81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
#include "spi.h"
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#include "gpio.h"
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static SPI_CTRL_TYPE * SPI_MASTER_CTRL = ((SPI_CTRL_TYPE *) SPI_MASTER_BASE);
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void spi_init(enum spi_interface interface)
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{
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PIN_CONFIG->PIN_23_SEL = PIN_SEL_SPIM_CLK; //CLK
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PIN_CONFIG->PIN_22_SEL = PIN_SEL_SPIM_MISO; // DI
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PIN_CONFIG->PIN_20_SEL = PIN_SEL_SPIM_CSN; // CS
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PIN_CONFIG->PIN_24_SEL = PIN_SEL_SPIM_MOSI; // DO
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SPI_MASTER_CTRL->MSB = 1;
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SPI_MASTER_CTRL->SPEED = 0; //数字越小，速度越快
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#if 1
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SPI_MASTER_CTRL->CPOL = 0;
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SPI_MASTER_CTRL->CPHA = 0;
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#elif 0
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//untested
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SPI_MASTER_CTRL->CPOL = 0;
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SPI_MASTER_CTRL->CPHA = 1;
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#elif 0
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//untested
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SPI_MASTER_CTRL->CPOL = 1;
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SPI_MASTER_CTRL->CPHA = 0;
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#else
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SPI_MASTER_CTRL->CPOL = 1;
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SPI_MASTER_CTRL->CPHA = 1;
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#endif
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}
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void spi_cs_enable(enum spi_interface interface)
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{
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SPI_MASTER_CTRL->PE = 1; // CS Low
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}
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void spi_cs_disable(enum spi_interface interface)
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{
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SPI_MASTER_CTRL->PE = 0; // CS High
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}
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/***********************************************************
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spi写函数
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输入参数：uint8_t *p_data 指向要发送的数据
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uint8_t num 数据的长度
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***********************************************************/
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void spi_write(uint8_t *p_data,uint16_t num)
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{
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// tx data
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for(;num>0;num--)
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{
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SPI_MASTER_CTRL->OUT = *p_data;
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SPI_MASTER_CTRL->START = 1;
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p_data++;
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while(SPI_MASTER_CTRL->START == 1);
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SPI_MASTER_CTRL->DONE = 0;
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}
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}
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/***********************************************************
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spi读函数
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输入参数：uint8_t *p_data 指向要接收数据的位置
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uint8_t num 数据的长度
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***********************************************************/
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void spi_read(uint8_t *p_data,uint16_t num)
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{
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// rx data
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for(;num>0;num--)
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{
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SPI_MASTER_CTRL->OUT = 0xFF;
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SPI_MASTER_CTRL->START = 1;
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while(SPI_MASTER_CTRL->START == 1);
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*p_data = SPI_MASTER_CTRL->IN;
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p_data++;
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SPI_MASTER_CTRL->DONE = 0;
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}
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}
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