given, the bus is initialised.
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/// See `init` for parameters of initialisation.
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///
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/// The physical pins of the SPI busses are:
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///
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/// - `SPI(1)` is on the X position: `(NSS, SCK, MISO, MOSI) = (X5, X6, X7, X8) = (PA4, PA5, PA6, PA7)`
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/// - `SPI(2)` is on the Y position: `(NSS, SCK, MISO, MOSI) = (Y5, Y6, Y7, Y8) = (PB12, PB13, PB14, PB15)`
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///
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/// At the moment, the NSS pin is not used by the SPI driver and is free
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/// for other use.
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STATIC mp_obj_t pyb_spi_make_new(mp_obj_t type_in, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
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// check arguments
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mp_arg_check_num(n_args, n_kw, 1, MP_OBJ_FUN_ARGS_MAX, true);
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// work out SPI bus
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int spi_id = 0;
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if (MP_OBJ_IS_STR(args[0])) {
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const char *port = mp_obj_str_get_str(args[0]);
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if (0) {
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#ifdef MICROPY_HW_SPI1_NAME
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} else if (strcmp(port, MICROPY_HW_SPI1_NAME) == 0) {
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spi_id = 1;
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#endif
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#ifdef MICROPY_HW_SPI2_NAME
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} else if (strcmp(port, MICROPY_HW_SPI2_NAME) == 0) {
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spi_id = 2;
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#endif
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#ifdef MICROPY_HW_SPI3_NAME
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} else if (strcmp(port, MICROPY_HW_SPI3_NAME) == 0) {
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spi_id = 3;
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#endif
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} else {
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
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"SPI(%s) does not exist", port));
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}
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} else {
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spi_id = mp_obj_get_int(args[0]);
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if (spi_id < 1 || spi_id > MP_ARRAY_SIZE(pyb_spi_obj)
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|| pyb_spi_obj[spi_id - 1].spi == NULL) {
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
|
|
"SPI(%d) does not exist", spi_id));
|
|
}
|
|
}
|
|
|
|
// get SPI object
|
|
const pyb_spi_obj_t *spi_obj = &pyb_spi_obj[spi_id - 1];
|
|
|
|
if (n_args > 1 || n_kw > 0) {
|
|
// start the peripheral
|
|
mp_map_t kw_args;
|
|
mp_map_init_fixed_table(&kw_args, n_kw, args + n_args);
|
|
pyb_spi_init_helper(spi_obj, n_args - 1, args + 1, &kw_args);
|
|
}
|
|
|
|
return (mp_obj_t)spi_obj;
|
|
}
|
|
|
|
STATIC mp_obj_t pyb_spi_init(mp_uint_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
|
|
return pyb_spi_init_helper(args[0], n_args - 1, args + 1, kw_args);
|
|
}
|
|
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_spi_init_obj, 1, pyb_spi_init);
|
|
|
|
/// \method deinit()
|
|
/// Turn off the SPI bus.
|
|
STATIC mp_obj_t pyb_spi_deinit(mp_obj_t self_in) {
|
|
pyb_spi_obj_t *self = self_in;
|
|
spi_deinit(self->spi);
|
|
return mp_const_none;
|
|
}
|
|
STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_spi_deinit_obj, pyb_spi_deinit);
|
|
|
|
/// \method send(send, *, timeout=5000)
|
|
/// Send data on the bus:
|
|
///
|
|
/// - `send` is the data to send (an integer to send, or a buffer object).
|
|
/// - `timeout` is the timeout in milliseconds to wait for the send.
|
|
///
|
|
/// Return value: `None`.
|
|
STATIC mp_obj_t pyb_spi_send(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
|
|
// TODO assumes transmission size is 8-bits wide
|
|
|
|
static const mp_arg_t allowed_args[] = {
|
|
{ MP_QSTR_send, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
|
|
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
|
|
};
|
|
|
|
// parse args
|
|
pyb_spi_obj_t *self = pos_args[0];
|
|
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
|
|
mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
|
|
|
|
// get the buffer to send from
|
|
mp_buffer_info_t bufinfo;
|
|
uint8_t data[1];
|
|
pyb_buf_get_for_send(args[0].u_obj, &bufinfo, data);
|
|
|
|
// send the data
|
|
HAL_StatusTypeDef status;
|
|
if (query_irq() == IRQ_STATE_DISABLED) {
|
|
status = HAL_SPI_Transmit(self->spi, bufinfo.buf, bufinfo.len, args[1].u_int);
|
|
} else {
|
|
DMA_HandleTypeDef tx_dma;
|
|
dma_init(&tx_dma, self->tx_dma_stream, self->tx_dma_channel, DMA_MEMORY_TO_PERIPH, self->spi);
|
|
self->spi->hdmatx = &tx_dma;
|
|
self->spi->hdmarx = NULL;
|
|
status = HAL_SPI_Transmit_DMA(self->spi, bufinfo.buf, bufinfo.len);
|
|
if (status == HAL_OK) {
|
|
status = spi_wait_dma_finished(self->spi, args[1].u_int);
|
|
}
|
|
dma_deinit(&tx_dma);
|
|
}
|
|
|
|
if (status != HAL_OK) {
|
|
mp_hal_raise(status);
|
|
}
|
|
|
|
return mp_const_none;
|
|
}
|
|
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_spi_send_obj, 1, pyb_spi_send);
|
|
|
|
/// \method recv(recv, *, timeout=5000)
|
|
///
|
|
/// Receive data on the bus:
|
|
///
|
|
/// - `recv` can be an integer, which is the number of bytes to receive,
|
|
/// or a mutable buffer, which will be filled with received bytes.
|
|
/// - `timeout` is the timeout in milliseconds to wait for the receive.
|
|
///
|
|
/// Return value: if `recv` is an integer then a new buffer of the bytes received,
|
|
/// otherwise the same buffer that was passed in to `recv`.
|
|
STATIC mp_obj_t pyb_spi_recv(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
|
|
// TODO assumes transmission size is 8-bits wide
|
|
|
|
static const mp_arg_t allowed_args[] = {
|
|
{ MP_QSTR_recv, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
|
|
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
|
|
};
|
|
|
|
// parse args
|
|
pyb_spi_obj_t *self = pos_args[0];
|
|
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
|
|
mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
|
|
|
|
// get the buffer to receive into
|
|
vstr_t vstr;
|
|
mp_obj_t o_ret = pyb_buf_get_for_recv(args[0].u_obj, &vstr);
|
|
|
|
// receive the data
|
|
HAL_StatusTypeDef status;
|
|
if (query_irq() == IRQ_STATE_DISABLED) {
|
|
status = HAL_SPI_Receive(self->spi, (uint8_t*)vstr.buf, vstr.len, args[1].u_int);
|
|
} else {
|
|
DMA_HandleTypeDef tx_dma, rx_dma;
|
|
if (self->spi->Init.Mode == SPI_MODE_MASTER) {
|
|
// in master mode the HAL actually does a TransmitReceive call
|
|
dma_init(&tx_dma, self->tx_dma_stream, self->tx_dma_channel, DMA_MEMORY_TO_PERIPH, self->spi);
|
|
self->spi->hdmatx = &tx_dma;
|
|
} else {
|
|
self->spi->hdmatx = NULL;
|
|
}
|
|
dma_init(&rx_dma, self->rx_dma_stream, self->rx_dma_channel, DMA_PERIPH_TO_MEMORY, self->spi);
|
|
self->spi->hdmarx = &rx_dma;
|
|
|
|
status = HAL_SPI_Receive_DMA(self->spi, (uint8_t*)vstr.buf, vstr.len);
|
|
if (status == HAL_OK) {
|
|
status = spi_wait_dma_finished(self->spi, args[1].u_int);
|
|
}
|
|
dma_deinit(&tx_dma);
|
|
dma_deinit(&rx_dma);
|
|
}
|
|
|
|
if (status != HAL_OK) {
|
|
mp_hal_raise(status);
|
|
}
|
|
|
|
// return the received data
|
|
if (o_ret != MP_OBJ_NULL) {
|
|
return o_ret;
|
|
} else {
|
|
return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
|
|
}
|
|
}
|
|
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_spi_recv_obj, 1, pyb_spi_recv);
|
|
|
|
/// \method send_recv(send, recv=None, *, timeout=5000)
|
|
///
|
|
/// Send and receive data on the bus at the same time:
|
|
///
|
|
/// - `send` is the data to send (an integer to send, or a buffer object).
|
|
/// - `recv` is a mutable buffer which will be filled with received bytes.
|
|
/// It can be the same as `send`, or omitted. If omitted, a new buffer will
|
|
/// be created.
|
|
/// - `timeout` is the timeout in milliseconds to wait for the receive.
|
|
///
|
|
/// Return value: the buffer with the received bytes.
|
|
STATIC mp_obj_t pyb_spi_send_recv(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
|
|
// TODO assumes transmission size is 8-bits wide
|
|
|
|
static const mp_arg_t allowed_args[] = {
|
|
{ MP_QSTR_send, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
|
|
{ MP_QSTR_recv, MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
|
|
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
|
|
};
|
|
|
|
// parse args
|
|
pyb_spi_obj_t *self = pos_args[0];
|
|
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
|
|
mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
|
|
|
|
// get buffers to send from/receive to
|
|
mp_buffer_info_t bufinfo_send;
|
|
uint8_t data_send[1];
|
|
mp_buffer_info_t bufinfo_recv;
|
|
vstr_t vstr_recv;
|
|
mp_obj_t o_ret;
|
|
|
|
if (args[0].u_obj == args[1].u_obj) {
|
|
// same object for send and receive, it must be a r/w buffer
|
|
mp_get_buffer_raise(args[0].u_obj, &bufinfo_send, MP_BUFFER_RW);
|
|
bufinfo_recv = bufinfo_send;
|
|
o_ret = args[0].u_obj;
|
|
} else {
|
|
// get the buffer to send from
|
|
pyb_buf_get_for_send(args[0].u_obj, &bufinfo_send, data_send);
|
|
|
|
// get the buffer to receive into
|
|
if (args[1].u_obj == MP_OBJ_NULL) {
|
|
// only send argument given, so create a fresh buffer of the send length
|
|
vstr_init_len(&vstr_recv, bufinfo_send.len);
|
|
bufinfo_recv.len = vstr_recv.len;
|
|
bufinfo_recv.buf = vstr_recv.buf;
|
|
o_ret = MP_OBJ_NULL;
|
|
} else {
|
|
// recv argument given
|
|
mp_get_buffer_raise(args[1].u_obj, &bufinfo_recv, MP_BUFFER_WRITE);
|
|
if (bufinfo_recv.len != bufinfo_send.len) {
|
|
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "recv must be same length as send"));
|
|
}
|
|
o_ret = args[1].u_obj;
|
|
}
|
|
}
|
|
|
|
// send and receive the data
|
|
HAL_StatusTypeDef status;
|
|
if (query_irq() == IRQ_STATE_DISABLED) {
|
|
status = HAL_SPI_TransmitReceive(self->spi, bufinfo_send.buf, bufinfo_recv.buf, bufinfo_send.len, args[2].u_int);
|
|
} else {
|
|
DMA_HandleTypeDef tx_dma, rx_dma;
|
|
dma_init(&tx_dma, self->tx_dma_stream, self->tx_dma_channel, DMA_MEMORY_TO_PERIPH, self->spi);
|
|
self->spi->hdmatx = &tx_dma;
|
|
dma_init(&rx_dma, self->rx_dma_stream, self->rx_dma_channel, DMA_PERIPH_TO_MEMORY, self->spi);
|
|
self->spi->hdmarx = &rx_dma;
|
|
status = HAL_SPI_TransmitReceive_DMA(self->spi, bufinfo_send.buf, bufinfo_recv.buf, bufinfo_send.len);
|
|
if (status == HAL_OK) {
|
|
status = spi_wait_dma_finished(self->spi, args[2].u_int);
|
|
}
|
|
dma_deinit(&tx_dma);
|
|
dma_deinit(&rx_dma);
|
|
}
|
|
|
|
if (status != HAL_OK) {
|
|
mp_hal_raise(status);
|
|
}
|
|
|
|
// return the received data
|
|
if (o_ret != MP_OBJ_NULL) {
|
|
return o_ret;
|
|
} else {
|
|
return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr_recv);
|
|
}
|
|
}
|
|
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_spi_send_recv_obj, 1, pyb_spi_send_recv);
|
|
|
|
STATIC const mp_map_elem_t pyb_spi_locals_dict_table[] = {
|
|
// instance methods
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR_init), (mp_obj_t)&pyb_spi_init_obj },
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR_deinit), (mp_obj_t)&pyb_spi_deinit_obj },
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR_send), (mp_obj_t)&pyb_spi_send_obj },
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR_recv), (mp_obj_t)&pyb_spi_recv_obj },
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR_send_recv), (mp_obj_t)&pyb_spi_send_recv_obj },
|
|
|
|
// class constants
|
|
/// \constant MASTER - for initialising the bus to master mode
|
|
/// \constant SLAVE - for initialising the bus to slave mode
|
|
/// \constant MSB - set the first bit to MSB
|
|
/// \constant LSB - set the first bit to LSB
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR_MASTER), MP_OBJ_NEW_SMALL_INT(SPI_MODE_MASTER) },
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR_SLAVE), MP_OBJ_NEW_SMALL_INT(SPI_MODE_SLAVE) },
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR_MSB), MP_OBJ_NEW_SMALL_INT(SPI_FIRSTBIT_MSB) },
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR_LSB), MP_OBJ_NEW_SMALL_INT(SPI_FIRSTBIT_LSB) },
|
|
/* TODO
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR_DIRECTION_2LINES ((uint32_t)0x00000000)
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR_DIRECTION_2LINES_RXONLY SPI_CR1_RXONLY
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR_DIRECTION_1LINE SPI_CR1_BIDIMODE
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR_NSS_SOFT SPI_CR1_SSM
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR_NSS_HARD_INPUT ((uint32_t)0x00000000)
|
|
{ MP_OBJ_NEW_QSTR(MP_QSTR_NSS_HARD_OUTPUT ((uint32_t)0x00040000)
|
|
*/
|
|
};
|
|
|
|
STATIC MP_DEFINE_CONST_DICT(pyb_spi_locals_dict, pyb_spi_locals_dict_table);
|
|
|
|
const mp_obj_type_t pyb_spi_type = {
|
|
{ &mp_type_type },
|
|
.name = MP_QSTR_SPI,
|
|
.print = pyb_spi_print,
|
|
.make_new = pyb_spi_make_new,
|
|
.locals_dict = (mp_obj_t)&pyb_spi_locals_dict,
|
|
};
|