diff --git a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/spi_api.c b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/spi_api.c index 728583e6ea..f2fae81534 100644 --- a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/spi_api.c +++ b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/spi_api.c @@ -28,6 +28,7 @@ ******************************************************************************* */ #include "mbed_assert.h" +#include "mbed_error.h" #include "spi_api.h" #if DEVICE_SPI @@ -227,232 +228,58 @@ void spi_format(spi_t *obj, int bits, int mode, int slave) init_spi(obj); } +static const uint16_t baudrate_prescaler_table[] = {SPI_BAUDRATEPRESCALER_2, + SPI_BAUDRATEPRESCALER_4, + SPI_BAUDRATEPRESCALER_8, + SPI_BAUDRATEPRESCALER_16, + SPI_BAUDRATEPRESCALER_32, + SPI_BAUDRATEPRESCALER_64, + SPI_BAUDRATEPRESCALER_128, + SPI_BAUDRATEPRESCALER_256}; + void spi_frequency(spi_t *obj, int hz) { -#if defined(TARGET_STM32F401RE) || defined(TARGET_STM32F401VC) || defined(TARGET_STM32F407VG) - // Note: The frequencies are obtained with SPI1 clock = 84 MHz (APB2 clock) - if (hz < 600000) { - obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 330 kHz - } else if ((hz >= 600000) && (hz < 1000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 656 kHz - } else if ((hz >= 1000000) && (hz < 2000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1.3 MHz - } else if ((hz >= 2000000) && (hz < 5000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 2.6 MHz - } else if ((hz >= 5000000) && (hz < 10000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 5.25 MHz - } else if ((hz >= 10000000) && (hz < 21000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 10.5 MHz - } else if ((hz >= 21000000) && (hz < 42000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 21 MHz - } else { // >= 42000000 - obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 42 MHz - } -#elif defined(TARGET_STM32F405RG) - // Note: The frequencies are obtained with SPI1 clock = 48 MHz (APB2 clock) - if (obj->spi == SPI_1) { - if (hz < 375000) { - obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 187.5 kHz - } else if ((hz >= 375000) && (hz < 750000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 375 kHz - } else if ((hz >= 750000) && (hz < 1500000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 0.75 MHz - } else if ((hz >= 1500000) && (hz < 3000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.5 MHz - } else if ((hz >= 3000000) && (hz < 6000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3 MHz - } else if ((hz >= 6000000) && (hz < 12000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6 MHz - } else if ((hz >= 12000000) && (hz < 24000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12 MHz - } else { // >= 24000000 - obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 24 MHz - } - // Note: The frequencies are obtained with SPI2/3 clock = 48 MHz (APB1 clock) - } else if ((obj->spi == SPI_2) || (obj->spi == SPI_3)) { - if (hz < 375000) { - obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 187.5 kHz - } else if ((hz >= 375000) && (hz < 750000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 375 kHz - } else if ((hz >= 750000) && (hz < 1500000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 0.75 MHz - } else if ((hz >= 1500000) && (hz < 3000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.5 MHz - } else if ((hz >= 3000000) && (hz < 6000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3 MHz - } else if ((hz >= 6000000) && (hz < 12000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6 MHz - } else if ((hz >= 12000000) && (hz < 24000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12 MHz - } else { // >= 24000000 - obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 24 MHz - } - } -#elif defined(TARGET_STM32F411RE) || defined(TARGET_STM32F429ZI) - // Values depend of PCLK2: 100 MHz - if ((obj->spi == SPI_1) || (obj->spi == SPI_4) || (obj->spi == SPI_5)) { - if (hz < 700000) { - obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 391 kHz - } else if ((hz >= 700000) && (hz < 1000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 781 kHz - } else if ((hz >= 1000000) && (hz < 3000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1.56 MHz - } else if ((hz >= 3000000) && (hz < 6000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 3.13 MHz - } else if ((hz >= 6000000) && (hz < 12000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 6.25 MHz - } else if ((hz >= 12000000) && (hz < 25000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 12.5 MHz - } else if ((hz >= 25000000) && (hz < 50000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 25 MHz - } else { // >= 50000000 - obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 50 MHz - } - } - // Values depend of PCLK1: 50 MHz - if ((obj->spi == SPI_2) || (obj->spi == SPI_3)) { - if (hz < 400000) { - obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 195 kHz - } else if ((hz >= 400000) && (hz < 700000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 391 kHz - } else if ((hz >= 700000) && (hz < 1000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 781 MHz - } else if ((hz >= 1000000) && (hz < 3000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.56 MHz - } else if ((hz >= 3000000) && (hz < 6000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3.13 MHz - } else if ((hz >= 6000000) && (hz < 12000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6.25 MHz - } else if ((hz >= 12000000) && (hz < 25000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12.5 MHz - } else { // >= 25000000 - obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 25 MHz - } - } -#elif defined(TARGET_STM32F446RE) - // Values depend of PCLK2: 90 MHz - if ((obj->spi == SPI_1) || (obj->spi == SPI_4)) { - if (hz < 700000) { - obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 352 kHz - } else if ((hz >= 700000) && (hz < 1000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 703 kHz - } else if ((hz >= 1000000) && (hz < 3000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1.41 MHz - } else if ((hz >= 3000000) && (hz < 5000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 2.81 MHz - } else if ((hz >= 5000000) && (hz < 11000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 5.63 MHz - } else if ((hz >= 11000000) && (hz < 22000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 11.25 MHz - } else if ((hz >= 22000000) && (hz < 45000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 22.5 MHz - } else { // >= 45000000 - obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 45 MHz - } - } - // Values depend of PCLK1: 45 MHz - if ((obj->spi == SPI_2) || (obj->spi == SPI_3)) { - if (hz < 350000) { - obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 176 kHz - } else if ((hz >= 350000) && (hz < 700000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 352 kHz - } else if ((hz >= 700000) && (hz < 1000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 703 kHz - } else if ((hz >= 1000000) && (hz < 3000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.41 MHz - } else if ((hz >= 3000000) && (hz < 5000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 2.81 MHz - } else if ((hz >= 5000000) && (hz < 11000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 5.63 MHz - } else if ((hz >= 11000000) && (hz < 22000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 11.25 MHz - } else { // >= 22000000 - obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 22.5 MHz - } - } -#elif defined(TARGET_STM32F469NI) - // Values depend of PCLK2: 84 MHz - if ((obj->spi == SPI_1) || (obj->spi == SPI_4)) { - if (hz < 600000) { - obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 328 kHz - } else if ((hz >= 600000) && (hz < 1000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 656 kHz - } else if ((hz >= 1000000) && (hz < 2000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1.31 MHz - } else if ((hz >= 2000000) && (hz < 5000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 2.63 MHz - } else if ((hz >= 5000000) && (hz < 10000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 5.25 MHz - } else if ((hz >= 10000000) && (hz < 20000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 10.5 MHz - } else if ((hz >= 20000000) && (hz < 40000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 21 MHz - } else { // >= 40000000 - obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 42 MHz - } - } - // Values depend of PCLK1: 42 MHz - if ((obj->spi == SPI_2) || (obj->spi == SPI_3)) { - if (hz < 300000) { - obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 164 kHz - } else if ((hz >= 300000) && (hz < 600000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 328 kHz - } else if ((hz >= 600000) && (hz < 1000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 656 kHz - } else if ((hz >= 1000000) && (hz < 2000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.31 MHz - } else if ((hz >= 2000000) && (hz < 5000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 2.63 MHz - } else if ((hz >= 5000000) && (hz < 10000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 5.25 MHz - } else if ((hz >= 10000000) && (hz < 20000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 10.5 MHz - } else { // >= 20000000 - obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 21 MHz - } - } -#elif defined(TARGET_STM32F410RB) - // Values depend of PCLK2: 100 MHz - if ((obj->spi == SPI_1) || (obj->spi == SPI_5)) { - if (hz < 700000) { - obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 391 kHz - } else if ((hz >= 700000) && (hz < 1000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 781 kHz - } else if ((hz >= 1000000) && (hz < 3000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1.56 MHz - } else if ((hz >= 3000000) && (hz < 6000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 3.13 MHz - } else if ((hz >= 6000000) && (hz < 12000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 6.25 MHz - } else if ((hz >= 12000000) && (hz < 25000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 12.5 MHz - } else if ((hz >= 25000000) && (hz < 50000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 25 MHz - } else { // >= 50000000 - obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 50 MHz - } - } - // Values depend of PCLK1: 50 MHz - if (obj->spi == SPI_2) { - if (hz < 400000) { - obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 195 kHz - } else if ((hz >= 400000) && (hz < 700000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 391 kHz - } else if ((hz >= 700000) && (hz < 1000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 781 MHz - } else if ((hz >= 1000000) && (hz < 3000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.56 MHz - } else if ((hz >= 3000000) && (hz < 6000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3.13 MHz - } else if ((hz >= 6000000) && (hz < 12000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6.25 MHz - } else if ((hz >= 12000000) && (hz < 25000000)) { - obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12.5 MHz - } else { // >= 25000000 - obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 25 MHz - } - } + int spi_hz = 0; + uint8_t prescaler_rank = 0; + + /* Get source clock depending on SPI instance */ + switch ((int)obj->spi) { + case SPI_1: +#if defined SPI4_BASE + case SPI_4: #endif +#if defined SPI5_BASE + case SPI_5: +#endif +#if defined SPI6_BASE + case SPI_6: +#endif + /* SPI_1, SPI_4, SPI_5 and SPI_6. Source CLK is PCKL2 */ + spi_hz = HAL_RCC_GetPCLK2Freq(); + break; + case SPI_2: +#if defined SPI3_BASE + case SPI_3: +#endif + /* SPI_2 and SPI_3. Source CLK is PCKL1 */ + spi_hz = HAL_RCC_GetPCLK1Freq(); + break; + default: + error("SPI instance not set"); + } + + /* Define pre-scaler in order to get highest available frequency below requested frequency */ + while ((spi_hz > hz) && (prescaler_rank < sizeof(baudrate_prescaler_table)/sizeof(baudrate_prescaler_table[0]))){ + spi_hz = spi_hz / 2; + prescaler_rank++; + } + + if (prescaler_rank <= sizeof(baudrate_prescaler_table)/sizeof(baudrate_prescaler_table[0])) { + obj->br_presc = baudrate_prescaler_table[prescaler_rank-1]; + } else { + error("Couldn't setup requested SPI frequency"); + } + init_spi(obj); }