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Merge pull request #2139 from atiselsts/sensortag-i2c/limited_busywait 

CC26xx SensorTag I2C: add and use LIMITED_BUSYWAIT macro
pull/2/head
George Oikonomou 2017-03-17 23:04:19 +00:00 committed by GitHub
parent b91448dfa4 a0a2881ab0
commit 21d6abe30b
1 changed files with 30 additions and 17 deletions
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47
platform/srf06-cc26xx/sensortag/board-i2c.c
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2014, Texas Instruments Incorporated - http://www.ti.com/
* Copyright (c) 2017, University of Bristol - http://www.bris.ac.uk/
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -40,10 +41,22 @@
#include "ti-lib.h"
#include "board-i2c.h"
#include "lpm.h"
#include "rtimer.h"
#include <string.h>
#include <stdbool.h>
/*---------------------------------------------------------------------------*/
#define I2C_MAX_WAIT_TIME (RTIMER_SECOND / 10)
#define LIMITED_BUSYWAIT(cond) do { \
rtimer_clock_t end_time = RTIMER_NOW() + I2C_MAX_WAIT_TIME; \
while(cond) { \
if(!RTIMER_CLOCK_LT(RTIMER_NOW(), end_time)) { \
return false; \
} \
} \
} while(0)
/*---------------------------------------------------------------------------*/
#define NO_INTERFACE 0xFF
/*---------------------------------------------------------------------------*/
static uint8_t slave_addr = 0x00;
@ -141,11 +154,11 @@ board_i2c_write(uint8_t *data, uint8_t len)
ti_lib_i2c_master_data_put(I2C0_BASE, data[0]);
/* Check if another master has access */
while(ti_lib_i2c_master_bus_busy(I2C0_BASE));
LIMITED_BUSYWAIT(ti_lib_i2c_master_bus_busy(I2C0_BASE));
/* Assert RUN + START */
ti_lib_i2c_master_control(I2C0_BASE, I2C_MASTER_CMD_BURST_SEND_START);
while(ti_lib_i2c_master_busy(I2C0_BASE));
LIMITED_BUSYWAIT(ti_lib_i2c_master_busy(I2C0_BASE));
success = i2c_status();
for(i = 1; i < len && success; i++) {
@ -154,7 +167,7 @@ board_i2c_write(uint8_t *data, uint8_t len)
if(i < len - 1) {
/* Clear START */
ti_lib_i2c_master_control(I2C0_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);
while(ti_lib_i2c_master_busy(I2C0_BASE));
LIMITED_BUSYWAIT(ti_lib_i2c_master_busy(I2C0_BASE));
success = i2c_status();
}
}
@ -163,9 +176,9 @@ board_i2c_write(uint8_t *data, uint8_t len)
if(success) {
/* Assert STOP */
ti_lib_i2c_master_control(I2C0_BASE, I2C_MASTER_CMD_BURST_SEND_FINISH);
while(ti_lib_i2c_master_busy(I2C0_BASE));
LIMITED_BUSYWAIT(ti_lib_i2c_master_busy(I2C0_BASE));
success = i2c_status();
while(ti_lib_i2c_master_bus_busy(I2C0_BASE));
LIMITED_BUSYWAIT(ti_lib_i2c_master_bus_busy(I2C0_BASE));
}
return success;
@ -181,11 +194,11 @@ board_i2c_write_single(uint8_t data)
ti_lib_i2c_master_data_put(I2C0_BASE, data);
/* Check if another master has access */
while(ti_lib_i2c_master_bus_busy(I2C0_BASE));
LIMITED_BUSYWAIT(ti_lib_i2c_master_bus_busy(I2C0_BASE));
/* Assert RUN + START + STOP */
ti_lib_i2c_master_control(I2C0_BASE, I2C_MASTER_CMD_SINGLE_SEND);
while(ti_lib_i2c_master_busy(I2C0_BASE));
LIMITED_BUSYWAIT(ti_lib_i2c_master_busy(I2C0_BASE));
return i2c_status();
}
@ -200,7 +213,7 @@ board_i2c_read(uint8_t *data, uint8_t len)
ti_lib_i2c_master_slave_addr_set(I2C0_BASE, slave_addr, true);
/* Check if another master has access */
while(ti_lib_i2c_master_bus_busy(I2C0_BASE));
LIMITED_BUSYWAIT(ti_lib_i2c_master_bus_busy(I2C0_BASE));
/* Assert RUN + START + ACK */
ti_lib_i2c_master_control(I2C0_BASE, I2C_MASTER_CMD_BURST_RECEIVE_START);
@ -208,7 +221,7 @@ board_i2c_read(uint8_t *data, uint8_t len)
i = 0;
success = true;
while(i < (len - 1) && success) {
while(ti_lib_i2c_master_busy(I2C0_BASE));
LIMITED_BUSYWAIT(ti_lib_i2c_master_busy(I2C0_BASE));
success = i2c_status();
if(success) {
data[i] = ti_lib_i2c_master_data_get(I2C0_BASE);
@ -219,11 +232,11 @@ board_i2c_read(uint8_t *data, uint8_t len)
if(success) {
ti_lib_i2c_master_control(I2C0_BASE, I2C_MASTER_CMD_BURST_RECEIVE_FINISH);
while(ti_lib_i2c_master_busy(I2C0_BASE));
LIMITED_BUSYWAIT(ti_lib_i2c_master_busy(I2C0_BASE));
success = i2c_status();
if(success) {
data[len - 1] = ti_lib_i2c_master_data_get(I2C0_BASE);
while(ti_lib_i2c_master_bus_busy(I2C0_BASE));
LIMITED_BUSYWAIT(ti_lib_i2c_master_bus_busy(I2C0_BASE));
}
}
@ -243,11 +256,11 @@ board_i2c_write_read(uint8_t *wdata, uint8_t wlen, uint8_t *rdata, uint8_t rlen)
ti_lib_i2c_master_data_put(I2C0_BASE, wdata[0]);
/* Check if another master has access */
while(ti_lib_i2c_master_bus_busy(I2C0_BASE));
LIMITED_BUSYWAIT(ti_lib_i2c_master_bus_busy(I2C0_BASE));
/* Assert RUN + START */
ti_lib_i2c_master_control(I2C0_BASE, I2C_MASTER_CMD_BURST_SEND_START);
while(ti_lib_i2c_master_busy(I2C0_BASE));
LIMITED_BUSYWAIT(ti_lib_i2c_master_busy(I2C0_BASE));
success = i2c_status();
for(i = 1; i < wlen && success; i++) {
@ -256,7 +269,7 @@ board_i2c_write_read(uint8_t *wdata, uint8_t wlen, uint8_t *rdata, uint8_t rlen)
/* Clear START */
ti_lib_i2c_master_control(I2C0_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);
while(ti_lib_i2c_master_busy(I2C0_BASE));
LIMITED_BUSYWAIT(ti_lib_i2c_master_busy(I2C0_BASE));
success = i2c_status();
}
if(!success) {
@ -271,7 +284,7 @@ board_i2c_write_read(uint8_t *wdata, uint8_t wlen, uint8_t *rdata, uint8_t rlen)
i = 0;
while(i < (rlen - 1) && success) {
while(ti_lib_i2c_master_busy(I2C0_BASE));
LIMITED_BUSYWAIT(ti_lib_i2c_master_busy(I2C0_BASE));
success = i2c_status();
if(success) {
rdata[i] = ti_lib_i2c_master_data_get(I2C0_BASE);
@ -282,11 +295,11 @@ board_i2c_write_read(uint8_t *wdata, uint8_t wlen, uint8_t *rdata, uint8_t rlen)
if(success) {
ti_lib_i2c_master_control(I2C0_BASE, I2C_MASTER_CMD_BURST_RECEIVE_FINISH);
while(ti_lib_i2c_master_busy(I2C0_BASE));
LIMITED_BUSYWAIT(ti_lib_i2c_master_busy(I2C0_BASE));
success = i2c_status();
if(success) {
rdata[rlen - 1] = ti_lib_i2c_master_data_get(I2C0_BASE);
while(ti_lib_i2c_master_bus_busy(I2C0_BASE));
LIMITED_BUSYWAIT(ti_lib_i2c_master_bus_busy(I2C0_BASE));
}
}