mirror of https://github.com/ARMmbed/mbed-os.git
Nordic: fix for Nordic PAN56 - reset twi master
This commit is based on Nordic's fix for an abnormality in some releases of the nrf51822 silicon. Without this fix, the I2C bus locks up and doesn't reset properly. The fix resets the TWI master on powerup. For more information see https://www.nordicsemi.com/eng/nordic/download_resource/24634/6/47696154 Nordic Product Anomaly ID 56.pull/1267/head
James Devine
parent
e50305122d
commit
668644c604
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@ -17,6 +17,7 @@
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#include "i2c_api.h"
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#include "cmsis.h"
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#include "pinmap.h"
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#include "twi_master.h"
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#include "mbed_error.h"
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// nRF51822's I2C_0 and SPI_0 (I2C_1, SPI_1 and SPIS1) share the same address.
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@ -53,7 +54,8 @@ void twi_master_init(i2c_t *obj, PinName sda, PinName scl, int frequency)
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void i2c_init(i2c_t *obj, PinName sda, PinName scl)
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{
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NRF_TWI_Type *i2c;
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twi_master_init_and_clear();
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NRF_TWI_Type *i2c = NULL;
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if (i2c0_spi0_peripheral.usage == I2C_SPI_PERIPHERAL_FOR_I2C &&
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i2c0_spi0_peripheral.sda_mosi == (uint8_t)sda &&
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@ -0,0 +1,20 @@
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/* Copyright (c) 2012 Nordic Semiconductor. All Rights Reserved.
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*
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* The information contained herein is property of Nordic Semiconductor ASA.
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* Terms and conditions of usage are described in detail in NORDIC
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* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
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*
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* Licensees are granted free, non-transferable use of the information. NO
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* WARRANTY of ANY KIND is provided. This heading must NOT be removed from
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* the file.
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*
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*/
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#ifndef TWI_MASTER_CONFIG
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#define TWI_MASTER_CONFIG
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#include "PinNames.h"
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#define TWI_MASTER_CONFIG_CLOCK_PIN_NUMBER (I2C_SCL0)
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#define TWI_MASTER_CONFIG_DATA_PIN_NUMBER (I2C_SDA0)
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#endif
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@ -0,0 +1,303 @@
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/* Copyright (c) 2009 Nordic Semiconductor. All Rights Reserved.
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*
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* The information contained herein is property of Nordic Semiconductor ASA.
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* Terms and conditions of usage are described in detail in NORDIC
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* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
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*
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* Licensees are granted free, non-transferable use of the information. NO
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* WARRANTY of ANY KIND is provided. This heading must NOT be removed from
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* the file.
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*
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*/
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#include "twi_master.h"
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#include "twi_config.h"
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#include <stdbool.h>
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#include <stdint.h>
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#include "nrf.h"
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#include "nrf_delay.h"
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/* Max cycles approximately to wait on RXDREADY and TXDREADY event,
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* This is optimized way instead of using timers, this is not power aware. */
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#define MAX_TIMEOUT_LOOPS (20000UL) /**< MAX while loops to wait for RXD/TXD event */
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static bool twi_master_write(uint8_t * data, uint8_t data_length, bool issue_stop_condition)
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{
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uint32_t timeout = MAX_TIMEOUT_LOOPS; /* max loops to wait for EVENTS_TXDSENT event*/
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if (data_length == 0)
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{
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/* Return false for requesting data of size 0 */
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return false;
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}
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NRF_TWI1->TXD = *data++;
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NRF_TWI1->TASKS_STARTTX = 1;
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/** @snippet [TWI HW master write] */
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while (true)
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{
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while (NRF_TWI1->EVENTS_TXDSENT == 0 && NRF_TWI1->EVENTS_ERROR == 0 && (--timeout))
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{
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// Do nothing.
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}
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if (timeout == 0 || NRF_TWI1->EVENTS_ERROR != 0)
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{
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// Recover the peripheral as indicated by PAN 56: "TWI: TWI module lock-up." found at
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// Product Anomaly Notification document found at
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// https://www.nordicsemi.com/eng/Products/Bluetooth-R-low-energy/nRF51822/#Downloads
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NRF_TWI1->EVENTS_ERROR = 0;
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NRF_TWI1->ENABLE = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos;
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NRF_TWI1->POWER = 0;
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nrf_delay_us(5);
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NRF_TWI1->POWER = 1;
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NRF_TWI1->ENABLE = TWI_ENABLE_ENABLE_Enabled << TWI_ENABLE_ENABLE_Pos;
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(void)twi_master_init_and_clear();
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return false;
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}
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NRF_TWI1->EVENTS_TXDSENT = 0;
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if (--data_length == 0)
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{
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break;
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}
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NRF_TWI1->TXD = *data++;
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}
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/** @snippet [TWI HW master write] */
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if (issue_stop_condition)
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{
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NRF_TWI1->EVENTS_STOPPED = 0;
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NRF_TWI1->TASKS_STOP = 1;
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/* Wait until stop sequence is sent */
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while(NRF_TWI1->EVENTS_STOPPED == 0)
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{
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// Do nothing.
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}
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}
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return true;
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}
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/** @brief Function for read by twi_master.
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*/
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static bool twi_master_read(uint8_t * data, uint8_t data_length, bool issue_stop_condition)
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{
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uint32_t timeout = MAX_TIMEOUT_LOOPS; /* max loops to wait for RXDREADY event*/
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if (data_length == 0)
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{
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/* Return false for requesting data of size 0 */
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return false;
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}
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else if (data_length == 1)
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{
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NRF_PPI->CH[0].TEP = (uint32_t)&NRF_TWI1->TASKS_STOP;
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}
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else
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{
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NRF_PPI->CH[0].TEP = (uint32_t)&NRF_TWI1->TASKS_SUSPEND;
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}
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NRF_PPI->CHENSET = PPI_CHENSET_CH0_Msk;
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NRF_TWI1->EVENTS_RXDREADY = 0;
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NRF_TWI1->TASKS_STARTRX = 1;
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/** @snippet [TWI HW master read] */
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while (true)
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{
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while (NRF_TWI1->EVENTS_RXDREADY == 0 && NRF_TWI1->EVENTS_ERROR == 0 && (--timeout))
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{
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// Do nothing.
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}
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NRF_TWI1->EVENTS_RXDREADY = 0;
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if (timeout == 0 || NRF_TWI1->EVENTS_ERROR != 0)
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{
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// Recover the peripheral as indicated by PAN 56: "TWI: TWI module lock-up." found at
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// Product Anomaly Notification document found at
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// https://www.nordicsemi.com/eng/Products/Bluetooth-R-low-energy/nRF51822/#Downloads
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NRF_TWI1->EVENTS_ERROR = 0;
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NRF_TWI1->ENABLE = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos;
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NRF_TWI1->POWER = 0;
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nrf_delay_us(5);
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NRF_TWI1->POWER = 1;
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NRF_TWI1->ENABLE = TWI_ENABLE_ENABLE_Enabled << TWI_ENABLE_ENABLE_Pos;
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(void)twi_master_init_and_clear();
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return false;
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}
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*data++ = NRF_TWI1->RXD;
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/* Configure PPI to stop TWI master before we get last BB event */
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if (--data_length == 1)
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{
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NRF_PPI->CH[0].TEP = (uint32_t)&NRF_TWI1->TASKS_STOP;
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}
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if (data_length == 0)
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{
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break;
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}
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// Recover the peripheral as indicated by PAN 56: "TWI: TWI module lock-up." found at
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// Product Anomaly Notification document found at
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// https://www.nordicsemi.com/eng/Products/Bluetooth-R-low-energy/nRF51822/#Downloads
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nrf_delay_us(20);
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NRF_TWI1->TASKS_RESUME = 1;
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}
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/** @snippet [TWI HW master read] */
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/* Wait until stop sequence is sent */
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while(NRF_TWI1->EVENTS_STOPPED == 0)
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{
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// Do nothing.
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}
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NRF_TWI1->EVENTS_STOPPED = 0;
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NRF_PPI->CHENCLR = PPI_CHENCLR_CH0_Msk;
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return true;
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}
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/**
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* @brief Function for detecting stuck slaves (SDA = 0 and SCL = 1) and tries to clear the bus.
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*
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* @return
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* @retval false Bus is stuck.
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* @retval true Bus is clear.
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*/
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static bool twi_master_clear_bus(void)
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{
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uint32_t twi_state;
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bool bus_clear;
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uint32_t clk_pin_config;
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uint32_t data_pin_config;
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// Save and disable TWI hardware so software can take control over the pins.
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twi_state = NRF_TWI1->ENABLE;
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NRF_TWI1->ENABLE = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos;
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clk_pin_config = \
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NRF_GPIO->PIN_CNF[TWI_MASTER_CONFIG_CLOCK_PIN_NUMBER];
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NRF_GPIO->PIN_CNF[TWI_MASTER_CONFIG_CLOCK_PIN_NUMBER] = \
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(GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) \
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| (GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) \
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| (GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos) \
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| (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) \
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| (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
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data_pin_config = \
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NRF_GPIO->PIN_CNF[TWI_MASTER_CONFIG_DATA_PIN_NUMBER];
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NRF_GPIO->PIN_CNF[TWI_MASTER_CONFIG_DATA_PIN_NUMBER] = \
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(GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) \
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| (GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) \
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| (GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos) \
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| (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) \
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| (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
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TWI_SDA_HIGH();
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TWI_SCL_HIGH();
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TWI_DELAY();
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if ((TWI_SDA_READ() == 1) && (TWI_SCL_READ() == 1))
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{
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bus_clear = true;
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}
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else
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{
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uint_fast8_t i;
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bus_clear = false;
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// Clock max 18 pulses worst case scenario(9 for master to send the rest of command and 9
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// for slave to respond) to SCL line and wait for SDA come high.
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for (i=18; i--;)
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{
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TWI_SCL_LOW();
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TWI_DELAY();
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TWI_SCL_HIGH();
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TWI_DELAY();
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if (TWI_SDA_READ() == 1)
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{
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bus_clear = true;
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break;
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}
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}
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}
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NRF_GPIO->PIN_CNF[TWI_MASTER_CONFIG_CLOCK_PIN_NUMBER] = clk_pin_config;
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NRF_GPIO->PIN_CNF[TWI_MASTER_CONFIG_DATA_PIN_NUMBER] = data_pin_config;
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NRF_TWI1->ENABLE = twi_state;
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return bus_clear;
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}
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/** @brief Function for initializing the twi_master.
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*/
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bool twi_master_init_and_clear(void)
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{
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/* To secure correct signal levels on the pins used by the TWI
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master when the system is in OFF mode, and when the TWI master is
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disabled, these pins must be configured in the GPIO peripheral.
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*/
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NRF_GPIO->PIN_CNF[TWI_MASTER_CONFIG_CLOCK_PIN_NUMBER] = \
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(GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) \
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| (GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) \
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| (GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos) \
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| (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) \
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| (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
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NRF_GPIO->PIN_CNF[TWI_MASTER_CONFIG_DATA_PIN_NUMBER] = \
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(GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) \
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| (GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) \
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| (GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos) \
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| (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) \
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| (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
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NRF_TWI1->EVENTS_RXDREADY = 0;
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NRF_TWI1->EVENTS_TXDSENT = 0;
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NRF_TWI1->PSELSCL = TWI_MASTER_CONFIG_CLOCK_PIN_NUMBER;
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NRF_TWI1->PSELSDA = TWI_MASTER_CONFIG_DATA_PIN_NUMBER;
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NRF_TWI1->FREQUENCY = TWI_FREQUENCY_FREQUENCY_K100 << TWI_FREQUENCY_FREQUENCY_Pos;
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NRF_PPI->CH[0].EEP = (uint32_t)&NRF_TWI1->EVENTS_BB;
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NRF_PPI->CH[0].TEP = (uint32_t)&NRF_TWI1->TASKS_SUSPEND;
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NRF_PPI->CHENCLR = PPI_CHENCLR_CH0_Msk;
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NRF_TWI1->ENABLE = TWI_ENABLE_ENABLE_Enabled << TWI_ENABLE_ENABLE_Pos;
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return twi_master_clear_bus();
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}
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/** @brief Function for transfer by twi_master.
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*/
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bool twi_master_transfer(uint8_t address,
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uint8_t * data,
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uint8_t data_length,
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bool issue_stop_condition)
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{
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bool transfer_succeeded = false;
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if (data_length > 0 && twi_master_clear_bus())
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{
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NRF_TWI1->ADDRESS = (address >> 1);
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if ((address & TWI_READ_BIT))
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{
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transfer_succeeded = twi_master_read(data, data_length, issue_stop_condition);
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}
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else
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{
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transfer_succeeded = twi_master_write(data, data_length, issue_stop_condition);
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}
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}
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return transfer_succeeded;
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}
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/*lint --flb "Leave library region" */
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@ -0,0 +1,99 @@
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/* Copyright (c) 2009 Nordic Semiconductor. All Rights Reserved.
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*
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* The information contained herein is property of Nordic Semiconductor ASA.
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* Terms and conditions of usage are described in detail in NORDIC
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* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
|
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*
|
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* Licensees are granted free, non-transferable use of the information. NO
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* WARRANTY of ANY KIND is provided. This heading must NOT be removed from
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* the file.
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*
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*/
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#ifndef TWI_MASTER_H
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#define TWI_MASTER_H
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/*lint ++flb "Enter library region" */
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#include <stdbool.h>
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#include <stdint.h>
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/** @file
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* @brief Software controlled TWI Master driver.
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*
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*
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* @defgroup lib_driver_twi_master Software controlled TWI Master driver
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* @{
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* @ingroup nrf_drivers
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* @brief Software controlled TWI Master driver.
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*
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* Supported features:
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* - Repeated start
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* - No multi-master
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* - Only 7-bit addressing
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* - Supports clock stretching (with optional SMBus style slave timeout)
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* - Tries to handle slaves stuck in the middle of transfer
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*/
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#define TWI_READ_BIT (0x01) //!< If this bit is set in the address field, transfer direction is from slave to master.
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#define TWI_ISSUE_STOP ((bool)true) //!< Parameter for @ref twi_master_transfer
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#define TWI_DONT_ISSUE_STOP ((bool)false) //!< Parameter for @ref twi_master_transfer
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/* These macros are needed to see if the slave is stuck and we as master send dummy clock cycles to end its wait */
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/*lint -e717 -save "Suppress do {} while (0) for these macros" */
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/*lint ++flb "Enter library region" */
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#define TWI_SCL_HIGH() do { NRF_GPIO->OUTSET = (1UL << TWI_MASTER_CONFIG_CLOCK_PIN_NUMBER); } while(0) /*!< Pulls SCL line high */
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#define TWI_SCL_LOW() do { NRF_GPIO->OUTCLR = (1UL << TWI_MASTER_CONFIG_CLOCK_PIN_NUMBER); } while(0) /*!< Pulls SCL line low */
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#define TWI_SDA_HIGH() do { NRF_GPIO->OUTSET = (1UL << TWI_MASTER_CONFIG_DATA_PIN_NUMBER); } while(0) /*!< Pulls SDA line high */
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#define TWI_SDA_LOW() do { NRF_GPIO->OUTCLR = (1UL << TWI_MASTER_CONFIG_DATA_PIN_NUMBER); } while(0) /*!< Pulls SDA line low */
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#define TWI_SDA_INPUT() do { NRF_GPIO->DIRCLR = (1UL << TWI_MASTER_CONFIG_DATA_PIN_NUMBER); } while(0) /*!< Configures SDA pin as input */
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#define TWI_SDA_OUTPUT() do { NRF_GPIO->DIRSET = (1UL << TWI_MASTER_CONFIG_DATA_PIN_NUMBER); } while(0) /*!< Configures SDA pin as output */
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#define TWI_SCL_OUTPUT() do { NRF_GPIO->DIRSET = (1UL << TWI_MASTER_CONFIG_CLOCK_PIN_NUMBER); } while(0) /*!< Configures SCL pin as output */
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/*lint -restore */
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#define TWI_SDA_READ() ((NRF_GPIO->IN >> TWI_MASTER_CONFIG_DATA_PIN_NUMBER) & 0x1UL) /*!< Reads current state of SDA */
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#define TWI_SCL_READ() ((NRF_GPIO->IN >> TWI_MASTER_CONFIG_CLOCK_PIN_NUMBER) & 0x1UL) /*!< Reads current state of SCL */
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#define TWI_DELAY() nrf_delay_us(4) /*!< Time to wait when pin states are changed. For fast-mode the delay can be zero and for standard-mode 4 us delay is sufficient. */
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||||
|
||||
|
||||
/**
|
||||
* @brief Function for initializing TWI bus IO pins and checks if the bus is operational.
|
||||
*
|
||||
* Both pins are configured as Standard-0, No-drive-1 (open drain).
|
||||
*
|
||||
* @return
|
||||
* @retval true TWI bus is clear for transfers.
|
||||
* @retval false TWI bus is stuck.
|
||||
*/
|
||||
bool twi_master_init_and_clear(void);
|
||||
|
||||
/**
|
||||
* @brief Function for transferring data over TWI bus.
|
||||
*
|
||||
* If TWI master detects even one NACK from the slave or timeout occurs, STOP condition is issued
|
||||
* and the function returns false.
|
||||
* Bit 0 (@ref TWI_READ_BIT) in the address parameter controls transfer direction;
|
||||
* - If 1, master reads data_length number of bytes from the slave
|
||||
* - If 0, master writes data_length number of bytes to the slave.
|
||||
*
|
||||
* @note Make sure at least data_length number of bytes is allocated in data if TWI_READ_BIT is set.
|
||||
* @note @ref TWI_ISSUE_STOP
|
||||
*
|
||||
* @param address Data transfer direction (LSB) / Slave address (7 MSBs).
|
||||
* @param data Pointer to data.
|
||||
* @param data_length Number of bytes to transfer.
|
||||
* @param issue_stop_condition If @ref TWI_ISSUE_STOP, STOP condition is issued before exiting function. If @ref TWI_DONT_ISSUE_STOP, STOP condition is not issued before exiting function. If transfer failed for any reason, STOP condition will be issued in any case.
|
||||
* @return
|
||||
* @retval true Data transfer succeeded without errors.
|
||||
* @retval false Data transfer failed.
|
||||
*/
|
||||
bool twi_master_transfer(uint8_t address, uint8_t *data, uint8_t data_length, bool issue_stop_condition);
|
||||
|
||||
/**
|
||||
*@}
|
||||
**/
|
||||
|
||||
/*lint --flb "Leave library region" */
|
||||
#endif //TWI_MASTER_H
|
||||
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Reference in New Issue