mbed library sources
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targets/hal/TARGET_NORDIC/TARGET_NRF51822/spi_api.c
- Committer:
- mbed_official
- Date:
- 2014-07-08
- Revision:
- 250:a49055e7a707
- Parent:
- 227:7bd0639b8911
- Child:
- 251:de9a1e4ffd79
File content as of revision 250:a49055e7a707:
/* mbed Microcontroller Library * Copyright (c) 2013 Nordic Semiconductor * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ //#include <math.h> #include "mbed_assert.h" #include "spi_api.h" #include "cmsis.h" #include "pinmap.h" #include "mbed_error.h" static const PinMap PinMap_SPI_SCLK[] = { {SPI_PSELSCK0 , SPI_0, 0x01}, {SPI_PSELSCK1, SPI_1, 0x02}, {SPIS_PSELSCK, SPIS, 0x03}, {NC , NC , 0} }; static const PinMap PinMap_SPI_MOSI[] = { {SPI_PSELMOSI0 , SPI_0, 0x01}, {SPI_PSELMOSI1, SPI_1, 0x02}, {SPIS_PSELMOSI, SPIS, 0x03}, {NC , NC , 0} }; static const PinMap PinMap_SPI_MISO[] = { {SPI_PSELMISO0 , SPI_0, 0x01}, {SPI_PSELMISO1, SPI_1, 0x02}, {SPIS_PSELMISO, SPIS, 0x03}, {NC , NC , 0} }; static const PinMap PinMap_SPI_SSEL[] = { {SPIS_PSELSS, SPIS, 0x03}, {NC , NC , 0} }; // {SPI_PSELSS0 , SPI_0, 0x01}, #define SPIS_MESSAGE_SIZE 1 volatile uint8_t m_tx_buf[SPIS_MESSAGE_SIZE] = {0}; volatile uint8_t m_rx_buf[SPIS_MESSAGE_SIZE] = {0}; void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) { // determine the SPI to use SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI); SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO); SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK); SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL); SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso); SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel); SPIName spi = (SPIName)pinmap_merge(spi_data, spi_cntl); //SPIName if(ssel==NC){ obj->spi = (NRF_SPI_Type*)spi; obj->spis = (NRF_SPIS_Type*)NC; } else{ obj->spi = (NRF_SPI_Type*)NC; obj->spis = (NRF_SPIS_Type*)spi; } MBED_ASSERT((int)obj->spi != NC && (int)obj->spis != NC); // pin out the spi pins if (ssel != NC) {//slave obj->spis->POWER=0; obj->spis->POWER=1; NRF_GPIO->PIN_CNF[mosi] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos) | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos); NRF_GPIO->PIN_CNF[miso] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos) | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos); NRF_GPIO->PIN_CNF[sclk] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos) | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos); NRF_GPIO->PIN_CNF[ssel] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos) | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos); obj->spis->PSELMOSI = mosi; obj->spis->PSELMISO = miso; obj->spis->PSELSCK = sclk; obj->spis->PSELCSN = ssel; obj->spis->EVENTS_END=0; obj->spis->EVENTS_ACQUIRED=0; obj->spis->MAXRX=SPIS_MESSAGE_SIZE; obj->spis->MAXTX=SPIS_MESSAGE_SIZE; obj->spis->TXDPTR = (uint32_t)&m_tx_buf[0]; obj->spis->RXDPTR = (uint32_t)&m_rx_buf[0]; obj->spis->SHORTS = (SPIS_SHORTS_END_ACQUIRE_Enabled<<SPIS_SHORTS_END_ACQUIRE_Pos); spi_format(obj, 8, 0, 1); // 8 bits, mode 0, slave } else{//master obj->spi->POWER=0; obj->spi->POWER=1; //NRF_GPIO->DIR |= (1<<mosi); NRF_GPIO->PIN_CNF[mosi] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos) | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos); obj->spi->PSELMOSI = mosi; NRF_GPIO->PIN_CNF[sclk] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos) | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos); obj->spi->PSELSCK = sclk; //NRF_GPIO->DIR &= ~(1<<miso); NRF_GPIO->PIN_CNF[miso] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos) | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos); obj->spi->PSELMISO = miso; obj->spi->EVENTS_READY = 0U; spi_format(obj, 8, 0, 0); // 8 bits, mode 0, master spi_frequency(obj, 1000000); } } void spi_free(spi_t *obj) {} static inline void spi_disable(spi_t *obj, int slave) { if(slave){ obj->spis->ENABLE = (SPIS_ENABLE_ENABLE_Disabled << SPIS_ENABLE_ENABLE_Pos); } else{ obj->spi->ENABLE = (SPI_ENABLE_ENABLE_Disabled << SPI_ENABLE_ENABLE_Pos); } } static inline void spi_enable(spi_t *obj, int slave) { if(slave){ obj->spis->ENABLE = (SPIS_ENABLE_ENABLE_Enabled << SPIS_ENABLE_ENABLE_Pos); } else{ obj->spi->ENABLE = (SPI_ENABLE_ENABLE_Enabled << SPI_ENABLE_ENABLE_Pos); } } void spi_format(spi_t *obj, int bits, int mode, int slave) { uint32_t config_mode = 0; spi_disable(obj,slave); if (bits != 8) { error("Only 8bits SPI supported"); } switch (mode) { case 0: config_mode = (SPI_CONFIG_CPHA_Leading << SPI_CONFIG_CPHA_Pos) | (SPI_CONFIG_CPOL_ActiveHigh << SPI_CONFIG_CPOL_Pos); break; case 1: config_mode = (SPI_CONFIG_CPHA_Trailing << SPI_CONFIG_CPHA_Pos) | (SPI_CONFIG_CPOL_ActiveHigh << SPI_CONFIG_CPOL_Pos); break; case 2: config_mode = (SPI_CONFIG_CPHA_Leading << SPI_CONFIG_CPHA_Pos) | (SPI_CONFIG_CPOL_ActiveLow << SPI_CONFIG_CPOL_Pos); break; case 3: config_mode = (SPI_CONFIG_CPHA_Trailing << SPI_CONFIG_CPHA_Pos) | (SPI_CONFIG_CPOL_ActiveLow << SPI_CONFIG_CPOL_Pos); break; default: error("SPI format error"); break; } //default to msb first if(slave){ obj->spis->CONFIG = (config_mode | (SPI_CONFIG_ORDER_MsbFirst << SPI_CONFIG_ORDER_Pos) ); } else{ obj->spi->CONFIG = (config_mode | (SPI_CONFIG_ORDER_MsbFirst << SPI_CONFIG_ORDER_Pos) ); } spi_enable(obj,slave); } void spi_frequency(spi_t *obj, int hz) { if((int)obj->spi==NC) return; spi_disable(obj,0); if(hz<250000) { //125Kbps obj->spi->FREQUENCY = (uint32_t) SPI_FREQUENCY_FREQUENCY_K125; } else if(hz<500000){//250Kbps obj->spi->FREQUENCY = (uint32_t) SPI_FREQUENCY_FREQUENCY_K250; } else if(hz<1000000){//500Kbps obj->spi->FREQUENCY = (uint32_t) SPI_FREQUENCY_FREQUENCY_K500; } else if(hz<2000000){//1Mbps obj->spi->FREQUENCY = (uint32_t) SPI_FREQUENCY_FREQUENCY_M1; } else if(hz<4000000){//2Mbps obj->spi->FREQUENCY = (uint32_t) SPI_FREQUENCY_FREQUENCY_M2; } else if(hz<8000000){//4Mbps obj->spi->FREQUENCY = (uint32_t) SPI_FREQUENCY_FREQUENCY_M4; } else{//8Mbps obj->spi->FREQUENCY = (uint32_t) SPI_FREQUENCY_FREQUENCY_M8; } spi_enable(obj,0); } static inline int spi_readable(spi_t *obj) { return (obj->spi->EVENTS_READY == 1); } static inline int spi_writeable(spi_t *obj) { return (obj->spi->EVENTS_READY == 0); } static inline int spi_read(spi_t *obj) { while (!spi_readable(obj)){ } obj->spi->EVENTS_READY =0; return (int)obj->spi->RXD; } int spi_master_write(spi_t *obj, int value) { while (!spi_writeable(obj)){ } obj->spi->TXD = (uint32_t)value; return spi_read(obj); } //static inline int spis_writeable(spi_t *obj) { // return (obj->spis->EVENTS_ACQUIRED==1); //} int spi_slave_receive(spi_t *obj) { return obj->spis->EVENTS_END; }; int spi_slave_read(spi_t *obj) { return m_rx_buf[0]; } void spi_slave_write(spi_t *obj, int value) { m_tx_buf[0]= value & 0xFF; obj->spis->TASKS_RELEASE=1; obj->spis->EVENTS_ACQUIRED=0; obj->spis->EVENTS_END=0; }