djsundog/circuitpython
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

stmhal: Make SPI bus use DMA for transfers.

Browse Source 
Uses DMA if interrupts are enabled, polling if they are disabled.
This commit is contained in:
Damien George 2014-12-02 23:41:30 +00:00
parent d4f80f58b8
commit 9de6773237
1 changed files with 214 additions and 70 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

262
stmhal/spi.c
View File

@ -33,6 +33,7 @@
#include "qstr.h"
#include "obj.h"
#include "runtime.h"
#include "irq.h"
#include "pin.h"
#include "genhdr/pins.h"
#include "bufhelper.h"
@ -71,6 +72,60 @@ SPI_HandleTypeDef SPIHandle2 = {.Instance = NULL};
SPI_HandleTypeDef SPIHandle3 = {.Instance = NULL};
#endif
// Possible DMA configurations for SPI busses:
// SPI1_RX: DMA2_Stream0.CHANNEL_3 or DMA2_Stream2.CHANNEL_3
// SPI1_TX: DMA2_Stream3.CHANNEL_3 or DMA2_Stream5.CHANNEL_3
// SPI2_RX: DMA1_Stream3.CHANNEL_0
// SPI2_TX: DMA1_Stream4.CHANNEL_0
// SPI3_RX: DMA1_Stream0.CHANNEL_0 or DMA1_Stream2.CHANNEL_0
// SPI3_TX: DMA1_Stream5.CHANNEL_0 or DMA1_Stream7.CHANNEL_0
#define SPI1_DMA_CLK_ENABLE __DMA2_CLK_ENABLE
#define SPI1_RX_DMA_STREAM (DMA2_Stream2)
#define SPI1_TX_DMA_STREAM (DMA2_Stream5)
#define SPI1_DMA_CHANNEL (DMA_CHANNEL_3)
#define SPI1_RX_DMA_IRQN (DMA2_Stream2_IRQn)
#define SPI1_TX_DMA_IRQN (DMA2_Stream5_IRQn)
#define SPI1_RX_DMA_IRQ_HANDLER DMA2_Stream2_IRQHandler
#define SPI1_TX_DMA_IRQ_HANDLER DMA2_Stream5_IRQHandler
#define SPI2_DMA_CLK_ENABLE __DMA1_CLK_ENABLE
#define SPI2_RX_DMA_STREAM (DMA1_Stream3)
#define SPI2_TX_DMA_STREAM (DMA1_Stream4)
#define SPI2_DMA_CHANNEL (DMA_CHANNEL_0)
#define SPI2_RX_DMA_IRQN (DMA1_Stream3_IRQn)
#define SPI2_TX_DMA_IRQN (DMA1_Stream4_IRQn)
#define SPI2_RX_DMA_IRQ_HANDLER DMA1_Stream3_IRQHandler
#define SPI2_TX_DMA_IRQ_HANDLER DMA1_Stream4_IRQHandler
#define SPI3_DMA_CLK_ENABLE __DMA1_CLK_ENABLE
#define SPI3_RX_DMA_STREAM (DMA1_Stream2)
#define SPI3_TX_DMA_STREAM (DMA1_Stream7)
#define SPI3_DMA_CHANNEL (DMA_CHANNEL_0)
#define SPI3_RX_DMA_IRQN (DMA1_Stream2_IRQn)
#define SPI3_TX_DMA_IRQN (DMA1_Stream7_IRQn)
#define SPI3_RX_DMA_IRQ_HANDLER DMA1_Stream2_IRQHandler
#define SPI3_TX_DMA_IRQ_HANDLER DMA1_Stream7_IRQHandler
#if MICROPY_HW_ENABLE_SPI1
STATIC DMA_HandleTypeDef spi1_rx_dma_handle;
STATIC DMA_HandleTypeDef spi1_tx_dma_handle;
void SPI1_RX_DMA_IRQ_HANDLER(void) { HAL_DMA_IRQHandler(&spi1_rx_dma_handle); }
void SPI1_TX_DMA_IRQ_HANDLER(void) { HAL_DMA_IRQHandler(&spi1_tx_dma_handle); }
#endif
STATIC DMA_HandleTypeDef spi2_rx_dma_handle;
STATIC DMA_HandleTypeDef spi2_tx_dma_handle;
void SPI2_RX_DMA_IRQ_HANDLER(void) { HAL_DMA_IRQHandler(&spi2_rx_dma_handle); }
void SPI2_TX_DMA_IRQ_HANDLER(void) { HAL_DMA_IRQHandler(&spi2_tx_dma_handle); }
#if MICROPY_HW_ENABLE_SPI3
STATIC DMA_HandleTypeDef spi3_rx_dma_handle;
STATIC DMA_HandleTypeDef spi3_tx_dma_handle;
void SPI3_RX_DMA_IRQ_HANDLER(void) { HAL_DMA_IRQHandler(&spi3_rx_dma_handle); }
void SPI3_TX_DMA_IRQ_HANDLER(void) { HAL_DMA_IRQHandler(&spi3_tx_dma_handle); }
#endif
void spi_init0(void) {
// reset the SPI handles
#if MICROPY_HW_ENABLE_SPI1
@ -93,6 +148,9 @@ void spi_init(SPI_HandleTypeDef *spi, bool enable_nss_pin) {
GPIO_InitStructure.Speed = GPIO_SPEED_FAST;
GPIO_InitStructure.Pull = spi->Init.CLKPolarity == SPI_POLARITY_LOW ? GPIO_PULLDOWN : GPIO_PULLUP;
DMA_HandleTypeDef *rx_dma, *tx_dma;
IRQn_Type rx_dma_irqn, tx_dma_irqn;
const pin_obj_t *pins[4];
if (0) {
#if MICROPY_HW_ENABLE_SPI1
@ -105,6 +163,15 @@ void spi_init(SPI_HandleTypeDef *spi, bool enable_nss_pin) {
GPIO_InitStructure.Alternate = GPIO_AF5_SPI1;
// enable the SPI clock
__SPI1_CLK_ENABLE();
// configure DMA
SPI1_DMA_CLK_ENABLE();
spi1_rx_dma_handle.Instance = SPI1_RX_DMA_STREAM;
spi1_rx_dma_handle.Init.Channel = SPI1_DMA_CHANNEL;
spi1_tx_dma_handle.Instance = SPI1_TX_DMA_STREAM;
rx_dma = &spi1_rx_dma_handle;
tx_dma = &spi1_tx_dma_handle;
rx_dma_irqn = SPI1_RX_DMA_IRQN;
tx_dma_irqn = SPI1_TX_DMA_IRQN;
#endif
} else if (spi->Instance == SPI2) {
// Y-skin: Y5=PB12=SPI2_NSS, Y6=PB13=SPI2_SCK, Y7=PB14=SPI2_MISO, Y8=PB15=SPI2_MOSI
@ -115,6 +182,15 @@ void spi_init(SPI_HandleTypeDef *spi, bool enable_nss_pin) {
GPIO_InitStructure.Alternate = GPIO_AF5_SPI2;
// enable the SPI clock
__SPI2_CLK_ENABLE();
// configure DMA
SPI2_DMA_CLK_ENABLE();
spi2_rx_dma_handle.Instance = SPI2_RX_DMA_STREAM;
spi2_rx_dma_handle.Init.Channel = SPI2_DMA_CHANNEL;
spi2_tx_dma_handle.Instance = SPI2_TX_DMA_STREAM;
rx_dma = &spi2_rx_dma_handle;
tx_dma = &spi2_tx_dma_handle;
rx_dma_irqn = SPI2_RX_DMA_IRQN;
tx_dma_irqn = SPI2_TX_DMA_IRQN;
#if MICROPY_HW_ENABLE_SPI3
} else if (spi->Instance == SPI3) {
pins[0] = &pin_A4;
@ -124,6 +200,15 @@ void spi_init(SPI_HandleTypeDef *spi, bool enable_nss_pin) {
GPIO_InitStructure.Alternate = GPIO_AF6_SPI3;
// enable the SPI clock
__SPI3_CLK_ENABLE();
// configure DMA
SPI3_DMA_CLK_ENABLE();
spi3_rx_dma_handle.Instance = SPI3_RX_DMA_STREAM;
spi3_rx_dma_handle.Init.Channel = SPI3_DMA_CHANNEL;
spi3_tx_dma_handle.Instance = SPI3_TX_DMA_STREAM;
rx_dma = &spi3_rx_dma_handle;
tx_dma = &spi3_tx_dma_handle;
rx_dma_irqn = SPI3_RX_DMA_IRQN;
tx_dma_irqn = SPI3_TX_DMA_IRQN;
#endif
} else {
// SPI does not exist for this board (shouldn't get here, should be checked by caller)
@ -143,6 +228,37 @@ void spi_init(SPI_HandleTypeDef *spi, bool enable_nss_pin) {
printf("OSError: HAL_SPI_Init failed\n");
return;
}
// configure DMA
rx_dma->Init.Direction = DMA_PERIPH_TO_MEMORY;
rx_dma->Init.PeriphInc = DMA_PINC_DISABLE;
rx_dma->Init.MemInc = DMA_MINC_ENABLE;
rx_dma->Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
rx_dma->Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
rx_dma->Init.Mode = DMA_NORMAL;
rx_dma->Init.Priority = DMA_PRIORITY_LOW;
rx_dma->Init.FIFOMode = DMA_FIFOMODE_DISABLE;
rx_dma->Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;
rx_dma->Init.MemBurst = DMA_MBURST_INC4;
rx_dma->Init.PeriphBurst = DMA_PBURST_INC4;
tx_dma->Init = rx_dma->Init; // copy rx settings
tx_dma->Init.Direction = DMA_MEMORY_TO_PERIPH;
__HAL_LINKDMA(spi, hdmarx, *rx_dma);
HAL_DMA_DeInit(rx_dma);
HAL_DMA_Init(rx_dma);
__HAL_LINKDMA(spi, hdmatx, *tx_dma);
HAL_DMA_DeInit(tx_dma);
HAL_DMA_Init(tx_dma);
// Enable the relevant IRQs.
HAL_NVIC_SetPriority(rx_dma_irqn, 6, 0);
HAL_NVIC_EnableIRQ(rx_dma_irqn);
HAL_NVIC_SetPriority(tx_dma_irqn, 6, 0);
HAL_NVIC_EnableIRQ(tx_dma_irqn);
}
void spi_deinit(SPI_HandleTypeDef *spi) {
@ -167,6 +283,17 @@ void spi_deinit(SPI_HandleTypeDef *spi) {
}
}
STATIC HAL_StatusTypeDef spi_wait_dma_finished(SPI_HandleTypeDef *spi, uint32_t timeout) {
uint32_t start = HAL_GetTick();
while (HAL_SPI_GetState(spi) != HAL_SPI_STATE_READY) {
if (HAL_GetTick() - start >= timeout) {
return HAL_TIMEOUT;
}
__WFI();
}
return HAL_OK;
}
/******************************************************************************/
/* Micro Python bindings */
@ -238,7 +365,8 @@ STATIC void pyb_spi_print(void (*print)(void *env, const char *fmt, ...), void *
///
/// - `mode` must be either `SPI.MASTER` or `SPI.SLAVE`.
/// - `baudrate` is the SCK clock rate (only sensible for a master).
STATIC const mp_arg_t pyb_spi_init_args[] = {
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) {
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_mode, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_baudrate, MP_ARG_INT, {.u_int = 328125} },
{ MP_QSTR_polarity, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1} },
@ -249,17 +377,15 @@ STATIC const mp_arg_t pyb_spi_init_args[] = {
{ MP_QSTR_firstbit, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = SPI_FIRSTBIT_MSB} },
{ MP_QSTR_ti, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
{ MP_QSTR_crc, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
};
#define PYB_SPI_INIT_NUM_ARGS MP_ARRAY_SIZE(pyb_spi_init_args)
};
STATIC mp_obj_t pyb_spi_init_helper(const pyb_spi_obj_t *self, mp_uint_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
// parse args
mp_arg_val_t vals[PYB_SPI_INIT_NUM_ARGS];
mp_arg_parse_all(n_args, args, kw_args, PYB_SPI_INIT_NUM_ARGS, pyb_spi_init_args, vals);
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
// set the SPI configuration values
SPI_InitTypeDef *init = &self->spi->Init;
init->Mode = vals[0].u_int;
init->Mode = args[0].u_int;
// compute the baudrate prescaler from the requested baudrate
// select a prescaler that yields at most the requested baudrate
@ -271,7 +397,7 @@ STATIC mp_obj_t pyb_spi_init_helper(const pyb_spi_obj_t *self, mp_uint_t n_args,
// SPI2 and SPI3 are on APB1
spi_clock = HAL_RCC_GetPCLK1Freq();
}
uint br_prescale = spi_clock / vals[1].u_int;
uint br_prescale = spi_clock / args[1].u_int;
if (br_prescale <= 2) { init->BaudRatePrescaler = SPI_BAUDRATEPRESCALER_2; }
else if (br_prescale <= 4) { init->BaudRatePrescaler = SPI_BAUDRATEPRESCALER_4; }
else if (br_prescale <= 8) { init->BaudRatePrescaler = SPI_BAUDRATEPRESCALER_8; }
@ -281,19 +407,19 @@ STATIC mp_obj_t pyb_spi_init_helper(const pyb_spi_obj_t *self, mp_uint_t n_args,
else if (br_prescale <= 128) { init->BaudRatePrescaler = SPI_BAUDRATEPRESCALER_128; }
else { init->BaudRatePrescaler = SPI_BAUDRATEPRESCALER_256; }
init->CLKPolarity = vals[2].u_int == 0 ? SPI_POLARITY_LOW : SPI_POLARITY_HIGH;
init->CLKPhase = vals[3].u_int == 0 ? SPI_PHASE_1EDGE : SPI_PHASE_2EDGE;
init->Direction = vals[4].u_int;
init->DataSize = (vals[5].u_int == 16) ? SPI_DATASIZE_16BIT : SPI_DATASIZE_8BIT;
init->NSS = vals[6].u_int;
init->FirstBit = vals[7].u_int;
init->TIMode = vals[8].u_bool ? SPI_TIMODE_ENABLED : SPI_TIMODE_DISABLED;
if (vals[9].u_obj == mp_const_none) {
init->CLKPolarity = args[2].u_int == 0 ? SPI_POLARITY_LOW : SPI_POLARITY_HIGH;
init->CLKPhase = args[3].u_int == 0 ? SPI_PHASE_1EDGE : SPI_PHASE_2EDGE;
init->Direction = args[4].u_int;
init->DataSize = (args[5].u_int == 16) ? SPI_DATASIZE_16BIT : SPI_DATASIZE_8BIT;
init->NSS = args[6].u_int;
init->FirstBit = args[7].u_int;
init->TIMode = args[8].u_bool ? SPI_TIMODE_ENABLED : SPI_TIMODE_DISABLED;
if (args[9].u_obj == mp_const_none) {
init->CRCCalculation = SPI_CRCCALCULATION_DISABLED;
init->CRCPolynomial = 0;
} else {
init->CRCCalculation = SPI_CRCCALCULATION_ENABLED;
init->CRCPolynomial = mp_obj_get_int(vals[9].u_obj);
init->CRCPolynomial = mp_obj_get_int(args[9].u_obj);
}
// init the SPI bus
@ -363,28 +489,34 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_spi_deinit_obj, pyb_spi_deinit);
/// - `timeout` is the timeout in milliseconds to wait for the send.
///
/// Return value: `None`.
STATIC const mp_arg_t pyb_spi_send_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} },
};
#define PYB_SPI_SEND_NUM_ARGS MP_ARRAY_SIZE(pyb_spi_send_args)
STATIC mp_obj_t pyb_spi_send(mp_uint_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
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
pyb_spi_obj_t *self = args[0];
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
mp_arg_val_t vals[PYB_SPI_SEND_NUM_ARGS];
mp_arg_parse_all(n_args - 1, args + 1, kw_args, PYB_SPI_SEND_NUM_ARGS, pyb_spi_send_args, vals);
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(vals[0].u_obj, &bufinfo, data);
pyb_buf_get_for_send(args[0].u_obj, &bufinfo, data);
// send the data
HAL_StatusTypeDef status = HAL_SPI_Transmit(self->spi, bufinfo.buf, bufinfo.len, vals[1].u_int);
HAL_StatusTypeDef status;
if (query_irq() == IRQ_STATE_DISABLED) {
status = HAL_SPI_Transmit(self->spi, bufinfo.buf, bufinfo.len, args[1].u_int);
} else {
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);
}
}
if (status != HAL_OK) {
mp_hal_raise(status);
@ -404,27 +536,33 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_spi_send_obj, 1, pyb_spi_send);
///
/// 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 const mp_arg_t pyb_spi_recv_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} },
};
#define PYB_SPI_RECV_NUM_ARGS MP_ARRAY_SIZE(pyb_spi_recv_args)
STATIC mp_obj_t pyb_spi_recv(mp_uint_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
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
pyb_spi_obj_t *self = args[0];
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
mp_arg_val_t vals[PYB_SPI_RECV_NUM_ARGS];
mp_arg_parse_all(n_args - 1, args + 1, kw_args, PYB_SPI_RECV_NUM_ARGS, pyb_spi_recv_args, vals);
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
mp_buffer_info_t bufinfo;
mp_obj_t o_ret = pyb_buf_get_for_recv(vals[0].u_obj, &bufinfo);
mp_obj_t o_ret = pyb_buf_get_for_recv(args[0].u_obj, &bufinfo);
// receive the data
HAL_StatusTypeDef status = HAL_SPI_Receive(self->spi, bufinfo.buf, bufinfo.len, vals[1].u_int);
HAL_StatusTypeDef status;
if (query_irq() == IRQ_STATE_DISABLED) {
status = HAL_SPI_Receive(self->spi, bufinfo.buf, bufinfo.len, args[1].u_int);
} else {
status = HAL_SPI_Receive_DMA(self->spi, bufinfo.buf, bufinfo.len);
if (status == HAL_OK) {
status = spi_wait_dma_finished(self->spi, args[1].u_int);
}
}
if (status != HAL_OK) {
mp_hal_raise(status);
@ -432,7 +570,7 @@ STATIC mp_obj_t pyb_spi_recv(mp_uint_t n_args, const mp_obj_t *args, mp_map_t *k
// return the received data
if (o_ret == MP_OBJ_NULL) {
return vals[0].u_obj;
return args[0].u_obj;
} else {
return mp_obj_str_builder_end(o_ret);
}
@ -450,21 +588,19 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_spi_recv_obj, 1, pyb_spi_recv);
/// - `timeout` is the timeout in milliseconds to wait for the receive.
///
/// Return value: the buffer with the received bytes.
STATIC const mp_arg_t pyb_spi_send_recv_args[] = {
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} },
};
#define PYB_SPI_SEND_RECV_NUM_ARGS MP_ARRAY_SIZE(pyb_spi_send_recv_args)
STATIC mp_obj_t pyb_spi_send_recv(mp_uint_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
// TODO assumes transmission size is 8-bits wide
pyb_spi_obj_t *self = args[0];
};
// parse args
mp_arg_val_t vals[PYB_SPI_SEND_RECV_NUM_ARGS];
mp_arg_parse_all(n_args - 1, args + 1, kw_args, PYB_SPI_SEND_RECV_NUM_ARGS, pyb_spi_send_recv_args, vals);
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;
@ -472,24 +608,24 @@ STATIC mp_obj_t pyb_spi_send_recv(mp_uint_t n_args, const mp_obj_t *args, mp_map
mp_buffer_info_t bufinfo_recv;
mp_obj_t o_ret;
if (vals[0].u_obj == vals[1].u_obj) {
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(vals[0].u_obj, &bufinfo_send, MP_BUFFER_RW);
mp_get_buffer_raise(args[0].u_obj, &bufinfo_send, MP_BUFFER_RW);
bufinfo_recv = bufinfo_send;
o_ret = MP_OBJ_NULL;
} else {
// get the buffer to send from
pyb_buf_get_for_send(vals[0].u_obj, &bufinfo_send, data_send);
pyb_buf_get_for_send(args[0].u_obj, &bufinfo_send, data_send);
// get the buffer to receive into
if (vals[1].u_obj == MP_OBJ_NULL) {
if (args[1].u_obj == MP_OBJ_NULL) {
// only send argument given, so create a fresh buffer of the send length
bufinfo_recv.len = bufinfo_send.len;
bufinfo_recv.typecode = 'B';
o_ret = mp_obj_str_builder_start(&mp_type_bytes, bufinfo_recv.len, (byte**)&bufinfo_recv.buf);
} else {
// recv argument given
mp_get_buffer_raise(vals[1].u_obj, &bufinfo_recv, MP_BUFFER_WRITE);
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"));
}
@ -498,7 +634,15 @@ STATIC mp_obj_t pyb_spi_send_recv(mp_uint_t n_args, const mp_obj_t *args, mp_map
}
// send and receive the data
HAL_StatusTypeDef status = HAL_SPI_TransmitReceive(self->spi, bufinfo_send.buf, bufinfo_recv.buf, bufinfo_send.len, vals[2].u_int);
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 {
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);
}
}
if (status != HAL_OK) {
mp_hal_raise(status);
@ -506,7 +650,7 @@ STATIC mp_obj_t pyb_spi_send_recv(mp_uint_t n_args, const mp_obj_t *args, mp_map
// return the received data
if (o_ret == MP_OBJ_NULL) {
return vals[1].u_obj;
return args[1].u_obj;
} else {
return mp_obj_str_builder_end(o_ret);
}