124 lines
4.7 KiB
C
124 lines
4.7 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016 Glenn Ruben Bakke
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include "mphalport.h"
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#include "hal_spi.h"
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#ifdef HAL_SPIE_MODULE_ENABLED
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static const uint32_t hal_spi_frequency_lookup[] = {
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SPIM_FREQUENCY_FREQUENCY_K125, // 125 kbps
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SPIM_FREQUENCY_FREQUENCY_K250, // 250 kbps
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SPIM_FREQUENCY_FREQUENCY_K500, // 500 kbps
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SPIM_FREQUENCY_FREQUENCY_M1, // 1 Mbps
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SPIM_FREQUENCY_FREQUENCY_M2, // 2 Mbps
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SPIM_FREQUENCY_FREQUENCY_M4, // 4 Mbps
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SPIM_FREQUENCY_FREQUENCY_M8, // 8 Mbps
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#if NRF52840_XXAA
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SPIM_FREQUENCY_FREQUENCY_M16, // 16 Mbps
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SPIM_FREQUENCY_FREQUENCY_M32, // 32 Mbps
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#endif
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};
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void hal_spi_master_init(NRF_SPI_Type * p_instance, hal_spi_init_t const * p_spi_init) {
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// cast to master type
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NRF_SPIM_Type * spim_instance = (NRF_SPIM_Type *)p_instance;
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hal_gpio_cfg_pin(p_spi_init->clk_pin->port, p_spi_init->clk_pin->pin, HAL_GPIO_MODE_OUTPUT, HAL_GPIO_PULL_DISABLED);
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hal_gpio_cfg_pin(p_spi_init->mosi_pin->port, p_spi_init->mosi_pin->pin, HAL_GPIO_MODE_OUTPUT, HAL_GPIO_PULL_DISABLED);
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hal_gpio_cfg_pin(p_spi_init->miso_pin->port, p_spi_init->miso_pin->pin, HAL_GPIO_MODE_INPUT, HAL_GPIO_PULL_DISABLED);
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spim_instance->PSEL.SCK = p_spi_init->clk_pin->pin;
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spim_instance->PSEL.MOSI = p_spi_init->mosi_pin->pin;
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spim_instance->PSEL.MISO = p_spi_init->miso_pin->pin;
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#if NRF52840_XXAA
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spim_instance->PSEL.SCK |= (p_spi_init->clk_pin->port << SPIM_PSEL_SCK_PORT_Pos);
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spim_instance->PSEL.MOSI |= (p_spi_init->mosi_pin->port << SPIM_PSEL_MOSI_PORT_Pos);
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spim_instance->PSEL.MISO |= (p_spi_init->miso_pin->port << SPIM_PSEL_MISO_PORT_Pos);
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#endif
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spim_instance->FREQUENCY = hal_spi_frequency_lookup[p_spi_init->freq];
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uint32_t mode;
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switch (p_spi_init->mode) {
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case HAL_SPI_MODE_CPOL0_CPHA0:
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mode = (SPIM_CONFIG_CPHA_Leading << SPIM_CONFIG_CPHA_Pos) | (SPIM_CONFIG_CPOL_ActiveHigh << SPIM_CONFIG_CPOL_Pos);
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break;
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case HAL_SPI_MODE_CPOL0_CPHA1:
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mode = (SPIM_CONFIG_CPHA_Trailing << SPIM_CONFIG_CPHA_Pos) | (SPIM_CONFIG_CPOL_ActiveHigh << SPIM_CONFIG_CPOL_Pos);
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break;
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case HAL_SPI_MODE_CPOL1_CPHA0:
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mode = (SPIM_CONFIG_CPHA_Leading << SPIM_CONFIG_CPHA_Pos) | (SPIM_CONFIG_CPOL_ActiveLow << SPIM_CONFIG_CPOL_Pos);
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break;
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case HAL_SPI_MODE_CPOL1_CPHA1:
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mode = (SPIM_CONFIG_CPHA_Trailing << SPIM_CONFIG_CPHA_Pos) | (SPIM_CONFIG_CPOL_ActiveLow << SPIM_CONFIG_CPOL_Pos);
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break;
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default:
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mode = 0;
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break;
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}
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if (p_spi_init->firstbit == HAL_SPI_LSB_FIRST) {
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spim_instance->CONFIG = (mode | (SPIM_CONFIG_ORDER_LsbFirst << SPIM_CONFIG_ORDER_Pos));
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} else {
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spim_instance->CONFIG = (mode | (SPIM_CONFIG_ORDER_MsbFirst << SPIM_CONFIG_ORDER_Pos));
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}
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spim_instance->EVENTS_END = 0;
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spim_instance->ENABLE = (SPIM_ENABLE_ENABLE_Enabled << SPIM_ENABLE_ENABLE_Pos);
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}
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void hal_spi_master_tx_rx(NRF_SPI_Type * p_instance, uint16_t transfer_size, const uint8_t * tx_data, uint8_t * rx_data) {
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// cast to master type
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NRF_SPIM_Type * spim_instance = (NRF_SPIM_Type *)p_instance;
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if (tx_data != NULL) {
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spim_instance->TXD.PTR = (uint32_t)(tx_data);
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spim_instance->TXD.MAXCNT = transfer_size;
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}
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if (rx_data != NULL) {
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spim_instance->RXD.PTR = (uint32_t)(rx_data);
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spim_instance->RXD.MAXCNT = transfer_size;
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}
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spim_instance->TASKS_START = 1;
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while(spim_instance->EVENTS_END != 1) {
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;
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}
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spim_instance->EVENTS_END = 0;
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spim_instance->TASKS_STOP = 1;
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}
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#endif // HAL_SPIE_MODULE_ENABLED
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