s this possible do LIN with NRF5340 (uart) hardware and software wise
s this possible do LIN with NRF5340 (uart) hardware and software wise
Here are a couple of replies I made which include using PWM for Tx:
Here's a 2-byte 10-bit frame; any number of bits can be used simply by changing the table:
// Example using grouped, note uses pin channels 0 and 2 not 0 and 1
nrf_pwm_values_grouped_t halfDuplexUartMsg[] = {
// Index Normal pin 0 Inverted pin 2
// ===== =================== ==============
{ /* 0:0 */ 0x8000|(BIT_LOW), (BIT_LOW), }, // Start bit
{ /* 0:1 */ 0x8000|(STX_BIT_0), (STX_BIT_0) },
{ /* 0:2 */ 0x8000|(STX_BIT_1), (STX_BIT_1) },
{ /* 0:3 */ 0x8000|(STX_BIT_2), (STX_BIT_2) },
{ /* 0:4 */ 0x8000|(STX_BIT_3), (STX_BIT_3) },
{ /* 0:5 */ 0x8000|(STX_BIT_4), (STX_BIT_4) },
{ /* 0:6 */ 0x8000|(STX_BIT_5), (STX_BIT_5) },
{ /* 0:7 */ 0x8000|(STX_BIT_6), (STX_BIT_6) },
{ /* 0:8 */ 0x8000|(STX_BIT_7), (STX_BIT_7) },
{ /* 0:9 */ 0x8000|(BIT_HIGH), (BIT_HIGH), }, // Stop bit 1
{ /* 1:0 */ 0x8000|(BIT_LOW), (BIT_LOW), }, // Start bit
{ /* 1:1 */ 0x8000|(ETX_BIT_0), (ETX_BIT_0) },
{ /* 1:2 */ 0x8000|(ETX_BIT_1), (ETX_BIT_1) },
{ /* 1:3 */ 0x8000|(ETX_BIT_2), (ETX_BIT_2) },
{ /* 1:4 */ 0x8000|(ETX_BIT_3), (ETX_BIT_3) },
{ /* 1:5 */ 0x8000|(ETX_BIT_4), (ETX_BIT_4) },
{ /* 1:6 */ 0x8000|(ETX_BIT_5), (ETX_BIT_5) },
{ /* 1:7 */ 0x8000|(ETX_BIT_6), (ETX_BIT_6) },
{ /* 1:8 */ 0x8000|(ETX_BIT_7), (ETX_BIT_7) },
{ /* 1:9 */ 0x8000|(BIT_HIGH), (BIT_HIGH), }, // Stop bit 1
};
Sample encoding, normal or Manchester:
#define BIT_LOW 0 // Normal encoding #define BIT_HIGH (COUNTER_TOP) // Normal encoding //#define BIT_LOW ((2*COUNTER_TOP)/3) // Manchester encoding 2/3 bit //#define BIT_HIGH (COUNTER_TOP/3) // Manchester encoding 1/3 bit #define PWM_NEG (PIN_FEATHER_D6) // Low level outside transmission #define PWM_POS (PIN_FEATHER_D9) // High level outside transmission #define STX_BYTE 0x02 // Example start character: STX (^B) #define ETX_BYTE 0x03 // Example start character: ETX (^C) // Example STX byte in little-endian format #define STX_BIT_0 (((STX_BYTE>>0) & 0x01) ? BIT_HIGH : BIT_LOW) #define STX_BIT_1 (((STX_BYTE>>1) & 0x01) ? BIT_HIGH : BIT_LOW) #define STX_BIT_2 (((STX_BYTE>>2) & 0x01) ? BIT_HIGH : BIT_LOW) #define STX_BIT_3 (((STX_BYTE>>3) & 0x01) ? BIT_HIGH : BIT_LOW) #define STX_BIT_4 (((STX_BYTE>>4) & 0x01) ? BIT_HIGH : BIT_LOW) #define STX_BIT_5 (((STX_BYTE>>5) & 0x01) ? BIT_HIGH : BIT_LOW) #define STX_BIT_6 (((STX_BYTE>>6) & 0x01) ? BIT_HIGH : BIT_LOW) #define STX_BIT_7 (((STX_BYTE>>7) & 0x01) ? BIT_HIGH : BIT_LOW) // Example ETX byte in little-endian format #define ETX_BIT_0 (((ETX_BYTE>>0) & 0x01) ? BIT_HIGH : BIT_LOW) #define ETX_BIT_1 (((ETX_BYTE>>1) & 0x01) ? BIT_HIGH : BIT_LOW) #define ETX_BIT_2 (((ETX_BYTE>>2) & 0x01) ? BIT_HIGH : BIT_LOW) #define ETX_BIT_3 (((ETX_BYTE>>3) & 0x01) ? BIT_HIGH : BIT_LOW) #define ETX_BIT_4 (((ETX_BYTE>>4) & 0x01) ? BIT_HIGH : BIT_LOW) #define ETX_BIT_5 (((ETX_BYTE>>5) & 0x01) ? BIT_HIGH : BIT_LOW) #define ETX_BIT_6 (((ETX_BYTE>>6) & 0x01) ? BIT_HIGH : BIT_LOW) #define ETX_BIT_7 (((ETX_BYTE>>7) & 0x01) ? BIT_HIGH : BIT_LOW)