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pull/1394/head
Tim Hutt 2015-10-28 14:01:14 +00:00
parent 8aaee5aa4f
commit dbbe290da9
1 changed files with 49 additions and 49 deletions
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98
libraries/mbed/targets/hal/TARGET_NORDIC/TARGET_MCU_NRF51822/twi_master.c
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@ -31,13 +31,13 @@ static bool twi_master_write(uint8_t * data, uint8_t data_length, bool issue_sto
return false;
}
twi->TXD = *data++;
twi->TASKS_STARTTX = 1;
twi->TXD = *data++;
twi->TASKS_STARTTX = 1;
/** @snippet [TWI HW master write] */
while (true)
{
while (twi->EVENTS_TXDSENT == 0 && twi->EVENTS_ERROR == 0 && (--timeout))
while (twi->EVENTS_TXDSENT == 0 && twi->EVENTS_ERROR == 0 && (--timeout))
{
// Do nothing.
}
@ -47,33 +47,33 @@ static bool twi_master_write(uint8_t * data, uint8_t data_length, bool issue_sto
// 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
twi->EVENTS_ERROR = 0;
twi->ENABLE = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos;
twi->POWER = 0;
twi->EVENTS_ERROR = 0;
twi->ENABLE = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos;
twi->POWER = 0;
nrf_delay_us(5);
twi->POWER = 1;
twi->ENABLE = TWI_ENABLE_ENABLE_Enabled << TWI_ENABLE_ENABLE_Pos;
twi->POWER = 1;
twi->ENABLE = TWI_ENABLE_ENABLE_Enabled << TWI_ENABLE_ENABLE_Pos;
(void)twi_master_init_and_clear(twi);
(void)twi_master_init_and_clear(twi);
return false;
}
twi->EVENTS_TXDSENT = 0;
twi->EVENTS_TXDSENT = 0;
if (--data_length == 0)
{
break;
}
twi->TXD = *data++;
twi->TXD = *data++;
}
/** @snippet [TWI HW master write] */
if (issue_stop_condition)
{
twi->EVENTS_STOPPED = 0;
twi->TASKS_STOP = 1;
twi->EVENTS_STOPPED = 0;
twi->TASKS_STOP = 1;
/* Wait until stop sequence is sent */
while(twi->EVENTS_STOPPED == 0)
while(twi->EVENTS_STOPPED == 0)
{
// Do nothing.
}
@ -95,39 +95,39 @@ static bool twi_master_read(uint8_t * data, uint8_t data_length, bool issue_stop
}
else if (data_length == 1)
{
NRF_PPI->CH[0].TEP = (uint32_t)&twi->TASKS_STOP;
NRF_PPI->CH[0].TEP = (uint32_t)&twi->TASKS_STOP;
}
else
{
NRF_PPI->CH[0].TEP = (uint32_t)&twi->TASKS_SUSPEND;
NRF_PPI->CH[0].TEP = (uint32_t)&twi->TASKS_SUSPEND;
}
NRF_PPI->CHENSET = PPI_CHENSET_CH0_Msk;
twi->EVENTS_RXDREADY = 0;
twi->TASKS_STARTRX = 1;
twi->EVENTS_RXDREADY = 0;
twi->TASKS_STARTRX = 1;
/** @snippet [TWI HW master read] */
while (true)
{
while (twi->EVENTS_RXDREADY == 0 && NRF_TWI1->EVENTS_ERROR == 0 && (--timeout))
while (twi->EVENTS_RXDREADY == 0 && NRF_TWI1->EVENTS_ERROR == 0 && (--timeout))
{
// Do nothing.
}
twi->EVENTS_RXDREADY = 0;
twi->EVENTS_RXDREADY = 0;
if (timeout == 0 || twi->EVENTS_ERROR != 0)
if (timeout == 0 || twi->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
twi->EVENTS_ERROR = 0;
twi->ENABLE = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos;
twi->POWER = 0;
twi->EVENTS_ERROR = 0;
twi->ENABLE = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos;
twi->POWER = 0;
nrf_delay_us(5);
twi->POWER = 1;
twi->ENABLE = TWI_ENABLE_ENABLE_Enabled << TWI_ENABLE_ENABLE_Pos;
twi->POWER = 1;
twi->ENABLE = TWI_ENABLE_ENABLE_Enabled << TWI_ENABLE_ENABLE_Pos;
(void)twi_master_init_and_clear(twi);
(void)twi_master_init_and_clear(twi);
return false;
}
@ -149,16 +149,16 @@ static bool twi_master_read(uint8_t * data, uint8_t data_length, bool issue_stop
// Product Anomaly Notification document found at
// https://www.nordicsemi.com/eng/Products/Bluetooth-R-low-energy/nRF51822/#Downloads
nrf_delay_us(20);
twi->TASKS_RESUME = 1;
twi->TASKS_RESUME = 1;
}
/** @snippet [TWI HW master read] */
/* Wait until stop sequence is sent */
while(twi->EVENTS_STOPPED == 0)
while(twi->EVENTS_STOPPED == 0)
{
// Do nothing.
}
twi->EVENTS_STOPPED = 0;
twi->EVENTS_STOPPED = 0;
NRF_PPI->CHENCLR = PPI_CHENCLR_CH0_Msk;
return true;
@ -180,8 +180,8 @@ static bool twi_master_clear_bus(NRF_TWI_Type* twi)
uint32_t data_pin_config;
// Save and disable TWI hardware so software can take control over the pins.
twi_state = twi->ENABLE;
twi->ENABLE = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos;
twi_state = twi->ENABLE;
twi->ENABLE = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos;
clk_pin_config = \
NRF_GPIO->PIN_CNF[TWI_MASTER_CONFIG_CLOCK_PIN_NUMBER];
@ -234,7 +234,7 @@ static bool twi_master_clear_bus(NRF_TWI_Type* twi)
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;
twi->ENABLE = twi_state;
twi->ENABLE = twi_state;
return bus_clear;
}
@ -262,17 +262,17 @@ bool twi_master_init_and_clear(NRF_TWI_Type* twi)
| (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) \
| (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
twi->EVENTS_RXDREADY = 0;
twi->EVENTS_TXDSENT = 0;
twi->PSELSCL = TWI_MASTER_CONFIG_CLOCK_PIN_NUMBER;
twi->PSELSDA = TWI_MASTER_CONFIG_DATA_PIN_NUMBER;
twi->FREQUENCY = TWI_FREQUENCY_FREQUENCY_K100 << TWI_FREQUENCY_FREQUENCY_Pos;
NRF_PPI->CH[0].EEP = (uint32_t)&twi->EVENTS_BB;
NRF_PPI->CH[0].TEP = (uint32_t)&twi->TASKS_SUSPEND;
twi->EVENTS_RXDREADY = 0;
twi->EVENTS_TXDSENT = 0;
twi->PSELSCL = TWI_MASTER_CONFIG_CLOCK_PIN_NUMBER;
twi->PSELSDA = TWI_MASTER_CONFIG_DATA_PIN_NUMBER;
twi->FREQUENCY = TWI_FREQUENCY_FREQUENCY_K100 << TWI_FREQUENCY_FREQUENCY_Pos;
NRF_PPI->CH[0].EEP = (uint32_t)&twi->EVENTS_BB;
NRF_PPI->CH[0].TEP = (uint32_t)&twi->TASKS_SUSPEND;
NRF_PPI->CHENCLR = PPI_CHENCLR_CH0_Msk;
twi->ENABLE = TWI_ENABLE_ENABLE_Enabled << TWI_ENABLE_ENABLE_Pos;
twi->ENABLE = TWI_ENABLE_ENABLE_Enabled << TWI_ENABLE_ENABLE_Pos;
return twi_master_clear_bus(twi);
return twi_master_clear_bus(twi);
}
@ -281,21 +281,21 @@ bool twi_master_init_and_clear(NRF_TWI_Type* twi)
bool twi_master_transfer(uint8_t address,
uint8_t * data,
uint8_t data_length,
bool issue_stop_condition,
NRF_TWI_Type* twi)
bool issue_stop_condition,
NRF_TWI_Type* twi)
{
bool transfer_succeeded = false;
if (data_length > 0 && twi_master_clear_bus(twi))
if (data_length > 0 && twi_master_clear_bus(twi))
{
twi->ADDRESS = (address >> 1);
twi->ADDRESS = (address >> 1);
if ((address & TWI_READ_BIT))
if ((address & TWI_READ_BIT))
{
transfer_succeeded = twi_master_read(data, data_length, issue_stop_condition, twi);
transfer_succeeded = twi_master_read(data, data_length, issue_stop_condition, twi);
}
else
{
transfer_succeeded = twi_master_write(data, data_length, issue_stop_condition, twi);
transfer_succeeded = twi_master_write(data, data_length, issue_stop_condition, twi);
}
}
return transfer_succeeded;