diff options
Diffstat (limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/components/drivers_nrf/twi_master/deprecated/twi_hw_master.c')
| -rw-r--r-- | thirdparty/nRF5_SDK_15.0.0_a53641a/components/drivers_nrf/twi_master/deprecated/twi_hw_master.c | 331 |
1 files changed, 331 insertions, 0 deletions
diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/components/drivers_nrf/twi_master/deprecated/twi_hw_master.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/drivers_nrf/twi_master/deprecated/twi_hw_master.c new file mode 100644 index 0000000..e3692a3 --- /dev/null +++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/drivers_nrf/twi_master/deprecated/twi_hw_master.c @@ -0,0 +1,331 @@ +/** + * Copyright (c) 2009 - 2018, Nordic Semiconductor ASA + * + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form, except as embedded into a Nordic + * Semiconductor ASA integrated circuit in a product or a software update for + * such product, must reproduce the above copyright notice, this list of + * conditions and the following disclaimer in the documentation and/or other + * materials provided with the distribution. + * + * 3. Neither the name of Nordic Semiconductor ASA nor the names of its + * contributors may be used to endorse or promote products derived from this + * software without specific prior written permission. + * + * 4. This software, with or without modification, must only be used with a + * Nordic Semiconductor ASA integrated circuit. + * + * 5. Any software provided in binary form under this license must not be reverse + * engineered, decompiled, modified and/or disassembled. + * + * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS + * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE + * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ +#include "twi_master.h" +#include "twi_master_config.h" +#include <stdbool.h> +#include <stdint.h> +#include "nrf.h" +#include "nrf_delay.h" +#include "nrf_gpio.h" + +/* Max cycles approximately to wait on RXDREADY and TXDREADY event, + * This is optimized way instead of using timers, this is not power aware. */ +#define MAX_TIMEOUT_LOOPS (20000UL) /**< MAX while loops to wait for RXD/TXD event */ + +static bool twi_master_write(uint8_t * data, uint8_t data_length, bool issue_stop_condition) +{ + uint32_t timeout = MAX_TIMEOUT_LOOPS; /* max loops to wait for EVENTS_TXDSENT event*/ + + if (data_length == 0) + { + /* Return false for requesting data of size 0 */ + return false; + } + + NRF_TWI1->TXD = *data++; + NRF_TWI1->TASKS_STARTTX = 1; + + /** @snippet [TWI HW master write] */ + while (true) + { + while (NRF_TWI1->EVENTS_TXDSENT == 0 && NRF_TWI1->EVENTS_ERROR == 0 && (--timeout)) + { + // Do nothing. + } + + if (timeout == 0 || NRF_TWI1->EVENTS_ERROR != 0) + { + // Recover the peripheral as indicated by PAN 56: "TWI: TWI module lock-up." found at + // Product Anomaly Notification document found at + // https://www.nordicsemi.com/eng/Products/Bluetooth-R-low-energy/nRF51822/#Downloads + NRF_TWI1->EVENTS_ERROR = 0; + NRF_TWI1->ENABLE = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos; + NRF_TWI1->POWER = 0; + nrf_delay_us(5); + NRF_TWI1->POWER = 1; + NRF_TWI1->ENABLE = TWI_ENABLE_ENABLE_Enabled << TWI_ENABLE_ENABLE_Pos; + + (void)twi_master_init(); + + return false; + } + NRF_TWI1->EVENTS_TXDSENT = 0; + if (--data_length == 0) + { + break; + } + + NRF_TWI1->TXD = *data++; + } + /** @snippet [TWI HW master write] */ + + if (issue_stop_condition) + { + NRF_TWI1->EVENTS_STOPPED = 0; + NRF_TWI1->TASKS_STOP = 1; + /* Wait until stop sequence is sent */ + while (NRF_TWI1->EVENTS_STOPPED == 0) + { + // Do nothing. + } + } + return true; +} + + +/** @brief Function for read by twi_master. + */ +static bool twi_master_read(uint8_t * data, uint8_t data_length, bool issue_stop_condition) +{ + uint32_t timeout = MAX_TIMEOUT_LOOPS; /* max loops to wait for RXDREADY event*/ + + if (data_length == 0) + { + /* Return false for requesting data of size 0 */ + return false; + } + else if (data_length == 1) + { + NRF_PPI->CH[0].TEP = (uint32_t)&NRF_TWI1->TASKS_STOP; + } + else + { + NRF_PPI->CH[0].TEP = (uint32_t)&NRF_TWI1->TASKS_SUSPEND; + } + + NRF_PPI->CHENSET = PPI_CHENSET_CH0_Msk; + NRF_TWI1->EVENTS_RXDREADY = 0; + NRF_TWI1->TASKS_STARTRX = 1; + + /** @snippet [TWI HW master read] */ + while (true) + { + while (NRF_TWI1->EVENTS_RXDREADY == 0 && NRF_TWI1->EVENTS_ERROR == 0 && (--timeout)) + { + // Do nothing. + } + NRF_TWI1->EVENTS_RXDREADY = 0; + + if (timeout == 0 || NRF_TWI1->EVENTS_ERROR != 0) + { + // Recover the peripheral as indicated by PAN 56: "TWI: TWI module lock-up." found at + // Product Anomaly Notification document found at + // https://www.nordicsemi.com/eng/Products/Bluetooth-R-low-energy/nRF51822/#Downloads + NRF_TWI1->EVENTS_ERROR = 0; + NRF_TWI1->ENABLE = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos; + NRF_TWI1->POWER = 0; + nrf_delay_us(5); + NRF_TWI1->POWER = 1; + NRF_TWI1->ENABLE = TWI_ENABLE_ENABLE_Enabled << TWI_ENABLE_ENABLE_Pos; + + (void)twi_master_init(); + + return false; + } + + *data++ = NRF_TWI1->RXD; + + /* Configure PPI to stop TWI master before we get last BB event */ + if (--data_length == 1) + { + NRF_PPI->CH[0].TEP = (uint32_t)&NRF_TWI1->TASKS_STOP; + } + + if (data_length == 0) + { + break; + } + + // Recover the peripheral as indicated by PAN 56: "TWI: TWI module lock-up." found at + // Product Anomaly Notification document found at + // https://www.nordicsemi.com/eng/Products/Bluetooth-R-low-energy/nRF51822/#Downloads + nrf_delay_us(20); + NRF_TWI1->TASKS_RESUME = 1; + } + /** @snippet [TWI HW master read] */ + + /* Wait until stop sequence is sent */ + while (NRF_TWI1->EVENTS_STOPPED == 0) + { + // Do nothing. + } + NRF_TWI1->EVENTS_STOPPED = 0; + + NRF_PPI->CHENCLR = PPI_CHENCLR_CH0_Msk; + return true; +} + + +/** + * @brief Function for detecting stuck slaves (SDA = 0 and SCL = 1) and tries to clear the bus. + * + * @return + * @retval false Bus is stuck. + * @retval true Bus is clear. + */ +static bool twi_master_clear_bus(void) +{ + uint32_t twi_state; + bool bus_clear; + uint32_t clk_pin_config; + uint32_t data_pin_config; + + // Save and disable TWI hardware so software can take control over the pins. + twi_state = NRF_TWI1->ENABLE; + NRF_TWI1->ENABLE = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos; + + clk_pin_config = \ + NRF_GPIO->PIN_CNF[TWI_MASTER_CONFIG_CLOCK_PIN_NUMBER]; + NRF_GPIO->PIN_CNF[TWI_MASTER_CONFIG_CLOCK_PIN_NUMBER] = \ + (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) \ + | (GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) \ + | (GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos) \ + | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) \ + | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos); + + data_pin_config = \ + NRF_GPIO->PIN_CNF[TWI_MASTER_CONFIG_DATA_PIN_NUMBER]; + NRF_GPIO->PIN_CNF[TWI_MASTER_CONFIG_DATA_PIN_NUMBER] = \ + (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) \ + | (GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) \ + | (GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos) \ + | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) \ + | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos); + + TWI_SDA_HIGH(); + TWI_SCL_HIGH(); + TWI_DELAY(); + + if ((TWI_SDA_READ() == 1) && (TWI_SCL_READ() == 1)) + { + bus_clear = true; + } + else + { + uint_fast8_t i; + bus_clear = false; + + // Clock max 18 pulses worst case scenario(9 for master to send the rest of command and 9 + // for slave to respond) to SCL line and wait for SDA come high. + for (i=18; i--;) + { + TWI_SCL_LOW(); + TWI_DELAY(); + TWI_SCL_HIGH(); + TWI_DELAY(); + + if (TWI_SDA_READ() == 1) + { + bus_clear = true; + break; + } + } + } + + NRF_GPIO->PIN_CNF[TWI_MASTER_CONFIG_CLOCK_PIN_NUMBER] = clk_pin_config; + NRF_GPIO->PIN_CNF[TWI_MASTER_CONFIG_DATA_PIN_NUMBER] = data_pin_config; + + NRF_TWI1->ENABLE = twi_state; + + return bus_clear; +} + + +/** @brief Function for initializing the twi_master. + */ +bool twi_master_init(void) +{ + /* To secure correct signal levels on the pins used by the TWI + master when the system is in OFF mode, and when the TWI master is + disabled, these pins must be configured in the GPIO peripheral. + */ + NRF_GPIO->PIN_CNF[TWI_MASTER_CONFIG_CLOCK_PIN_NUMBER] = \ + (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) \ + | (GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) \ + | (GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos) \ + | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) \ + | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos); + + NRF_GPIO->PIN_CNF[TWI_MASTER_CONFIG_DATA_PIN_NUMBER] = \ + (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) \ + | (GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) \ + | (GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos) \ + | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) \ + | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos); + + NRF_TWI1->EVENTS_RXDREADY = 0; + NRF_TWI1->EVENTS_TXDSENT = 0; + NRF_TWI1->PSELSCL = TWI_MASTER_CONFIG_CLOCK_PIN_NUMBER; + NRF_TWI1->PSELSDA = TWI_MASTER_CONFIG_DATA_PIN_NUMBER; + NRF_TWI1->FREQUENCY = TWI_FREQUENCY_FREQUENCY_K100 << TWI_FREQUENCY_FREQUENCY_Pos; + NRF_PPI->CH[0].EEP = (uint32_t)&NRF_TWI1->EVENTS_BB; + NRF_PPI->CH[0].TEP = (uint32_t)&NRF_TWI1->TASKS_SUSPEND; + NRF_PPI->CHENCLR = PPI_CHENCLR_CH0_Msk; + NRF_TWI1->ENABLE = TWI_ENABLE_ENABLE_Enabled << TWI_ENABLE_ENABLE_Pos; + + return twi_master_clear_bus(); +} + + +/** @brief Function for transfer by twi_master. + */ +bool twi_master_transfer(uint8_t address, + uint8_t * data, + uint8_t data_length, + bool issue_stop_condition) +{ + bool transfer_succeeded = false; + if (data_length > 0 && twi_master_clear_bus()) + { + NRF_TWI1->ADDRESS = (address >> 1); + + if ((address & TWI_READ_BIT)) + { + transfer_succeeded = twi_master_read(data, data_length, issue_stop_condition); + } + else + { + transfer_succeeded = twi_master_write(data, data_length, issue_stop_condition); + } + } + return transfer_succeeded; +} + +/*lint --flb "Leave library region" */ |