diff options
Diffstat (limited to 'stmhal/spi.c')
| -rw-r--r-- | stmhal/spi.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/stmhal/spi.c b/stmhal/spi.c index 8ec6f86275..7f805709d6 100644 --- a/stmhal/spi.c +++ b/stmhal/spi.c @@ -944,17 +944,28 @@ STATIC MP_DEFINE_CONST_DICT(machine_spi_locals_dict, machine_spi_locals_dict_tab /* code for soft implementation ***********************************************/ +// for the software SPI implementation, this is roughly the max baudrate +#define MAX_BAUDRATE (HAL_RCC_GetSysClockFreq() / 48) + STATIC uint32_t baudrate_from_delay_half(uint32_t delay_half) { - return 500000 / delay_half; + if (delay_half == MICROPY_PY_MACHINE_SPI_MIN_DELAY) { + return MAX_BAUDRATE; + } else { + return 500000 / delay_half; + } } STATIC uint32_t baudrate_to_delay_half(uint32_t baudrate) { - uint32_t delay_half = 500000 / baudrate; - // round delay_half up so that: actual_baudrate <= requested_baudrate - if (500000 % baudrate != 0) { - delay_half += 1; + if (baudrate >= MAX_BAUDRATE) { + return MICROPY_PY_MACHINE_SPI_MIN_DELAY; + } else { + uint32_t delay_half = 500000 / baudrate; + // round delay_half up so that: actual_baudrate <= requested_baudrate + if (500000 % baudrate != 0) { + delay_half += 1; + } + return delay_half; } - return delay_half; } STATIC void machine_soft_spi_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) { |