sam4e8e: Add the SAM4e8e port

This can be flashed to e.g. the duet wifi using bossac. It requires a
later version as is currently included in the klipper repo (1.8
vs. 1.2). Comms are currently via UART0 only, USB serial is still TBD

Signed-off-by: Florian Heilmann <Florian.Heilmann@gmx.net>

4 files changed, 73 insertions, 4 deletions

diff --git a/lib/README b/lib/README
index 5976b7cc..c785c7de 100644
--- a/lib/README
+++ b/lib/README
@@ -25,6 +25,14 @@ version 1.3.304 (extracted on 20180725). It has been modified to
 compile with gcc's LTO feature and to work with chips that have a
 bootloader. See samd21.patch for the modifications.
 
+The cmsis-sam4e8e directory contains code from the 
+Atmel.SAM4E_DFP.1.1.57.atpack zip file found at:
+  http://packs.download.atmel.com/
+version 1.1.57 (extracted on 20180806). It has been modified to compile
+with gcc's LTO feature. Also, some AFEC register RW accesses have been modified
+to comply with the SAM4E datasheet. Finally, the interrupt vector table has
+been slightly modified to allow the code to run. See cmsis-sam4e8e.patch for the modifications.
+
 The lpc176x directory contains code from the mbed project:
   https://github.com/ARMmbed/mbed-os
 version mbed-os-5.8.3 (c05d72c3c005fbb7e92c3994c32bda45218ae7fe).
diff --git a/lib/cmsis-sam4e/cmsis-sam4e.patch b/lib/cmsis-sam4e/cmsis-sam4e.patch
new file mode 100644
index 00000000..f69edfb2
--- /dev/null
+++ b/lib/cmsis-sam4e/cmsis-sam4e.patch
@@ -0,0 +1,56 @@
+--- a/lib/cmsis-sam4e/gcc/gcc/startup_sam4e.c
++++ b/lib/cmsis-sam4e/gcc/gcc/startup_sam4e.c
+@@ -104,7 +105,7 @@ void GMAC_Handler   ( void ) __attribute__ ((weak, alias("Dummy_Handler")));
+ void UART1_Handler  ( void ) __attribute__ ((weak, alias("Dummy_Handler")));
+
+ /* Exception Table */
+-__attribute__ ((section(".vectors")))
++__attribute__ ((section(".vectors"))) __attribute__((externally_visible))
+ const DeviceVectors exception_table = {
+
+         /* Configure Initial Stack Pointer, using linker-generated symbols */
+@@ -135,6 +136,7 @@ const DeviceVectors exception_table = {
+         (void*) PMC_Handler,    /* 5  Power Management Controller */
+         (void*) EFC_Handler,    /* 6  Enhanced Embedded Flash Controller */
+         (void*) UART0_Handler,  /* 7  UART 0 */
++        (void*) Dummy_Handler,  /* 8  Dummy */
+         (void*) PIOA_Handler,   /* 9  Parallel I/O Controller A */
+         (void*) PIOB_Handler,   /* 10 Parallel I/O Controller B */
+         (void*) PIOC_Handler,   /* 11 Parallel I/O Controller C */
+@@ -166,6 +168,10 @@ const DeviceVectors exception_table = {
+         (void*) CAN0_Handler,   /* 37 CAN0 */
+         (void*) CAN1_Handler,   /* 38 CAN1 */
+         (void*) AES_Handler,    /* 39 AES */
++        (void*) Dummy_Handler,  /* 40 Dummy */
++        (void*) Dummy_Handler,  /* 41 Dummy */
++        (void*) Dummy_Handler,  /* 42 Dummy */
++        (void*) Dummy_Handler,  /* 43 Dummy */
+         (void*) GMAC_Handler,   /* 44 EMAC */
+         (void*) UART1_Handler   /* 45 UART */
+ };
+@@ -198,7 +204,7 @@ void Reset_Handler(void)
+         SCB->VTOR = ((uint32_t) pSrc & SCB_VTOR_TBLOFF_Msk);
+
+         /* Initialize the C library */
+-        __libc_init_array();
++        // __libc_init_array();
+
+         /* Branch to main function */
+         main();
+diff --git a/lib/cmsis-sam4e/include/component/afec.h b/lib/cmsis-sam4e/include/component/afec.h
+index 34c4e61d..9a4f8f96 100644
+--- a/lib/cmsis-sam4e/include/component/afec.h
++++ b/lib/cmsis-sam4e/include/component/afec.h
+@@ -59,9 +59,9 @@ typedef struct {
+   RoReg Reserved2[1];
+   RwReg AFE_CDOR;      /**< \brief (Afec Offset: 0x5C) Channel DC Offset Register */
+   RwReg AFE_DIFFR;     /**< \brief (Afec Offset: 0x60) Channel Differential Register */
+-  RoReg AFE_CSELR;     /**< \brief (Afec Offset: 0x64) Channel Register Selection */
++  RwReg AFE_CSELR;     /**< \brief (Afec Offset: 0x64) Channel Register Selection */
+   RoReg AFE_CDR;       /**< \brief (Afec Offset: 0x68) Channel Data Register */
+-  RoReg AFE_COCR;      /**< \brief (Afec Offset: 0x6C) Channel Offset Compensation Register */
++  RwReg AFE_COCR;      /**< \brief (Afec Offset: 0x6C) Channel Offset Compensation Register */
+   RwReg AFE_TEMPMR;    /**< \brief (Afec Offset: 0x70) Temperature Sensor Mode Register */
+   RwReg AFE_TEMPCWR;   /**< \brief (Afec Offset: 0x74) Temperature Compare Window Register */
+   RoReg Reserved3[7];
+
diff --git a/lib/cmsis-sam4e/gcc/gcc/startup_sam4e.c b/lib/cmsis-sam4e/gcc/gcc/startup_sam4e.c
index fa6b305b..78402954 100644
--- a/lib/cmsis-sam4e/gcc/gcc/startup_sam4e.c
+++ b/lib/cmsis-sam4e/gcc/gcc/startup_sam4e.c
@@ -104,7 +104,7 @@ void GMAC_Handler   ( void ) __attribute__ ((weak, alias("Dummy_Handler")));
 void UART1_Handler  ( void ) __attribute__ ((weak, alias("Dummy_Handler")));
 
 /* Exception Table */
-__attribute__ ((section(".vectors")))
+__attribute__ ((section(".vectors"))) __attribute__((externally_visible))
 const DeviceVectors exception_table = {
 
         /* Configure Initial Stack Pointer, using linker-generated symbols */
@@ -135,6 +135,7 @@ const DeviceVectors exception_table = {
         (void*) PMC_Handler,    /* 5  Power Management Controller */
         (void*) EFC_Handler,    /* 6  Enhanced Embedded Flash Controller */
         (void*) UART0_Handler,  /* 7  UART 0 */
+        (void*) Dummy_Handler,  /* 8  Dummy */
         (void*) PIOA_Handler,   /* 9  Parallel I/O Controller A */
         (void*) PIOB_Handler,   /* 10 Parallel I/O Controller B */
         (void*) PIOC_Handler,   /* 11 Parallel I/O Controller C */
@@ -166,6 +167,10 @@ const DeviceVectors exception_table = {
         (void*) CAN0_Handler,   /* 37 CAN0 */
         (void*) CAN1_Handler,   /* 38 CAN1 */
         (void*) AES_Handler,    /* 39 AES */
+        (void*) Dummy_Handler,  /* 40 Dummy */
+        (void*) Dummy_Handler,  /* 41 Dummy */
+        (void*) Dummy_Handler,  /* 42 Dummy */
+        (void*) Dummy_Handler,  /* 43 Dummy */
         (void*) GMAC_Handler,   /* 44 EMAC */
         (void*) UART1_Handler   /* 45 UART */
 };
@@ -198,7 +203,7 @@ void Reset_Handler(void)
         SCB->VTOR = ((uint32_t) pSrc & SCB_VTOR_TBLOFF_Msk);
 
         /* Initialize the C library */
-        __libc_init_array();
+        // __libc_init_array();
 
         /* Branch to main function */
         main();
diff --git a/lib/cmsis-sam4e/include/component/afec.h b/lib/cmsis-sam4e/include/component/afec.h
index 34c4e61d..9a4f8f96 100644
--- a/lib/cmsis-sam4e/include/component/afec.h
+++ b/lib/cmsis-sam4e/include/component/afec.h
@@ -59,9 +59,9 @@ typedef struct {
   RoReg Reserved2[1];
   RwReg AFE_CDOR;      /**< \brief (Afec Offset: 0x5C) Channel DC Offset Register */
   RwReg AFE_DIFFR;     /**< \brief (Afec Offset: 0x60) Channel Differential Register */
-  RoReg AFE_CSELR;     /**< \brief (Afec Offset: 0x64) Channel Register Selection */
+  RwReg AFE_CSELR;     /**< \brief (Afec Offset: 0x64) Channel Register Selection */
   RoReg AFE_CDR;       /**< \brief (Afec Offset: 0x68) Channel Data Register */
-  RoReg AFE_COCR;      /**< \brief (Afec Offset: 0x6C) Channel Offset Compensation Register */
+  RwReg AFE_COCR;      /**< \brief (Afec Offset: 0x6C) Channel Offset Compensation Register */
   RwReg AFE_TEMPMR;    /**< \brief (Afec Offset: 0x70) Temperature Sensor Mode Register */
   RwReg AFE_TEMPCWR;   /**< \brief (Afec Offset: 0x74) Temperature Compare Window Register */
   RoReg Reserved3[7];