spi_set_format does not update the clock polarity until after a read or write #868
Description
Corrected code in spi.h
static inline void spi_set_format(spi_inst_t *spi, uint data_bits, spi_cpol_t cpol, spi_cpha_t cpha, __unused spi_order_t order) {
invalid_params_if(SPI, data_bits < 4 || data_bits > 16);
// LSB-first not supported on PL022:
invalid_params_if(SPI, order != SPI_MSB_FIRST);
invalid_params_if(SPI, cpol != SPI_CPOL_0 && cpol != SPI_CPOL_1);
invalid_params_if(SPI, cpha != SPI_CPHA_0 && cpha != SPI_CPHA_1);
hw_write_masked(&spi_get_hw(spi)->cr0,
((uint)(data_bits - 1)) << SPI_SSPCR0_DSS_LSB |
((uint)cpol) << SPI_SSPCR0_SPO_LSB |
((uint)cpha) << SPI_SSPCR0_SPH_LSB,
SPI_SSPCR0_DSS_BITS |
SPI_SSPCR0_SPO_BITS |
SPI_SSPCR0_SPH_BITS);
//New code added
hw_clear_bits(&spi_get_hw(spi)->cr1, SPI_SSPCR1_SSE_BITS); //disable the SPI
hw_set_bits(&spi_get_hw(spi)->cr1, SPI_SSPCR1_SSE_BITS); //re-enable the SPI
}