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mimxrt1011: Only re-init SPI when it's actually needed 

If some crazy code (*cough* FourWire) decides to reconfigure the bus
before every transfer, it might get a bit slow...
This commit is contained in:
arturo182 2020-04-06 22:10:12 +02:00
parent e6f11947cb
commit 08f369ea96
1 changed files with 12 additions and 5 deletions
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17
ports/mimxrt10xx/common-hal/busio/SPI.c
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@ -210,6 +210,18 @@ void common_hal_busio_spi_deinit(busio_spi_obj_t *self) {
bool common_hal_busio_spi_configure(busio_spi_obj_t *self,
uint32_t baudrate, uint8_t polarity, uint8_t phase, uint8_t bits) {
LPSPI_Enable(self->spi, false);
uint32_t tcrPrescaleValue;
self->baudrate = LPSPI_MasterSetBaudRate(self->spi, baudrate, LPSPI_MASTER_CLK_FREQ, &tcrPrescaleValue);
LPSPI_Enable(self->spi, true);
if ((polarity == common_hal_busio_spi_get_polarity(self)) &&
(phase == common_hal_busio_spi_get_phase(self)) &&
(bits == ((self->spi->TCR & LPSPI_TCR_FRAMESZ_MASK) >> LPSPI_TCR_FRAMESZ_SHIFT)) + 1) {
return true;
}
lpspi_master_config_t config = { 0 };
LPSPI_MasterGetDefaultConfig(&config);
@ -221,11 +233,6 @@ bool common_hal_busio_spi_configure(busio_spi_obj_t *self,
LPSPI_Deinit(self->spi);
LPSPI_MasterInit(self->spi, &config, LPSPI_MASTER_CLK_FREQ);
LPSPI_Enable(self->spi, false);
uint32_t tcrPrescaleValue;
self->baudrate = LPSPI_MasterSetBaudRate(self->spi, config.baudRate, LPSPI_MASTER_CLK_FREQ, &tcrPrescaleValue);
LPSPI_Enable(self->spi, true);
return true;
}