diff options
Diffstat (limited to 'stmhal/spi.c')
| -rw-r--r-- | stmhal/spi.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/stmhal/spi.c b/stmhal/spi.c index b1aacfd0b7..864463df2d 100644 --- a/stmhal/spi.c +++ b/stmhal/spi.c @@ -476,8 +476,11 @@ STATIC mp_obj_t pyb_spi_send(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_ pyb_buf_get_for_send(args[0].u_obj, &bufinfo, data); // send the data + // Note: there seems to be a problem sending 1 byte using DMA the first + // time directly after the SPI/DMA is initialised. The cause of this is + // unknown but we sidestep the issue by using polling for 1 byte transfer. HAL_StatusTypeDef status; - if (query_irq() == IRQ_STATE_DISABLED) { + if (bufinfo.len == 1 || query_irq() == IRQ_STATE_DISABLED) { status = HAL_SPI_Transmit(self->spi, bufinfo.buf, bufinfo.len, args[1].u_int); } else { DMA_HandleTypeDef tx_dma; @@ -528,7 +531,7 @@ STATIC mp_obj_t pyb_spi_recv(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_ // receive the data HAL_StatusTypeDef status; - if (query_irq() == IRQ_STATE_DISABLED) { + if (vstr.len == 1 || 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; @@ -625,7 +628,7 @@ STATIC mp_obj_t pyb_spi_send_recv(mp_uint_t n_args, const mp_obj_t *pos_args, mp // send and receive the data HAL_StatusTypeDef status; - if (query_irq() == IRQ_STATE_DISABLED) { + if (bufinfo_send.len == 1 || 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; |