Merge pull request #2459 from hierophect/stm32-spi-oneline
STM32: Allow simplex SPI
This commit is contained in:
Jeff Epler
GitHub
commit
d7c6d9cabd
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@ -36,6 +36,9 @@
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#include "supervisor/shared/translate.h"
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#include "common-hal/microcontroller/Pin.h"
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// Note that any bugs introduced in this file can cause crashes at startup
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// for chips using external SPI flash.
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#define MAX_SPI 6 //TODO; replace this as part of periph cleanup
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#define ALL_CLOCKS 0xFF
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@ -49,10 +52,10 @@ STATIC void spi_clock_disable(uint8_t mask);
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STATIC uint32_t get_busclock(SPI_TypeDef * instance) {
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//SPI2 and 3 are on PCLK1, if they exist.
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#ifdef SPI2
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if(instance == SPI2) return HAL_RCC_GetPCLK1Freq();
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if (instance == SPI2) return HAL_RCC_GetPCLK1Freq();
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#endif
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#ifdef SPI3
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if(instance == SPI3) return HAL_RCC_GetPCLK1Freq();
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if (instance == SPI3) return HAL_RCC_GetPCLK1Freq();
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#endif
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return HAL_RCC_GetPCLK2Freq();
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}
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@ -79,38 +82,80 @@ void common_hal_busio_spi_construct(busio_spi_obj_t *self,
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uint8_t sck_len = sizeof(mcu_spi_sck_list)/sizeof(*mcu_spi_sck_list);
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uint8_t mosi_len = sizeof(mcu_spi_mosi_list)/sizeof(*mcu_spi_mosi_list);
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uint8_t miso_len = sizeof(mcu_spi_miso_list)/sizeof(*mcu_spi_miso_list);
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bool spi_taken = false;
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//sck
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for(uint i=0; i<sck_len;i++) {
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//SCK is not optional. MOSI and MISO are
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for (uint i=0; i<sck_len;i++) {
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if (mcu_spi_sck_list[i].pin == sck) {
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//mosi
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for(uint j=0; j<mosi_len;j++) {
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if (mcu_spi_mosi_list[j].pin == mosi) {
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//miso
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for(uint k=0; k<miso_len;k++) {
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if ((mcu_spi_miso_list[k].pin == miso) //everything needs the same index
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&& (mcu_spi_sck_list[i].spi_index == mcu_spi_mosi_list[j].spi_index)
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&& (mcu_spi_sck_list[i].spi_index == mcu_spi_miso_list[k].spi_index)) {
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//keep looking if the SPI is taken, edge case
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if(reserved_spi[mcu_spi_sck_list[i].spi_index-1]) {
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spi_taken = true;
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continue;
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//if both MOSI and MISO exist, loop search normally
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if ((mosi != mp_const_none) && (miso != mp_const_none)) {
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//MOSI
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for (uint j=0; j<mosi_len;j++) {
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if (mcu_spi_mosi_list[j].pin == mosi) {
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//MISO
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for (uint k=0; k<miso_len;k++) {
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if ((mcu_spi_miso_list[k].pin == miso) //everything needs the same index
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&& (mcu_spi_sck_list[i].spi_index == mcu_spi_mosi_list[j].spi_index)
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&& (mcu_spi_sck_list[i].spi_index == mcu_spi_miso_list[k].spi_index)) {
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//keep looking if the SPI is taken, edge case
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if (reserved_spi[mcu_spi_sck_list[i].spi_index-1]) {
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spi_taken = true;
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continue;
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}
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//store pins if not
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self->sck = &mcu_spi_sck_list[i];
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self->mosi = &mcu_spi_mosi_list[j];
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self->miso = &mcu_spi_miso_list[k];
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break;
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}
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//store pins if not
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self->sck = &mcu_spi_sck_list[i];
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self->mosi = &mcu_spi_mosi_list[j];
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self->miso = &mcu_spi_miso_list[k];
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break;
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}
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}
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}
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}
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}
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// if just MISO, reduce search
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} else if (miso != mp_const_none) {
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for (uint j=0; j<miso_len;j++) {
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if ((mcu_spi_miso_list[j].pin == miso) //only SCK and MISO need the same index
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&& (mcu_spi_sck_list[i].spi_index == mcu_spi_miso_list[j].spi_index)) {
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//keep looking if the SPI is taken, edge case
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if (reserved_spi[mcu_spi_sck_list[i].spi_index-1]) {
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spi_taken = true;
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continue;
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}
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//store pins if not
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self->sck = &mcu_spi_sck_list[i];
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self->mosi = NULL;
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self->miso = &mcu_spi_miso_list[j];
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break;
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}
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}
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// if just MOSI, reduce search
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} else if (mosi != mp_const_none) {
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for (uint j=0; j<mosi_len;j++) {
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if ((mcu_spi_mosi_list[j].pin == mosi) //only SCK and MOSI need the same index
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&& (mcu_spi_sck_list[i].spi_index == mcu_spi_mosi_list[j].spi_index)) {
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//keep looking if the SPI is taken, edge case
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if (reserved_spi[mcu_spi_sck_list[i].spi_index-1]) {
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spi_taken = true;
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continue;
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}
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//store pins if not
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self->sck = &mcu_spi_sck_list[i];
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self->mosi = &mcu_spi_mosi_list[j];
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self->miso = NULL;
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break;
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}
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}
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} else {
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//throw an error immediately
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mp_raise_ValueError(translate("Must provide MISO or MOSI pin"));
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}
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}
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}
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//handle typedef selection, errors
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if(self->sck!=NULL && self->mosi!=NULL && self->miso!=NULL ) {
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if ( (self->sck!=NULL && self->mosi!=NULL && self->miso != NULL) ||
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(self->sck!=NULL && self->mosi!=NULL && miso == mp_const_none) ||
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(self->sck!=NULL && self->miso!=NULL && mosi == mp_const_none)) {
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SPIx = mcu_spi_banks[self->sck->spi_index-1];
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} else {
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if (spi_taken) {
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@ -129,26 +174,31 @@ void common_hal_busio_spi_construct(busio_spi_obj_t *self,
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GPIO_InitStruct.Alternate = self->sck->altfn_index;
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HAL_GPIO_Init(pin_port(sck->port), &GPIO_InitStruct);
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GPIO_InitStruct.Pin = pin_mask(mosi->number);
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GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
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GPIO_InitStruct.Pull = GPIO_NOPULL;
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GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
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GPIO_InitStruct.Alternate = self->mosi->altfn_index;
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HAL_GPIO_Init(pin_port(mosi->port), &GPIO_InitStruct);
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if (self->mosi != NULL) {
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GPIO_InitStruct.Pin = pin_mask(mosi->number);
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GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
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GPIO_InitStruct.Pull = GPIO_NOPULL;
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GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
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GPIO_InitStruct.Alternate = self->mosi->altfn_index;
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HAL_GPIO_Init(pin_port(mosi->port), &GPIO_InitStruct);
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}
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GPIO_InitStruct.Pin = pin_mask(miso->number);
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GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
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GPIO_InitStruct.Pull = GPIO_NOPULL;
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GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
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GPIO_InitStruct.Alternate = self->miso->altfn_index;
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HAL_GPIO_Init(pin_port(miso->port), &GPIO_InitStruct);
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if (self->miso != NULL) {
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GPIO_InitStruct.Pin = pin_mask(miso->number);
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GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
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GPIO_InitStruct.Pull = GPIO_NOPULL;
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GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
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GPIO_InitStruct.Alternate = self->miso->altfn_index;
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HAL_GPIO_Init(pin_port(miso->port), &GPIO_InitStruct);
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}
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spi_clock_enable(1<<(self->sck->spi_index - 1));
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reserved_spi[self->sck->spi_index - 1] = true;
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self->handle.Instance = SPIx;
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self->handle.Init.Mode = SPI_MODE_MASTER;
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self->handle.Init.Direction = SPI_DIRECTION_2LINES;
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// Direction change only required for RX-only, see RefMan RM0090:884
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self->handle.Init.Direction = (self->mosi == NULL) ? SPI_CR1_RXONLY : SPI_DIRECTION_2LINES;
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self->handle.Init.DataSize = SPI_DATASIZE_8BIT;
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self->handle.Init.CLKPolarity = SPI_POLARITY_LOW;
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self->handle.Init.CLKPhase = SPI_PHASE_1EDGE;
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@ -169,17 +219,25 @@ void common_hal_busio_spi_construct(busio_spi_obj_t *self,
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self->bits = 8;
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claim_pin(sck);
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claim_pin(mosi);
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claim_pin(miso);
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if (self->mosi != NULL) {
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claim_pin(mosi);
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}
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if (self->miso != NULL) {
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claim_pin(miso);
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}
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}
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void common_hal_busio_spi_never_reset(busio_spi_obj_t *self) {
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for(size_t i = 0 ; i < MP_ARRAY_SIZE(mcu_spi_banks); i++) {
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for (size_t i = 0 ; i < MP_ARRAY_SIZE(mcu_spi_banks); i++) {
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if (mcu_spi_banks[i] == self->handle.Instance) {
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never_reset_spi[i] = true;
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never_reset_pin_number(self->sck->pin->port, self->sck->pin->number);
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never_reset_pin_number(self->mosi->pin->port, self->mosi->pin->number);
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never_reset_pin_number(self->miso->pin->port, self->miso->pin->number);
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if (self->mosi != NULL) {
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never_reset_pin_number(self->mosi->pin->port, self->mosi->pin->number);
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}
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if (self->miso != NULL) {
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never_reset_pin_number(self->miso->pin->port, self->miso->pin->number);
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}
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break;
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}
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}
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@ -195,8 +253,12 @@ void common_hal_busio_spi_deinit(busio_spi_obj_t *self) {
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never_reset_spi[self->sck->spi_index - 1] = false;
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reset_pin_number(self->sck->pin->port,self->sck->pin->number);
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reset_pin_number(self->mosi->pin->port,self->mosi->pin->number);
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reset_pin_number(self->miso->pin->port,self->miso->pin->number);
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if (self->mosi != NULL) {
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reset_pin_number(self->mosi->pin->port,self->mosi->pin->number);
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}
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if (self->miso != NULL) {
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reset_pin_number(self->miso->pin->port,self->miso->pin->number);
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}
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self->sck = mp_const_none;
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self->mosi = mp_const_none;
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self->miso = mp_const_none;
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@ -232,7 +294,9 @@ bool common_hal_busio_spi_configure(busio_spi_obj_t *self,
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uint32_t baudrate, uint8_t polarity, uint8_t phase, uint8_t bits) {
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//This resets the SPI, so check before updating it redundantly
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if (baudrate == self->baudrate && polarity== self->polarity
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&& phase == self->phase && bits == self->bits) return true;
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&& phase == self->phase && bits == self->bits) {
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return true;
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}
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//Deinit SPI
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HAL_SPI_DeInit(&self->handle);
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@ -243,13 +307,6 @@ bool common_hal_busio_spi_configure(busio_spi_obj_t *self,
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self->handle.Init.BaudRatePrescaler = stm32_baud_to_spi_div(baudrate, &self->prescaler,
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get_busclock(self->handle.Instance));
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self->handle.Init.Mode = SPI_MODE_MASTER;
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self->handle.Init.Direction = SPI_DIRECTION_2LINES;
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self->handle.Init.NSS = SPI_NSS_SOFT;
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self->handle.Init.FirstBit = SPI_FIRSTBIT_MSB;
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self->handle.Init.TIMode = SPI_TIMODE_DISABLE;
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self->handle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
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self->handle.Init.CRCPolynomial = 10;
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if (HAL_SPI_Init(&self->handle) != HAL_OK)
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{
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@ -292,18 +349,27 @@ void common_hal_busio_spi_unlock(busio_spi_obj_t *self) {
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bool common_hal_busio_spi_write(busio_spi_obj_t *self,
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const uint8_t *data, size_t len) {
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if (self->mosi == NULL) {
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mp_raise_ValueError(translate("No MOSI Pin"));
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}
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HAL_StatusTypeDef result = HAL_SPI_Transmit (&self->handle, (uint8_t *)data, (uint16_t)len, HAL_MAX_DELAY);
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return result == HAL_OK;
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}
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bool common_hal_busio_spi_read(busio_spi_obj_t *self,
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uint8_t *data, size_t len, uint8_t write_value) {
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if (self->miso == NULL) {
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mp_raise_ValueError(translate("No MISO Pin"));
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}
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HAL_StatusTypeDef result = HAL_SPI_Receive (&self->handle, data, (uint16_t)len, HAL_MAX_DELAY);
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return result == HAL_OK;
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}
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bool common_hal_busio_spi_transfer(busio_spi_obj_t *self,
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uint8_t *data_out, uint8_t *data_in, size_t len) {
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if (self->miso == NULL || self->mosi == NULL) {
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mp_raise_ValueError(translate("Missing MISO or MOSI Pin"));
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}
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HAL_StatusTypeDef result = HAL_SPI_TransmitReceive (&self->handle,
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data_out, data_in, (uint16_t)len,HAL_MAX_DELAY);
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return result == HAL_OK;
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