mirror of https://github.com/ARMmbed/mbed-os.git
[STM32F4xx] Change SPI clock selection
Update of STM32F4 family CPI clock selection algo. Maximum SPI clock is obtained from APB domain clock (based on HAL API). Then algo sets maximum frequency available below requested frequencypull/2013/head
Erwan GOURIOU
parent
703aee4f61
commit
b574bb5048
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@ -28,6 +28,7 @@
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*******************************************************************************
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*******************************************************************************
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*/
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*/
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#include "mbed_assert.h"
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#include "mbed_assert.h"
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#include "mbed_error.h"
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#include "spi_api.h"
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#include "spi_api.h"
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#if DEVICE_SPI
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#if DEVICE_SPI
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@ -227,232 +228,58 @@ void spi_format(spi_t *obj, int bits, int mode, int slave)
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init_spi(obj);
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init_spi(obj);
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}
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}
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static const uint16_t baudrate_prescaler_table[] = {SPI_BAUDRATEPRESCALER_2,
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SPI_BAUDRATEPRESCALER_4,
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SPI_BAUDRATEPRESCALER_8,
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SPI_BAUDRATEPRESCALER_16,
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SPI_BAUDRATEPRESCALER_32,
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SPI_BAUDRATEPRESCALER_64,
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SPI_BAUDRATEPRESCALER_128,
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SPI_BAUDRATEPRESCALER_256};
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void spi_frequency(spi_t *obj, int hz)
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void spi_frequency(spi_t *obj, int hz)
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{
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{
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#if defined(TARGET_STM32F401RE) || defined(TARGET_STM32F401VC) || defined(TARGET_STM32F407VG)
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int spi_hz = 0;
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// Note: The frequencies are obtained with SPI1 clock = 84 MHz (APB2 clock)
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uint8_t prescaler_rank = 0;
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if (hz < 600000) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 330 kHz
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/* Get source clock depending on SPI instance */
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} else if ((hz >= 600000) && (hz < 1000000)) {
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switch ((int)obj->spi) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 656 kHz
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case SPI_1:
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} else if ((hz >= 1000000) && (hz < 2000000)) {
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#if defined SPI4_BASE
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obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1.3 MHz
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case SPI_4:
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} else if ((hz >= 2000000) && (hz < 5000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 2.6 MHz
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} else if ((hz >= 5000000) && (hz < 10000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 5.25 MHz
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} else if ((hz >= 10000000) && (hz < 21000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 10.5 MHz
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} else if ((hz >= 21000000) && (hz < 42000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 21 MHz
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} else { // >= 42000000
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obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 42 MHz
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}
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#elif defined(TARGET_STM32F405RG)
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// Note: The frequencies are obtained with SPI1 clock = 48 MHz (APB2 clock)
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if (obj->spi == SPI_1) {
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if (hz < 375000) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 187.5 kHz
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} else if ((hz >= 375000) && (hz < 750000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 375 kHz
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} else if ((hz >= 750000) && (hz < 1500000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 0.75 MHz
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} else if ((hz >= 1500000) && (hz < 3000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.5 MHz
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} else if ((hz >= 3000000) && (hz < 6000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3 MHz
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} else if ((hz >= 6000000) && (hz < 12000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6 MHz
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} else if ((hz >= 12000000) && (hz < 24000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12 MHz
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} else { // >= 24000000
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obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 24 MHz
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}
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// Note: The frequencies are obtained with SPI2/3 clock = 48 MHz (APB1 clock)
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} else if ((obj->spi == SPI_2) || (obj->spi == SPI_3)) {
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if (hz < 375000) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 187.5 kHz
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} else if ((hz >= 375000) && (hz < 750000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 375 kHz
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} else if ((hz >= 750000) && (hz < 1500000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 0.75 MHz
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} else if ((hz >= 1500000) && (hz < 3000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.5 MHz
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} else if ((hz >= 3000000) && (hz < 6000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3 MHz
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} else if ((hz >= 6000000) && (hz < 12000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6 MHz
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} else if ((hz >= 12000000) && (hz < 24000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12 MHz
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} else { // >= 24000000
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obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 24 MHz
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}
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}
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#elif defined(TARGET_STM32F411RE) || defined(TARGET_STM32F429ZI)
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// Values depend of PCLK2: 100 MHz
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if ((obj->spi == SPI_1) || (obj->spi == SPI_4) || (obj->spi == SPI_5)) {
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if (hz < 700000) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 391 kHz
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} else if ((hz >= 700000) && (hz < 1000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 781 kHz
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} else if ((hz >= 1000000) && (hz < 3000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1.56 MHz
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} else if ((hz >= 3000000) && (hz < 6000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 3.13 MHz
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} else if ((hz >= 6000000) && (hz < 12000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 6.25 MHz
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} else if ((hz >= 12000000) && (hz < 25000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 12.5 MHz
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} else if ((hz >= 25000000) && (hz < 50000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 25 MHz
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} else { // >= 50000000
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obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 50 MHz
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}
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}
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// Values depend of PCLK1: 50 MHz
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if ((obj->spi == SPI_2) || (obj->spi == SPI_3)) {
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if (hz < 400000) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 195 kHz
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} else if ((hz >= 400000) && (hz < 700000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 391 kHz
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} else if ((hz >= 700000) && (hz < 1000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 781 MHz
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} else if ((hz >= 1000000) && (hz < 3000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.56 MHz
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} else if ((hz >= 3000000) && (hz < 6000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3.13 MHz
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} else if ((hz >= 6000000) && (hz < 12000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6.25 MHz
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} else if ((hz >= 12000000) && (hz < 25000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12.5 MHz
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} else { // >= 25000000
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obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 25 MHz
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}
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}
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#elif defined(TARGET_STM32F446RE)
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// Values depend of PCLK2: 90 MHz
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if ((obj->spi == SPI_1) || (obj->spi == SPI_4)) {
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if (hz < 700000) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 352 kHz
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} else if ((hz >= 700000) && (hz < 1000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 703 kHz
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} else if ((hz >= 1000000) && (hz < 3000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1.41 MHz
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} else if ((hz >= 3000000) && (hz < 5000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 2.81 MHz
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} else if ((hz >= 5000000) && (hz < 11000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 5.63 MHz
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} else if ((hz >= 11000000) && (hz < 22000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 11.25 MHz
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} else if ((hz >= 22000000) && (hz < 45000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 22.5 MHz
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} else { // >= 45000000
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obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 45 MHz
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}
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}
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// Values depend of PCLK1: 45 MHz
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if ((obj->spi == SPI_2) || (obj->spi == SPI_3)) {
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if (hz < 350000) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 176 kHz
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} else if ((hz >= 350000) && (hz < 700000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 352 kHz
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} else if ((hz >= 700000) && (hz < 1000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 703 kHz
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} else if ((hz >= 1000000) && (hz < 3000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.41 MHz
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} else if ((hz >= 3000000) && (hz < 5000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 2.81 MHz
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} else if ((hz >= 5000000) && (hz < 11000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 5.63 MHz
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} else if ((hz >= 11000000) && (hz < 22000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 11.25 MHz
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} else { // >= 22000000
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obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 22.5 MHz
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}
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}
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#elif defined(TARGET_STM32F469NI)
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// Values depend of PCLK2: 84 MHz
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if ((obj->spi == SPI_1) || (obj->spi == SPI_4)) {
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if (hz < 600000) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 328 kHz
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} else if ((hz >= 600000) && (hz < 1000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 656 kHz
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} else if ((hz >= 1000000) && (hz < 2000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1.31 MHz
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} else if ((hz >= 2000000) && (hz < 5000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 2.63 MHz
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} else if ((hz >= 5000000) && (hz < 10000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 5.25 MHz
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} else if ((hz >= 10000000) && (hz < 20000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 10.5 MHz
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} else if ((hz >= 20000000) && (hz < 40000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 21 MHz
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} else { // >= 40000000
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obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 42 MHz
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}
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}
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// Values depend of PCLK1: 42 MHz
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if ((obj->spi == SPI_2) || (obj->spi == SPI_3)) {
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if (hz < 300000) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 164 kHz
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} else if ((hz >= 300000) && (hz < 600000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 328 kHz
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} else if ((hz >= 600000) && (hz < 1000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 656 kHz
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} else if ((hz >= 1000000) && (hz < 2000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.31 MHz
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} else if ((hz >= 2000000) && (hz < 5000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 2.63 MHz
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} else if ((hz >= 5000000) && (hz < 10000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 5.25 MHz
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} else if ((hz >= 10000000) && (hz < 20000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 10.5 MHz
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} else { // >= 20000000
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obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 21 MHz
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}
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}
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#elif defined(TARGET_STM32F410RB)
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// Values depend of PCLK2: 100 MHz
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if ((obj->spi == SPI_1) || (obj->spi == SPI_5)) {
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if (hz < 700000) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 391 kHz
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} else if ((hz >= 700000) && (hz < 1000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 781 kHz
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} else if ((hz >= 1000000) && (hz < 3000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1.56 MHz
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} else if ((hz >= 3000000) && (hz < 6000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 3.13 MHz
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} else if ((hz >= 6000000) && (hz < 12000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 6.25 MHz
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} else if ((hz >= 12000000) && (hz < 25000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 12.5 MHz
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} else if ((hz >= 25000000) && (hz < 50000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 25 MHz
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} else { // >= 50000000
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obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 50 MHz
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}
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}
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// Values depend of PCLK1: 50 MHz
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if (obj->spi == SPI_2) {
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if (hz < 400000) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 195 kHz
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} else if ((hz >= 400000) && (hz < 700000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 391 kHz
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} else if ((hz >= 700000) && (hz < 1000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 781 MHz
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} else if ((hz >= 1000000) && (hz < 3000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.56 MHz
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} else if ((hz >= 3000000) && (hz < 6000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3.13 MHz
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} else if ((hz >= 6000000) && (hz < 12000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6.25 MHz
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} else if ((hz >= 12000000) && (hz < 25000000)) {
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obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12.5 MHz
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} else { // >= 25000000
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obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 25 MHz
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}
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}
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#endif
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#endif
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#if defined SPI5_BASE
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case SPI_5:
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#endif
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#if defined SPI6_BASE
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case SPI_6:
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#endif
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/* SPI_1, SPI_4, SPI_5 and SPI_6. Source CLK is PCKL2 */
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spi_hz = HAL_RCC_GetPCLK2Freq();
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break;
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case SPI_2:
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#if defined SPI3_BASE
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case SPI_3:
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#endif
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/* SPI_2 and SPI_3. Source CLK is PCKL1 */
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spi_hz = HAL_RCC_GetPCLK1Freq();
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break;
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default:
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error("SPI instance not set");
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}
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/* Define pre-scaler in order to get highest available frequency below requested frequency */
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while ((spi_hz > hz) && (prescaler_rank < sizeof(baudrate_prescaler_table)/sizeof(baudrate_prescaler_table[0]))){
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spi_hz = spi_hz / 2;
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prescaler_rank++;
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}
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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);
|
init_spi(obj);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue