205 lines
6.3 KiB
C
205 lines
6.3 KiB
C
/*****************************************************************************
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* | File : sysfs_software_spi.h
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* | Author : Waveshare team
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* | Function : Read and write /sys/class/gpio, software spi
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* | Info :
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*----------------
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* | This version: V1.0
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* | Date : 2019-06-05
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* | Info : Basic version
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*
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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 documnetation 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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# furished 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 OR 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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# Read_data 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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******************************************************************************/
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#include "sysfs_software_spi.h"
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SOFTWARE_SPI software_spi;
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/******************************************************************************
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function:
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parameter:
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Info:
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******************************************************************************/
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void SYSFS_software_spi_begin(void)
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{
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// gpio
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software_spi.SCLK_PIN = SPI0_SCK;
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software_spi.MOSI_PIN = SPI0_MOSI;
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software_spi.MISO_PIN = SPI0_MISO;
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//software spi configure
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software_spi.Mode = SOFTWARE_SPI_Mode0;
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software_spi.Type = SOFTWARE_SPI_Master;
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software_spi.Delay = SOFTWARE_SPI_CLOCK_DIV2;
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software_spi.Order = SOFTWARE_SPI_MSBFIRST; // MSBFIRST
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SYSFS_GPIO_Export(software_spi.SCLK_PIN);
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SYSFS_GPIO_Export(software_spi.MOSI_PIN);
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SYSFS_GPIO_Export(software_spi.MISO_PIN);
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SYSFS_GPIO_Direction(software_spi.SCLK_PIN, OUT);
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SYSFS_GPIO_Direction(software_spi.MOSI_PIN, OUT);
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SYSFS_GPIO_Direction(software_spi.MISO_PIN, IN);
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}
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void SYSFS_software_spi_end(void)
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{
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SYSFS_GPIO_Write(software_spi.SCLK_PIN, LOW);
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SYSFS_GPIO_Write(software_spi.MOSI_PIN, LOW);
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SYSFS_GPIO_Unexport(software_spi.SCLK_PIN);
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SYSFS_GPIO_Unexport(software_spi.MOSI_PIN);
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}
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void SYSFS_software_spi_setBitOrder(uint8_t order)
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{
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software_spi.Order = order & 1;
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}
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void SYSFS_software_spi_setDataMode(uint8_t mode)
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{
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if(mode > 4) {
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SYSFS_SOFTWARE_SPI_Debug("MODE must be 0-3\r\n");
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return;
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}
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software_spi.Mode = mode;
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switch (software_spi.Mode) {
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case SOFTWARE_SPI_Mode0:
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software_spi.CPOL = 0;
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software_spi.CPHA = 0;
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break;
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case SOFTWARE_SPI_Mode1:
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software_spi.CPOL = 0;
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software_spi.CPHA = 1;
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break;
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case SOFTWARE_SPI_Mode2:
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software_spi.CPOL = 1;
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software_spi.CPHA = 0;
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break;
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case SOFTWARE_SPI_Mode3:
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software_spi.CPOL = 1;
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software_spi.CPHA = 1;
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break;
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}
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}
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void SYSFS_software_spi_setClockDivider(uint8_t div)
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{
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if(div > 8) {
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SYSFS_SOFTWARE_SPI_Debug("div must be 0-7\r\n");
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return;
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}
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switch (div) {
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case SOFTWARE_SPI_CLOCK_DIV2:
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software_spi.Delay = 2;
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break;
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case SOFTWARE_SPI_CLOCK_DIV4:
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software_spi.Delay = 4;
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break;
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case SOFTWARE_SPI_CLOCK_DIV8:
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software_spi.Delay = 8;
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break;
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case SOFTWARE_SPI_CLOCK_DIV16:
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software_spi.Delay = 16;
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break;
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case SOFTWARE_SPI_CLOCK_DIV32:
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software_spi.Delay = 32;
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break;
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case SOFTWARE_SPI_CLOCK_DIV64:
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software_spi.Delay = 64;
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break;
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case SOFTWARE_SPI_CLOCK_DIV128:
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software_spi.Delay = 128;
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break;
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default:
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software_spi.Delay = 128;
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break;
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}
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}
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/******************************************************************************
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function: SPI Mode 0
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parameter:
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Info:
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******************************************************************************/
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uint8_t SYSFS_software_spi_transfer(uint8_t value)
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{
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// printf("value = %d\r\n", value);
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uint8_t Read_data;
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if (software_spi.Order == SOFTWARE_SPI_LSBFIRST) {
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uint8_t temp =
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((value & 0x01) << 7) |
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((value & 0x02) << 5) |
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((value & 0x04) << 3) |
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((value & 0x08) << 1) |
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((value & 0x10) >> 1) |
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((value & 0x20) >> 3) |
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((value & 0x40) >> 5) |
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((value & 0x80) >> 7);
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value = temp;
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}
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uint8_t delay = software_spi.Delay >> 1;
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for(int j=delay; j > 0; j--);
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// printf("value = %d\r\n", value);
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uint8_t Read_miso = 0;
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SYSFS_GPIO_Write(software_spi.SCLK_PIN, 0);
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for (uint8_t bit = 0; bit < 8; bit++) {
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SYSFS_GPIO_Write(software_spi.SCLK_PIN, 0);
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// for(int j=delay; j > 0; j--);// DELAY
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if (software_spi.CPHA) {
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Read_miso = SYSFS_GPIO_Read(software_spi.MISO_PIN);
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if (software_spi.Order == SOFTWARE_SPI_LSBFIRST) {
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Read_data <<= 1;
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Read_data |= Read_miso;
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} else {
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Read_data >>= 1;
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Read_data |= Read_miso << 7;
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}
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} else {
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SYSFS_GPIO_Write(software_spi.MOSI_PIN, ((value<<bit) & 0x80) ? HIGH : LOW);
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}
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// for(int j=delay; j > 0; j--);// DELAY
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SYSFS_GPIO_Write(software_spi.SCLK_PIN, 1);
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// for(int j=delay; j > 0; j--);// DELAY
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if (software_spi.CPHA) {
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SYSFS_GPIO_Write(software_spi.MOSI_PIN, ((value<<bit) & 0x80) ? HIGH : LOW);
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} else {
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Read_miso = SYSFS_GPIO_Read(software_spi.MISO_PIN);
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if (software_spi.Order == SOFTWARE_SPI_LSBFIRST) {
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Read_data <<= 1;
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Read_data |= Read_miso;
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} else {
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Read_data >>= 1;
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Read_data |= Read_miso << 7;
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}
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}
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// for(int j=delay; j > 0; j--);// DELAY
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}
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return Read_data;
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}
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