diff options
Diffstat (limited to 'stmhal/spi.c')
| -rw-r--r-- | stmhal/spi.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/stmhal/spi.c b/stmhal/spi.c index 0b9674669..d7c9b04cc 100644 --- a/stmhal/spi.c +++ b/stmhal/spi.c @@ -403,6 +403,11 @@ STATIC HAL_StatusTypeDef spi_wait_dma_finished(SPI_HandleTypeDef *spi, uint32_t return HAL_OK; } +// A transfer of "len" bytes should take len*8*1000/baudrate milliseconds. +// To simplify the calculation we assume the baudrate is never less than 8kHz +// and use that value for the baudrate in the formula, plus a small constant. +#define SPI_TRANSFER_TIMEOUT(len) ((len) + 100) + STATIC void spi_transfer(const pyb_spi_obj_t *self, size_t len, const uint8_t *src, uint8_t *dest, uint32_t timeout) { // 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 @@ -815,7 +820,7 @@ STATIC const mp_map_elem_t pyb_spi_locals_dict_table[] = { STATIC MP_DEFINE_CONST_DICT(pyb_spi_locals_dict, pyb_spi_locals_dict_table); STATIC void spi_transfer_machine(mp_obj_base_t *self_in, size_t len, const uint8_t *src, uint8_t *dest) { - spi_transfer((pyb_spi_obj_t*)self_in, len, src, dest, 100); + spi_transfer((pyb_spi_obj_t*)self_in, len, src, dest, SPI_TRANSFER_TIMEOUT(len)); } STATIC const mp_machine_spi_p_t pyb_spi_p = { @@ -932,7 +937,7 @@ STATIC void machine_hard_spi_deinit(mp_obj_base_t *self_in) { STATIC void machine_hard_spi_transfer(mp_obj_base_t *self_in, size_t len, const uint8_t *src, uint8_t *dest) { machine_hard_spi_obj_t *self = (machine_hard_spi_obj_t*)self_in; - spi_transfer(self->pyb, len, src, dest, 100); + spi_transfer(self->pyb, len, src, dest, SPI_TRANSFER_TIMEOUT(len)); } STATIC const mp_machine_spi_p_t machine_hard_spi_p = { |