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| 1 | void sendSerial() {
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| 2 | ||
| 3 | uint32_t nBitsSent = 0; | |
| 4 | ||
| 5 | /* Padding: we need to pre-pad | |
| 6 | We will send 15 12-bit values (180 bits) which is 22.5 8-bit SPI 8-bit bytes | |
| 7 | For every TLC5490 we actually need to send 16 12-bit values (192 bits in total) | |
| 8 | because that's what the TLC5490 serial comms expect. | |
| 9 | Since we are using only 15 of the output lines, | |
| 10 | the 16th value is unnecessary (we are not using OUT15) | |
| 11 | We also need to pad for the extra nibble (22.5 SPI above) | |
| 12 | So if we start by sending the empty 12-bit value, we are OK | |
| 13 | This padding needs to be done for every chip | |
| 14 | */ | |
| 15 | //~ padSPI(0); | |
| 16 | SPDR = 0; // First 8 bits of the empty 12-bit data | |
| 17 | while(!(SPSR & (1<<SPIF))) {
| |
| 18 | // Wait for the transfer to finish | |
| 19 | } | |
| 20 | SPDR = 0; // Last 4 bits of the empty 12-bit data | |
| 21 | // plus the empty 4 high bits of the first intensity data | |
| 22 | while(!(SPSR & (1<<SPIF))) {
| |
| 23 | // Wait for the transfer to finish | |
| 24 | } | |
| 25 | nBitsSent += 16; | |
| 26 | uint8_t idxNextSendType = 2; // The next send type is type 2 | |
| 27 | // so we indicate that | |
| 28 | ||
| 29 | // Different curColDatas are not implemented yet | |
| 30 | //~ uint8_t * curColData = nColumnData[idxUnit]; | |
| 31 | ||
| 32 | uint8_t idxChannel = 0; | |
| 33 | uint8_t nPixelsSent = 0; | |
| 34 | uint8_t dataByte = (idxChannel==0)?0xFF:0x00; | |
| 35 | uint8_t toSPDR = dataByte; | |
| 36 | ||
| 37 | for (;;) { // Send bytes loop
| |
| 38 | SPDR = toSPDR; // Send the byte | |
| 39 | nBitsSent += 8; | |
| 40 | ||
| 41 | while(!(SPSR & (1<<SPIF))) {
| |
| 42 | // Wait for the transfer to finish | |
| 43 | } | |
| 44 | ||
| 45 | #define PADDING | |
| 46 | #ifdef PADDING | |
| 47 | if (nBitsSent % 192 == 0) {
| |
| 48 | if (nBitsSent >= 192 *3) | |
| 49 | break; | |
| 50 | ||
| 51 | ||
| 52 | SPDR = 0; // First 8 bits of the empty 12-bit data | |
| 53 | while(!(SPSR & (1<<SPIF))) {
| |
| 54 | // Wait for the transfer to finish | |
| 55 | } | |
| 56 | SPDR = 0; // Last 4 bits of the empty 12-bit data | |
| 57 | // plus the empty 4 high bits of the first intensity data | |
| 58 | while(!(SPSR & (1<<SPIF))) {
| |
| 59 | // Wait for the transfer to finish | |
| 60 | } | |
| 61 | idxNextSendType = 1; // It will get incremented first | |
| 62 | // so the first byte will actually be | |
| 63 | // idxNextSendType = 2 | |
| 64 | ||
| 65 | nBitsSent += 16; | |
| 66 | } | |
| 67 | #endif | |
| 68 | ||
| 69 | // Update the send type | |
| 70 | if (++idxNextSendType>2) { idxNextSendType = 0; }
| |
| 71 | //~ ++idxNextSendType %= 4; | |
| 72 | ||
| 73 | // Prepare the next one for loading | |
| 74 | if (idxNextSendType==1) {
| |
| 75 | // Case 1: Need to send the low nibble + padding | |
| 76 | toSPDR = dataByte<<4; | |
| 77 | } else {
| |
| 78 | // Either way we need another new data in dataByte | |
| 79 | // | |
| 80 | if (idxChannel==0) {
| |
| 81 | // Load next palette index | |
| 82 | nPixelsSent++; | |
| 83 | } | |
| 84 | dataByte = (idxChannel==0)?0xFF:0x00; | |
| 85 | ||
| 86 | if (++idxChannel>2) idxChannel = 0; | |
| 87 | //~ This fails: ++idxChannel %= 3; | |
| 88 | ||
| 89 | if (idxNextSendType) {
| |
| 90 | // idxSendType == 2 | |
| 91 | // Case 2: Need to send pure data | |
| 92 | toSPDR = dataByte; | |
| 93 | } else {
| |
| 94 | // idxSendType == 0 | |
| 95 | // Case 0: Need to send padding + high nibble | |
| 96 | toSPDR = dataByte >> 4; | |
| 97 | } | |
| 98 | } | |
| 99 | ||
| 100 | while(!(SPSR & (1<<SPIF))) // Wait for the transfer to finish | |
| 101 | ; | |
| 102 | ||
| 103 | - | } // End of send bytes loop |
| 103 | + | } // End of send bytes loop |
| 104 | } |
