| Line 50... |
Line 50... |
*
|
*
|
* @return 0 if TWI was not synthesized, 1 if TWI is available.
|
* @return 0 if TWI was not synthesized, 1 if TWI is available.
|
**************************************************************************/
|
**************************************************************************/
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int neorv32_twi_available(void) {
|
int neorv32_twi_available(void) {
|
|
|
if (SYSINFO_FEATURES & (1 << SYSINFO_FEATURES_IO_TWI)) {
|
if (NEORV32_SYSINFO.SOC & (1 << SYSINFO_SOC_IO_TWI)) {
|
return 1;
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return 1;
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}
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}
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else {
|
else {
|
return 0;
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return 0;
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}
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}
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}
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}
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/**********************************************************************//**
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/**********************************************************************//**
|
* Enable and configure TWI controller. The TWI control register bits are listed in #NEORV32_TWI_CT_enum.
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* Enable and configure TWI controller. The TWI control register bits are listed in #NEORV32_TWI_CTRL_enum.
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*
|
*
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* @param[in] prsc Clock prescaler select (0..7). See #NEORV32_CLOCK_PRSC_enum.
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* @param[in] prsc Clock prescaler select (0..7). See #NEORV32_CLOCK_PRSC_enum.
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* @param[in] ckst_en Enable clock-stretching by peripherals when 1.
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* @param[in] ckst_en Enable clock-stretching by peripherals when 1.
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**************************************************************************/
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**************************************************************************/
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void neorv32_twi_setup(uint8_t prsc, uint8_t ckst_en) {
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void neorv32_twi_setup(uint8_t prsc, uint8_t ckst_en) {
|
|
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TWI_CT = 0; // reset
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NEORV32_TWI.CTRL = 0; // reset
|
|
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uint32_t ct_enable = 1;
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uint32_t ct_enable = 1;
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ct_enable = ct_enable << TWI_CT_EN;
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ct_enable = ct_enable << TWI_CTRL_EN;
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|
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uint32_t ct_prsc = (uint32_t)(prsc & 0x07);
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uint32_t ct_prsc = (uint32_t)(prsc & 0x07);
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ct_prsc = ct_prsc << TWI_CT_PRSC0;
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ct_prsc = ct_prsc << TWI_CTRL_PRSC0;
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|
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uint32_t ct_cksten = (uint32_t)(ckst_en & 0x01);
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uint32_t ct_cksten = (uint32_t)(ckst_en & 0x01);
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ct_cksten = ct_cksten << TWI_CT_CKSTEN;
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ct_cksten = ct_cksten << TWI_CTRL_CKSTEN;
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|
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TWI_CT = ct_enable | ct_prsc | ct_cksten;
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NEORV32_TWI.CTRL = ct_enable | ct_prsc | ct_cksten;
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}
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}
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|
|
|
|
/**********************************************************************//**
|
/**********************************************************************//**
|
* Disable TWI controller.
|
* Disable TWI controller.
|
**************************************************************************/
|
**************************************************************************/
|
void neorv32_twi_disable(void) {
|
void neorv32_twi_disable(void) {
|
|
|
TWI_CT &= ~((uint32_t)(1 << TWI_CT_EN));
|
NEORV32_TWI.CTRL &= ~((uint32_t)(1 << TWI_CTRL_EN));
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}
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}
|
|
|
|
|
/**********************************************************************//**
|
/**********************************************************************//**
|
* Enable TWI controller.
|
* Enable TWI controller.
|
**************************************************************************/
|
**************************************************************************/
|
void neorv32_twi_enable(void) {
|
void neorv32_twi_enable(void) {
|
|
|
TWI_CT |= (uint32_t)(1 << TWI_CT_EN);
|
NEORV32_TWI.CTRL |= (uint32_t)(1 << TWI_CTRL_EN);
|
}
|
}
|
|
|
|
|
/**********************************************************************//**
|
/**********************************************************************//**
|
* Activate sending ACKs by controller (MACK).
|
* Activate sending ACKs by controller (MACK).
|
**************************************************************************/
|
**************************************************************************/
|
void neorv32_twi_mack_enable(void) {
|
void neorv32_twi_mack_enable(void) {
|
|
|
TWI_CT |= ((uint32_t)(1 << TWI_CT_MACK));
|
NEORV32_TWI.CTRL |= ((uint32_t)(1 << TWI_CTRL_MACK));
|
}
|
}
|
|
|
|
|
/**********************************************************************//**
|
/**********************************************************************//**
|
* Deacivate sending ACKs by controller (MACK).
|
* Deacivate sending ACKs by controller (MACK).
|
**************************************************************************/
|
**************************************************************************/
|
void neorv32_twi_mack_disable(void) {
|
void neorv32_twi_mack_disable(void) {
|
|
|
TWI_CT &= ~((uint32_t)(1 << TWI_CT_MACK));
|
NEORV32_TWI.CTRL &= ~((uint32_t)(1 << TWI_CTRL_MACK));
|
}
|
}
|
|
|
|
|
/**********************************************************************//**
|
/**********************************************************************//**
|
* Check if TWI is busy.
|
* Check if TWI is busy.
|
| Line 127... |
Line 127... |
*
|
*
|
* @return 0 if idle, 1 if busy
|
* @return 0 if idle, 1 if busy
|
**************************************************************************/
|
**************************************************************************/
|
int neorv32_twi_busy(void) {
|
int neorv32_twi_busy(void) {
|
|
|
if (TWI_CT & (1 << TWI_CT_BUSY)) {
|
if (NEORV32_TWI.CTRL & (1 << TWI_CTRL_BUSY)) {
|
return 1;
|
return 1;
|
}
|
}
|
return 0;
|
return 0;
|
}
|
}
|
|
|
| Line 146... |
Line 146... |
**************************************************************************/
|
**************************************************************************/
|
int neorv32_twi_start_trans(uint8_t a) {
|
int neorv32_twi_start_trans(uint8_t a) {
|
|
|
neorv32_twi_generate_start(); // generate START condition
|
neorv32_twi_generate_start(); // generate START condition
|
|
|
TWI_DATA = (uint32_t)a; // send address
|
NEORV32_TWI.DATA = (uint32_t)a; // send address
|
while(TWI_CT & (1 << TWI_CT_BUSY)); // wait until idle again
|
while(NEORV32_TWI.CTRL & (1 << TWI_CTRL_BUSY)); // wait until idle again
|
|
|
// check for ACK/NACK
|
// check for ACK/NACK
|
if (TWI_CT & (1 << TWI_CT_ACK))
|
if (NEORV32_TWI.CTRL & (1 << TWI_CTRL_ACK))
|
return 0; // ACK received
|
return 0; // ACK received
|
else
|
else
|
return 1; // NACK received
|
return 1; // NACK received
|
}
|
}
|
|
|
| Line 167... |
Line 167... |
* @param[in] d Data byte to be send.
|
* @param[in] d Data byte to be send.
|
* @return 0: ACK received, 1: NACK received.
|
* @return 0: ACK received, 1: NACK received.
|
**************************************************************************/
|
**************************************************************************/
|
int neorv32_twi_trans(uint8_t d) {
|
int neorv32_twi_trans(uint8_t d) {
|
|
|
TWI_DATA = (uint32_t)d; // send data
|
NEORV32_TWI.DATA = (uint32_t)d; // send data
|
while(TWI_CT & (1 << TWI_CT_BUSY)); // wait until idle again
|
while(NEORV32_TWI.CTRL & (1 << TWI_CTRL_BUSY)); // wait until idle again
|
|
|
// check for ACK/NACK
|
// check for ACK/NACK
|
if (TWI_CT & (1 << TWI_CT_ACK))
|
if (NEORV32_TWI.CTRL & (1 << TWI_CTRL_ACK))
|
return 0; // ACK received
|
return 0; // ACK received
|
else
|
else
|
return 1; // NACK received
|
return 1; // NACK received
|
}
|
}
|
|
|
| Line 185... |
Line 185... |
*
|
*
|
* @return 0: Last received data byte.
|
* @return 0: Last received data byte.
|
**************************************************************************/
|
**************************************************************************/
|
uint8_t neorv32_twi_get_data(void) {
|
uint8_t neorv32_twi_get_data(void) {
|
|
|
return (uint8_t)TWI_DATA; // get RX data from previous transmission
|
return (uint8_t)NEORV32_TWI.DATA; // get RX data from previous transmission
|
}
|
}
|
|
|
|
|
/**********************************************************************//**
|
/**********************************************************************//**
|
* Generate STOP condition.
|
* Generate STOP condition.
|
*
|
*
|
* @note Blocking function.
|
* @note Blocking function.
|
**************************************************************************/
|
**************************************************************************/
|
void neorv32_twi_generate_stop(void) {
|
void neorv32_twi_generate_stop(void) {
|
|
|
TWI_CT |= (uint32_t)(1 << TWI_CT_STOP); // generate STOP condition
|
NEORV32_TWI.CTRL |= (uint32_t)(1 << TWI_CTRL_STOP); // generate STOP condition
|
while(TWI_CT & (1 << TWI_CT_BUSY)); // wait until idle again
|
while(NEORV32_TWI.CTRL & (1 << TWI_CTRL_BUSY)); // wait until idle again
|
}
|
}
|
|
|
|
|
/**********************************************************************//**
|
/**********************************************************************//**
|
* Generate START condition.
|
* Generate START condition.
|
*
|
*
|
* @note Blocking function.
|
* @note Blocking function.
|
**************************************************************************/
|
**************************************************************************/
|
void neorv32_twi_generate_start(void) {
|
void neorv32_twi_generate_start(void) {
|
|
|
TWI_CT |= (1 << TWI_CT_START); // generate START condition
|
NEORV32_TWI.CTRL |= (1 << TWI_CTRL_START); // generate START condition
|
while(TWI_CT & (1 << TWI_CT_BUSY)); // wait until idle again
|
while(NEORV32_TWI.CTRL & (1 << TWI_CTRL_BUSY)); // wait until idle again
|
}
|
}
|
|
|
No newline at end of file
|
No newline at end of file
|
