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Improved software I2C routines for MD-UV3x0 AT1846S driver

replace/7e9966585925bc88692703548f146db0f40f689c
Silvano Seva 2021-03-20 22:46:43 +01:00
rodzic cfe2a609d5
commit 97e234ecf6
1 zmienionych plików z 36 dodań i 39 usunięć
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75
platform/drivers/baseband/interfaces_UV3x0.c
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@ -24,14 +24,13 @@
#include <interfaces/platform.h>
#include <stdint.h>
#include <string.h>
#include <stdbool.h>
#include "interfaces.h"
void _i2c_start();
void _i2c_stop();
void _i2c_ack();
void _i2c_nack();
void _i2c_write(uint8_t val);
uint8_t _i2c_read();
uint8_t _i2c_read(bool ack);
/*
* Implementation of AT1846S I2C interface.
@ -46,6 +45,8 @@ void i2c_init()
{
gpio_setMode(I2C_SDA, INPUT);
gpio_setMode(I2C_SCL, OUTPUT);
gpio_setOutputSpeed(I2C_SDA, HIGH);
gpio_setOutputSpeed(I2C_SCL, HIGH);
gpio_clearPin(I2C_SCL);
}
@ -74,10 +75,8 @@ uint16_t i2c_readReg16(uint8_t reg)
_i2c_write(reg);
_i2c_start();
_i2c_write(devAddr | 0x01);
uint8_t valHi = _i2c_read();
_i2c_ack();
uint8_t valLo = _i2c_read();
_i2c_nack();
uint8_t valHi = _i2c_read(true);
uint8_t valLo = _i2c_read(false);
_i2c_stop();
return (valHi << 8) | valLo;
@ -132,8 +131,12 @@ void _i2c_start()
{
gpio_setMode(I2C_SDA, OUTPUT);
/*
* Lines commented to keep SCL high when idle
*
gpio_clearPin(I2C_SCL);
delayUs(2);
*/
gpio_setPin(I2C_SDA);
delayUs(2);
@ -164,38 +167,12 @@ void _i2c_stop()
gpio_setPin(I2C_SDA);
delayUs(2);
/*
* Lines commented to keep SCL high when idle
*
gpio_clearPin(I2C_SCL);
delayUs(2);
}
void _i2c_ack()
{
gpio_setMode(I2C_SDA, OUTPUT);
gpio_clearPin(I2C_SDA);
gpio_clearPin(I2C_SCL);
delayUs(2);
gpio_setPin(I2C_SCL);
delayUs(2);
gpio_clearPin(I2C_SCL);
delayUs(2);
}
void _i2c_nack()
{
gpio_setMode(I2C_SDA, OUTPUT);
gpio_setPin(I2C_SDA);
gpio_clearPin(I2C_SCL);
delayUs(2);
gpio_setPin(I2C_SCL);
delayUs(2);
gpio_clearPin(I2C_SCL);
delayUs(2);
*/
}
void _i2c_write(uint8_t val)
@ -224,15 +201,21 @@ void _i2c_write(uint8_t val)
/* Clock cycle for slave ACK/NACK */
gpio_setMode(I2C_SDA, INPUT);
gpio_clearPin(I2C_SCL);
delayUs(2);
gpio_setPin(I2C_SCL);
delayUs(2);
gpio_clearPin(I2C_SCL);
/* Asserting SDA pin allows to fastly bring the line to idle state */
gpio_setMode(I2C_SDA, OUTPUT);
gpio_setPin(I2C_SDA);
delayUs(8);
}
uint8_t _i2c_read()
uint8_t _i2c_read(bool ack)
{
gpio_setMode(I2C_SDA, INPUT);
gpio_clearPin(I2C_SCL);
@ -240,6 +223,7 @@ uint8_t _i2c_read()
uint8_t value = 0;
for(uint8_t i = 0; i < 8; i++)
{
delayUs(2);
gpio_setPin(I2C_SCL);
delayUs(2);
@ -247,8 +231,21 @@ uint8_t _i2c_read()
value |= gpio_readPin(I2C_SDA);
gpio_clearPin(I2C_SCL);
delayUs(2);
}
/*
* Set ACK/NACK state BEFORE putting SDA gpio to output mode.
* This avoids spurious spikes which can be interpreted as NACKs
*/
ack ? gpio_clearPin(I2C_SDA) : gpio_setPin(I2C_SDA);
gpio_setMode(I2C_SDA, OUTPUT);
/* Clock cycle for ACK/NACK */
delayUs(2);
gpio_setPin(I2C_SCL);
delayUs(2);
gpio_clearPin(I2C_SCL);
delayUs(2);
return value;
}