104 lines
2.1 KiB
C
104 lines
2.1 KiB
C
#include "soft_i2c.h"
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#include "delay.h"
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#include "ti_msp_dl_config.h"
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#define DELAY 1
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#define SDA_PIN_SHIFT 9 // if pa.8 shift8 , if pa.9 shift 9
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void I2C_ENABLE_OUTPUT_SDA(void) {
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DL_GPIO_initDigitalOutput(SOFT_I2C_SDA_IOMUX);
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DL_GPIO_enableOutput(SOFT_I2C_PORT, SOFT_I2C_SDA_PIN);
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}
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void I2C_ENABLE_INPUT_SDA(void) {
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DL_GPIO_disableOutput(SOFT_I2C_PORT, SOFT_I2C_SDA_PIN);
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DL_GPIO_initDigitalInputFeatures(
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SOFT_I2C_SDA_IOMUX, DL_GPIO_INVERSION_DISABLE, DL_GPIO_RESISTOR_PULL_UP,
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DL_GPIO_HYSTERESIS_DISABLE, DL_GPIO_WAKEUP_DISABLE);
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}
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void I2C_W_SCL(uint8_t BitValue) {
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if (BitValue) {
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DL_GPIO_setPins(SOFT_I2C_PORT, SOFT_I2C_CLK_PIN);
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} else {
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DL_GPIO_clearPins(SOFT_I2C_PORT, SOFT_I2C_CLK_PIN);
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}
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delay_us(DELAY);
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}
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void I2C_W_SDA(uint8_t BitValue) {
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if (BitValue) {
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DL_GPIO_setPins(SOFT_I2C_PORT, SOFT_I2C_SDA_PIN);
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} else {
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DL_GPIO_clearPins(SOFT_I2C_PORT, SOFT_I2C_SDA_PIN);
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}
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delay_us(DELAY);
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}
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// 读取时钟线数据
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uint8_t I2C_R_SDA(void) {
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uint32_t BitValue;
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BitValue = DL_GPIO_readPins(SOFT_I2C_PORT, SOFT_I2C_SDA_PIN);
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return (uint8_t)(BitValue >> 9);
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}
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void I2C_Start(void) {
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I2C_W_SCL(1);
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I2C_W_SDA(1);
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I2C_W_SDA(0);
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I2C_W_SCL(0);
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}
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void I2C_Stop(void) {
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I2C_W_SDA(0);
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I2C_W_SCL(1);
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I2C_W_SDA(1);
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}
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void I2C_SendByte(uint8_t Byte) {
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uint8_t i;
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for (i = 0; i < 8; i++) {
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I2C_W_SDA(Byte & (0x80 >> i));
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I2C_W_SCL(1);
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I2C_W_SCL(0);
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}
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}
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uint8_t I2C_RecviveData(void) {
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uint8_t i, Byte = 0x00;
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I2C_W_SDA(1);
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for (i = 0; i < 8; i++) {
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I2C_ENABLE_INPUT_SDA();
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I2C_W_SCL(1);
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if (I2C_R_SDA() == 1) {
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Byte |= (0x80 >> i);
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}
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I2C_W_SCL(0);
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I2C_ENABLE_OUTPUT_SDA();
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}
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return Byte;
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}
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void I2C_SendAck(uint8_t AckBit) {
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I2C_W_SDA(AckBit);
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I2C_W_SCL(1);
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I2C_W_SCL(0);
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}
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uint8_t I2C_RecviveAck(void) {
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uint8_t AckBit;
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I2C_W_SDA(1);
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I2C_ENABLE_INPUT_SDA();
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I2C_W_SCL(1);
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AckBit = I2C_R_SDA();
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I2C_W_SCL(0);
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I2C_ENABLE_OUTPUT_SDA();
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return AckBit;
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}
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