Add SPI bitwidths to ST targets where supported

Author: pea-pod

targets/TARGET_STM/stm_spi_api.c

@@ -90,7 +90,19 @@ void spi_get_capabilities(PinName ssel, bool slave, spi_capabilities_t *cap)
     } else {
         cap->minimum_frequency = 200000;          // 200 kHz
         cap->maximum_frequency = 2000000;         // 2 MHz
+#if defined(TARGET_STM32F0) || defined(TARGET_STM32F3) || defined(TARGET_STM32F7) || \
+    defined(TARGET_STM32G0) || defined(TARGET_STM32G4) || defined(TARGET_STM32L4) || \
+    defined(TARGET_STM32L5) || defined(TARGET_STM32WB)
+        cap->word_length = 0x0000FFF8;            // 4 through 16 bit symbols, inclusive
+#elif defined(TARGET_STM32H7)
+        cap->word_length = 0xFFFFFFF8;            // 4 through 32 bit symbols, inclusive
+#elif defined(TARGET_STM32F1) || defined(TARGET_STM32F2) || defined(TARGET_STM32F4) || \
+    defined(TARGET_STM32L0) || defined(TARGET_STM32L1)
         cap->word_length = 0x00008080;            // 8 and 16 bit symbols
+#else
+#error No valid target for this. Update in the appropriate portion above.
+#endif
+
         cap->support_slave_mode = false;          // to be determined later based on ssel
         cap->hw_cs_handle = false;                // to be determined later based on ssel
         cap->slave_delay_between_symbols_ns = 0;  // irrelevant in master mode
@@ -384,7 +396,108 @@ void spi_format(spi_t *obj, int bits, int mode, int slave)
     DEBUG_PRINTF("spi_format, bits:%d, mode:%d, slave?:%d\r\n", bits, mode, slave);
 
     // Save new values
-    handle->Init.DataSize          = (bits == 16) ? SPI_DATASIZE_16BIT : SPI_DATASIZE_8BIT;
+    uint32_t DataSize;
+    switch (bits) {
+#if defined(TARGET_STM32F0) || defined(TARGET_STM32F3) || defined(TARGET_STM32F7) || \
+    defined(TARGET_STM32G0) || defined(TARGET_STM32G4) || defined(TARGET_STM32L4) || \
+    defined(TARGET_STM32L5) || defined(TARGET_STM32WB) || defined(TARGET_STM32H7)
+        case 4:
+            DataSize = SPI_DATASIZE_4BIT;
+            break;
+        case 5:
+            DataSize = SPI_DATASIZE_5BIT;
+            break;
+        case 6:
+            DataSize = SPI_DATASIZE_6BIT;
+            break;
+        case 7:
+            DataSize = SPI_DATASIZE_7BIT;
+            break;
+        case 9:
+            DataSize = SPI_DATASIZE_9BIT;
+            break;
+        case 10:
+            DataSize = SPI_DATASIZE_10BIT;
+            break;
+        case 11:
+            DataSize = SPI_DATASIZE_11BIT;
+            break;
+        case 12:
+            DataSize = SPI_DATASIZE_12BIT;
+            break;
+        case 13:
+            DataSize = SPI_DATASIZE_13BIT;
+            break;
+        case 14:
+            DataSize = SPI_DATASIZE_14BIT;
+            break;
+        case 15:
+            DataSize = SPI_DATASIZE_15BIT;
+            break;
+#if defined(TARGET_STM32H7)
+        case 17:
+            DataSize = SPI_DATASIZE_17BIT;
+            break;
+        case 18:
+            DataSize = SPI_DATASIZE_18BIT;
+            break;
+        case 19:
+            DataSize = SPI_DATASIZE_19BIT;
+            break;
+        case 20:
+            DataSize = SPI_DATASIZE_20BIT;
+            break;
+        case 21:
+            DataSize = SPI_DATASIZE_21BIT;
+            break;
+        case 22:
+            DataSize = SPI_DATASIZE_22BIT;
+            break;
+        case 23:
+            DataSize = SPI_DATASIZE_23BIT;
+            break;
+        case 24:
+            DataSize = SPI_DATASIZE_24BIT;
+            break;
+        case 25:
+            DataSize = SPI_DATASIZE_25BIT;
+            break;
+        case 26:
+            DataSize = SPI_DATASIZE_26BIT;
+            break;
+        case 27:
+            DataSize = SPI_DATASIZE_27BIT;
+            break;
+        case 28:
+            DataSize = SPI_DATASIZE_28BIT;
+            break;
+        case 29:
+            DataSize = SPI_DATASIZE_29BIT;
+            break;
+        case 30:
+            DataSize = SPI_DATASIZE_30BIT;
+            break;
+        case 31:
+            DataSize = SPI_DATASIZE_31BIT;
+            break;
+        case 32:
+            DataSize = SPI_DATASIZE_32BIT;
+            break;
+#endif
+#elif !defined(TARGET_STM32F1) && !defined(TARGET_STM32F2) && !defined(TARGET_STM32F4) && \
+    !defined(TARGET_STM32L0) && defined(TARGET_STM32L1)
+#error No valid target for this. Update in the appropriate portion above.
+#endif
+        case 16:
+            DataSize = SPI_DATASIZE_16BIT;
+            break;
+        // 8 bits is the default for anything not found before
+        default:
+            DataSize = SPI_DATASIZE_8BIT;
+            break;
+    }
+
+    handle->Init.DataSize = DataSize;
 
     switch (mode) {
         case 0: