Revision 240c122b
Implemented tiny-twi reading
| scout_avr/bom/tiny-twi.c | ||
|---|---|---|
| 24 | 24 |
uint8_t recv_idx; |
| 25 | 25 |
uint8_t recv_data[RECV_BUF_SIZE]; |
| 26 | 26 |
slave_rx_t onDataRecieved; |
| 27 |
uint8_t temp; |
|
| 27 | 28 |
|
| 28 | 29 |
static void twi_set_ctr(char n) {
|
| 29 | 30 |
USISR = n; |
| ... | ... | |
| 69 | 70 |
state = is_read? SEND_READ_ACK : SEND_WRITE_ACK; |
| 70 | 71 |
} |
| 71 | 72 |
|
| 73 |
static void twi_send_data() {
|
|
| 74 |
twi_set_ctr(0); |
|
| 75 |
// TODO set USIDR from buffer |
|
| 76 |
USIDR = ++temp; |
|
| 77 |
DDRB |= _BV(SDA); |
|
| 78 |
state = SEND_DATA; |
|
| 79 |
} |
|
| 80 |
|
|
| 81 |
static void twi_recv_ack() {
|
|
| 82 |
twi_set_ctr(14); |
|
| 83 |
DDRB &= ~_BV(SDA); |
|
| 84 |
state = RECV_ACK; |
|
| 85 |
} |
|
| 86 |
|
|
| 72 | 87 |
ISR(USI_START_vect) {
|
| 73 | 88 |
twi_start(); |
| 74 | 89 |
} |
| ... | ... | |
| 109 | 124 |
break; |
| 110 | 125 |
|
| 111 | 126 |
case SEND_READ_ACK: |
| 112 |
DDRB &= ~_BV(SDA); |
|
| 113 |
// TODO write to USIDR |
|
| 114 |
state = SEND_DATA; |
|
| 127 |
twi_send_data(); |
|
| 115 | 128 |
break; |
| 116 | 129 |
|
| 117 | 130 |
case SEND_DATA: |
| 131 |
twi_recv_ack(); |
|
| 118 | 132 |
break; |
| 119 | 133 |
|
| 120 | 134 |
case RECV_ACK: |
| 135 |
if (input & 1) {
|
|
| 136 |
// received nak |
|
| 137 |
twi_ready(); |
|
| 138 |
} else {
|
|
| 139 |
// received ack |
|
| 140 |
twi_send_data(); |
|
| 141 |
} |
|
| 121 | 142 |
break; |
| 122 | 143 |
} |
| 123 | 144 |
USISR = _BV(USIOIF) | (USISR & 0xF); |
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