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Report SPI frequency accurately on Espressif

This commit is contained in:
Dan Halbert 2023-05-11 16:57:07 -04:00
parent c75a768b59
commit d99b0634f7
1 changed files with 4 additions and 2 deletions
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6
ports/espressif/common-hal/busio/SPI.c
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@ -56,8 +56,10 @@ void spi_reset(void) {
static void set_spi_config(busio_spi_obj_t *self, static void set_spi_config(busio_spi_obj_t *self,
uint32_t baudrate, uint8_t polarity, uint8_t phase, uint8_t bits) { uint32_t baudrate, uint8_t polarity, uint8_t phase, uint8_t bits) {
// 128 is a 50% duty cycle.
const int closest_clock = spi_get_actual_clock(APB_CLK_FREQ, baudrate, 128);
const spi_device_interface_config_t device_config = { const spi_device_interface_config_t device_config = {
.clock_speed_hz = baudrate, .clock_speed_hz = closest_clock,
.mode = phase | (polarity << 1), .mode = phase | (polarity << 1),
.spics_io_num = -1, // No CS pin .spics_io_num = -1, // No CS pin
.queue_size = MAX_SPI_TRANSACTIONS, .queue_size = MAX_SPI_TRANSACTIONS,
@ -67,7 +69,7 @@ static void set_spi_config(busio_spi_obj_t *self,
if (result != ESP_OK) { if (result != ESP_OK) {
mp_raise_RuntimeError(translate("SPI configuration failed")); mp_raise_RuntimeError(translate("SPI configuration failed"));
} }
self->baudrate = baudrate; self->baudrate = closest_clock;
self->polarity = polarity; self->polarity = polarity;
self->phase = phase; self->phase = phase;
self->bits = bits; self->bits = bits;